Refactor some Sponge service details

bukkit/src/main/java/me/lucko/luckperms/bukkit/BukkitSenderFactory.java

@@ -37,8 +37,9 @@ import me.lucko.luckperms.common.utils.TextUtils;
 import net.kyori.text.Component;
 import net.kyori.text.serializer.ComponentSerializers;
 
-import org.bukkit.command.BlockCommandSender;
 import org.bukkit.command.CommandSender;
+import org.bukkit.command.ConsoleCommandSender;
+import org.bukkit.command.RemoteConsoleCommandSender;
 import org.bukkit.entity.Player;
 
 import java.util.UUID;
@@ -71,13 +72,14 @@ public class BukkitSenderFactory extends SenderFactory<CommandSender> {
 
     @Override
     protected void sendMessage(CommandSender sender, String s) {
-        // send sync if command block
+        // we can safely send async for players and the console
-        if (sender instanceof BlockCommandSender) {
+        if (sender instanceof Player || sender instanceof ConsoleCommandSender || sender instanceof RemoteConsoleCommandSender) {
-            getPlugin().getScheduler().doSync(new BlockMessengerAgent(((BlockCommandSender) sender), s));
+            sender.sendMessage(s);
             return;
         }
 
-        sender.sendMessage(s);
+        // otherwise, send the message sync
+        getPlugin().getScheduler().doSync(new SyncMessengerAgent(sender, s));
     }
 
     @Override
@@ -123,18 +125,18 @@ public class BukkitSenderFactory extends SenderFactory<CommandSender> {
         }
     }
 
-    private static final class BlockMessengerAgent implements Runnable {
+    private static final class SyncMessengerAgent implements Runnable {
-        private final BlockCommandSender block;
+        private final CommandSender sender;
         private final String message;
 
-        private BlockMessengerAgent(BlockCommandSender block, String message) {
+        private SyncMessengerAgent(CommandSender sender, String message) {
-            this.block = block;
+            this.sender = sender;
             this.message = message;
         }
 
         @Override
         public void run() {
-            this.block.sendMessage(this.message);
+            this.sender.sendMessage(this.message);
         }
     }
 

bukkit/src/main/java/me/lucko/luckperms/bukkit/migration/BukkitMigrationUtils.java

@@ -25,8 +25,8 @@
 
 package me.lucko.luckperms.bukkit.migration;
 
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.logging.ProgressLogger;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import org.bukkit.Bukkit;
 
@@ -36,7 +36,7 @@ public final class BukkitMigrationUtils {
 
     @SuppressWarnings("deprecation")
     public static UUID lookupUuid(ProgressLogger log, String s) {
-        UUID uuid = CommandUtils.parseUuid(s);
+        UUID uuid = Uuids.parseNullable(s);
         if (uuid == null) {
             try {
                 uuid = Bukkit.getOfflinePlayer(s).getUniqueId();

common/src/main/java/me/lucko/luckperms/common/commands/impl/log/LogRecent.java

@@ -31,7 +31,6 @@ import me.lucko.luckperms.common.commands.CommandPermission;
 import me.lucko.luckperms.common.commands.CommandResult;
 import me.lucko.luckperms.common.commands.abstraction.SubCommand;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.config.ConfigKeys;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
@@ -40,6 +39,7 @@ import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.storage.DataConstraints;
 import me.lucko.luckperms.common.utils.DateUtil;
 import me.lucko.luckperms.common.utils.Predicates;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import java.util.List;
 import java.util.Map;
@@ -72,7 +72,7 @@ public class LogRecent extends SubCommand<Log> {
 
         // User and possibly page
         final String target = args.get(0);
-        UUID uuid = CommandUtils.parseUuid(target.toLowerCase());
+        UUID uuid = Uuids.parseNullable(target);
         if (uuid == null) {
             if (!plugin.getConfiguration().get(ConfigKeys.ALLOW_INVALID_USERNAMES)) {
                 if (!DataConstraints.PLAYER_USERNAME_TEST.test(target)) {

common/src/main/java/me/lucko/luckperms/common/commands/impl/log/LogUserHistory.java

@@ -31,7 +31,6 @@ import me.lucko.luckperms.common.commands.CommandPermission;
 import me.lucko.luckperms.common.commands.CommandResult;
 import me.lucko.luckperms.common.commands.abstraction.SubCommand;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.config.ConfigKeys;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
@@ -40,6 +39,7 @@ import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.storage.DataConstraints;
 import me.lucko.luckperms.common.utils.DateUtil;
 import me.lucko.luckperms.common.utils.Predicates;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import java.util.List;
 import java.util.Map;
@@ -67,7 +67,7 @@ public class LogUserHistory extends SubCommand<Log> {
             }
         }
 
-        UUID uuid = CommandUtils.parseUuid(target.toLowerCase());
+        UUID uuid = Uuids.parseNullable(target);
         if (uuid == null) {
             if (!plugin.getConfiguration().get(ConfigKeys.ALLOW_INVALID_USERNAMES)) {
                 if (!DataConstraints.PLAYER_USERNAME_TEST.test(target)) {

common/src/main/java/me/lucko/luckperms/common/commands/impl/misc/CheckCommand.java

@@ -38,6 +38,7 @@ import me.lucko.luckperms.common.locale.Message;
 import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.utils.Predicates;
+import me.lucko.luckperms.common.utils.Uuids;
 import me.lucko.luckperms.common.verbose.CheckOrigin;
 
 import java.util.List;
@@ -55,7 +56,7 @@ public class CheckCommand extends SingleCommand {
         String permission = args.get(1);
 
         User user;
-        UUID u = CommandUtils.parseUuid(target);
+        UUID u = Uuids.parseNullable(target);
         if (u != null) {
             user = plugin.getUserManager().getIfLoaded(u);
         } else {

common/src/main/java/me/lucko/luckperms/common/commands/impl/misc/TreeCommand.java

@@ -31,7 +31,6 @@ import me.lucko.luckperms.common.commands.CommandResult;
 import me.lucko.luckperms.common.commands.abstraction.SingleCommand;
 import me.lucko.luckperms.common.commands.sender.Sender;
 import me.lucko.luckperms.common.commands.utils.ArgumentUtils;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
 import me.lucko.luckperms.common.locale.Message;
@@ -40,6 +39,7 @@ import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.treeview.TreeView;
 import me.lucko.luckperms.common.treeview.TreeViewBuilder;
 import me.lucko.luckperms.common.utils.Predicates;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import net.kyori.text.Component;
 import net.kyori.text.TextComponent;
@@ -73,7 +73,7 @@ public class TreeCommand extends SingleCommand {
 
         if (player != null) {
             User user;
-            UUID u = CommandUtils.parseUuid(player);
+            UUID u = Uuids.parseNullable(player);
             if (u != null) {
                 user = plugin.getUserManager().getIfLoaded(u);
             } else {

common/src/main/java/me/lucko/luckperms/common/commands/impl/user/UserClone.java

@@ -31,7 +31,6 @@ import me.lucko.luckperms.common.commands.CommandPermission;
 import me.lucko.luckperms.common.commands.CommandResult;
 import me.lucko.luckperms.common.commands.abstraction.SubCommand;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.config.ConfigKeys;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
@@ -40,6 +39,7 @@ import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.storage.DataConstraints;
 import me.lucko.luckperms.common.utils.Predicates;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import java.util.List;
 import java.util.UUID;
@@ -58,7 +58,7 @@ public class UserClone extends SubCommand<User> {
 
         String target = args.get(0);
 
-        UUID uuid = CommandUtils.parseUuid(target.toLowerCase());
+        UUID uuid = Uuids.parseNullable(target);
         if (uuid == null) {
             if (!plugin.getConfiguration().get(ConfigKeys.ALLOW_INVALID_USERNAMES)) {
                 if (!DataConstraints.PLAYER_USERNAME_TEST.test(target)) {

common/src/main/java/me/lucko/luckperms/common/commands/impl/user/UserMainCommand.java

@@ -38,7 +38,6 @@ import me.lucko.luckperms.common.commands.impl.generic.other.HolderShowTracks;
 import me.lucko.luckperms.common.commands.impl.generic.parent.CommandParent;
 import me.lucko.luckperms.common.commands.impl.generic.permission.CommandPermission;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.config.ConfigKeys;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
@@ -47,6 +46,7 @@ import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.references.UserIdentifier;
 import me.lucko.luckperms.common.storage.DataConstraints;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import java.util.List;
 import java.util.UUID;
@@ -83,7 +83,7 @@ public class UserMainCommand extends MainCommand<User, UserIdentifier> {
 
     @Override
     protected UserIdentifier parseTarget(String target, LuckPermsPlugin plugin, Sender sender) {
-        UUID uuid = CommandUtils.parseUuid(target.toLowerCase());
+        UUID uuid = Uuids.parseNullable(target);
         if (uuid == null) {
             if (!plugin.getConfiguration().get(ConfigKeys.ALLOW_INVALID_USERNAMES)) {
                 if (!DataConstraints.PLAYER_USERNAME_TEST.test(target)) {

common/src/main/java/me/lucko/luckperms/common/commands/utils/CommandUtils.java

@@ -37,7 +37,6 @@ import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.UUID;
 import java.util.function.Supplier;
 import java.util.regex.Pattern;
 
@@ -108,18 +107,6 @@ public final class CommandUtils {
         return lists;
     }
 
-    public static UUID parseUuid(String s) {
-        try {
-            return UUID.fromString(s);
-        } catch (IllegalArgumentException e) {
-            try {
-                return UUID.fromString(s.replaceAll("(\\w{8})(\\w{4})(\\w{4})(\\w{4})(\\w{12})", "$1-$2-$3-$4-$5"));
-            } catch (IllegalArgumentException e1) {
-                return null;
-            }
-        }
-    }
-
     public static String toCommaSep(Collection<String> strings) {
         if (strings.isEmpty()) {
             return "&bNone";

common/src/main/java/me/lucko/luckperms/common/storage/dao/file/ConfigurateDao.java

@@ -35,7 +35,6 @@ import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.common.actionlog.Log;
 import me.lucko.luckperms.common.bulkupdate.BulkUpdate;
 import me.lucko.luckperms.common.commands.CommandManager;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.contexts.ContextSetConfigurateSerializer;
 import me.lucko.luckperms.common.managers.group.GroupManager;
 import me.lucko.luckperms.common.managers.track.TrackManager;
@@ -51,6 +50,7 @@ import me.lucko.luckperms.common.storage.dao.AbstractDao;
 import me.lucko.luckperms.common.storage.dao.legacy.LegacyJsonMigration;
 import me.lucko.luckperms.common.storage.dao.legacy.LegacyYamlMigration;
 import me.lucko.luckperms.common.utils.ImmutableCollectors;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import ninja.leaping.configurate.ConfigurationNode;
 import ninja.leaping.configurate.SimpleConfigurationNode;
@@ -266,7 +266,7 @@ public abstract class ConfigurateDao extends AbstractDao {
                 }
 
                 String user = s.substring(0, s.length() - this.fileExtension.length());
-                UUID uuid = CommandUtils.parseUuid(user);
+                UUID uuid = Uuids.parseNullable(user);
                 if (uuid == null) {
                     return;
                 }

common/src/main/java/me/lucko/luckperms/common/utils/Uuids.java

@@ -0,0 +1,67 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package me.lucko.luckperms.common.utils;
+
+import java.util.Optional;
+import java.util.UUID;
+import java.util.function.Predicate;
+import java.util.regex.Pattern;
+
+import javax.annotation.Nullable;
+
+/**
+ * Utilities for working with {@link UUID}s.
+ */
+public final class Uuids {
+    private static final Pattern UUID_PATTERN = Pattern.compile("(\\w{8})(\\w{4})(\\w{4})(\\w{4})(\\w{12})");
+
+    public static final Predicate<String> PREDICATE = s -> parseNullable(s) != null;
+
+    @Nullable
+    private static UUID fromString(String s) {
+        try {
+            return UUID.fromString(s);
+        } catch (IllegalArgumentException e) {
+            return null;
+        }
+    }
+
+    @Nullable
+    public static UUID parseNullable(String s) {
+        UUID uuid = fromString(s);
+        if (uuid == null) {
+            uuid = fromString(UUID_PATTERN.matcher(s).replaceAll("$1-$2-$3-$4-$5"));
+        }
+        return uuid;
+    }
+
+    public static Optional<UUID> parse(String s) {
+        return Optional.ofNullable(parseNullable(s));
+    }
+
+    private Uuids() {}
+
+}

common/src/main/java/me/lucko/luckperms/common/webeditor/WebEditorUtils.java

@@ -33,7 +33,6 @@ import com.google.gson.stream.JsonWriter;
 
 import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.contexts.ContextSetJsonSerializer;
 import me.lucko.luckperms.common.locale.Message;
 import me.lucko.luckperms.common.model.Group;
@@ -41,6 +40,7 @@ import me.lucko.luckperms.common.model.PermissionHolder;
 import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.node.NodeModel;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
+import me.lucko.luckperms.common.utils.Uuids;
 
 import java.io.BufferedReader;
 import java.io.InputStream;
@@ -86,7 +86,7 @@ public final class WebEditorUtils {
             return holder;
         } else if (who.startsWith(USER_ID_PATTERN)) {
             String user = who.substring(USER_ID_PATTERN.length());
-            UUID uuid = CommandUtils.parseUuid(user);
+            UUID uuid = Uuids.parseNullable(user);
             if (uuid == null) {
                 Message.APPLY_EDITS_TARGET_USER_NOT_UUID.send(sender, user);
                 return null;

sponge/sponge-service-api6/src/main/java/me/lucko/luckperms/sponge/service/proxy/api6/LPDescriptionBuilder.java

@@ -42,15 +42,16 @@ import java.util.Map;
 import java.util.Objects;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
-public final class SimpleDescriptionBuilder implements PermissionDescription.Builder {
+public final class LPDescriptionBuilder implements PermissionDescription.Builder {
     @Nonnull private final LPPermissionService service;
     @Nonnull private final PluginContainer container;
     @Nonnull private final Map<String, Tristate> roles = new HashMap<>();
-    private String id = null;
+    @Nullable private String id = null;
-    private Text description = null;
+    @Nullable private Text description = null;
 
-    public SimpleDescriptionBuilder(@Nonnull LPPermissionService service, @Nonnull PluginContainer container) {
+    public LPDescriptionBuilder(@Nonnull LPPermissionService service, @Nonnull PluginContainer container) {
         this.service = Objects.requireNonNull(service, "service");
         this.container = Objects.requireNonNull(container, "container");
     }
@@ -84,7 +85,7 @@ public final class SimpleDescriptionBuilder implements PermissionDescription.Bui
             throw new IllegalStateException("id cannot be null");
         }
 
-        LPPermissionDescription d = this.service.registerPermissionDescription(this.id, this.description, this.container);
+        LPPermissionDescription description = this.service.registerPermissionDescription(this.id, this.description, this.container);
 
         // Set role-templates
         LPSubjectCollection subjects = this.service.getCollection(PermissionService.SUBJECTS_ROLE_TEMPLATE);
@@ -100,14 +101,14 @@ public final class SimpleDescriptionBuilder implements PermissionDescription.Bui
         this.id = null;
         this.description = null;
 
-        return d.sponge();
+        return description.sponge();
     }
 
     @Override
     public boolean equals(Object o) {
         if (o == this) return true;
-        if (!(o instanceof SimpleDescriptionBuilder)) return false;
+        if (!(o instanceof LPDescriptionBuilder)) return false;
-        final SimpleDescriptionBuilder other = (SimpleDescriptionBuilder) o;
+        final LPDescriptionBuilder other = (LPDescriptionBuilder) o;
 
         return this.container.equals(other.container) &&
                 this.roles.equals(other.roles) &&

sponge/sponge-service-api6/src/main/java/me/lucko/luckperms/sponge/service/proxy/api6/PermissionServiceProxy.java

@@ -91,7 +91,7 @@ public final class PermissionServiceProxy implements PermissionService {
             throw new IllegalArgumentException("Couldn't find a plugin container for " + o.getClass().getSimpleName());
         }
 
-        return Optional.of(new SimpleDescriptionBuilder(this.handle, container.get()));
+        return Optional.of(new LPDescriptionBuilder(this.handle, container.get()));
     }
 
     @Nonnull

sponge/sponge-service-api6/src/main/java/me/lucko/luckperms/sponge/service/proxy/api6/SubjectCollectionProxy.java

@@ -30,7 +30,7 @@ import me.lucko.luckperms.sponge.service.CompatibilityUtil;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.service.permission.Subject;

sponge/sponge-service-api6/src/main/java/me/lucko/luckperms/sponge/service/proxy/api6/SubjectDataProxy.java

@@ -30,8 +30,8 @@ import me.lucko.luckperms.sponge.service.CompatibilityUtil;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectData;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.service.permission.Subject;
@@ -48,17 +48,19 @@ import javax.annotation.Nonnull;
 @SuppressWarnings("unchecked")
 public final class SubjectDataProxy implements SubjectData {
     private final LPPermissionService service;
-    private final SubjectReference ref;
+    private final LPSubjectReference ref;
     private final boolean enduring;
 
-    public SubjectDataProxy(LPPermissionService service, SubjectReference ref, boolean enduring) {
+    public SubjectDataProxy(LPPermissionService service, LPSubjectReference ref, boolean enduring) {
         this.service = service;
         this.ref = ref;
         this.enduring = enduring;
     }
 
     private CompletableFuture<LPSubjectData> handle() {
-        return this.enduring ? this.ref.resolveLp().thenApply(LPSubject::getSubjectData) : this.ref.resolveLp().thenApply(LPSubject::getTransientSubjectData);
+        return this.enduring ?
+                this.ref.resolveLp().thenApply(LPSubject::getSubjectData) :
+                this.ref.resolveLp().thenApply(LPSubject::getTransientSubjectData);
     }
 
     @Nonnull

sponge/sponge-service-api6/src/main/java/me/lucko/luckperms/sponge/service/proxy/api6/SubjectProxy.java

@@ -31,8 +31,8 @@ import me.lucko.luckperms.sponge.service.CompatibilityUtil;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.ProxiedSubject;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.command.CommandSource;
 import org.spongepowered.api.service.context.Context;
@@ -51,9 +51,9 @@ import javax.annotation.Nonnull;
 @SuppressWarnings("unchecked")
 public final class SubjectProxy implements Subject, ProxiedSubject {
     private final LPPermissionService service;
-    private final SubjectReference ref;
+    private final LPSubjectReference ref;
 
-    public SubjectProxy(LPPermissionService service, SubjectReference ref) {
+    public SubjectProxy(LPPermissionService service, LPSubjectReference ref) {
         this.service = service;
         this.ref = ref;
     }
@@ -62,8 +62,9 @@ public final class SubjectProxy implements Subject, ProxiedSubject {
         return this.ref.resolveLp();
     }
 
+    @Nonnull
     @Override
-    public SubjectReference getReference() {
+    public LPSubjectReference asSubjectReference() {
         return this.ref;
     }
 
@@ -157,7 +158,7 @@ public final class SubjectProxy implements Subject, ProxiedSubject {
     @Nonnull
     @Override
     public Set<Context> getActiveContexts() {
-        return handle().thenApply(handle -> CompatibilityUtil.convertContexts(handle.getActiveContextSet())).join();
+        return CompatibilityUtil.convertContexts(this.service.getPlugin().getContextManager().getApplicableContext(this));
     }
 
     @Override

sponge/sponge-service-api7/src/main/java/me/lucko/luckperms/sponge/service/proxy/api7/LPDescriptionBuilder.java

@@ -42,15 +42,16 @@ import java.util.Map;
 import java.util.Objects;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
-public final class SimpleDescriptionBuilder implements PermissionDescription.Builder {
+public final class LPDescriptionBuilder implements PermissionDescription.Builder {
     @Nonnull private final LPPermissionService service;
     @Nonnull private final PluginContainer container;
     @Nonnull private final Map<String, Tristate> roles = new HashMap<>();
-    private String id = null;
+    @Nullable private String id = null;
-    private Text description = null;
+    @Nullable private Text description = null;
 
-    public SimpleDescriptionBuilder(LPPermissionService service, PluginContainer container) {
+    public LPDescriptionBuilder(LPPermissionService service, PluginContainer container) {
         this.service = Objects.requireNonNull(service, "service");
         this.container = Objects.requireNonNull(container, "container");
     }
@@ -64,8 +65,8 @@ public final class SimpleDescriptionBuilder implements PermissionDescription.Bui
 
     @Nonnull
     @Override
-    public PermissionDescription.Builder description(Text description) {
+    public PermissionDescription.Builder description(@Nullable Text description) {
-        this.description = Objects.requireNonNull(description, "description");
+        this.description = description;
         return this;
     }
 
@@ -84,7 +85,7 @@ public final class SimpleDescriptionBuilder implements PermissionDescription.Bui
             throw new IllegalStateException("id cannot be null");
         }
 
-        LPPermissionDescription d = this.service.registerPermissionDescription(this.id, this.description, this.container);
+        LPPermissionDescription description = this.service.registerPermissionDescription(this.id, this.description, this.container);
 
         // Set role-templates
         LPSubjectCollection subjects = this.service.getCollection(PermissionService.SUBJECTS_ROLE_TEMPLATE);
@@ -100,14 +101,14 @@ public final class SimpleDescriptionBuilder implements PermissionDescription.Bui
         this.id = null;
         this.description = null;
 
-        return d.sponge();
+        return description.sponge();
     }
 
     @Override
     public boolean equals(Object o) {
         if (o == this) return true;
-        if (!(o instanceof SimpleDescriptionBuilder)) return false;
+        if (!(o instanceof LPDescriptionBuilder)) return false;
-        final SimpleDescriptionBuilder other = (SimpleDescriptionBuilder) o;
+        final LPDescriptionBuilder other = (LPDescriptionBuilder) o;
 
         return this.container.equals(other.container) &&
                 this.roles.equals(other.roles) &&

sponge/sponge-service-api7/src/main/java/me/lucko/luckperms/sponge/service/proxy/api7/PermissionServiceProxy.java

@@ -31,7 +31,7 @@ import me.lucko.luckperms.common.utils.ImmutableCollectors;
 import me.lucko.luckperms.sponge.service.model.LPPermissionDescription;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.Sponge;
 import org.spongepowered.api.plugin.PluginContainer;
@@ -44,6 +44,7 @@ import org.spongepowered.api.service.permission.SubjectReference;
 
 import java.util.Collection;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
@@ -115,8 +116,20 @@ public final class PermissionServiceProxy implements PermissionService {
 
     @Nonnull
     @Override
-    public SubjectReference newSubjectReference(@Nonnull String s, @Nonnull String s1) {
+    public SubjectReference newSubjectReference(@Nonnull String collectionIdentifier, @Nonnull String subjectIdentifier) {
-        return SubjectReferenceFactory.obtain(this.handle, s, s1);
+        Objects.requireNonNull(collectionIdentifier, "collectionIdentifier");
+        Objects.requireNonNull(subjectIdentifier, "subjectIdentifier");
+
+        // test the identifiers
+        String collection = collectionIdentifier.toLowerCase();
+        if (collection.equals("user") && !this.handle.getUserSubjects().getIdentifierValidityPredicate().test(subjectIdentifier)) {
+            throw new IllegalArgumentException("Subject identifier '" + subjectIdentifier + "' does not pass the validity predicate for the user subject collection");
+        } else if (collection.equals("group") && !this.handle.getGroupSubjects().getIdentifierValidityPredicate().test(subjectIdentifier)) {
+            throw new IllegalArgumentException("Subject identifier '" + subjectIdentifier + "' does not pass the validity predicate for the group subject collection");
+        }
+
+        // obtain a reference
+        return SubjectReferenceFactory.obtain(this.handle, collectionIdentifier, subjectIdentifier);
     }
 
     @Override
@@ -126,7 +139,7 @@ public final class PermissionServiceProxy implements PermissionService {
             throw new IllegalArgumentException("Couldn't find a plugin container for " + o.getClass().getSimpleName());
         }
 
-        return new SimpleDescriptionBuilder(this.handle, container.get());
+        return new LPDescriptionBuilder(this.handle, container.get());
     }
 
     @Nonnull

sponge/sponge-service-api7/src/main/java/me/lucko/luckperms/sponge/service/proxy/api7/SubjectCollectionProxy.java

@@ -29,7 +29,7 @@ import me.lucko.luckperms.common.utils.ImmutableCollectors;
 import me.lucko.luckperms.sponge.service.CompatibilityUtil;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.service.permission.Subject;
@@ -38,6 +38,7 @@ import org.spongepowered.api.service.permission.SubjectReference;
 
 import java.util.Collection;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
@@ -103,8 +104,13 @@ public final class SubjectCollectionProxy implements SubjectCollection {
 
     @Nonnull
     @Override
-    public SubjectReference newSubjectReference(@Nonnull String s) {
+    public SubjectReference newSubjectReference(@Nonnull String subjectIdentifier) {
-        return SubjectReferenceFactory.obtain(this.handle.getService(), getIdentifier(), s);
+        Objects.requireNonNull(subjectIdentifier, "identifier");
+        if (!this.handle.getIdentifierValidityPredicate().test(subjectIdentifier)) {
+            throw new IllegalArgumentException("Subject identifier '" + subjectIdentifier + "' does not pass the validity predicate");
+        }
+
+        return SubjectReferenceFactory.obtain(this.handle.getService(), getIdentifier(), subjectIdentifier);
     }
 
     @Nonnull

sponge/sponge-service-api7/src/main/java/me/lucko/luckperms/sponge/service/proxy/api7/SubjectDataProxy.java

@@ -30,8 +30,8 @@ import me.lucko.luckperms.sponge.service.CompatibilityUtil;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectData;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.service.permission.SubjectData;
@@ -48,17 +48,19 @@ import javax.annotation.Nullable;
 @SuppressWarnings("unchecked")
 public final class SubjectDataProxy implements SubjectData {
     private final LPPermissionService service;
-    private final SubjectReference ref;
+    private final LPSubjectReference ref;
     private final boolean enduring;
 
-    public SubjectDataProxy(LPPermissionService service, SubjectReference ref, boolean enduring) {
+    public SubjectDataProxy(LPPermissionService service, LPSubjectReference ref, boolean enduring) {
         this.service = service;
         this.ref = ref;
         this.enduring = enduring;
     }
 
     private CompletableFuture<LPSubjectData> handle() {
-        return this.enduring ? this.ref.resolveLp().thenApply(LPSubject::getSubjectData) : this.ref.resolveLp().thenApply(LPSubject::getTransientSubjectData);
+        return this.enduring ?
+                this.ref.resolveLp().thenApply(LPSubject::getSubjectData) :
+                this.ref.resolveLp().thenApply(LPSubject::getTransientSubjectData);
     }
 
     @Nonnull

sponge/sponge-service-api7/src/main/java/me/lucko/luckperms/sponge/service/proxy/api7/SubjectProxy.java

@@ -30,14 +30,15 @@ import me.lucko.luckperms.sponge.service.CompatibilityUtil;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.ProxiedSubject;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.command.CommandSource;
 import org.spongepowered.api.service.context.Context;
 import org.spongepowered.api.service.permission.Subject;
 import org.spongepowered.api.service.permission.SubjectCollection;
 import org.spongepowered.api.service.permission.SubjectData;
+import org.spongepowered.api.service.permission.SubjectReference;
 import org.spongepowered.api.util.Tristate;
 
 import java.util.List;
@@ -50,26 +51,27 @@ import javax.annotation.Nonnull;
 @SuppressWarnings("unchecked")
 public final class SubjectProxy implements Subject, ProxiedSubject {
     private final LPPermissionService service;
-    private final SubjectReference ref;
+    private final LPSubjectReference ref;
 
-    public SubjectProxy(LPPermissionService service, SubjectReference ref) {
+    public SubjectProxy(LPPermissionService service, LPSubjectReference ref) {
         this.service = service;
         this.ref = ref;
     }
 
-    private CompletableFuture<LPSubject> getHandle() {
+    private CompletableFuture<LPSubject> handle() {
         return this.ref.resolveLp();
     }
 
+    @Nonnull
     @Override
-    public SubjectReference getReference() {
+    public LPSubjectReference asSubjectReference() {
         return this.ref;
     }
 
     @Nonnull
     @Override
     public Optional<CommandSource> getCommandSource() {
-        return getHandle().thenApply(LPSubject::getCommandSource).join();
+        return handle().thenApply(LPSubject::getCommandSource).join();
     }
 
     @Nonnull
@@ -78,12 +80,6 @@ public final class SubjectProxy implements Subject, ProxiedSubject {
         return this.service.getCollection(this.ref.getCollectionIdentifier()).sponge();
     }
 
-    @Nonnull
-    @Override
-    public org.spongepowered.api.service.permission.SubjectReference asSubjectReference() {
-        return this.ref;
-    }
-
     @Override
     public boolean isSubjectDataPersisted() {
         return true;
@@ -101,52 +97,52 @@ public final class SubjectProxy implements Subject, ProxiedSubject {
 
     @Override
     public boolean hasPermission(@Nonnull Set<Context> contexts, @Nonnull String permission) {
-        return getHandle().thenApply(handle -> handle.getPermissionValue(CompatibilityUtil.convertContexts(contexts), permission).asBoolean()).join();
+        return handle().thenApply(handle -> handle.getPermissionValue(CompatibilityUtil.convertContexts(contexts), permission).asBoolean()).join();
     }
 
     @Override
     public boolean hasPermission(@Nonnull String permission) {
-        return getHandle().thenApply(handle -> handle.getPermissionValue(ImmutableContextSet.empty(), permission).asBoolean()).join();
+        return handle().thenApply(handle -> handle.getPermissionValue(ImmutableContextSet.empty(), permission).asBoolean()).join();
     }
 
     @Nonnull
     @Override
     public Tristate getPermissionValue(@Nonnull Set<Context> contexts, @Nonnull String permission) {
-        return getHandle().thenApply(handle -> CompatibilityUtil.convertTristate(handle.getPermissionValue(CompatibilityUtil.convertContexts(contexts), permission))).join();
+        return handle().thenApply(handle -> CompatibilityUtil.convertTristate(handle.getPermissionValue(CompatibilityUtil.convertContexts(contexts), permission))).join();
     }
 
     @Override
-    public boolean isChildOf(@Nonnull org.spongepowered.api.service.permission.SubjectReference parent) {
+    public boolean isChildOf(@Nonnull SubjectReference parent) {
-        return getHandle().thenApply(handle -> handle.isChildOf(ImmutableContextSet.empty(), SubjectReferenceFactory.obtain(this.service, parent))).join();
+        return handle().thenApply(handle -> handle.isChildOf(ImmutableContextSet.empty(), SubjectReferenceFactory.obtain(this.service, parent))).join();
     }
 
     @Override
-    public boolean isChildOf(@Nonnull Set<Context> contexts, @Nonnull org.spongepowered.api.service.permission.SubjectReference parent) {
+    public boolean isChildOf(@Nonnull Set<Context> contexts, @Nonnull SubjectReference parent) {
-        return getHandle().thenApply(handle -> handle.isChildOf(CompatibilityUtil.convertContexts(contexts), SubjectReferenceFactory.obtain(this.service, parent))).join();
+        return handle().thenApply(handle -> handle.isChildOf(CompatibilityUtil.convertContexts(contexts), SubjectReferenceFactory.obtain(this.service, parent))).join();
     }
 
     @Nonnull
     @Override
-    public List<org.spongepowered.api.service.permission.SubjectReference> getParents() {
+    public List<SubjectReference> getParents() {
-        return (List) getHandle().thenApply(handle -> handle.getParents(ImmutableContextSet.empty())).join();
+        return (List) handle().thenApply(handle -> handle.getParents(ImmutableContextSet.empty())).join();
     }
 
     @Nonnull
     @Override
-    public List<org.spongepowered.api.service.permission.SubjectReference> getParents(@Nonnull Set<Context> contexts) {
+    public List<SubjectReference> getParents(@Nonnull Set<Context> contexts) {
-        return (List) getHandle().thenApply(handle -> handle.getParents(CompatibilityUtil.convertContexts(contexts))).join();
+        return (List) handle().thenApply(handle -> handle.getParents(CompatibilityUtil.convertContexts(contexts))).join();
     }
 
     @Nonnull
     @Override
     public Optional<String> getOption(@Nonnull Set<Context> contexts, @Nonnull String key) {
-        return getHandle().thenApply(handle -> handle.getOption(CompatibilityUtil.convertContexts(contexts), key)).join();
+        return handle().thenApply(handle -> handle.getOption(CompatibilityUtil.convertContexts(contexts), key)).join();
     }
 
     @Nonnull
     @Override
     public Optional<String> getOption(@Nonnull String key) {
-        return getHandle().thenApply(handle -> handle.getOption(ImmutableContextSet.empty(), key)).join();
+        return handle().thenApply(handle -> handle.getOption(ImmutableContextSet.empty(), key)).join();
     }
 
     @Override
@@ -157,13 +153,13 @@ public final class SubjectProxy implements Subject, ProxiedSubject {
     @Nonnull
     @Override
     public Optional<String> getFriendlyIdentifier() {
-        return getHandle().thenApply(LPSubject::getFriendlyIdentifier).join();
+        return handle().thenApply(LPSubject::getFriendlyIdentifier).join();
     }
 
     @Nonnull
     @Override
     public Set<Context> getActiveContexts() {
-        return getHandle().thenApply(handle -> CompatibilityUtil.convertContexts(handle.getActiveContextSet())).join();
+        return CompatibilityUtil.convertContexts(this.service.getPlugin().getContextManager().getApplicableContext(this));
     }
 
     @Override

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/LPPermissionDescription.java

@@ -25,6 +25,8 @@
 
 package me.lucko.luckperms.sponge.service.model;
 
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
+
 import org.spongepowered.api.plugin.PluginContainer;
 import org.spongepowered.api.service.permission.PermissionDescription;
 import org.spongepowered.api.text.Text;
@@ -48,7 +50,7 @@ public interface LPPermissionDescription {
 
     Optional<PluginContainer> getOwner();
 
-    CompletableFuture<Map<SubjectReference, Boolean>> findAssignedSubjects(String collectionIdentifier);
+    CompletableFuture<Map<LPSubjectReference, Boolean>> findAssignedSubjects(String collectionIdentifier);
 
     Map<LPSubject, Boolean> getAssignedSubjects(String collectionIdentifier);
 

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/LPPermissionService.java

@@ -29,7 +29,8 @@ import com.google.common.collect.ImmutableCollection;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 
-import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.plugin.PluginContainer;
 import org.spongepowered.api.service.context.ContextCalculator;
@@ -46,7 +47,7 @@ import java.util.function.Predicate;
  */
 public interface LPPermissionService {
 
-    LuckPermsPlugin getPlugin();
+    LuckPermsSpongePlugin getPlugin();
 
     SubjectReferenceFactory getReferenceFactory();
 
@@ -75,7 +76,7 @@ public interface LPPermissionService {
     void registerContextCalculator(ContextCalculator<Subject> calculator);
 
     // utils
-    ImmutableList<SubjectReference> sortSubjects(Collection<SubjectReference> s);
+    ImmutableList<LPSubjectReference> sortSubjects(Collection<LPSubjectReference> s);
 
     void invalidateAllCaches(LPSubject.CacheLevel cacheLevel);
 }

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/LPSubject.java

@@ -29,6 +29,8 @@ import com.google.common.collect.ImmutableList;
 
 import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ImmutableContextSet;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.command.CommandSource;
 import org.spongepowered.api.service.permission.Subject;
@@ -46,7 +48,7 @@ public interface LPSubject {
 
     String getIdentifier();
 
-    default SubjectReference toReference() {
+    default LPSubjectReference toReference() {
         return SubjectReferenceFactory.obtain(getService(), this);
     }
 
@@ -70,14 +72,12 @@ public interface LPSubject {
 
     Tristate getPermissionValue(ImmutableContextSet contexts, String permission);
 
-    boolean isChildOf(ImmutableContextSet contexts, SubjectReference parent);
+    boolean isChildOf(ImmutableContextSet contexts, LPSubjectReference parent);
 
-    ImmutableList<SubjectReference> getParents(ImmutableContextSet contexts);
+    ImmutableList<LPSubjectReference> getParents(ImmutableContextSet contexts);
 
     Optional<String> getOption(ImmutableContextSet contexts, String key);
 
-    ImmutableContextSet getActiveContextSet();
-
     default void performCleanup() {
 
     }

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/LPSubjectCollection.java

@@ -30,6 +30,7 @@ import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 
 import me.lucko.luckperms.api.context.ImmutableContextSet;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import org.spongepowered.api.service.permission.SubjectCollection;
 
@@ -63,9 +64,9 @@ public interface LPSubjectCollection {
 
     CompletableFuture<ImmutableSet<String>> getAllIdentifiers();
 
-    CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(String permission);
+    CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(String permission);
 
-    CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission);
+    CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission);
 
     ImmutableMap<LPSubject, Boolean> getLoadedWithPermission(String permission);
 

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/LPSubjectData.java

@@ -30,6 +30,7 @@ import com.google.common.collect.ImmutableMap;
 
 import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ImmutableContextSet;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import org.spongepowered.api.service.permission.SubjectData;
 
@@ -58,15 +59,15 @@ public interface LPSubjectData {
 
     /* parents */
 
-    ImmutableMap<ImmutableContextSet, ImmutableList<SubjectReference>> getAllParents();
+    ImmutableMap<ImmutableContextSet, ImmutableList<LPSubjectReference>> getAllParents();
 
-    default ImmutableList<SubjectReference> getParents(ImmutableContextSet contexts) {
+    default ImmutableList<LPSubjectReference> getParents(ImmutableContextSet contexts) {
         return ImmutableList.copyOf(getAllParents().getOrDefault(contexts, ImmutableList.of()));
     }
 
-    CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, SubjectReference parent);
+    CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, LPSubjectReference parent);
 
-    CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, SubjectReference parent);
+    CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, LPSubjectReference parent);
 
     CompletableFuture<Boolean> clearParents();
 

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/LuckPermsSpongePlugin.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package me.lucko.luckperms.sponge.service.model;
+
+import me.lucko.luckperms.common.contexts.ContextManager;
+import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
+
+import org.spongepowered.api.service.permission.Subject;
+
+public interface LuckPermsSpongePlugin extends LuckPermsPlugin {
+
+    @Override
+    ContextManager<Subject> getContextManager();
+
+}

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/model/ProxiedSubject.java

@@ -25,11 +25,18 @@
 
 package me.lucko.luckperms.sponge.service.model;
 
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
+
+import org.spongepowered.api.service.permission.Subject;
+
+import javax.annotation.Nonnull;
+
 /**
- * Marks that an object is a proxied representation of a {@link org.spongepowered.api.service.permission.Subject}.
+ * Marks that an object is a proxied representation of a {@link Subject}.
  */
 public interface ProxiedSubject {
 
-    SubjectReference getReference();
+    @Nonnull
+    LPSubjectReference asSubjectReference();
 
 }

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/reference/LPSubjectReference.java

@@ -0,0 +1,44 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package me.lucko.luckperms.sponge.service.reference;
+
+import me.lucko.luckperms.sponge.service.model.LPSubject;
+
+import org.spongepowered.api.service.permission.SubjectReference;
+
+import java.util.concurrent.CompletableFuture;
+
+import javax.annotation.Nonnull;
+
+/**
+ * LuckPerms model for the Sponge {@link SubjectReference}
+ */
+public interface LPSubjectReference extends SubjectReference {
+
+    @Nonnull
+    CompletableFuture<LPSubject> resolveLp();
+
+}

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/reference/LuckPermsSubjectReference.java

@@ -23,7 +23,10 @@
  *  SOFTWARE.
  */
 
-package me.lucko.luckperms.sponge.service.model;
+package me.lucko.luckperms.sponge.service.reference;
+
+import me.lucko.luckperms.sponge.service.model.LPPermissionService;
+import me.lucko.luckperms.sponge.service.model.LPSubject;
 
 import org.spongepowered.api.service.permission.Subject;
 
@@ -40,7 +43,7 @@ import javax.annotation.Nonnull;
  * Use of this class (or interface) should have no negative impact on
  * performance, as {@link #resolve()} calls are cached.
  */
-public final class SubjectReference implements org.spongepowered.api.service.permission.SubjectReference {
+final class LuckPermsSubjectReference implements LPSubjectReference {
 
     /**
      * The time a subject instance should be cached in this reference
@@ -68,7 +71,7 @@ public final class SubjectReference implements org.spongepowered.api.service.per
     private long lastLookup = 0L;
     private WeakReference<LPSubject> cache = null;
 
-    SubjectReference(LPPermissionService service, String collectionIdentifier, String subjectIdentifier) {
+    LuckPermsSubjectReference(LPPermissionService service, String collectionIdentifier, String subjectIdentifier) {
         this.service = Objects.requireNonNull(service);
         this.collectionIdentifier = Objects.requireNonNull(collectionIdentifier);
         this.subjectIdentifier = Objects.requireNonNull(subjectIdentifier);
@@ -130,6 +133,8 @@ public final class SubjectReference implements org.spongepowered.api.service.per
         return s;
     }
 
+    @Nonnull
+    @Override
     public CompletableFuture<LPSubject> resolveLp() {
         // check if there is a cached value before loading
         LPSubject s = tryCache();
@@ -157,9 +162,10 @@ public final class SubjectReference implements org.spongepowered.api.service.per
     @Override
     public boolean equals(Object o) {
         if (o == this) return true;
-        if (!(o instanceof SubjectReference)) return false;
+        if (!(o instanceof LPSubjectReference)) return false;
-        final SubjectReference other = (SubjectReference) o;
+        final LPSubjectReference other = (LPSubjectReference) o;
-        return this.collectionIdentifier.equals(other.collectionIdentifier) && this.subjectIdentifier.equals(other.subjectIdentifier);
+        return this.collectionIdentifier.equals(other.getCollectionIdentifier()) &&
+                this.subjectIdentifier.equals(other.getSubjectIdentifier());
     }
 
     @Override

sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/reference/SubjectReferenceFactory.java

@@ -23,47 +23,52 @@
  *  SOFTWARE.
  */
 
-package me.lucko.luckperms.sponge.service.model;
+package me.lucko.luckperms.sponge.service.reference;
 
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.LoadingCache;
 import com.google.common.base.Splitter;
 
+import me.lucko.luckperms.sponge.service.model.LPPermissionService;
+import me.lucko.luckperms.sponge.service.model.LPSubject;
+import me.lucko.luckperms.sponge.service.model.ProxiedSubject;
+
 import org.spongepowered.api.service.permission.Subject;
+import org.spongepowered.api.service.permission.SubjectReference;
 
 import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.TimeUnit;
 
 /**
- * Caches the creation of {@link SubjectReference}s.
+ * Caches the creation of {@link LPSubjectReference}s.
  */
 public final class SubjectReferenceFactory {
 
     // static util access
 
     @Deprecated
-    public static SubjectReference deserialize(LPPermissionService service, String serialisedReference) {
+    public static LPSubjectReference deserialize(LPPermissionService service, String serialisedReference) {
         Objects.requireNonNull(service, "service");
         return service.getReferenceFactory().deserialize(serialisedReference);
     }
 
-    public static SubjectReference obtain(LPPermissionService service, LPSubject subject) {
+    public static LPSubjectReference obtain(LPPermissionService service, LPSubject subject) {
         Objects.requireNonNull(service, "service");
         return service.getReferenceFactory().obtain(subject);
     }
 
-    public static SubjectReference obtain(LPPermissionService service, Subject subject) {
+    public static LPSubjectReference obtain(LPPermissionService service, Subject subject) {
         Objects.requireNonNull(service, "service");
         return service.getReferenceFactory().obtain(subject);
     }
 
-    public static SubjectReference obtain(LPPermissionService service, org.spongepowered.api.service.permission.SubjectReference reference) {
+    public static LPSubjectReference obtain(LPPermissionService service, SubjectReference reference) {
         Objects.requireNonNull(service, "service");
         return service.getReferenceFactory().obtain(reference);
     }
 
-    public static SubjectReference obtain(LPPermissionService service, String collectionIdentifier, String subjectIdentifier) {
+    public static LPSubjectReference obtain(LPPermissionService service, String collectionIdentifier, String subjectIdentifier) {
         Objects.requireNonNull(service, "service");
         return service.getReferenceFactory().obtain(collectionIdentifier, subjectIdentifier);
     }
@@ -82,47 +87,47 @@ public final class SubjectReferenceFactory {
      *
      * It's perfectly ok if two instances of the same SubjectReference exist. (hence the 1 hour expiry)
      */
-    private final LoadingCache<SubjectReferenceAttributes, SubjectReference> referenceCache = Caffeine.newBuilder()
+    private final LoadingCache<SubjectReferenceAttributes, LuckPermsSubjectReference> referenceCache = Caffeine.newBuilder()
             .expireAfterAccess(1, TimeUnit.HOURS)
-            .build(a -> new SubjectReference(SubjectReferenceFactory.this.service, a.collectionId, a.id));
+            .build(a -> new LuckPermsSubjectReference(SubjectReferenceFactory.this.service, a.collectionId, a.id));
 
     public SubjectReferenceFactory(LPPermissionService service) {
         this.service = service;
     }
 
     @Deprecated
-    public SubjectReference deserialize(String serialisedReference) {
+    public LPSubjectReference deserialize(String serialisedReference) {
         Objects.requireNonNull(serialisedReference, "serialisedReference");
         List<String> parts = Splitter.on('/').limit(2).splitToList(serialisedReference);
         return obtain(parts.get(0), parts.get(1));
     }
 
-    public SubjectReference obtain(LPSubject subject) {
+    public LPSubjectReference obtain(LPSubject subject) {
         Objects.requireNonNull(subject, "subject");
-        SubjectReference ret = obtain(subject.getParentCollection().getIdentifier(), subject.getIdentifier());
+        LPSubjectReference ret = obtain(subject.getParentCollection().getIdentifier(), subject.getIdentifier());
-        ret.fillCache(subject);
+        ((LuckPermsSubjectReference) ret).fillCache(subject);
         return ret;
     }
 
-    public SubjectReference obtain(Subject subject) {
+    public LPSubjectReference obtain(Subject subject) {
         Objects.requireNonNull(subject, "subject");
         if (subject instanceof ProxiedSubject) {
-            return ((ProxiedSubject) subject).getReference();
+            return ((ProxiedSubject) subject).asSubjectReference();
         }
 
         return obtain(subject.getContainingCollection().getIdentifier(), subject.getIdentifier());
     }
 
-    public SubjectReference obtain(org.spongepowered.api.service.permission.SubjectReference reference) {
+    public LPSubjectReference obtain(SubjectReference reference) {
         Objects.requireNonNull(reference, "reference");
-        if (reference instanceof SubjectReference) {
+        if (reference instanceof LPSubjectReference) {
-            return ((SubjectReference) reference);
+            return ((LPSubjectReference) reference);
         } else {
             return obtain(reference.getCollectionIdentifier(), reference.getSubjectIdentifier());
         }
     }
 
-    public SubjectReference obtain(String collectionIdentifier, String subjectIdentifier) {
+    public LPSubjectReference obtain(String collectionIdentifier, String subjectIdentifier) {
         Objects.requireNonNull(collectionIdentifier, "collectionIdentifier");
         Objects.requireNonNull(subjectIdentifier, "subjectIdentifier");
         return this.referenceCache.get(new SubjectReferenceAttributes(collectionIdentifier, subjectIdentifier));
@@ -134,10 +139,12 @@ public final class SubjectReferenceFactory {
     private static final class SubjectReferenceAttributes {
         private final String collectionId;
         private final String id;
+        private final int hashCode;
 
-        public SubjectReferenceAttributes(String collectionId, String id) {
+        private SubjectReferenceAttributes(String collectionId, String id) {
-            this.collectionId = collectionId;
+            this.collectionId = collectionId.toLowerCase();
-            this.id = id;
+            this.id = id.toLowerCase();
+            this.hashCode = calculateHashCode();
         }
 
         @Override
@@ -148,14 +155,18 @@ public final class SubjectReferenceFactory {
             return this.collectionId.equals(other.collectionId) && this.id.equals(other.id);
         }
 
-        @Override
+        private int calculateHashCode() {
-        public int hashCode() {
             final int PRIME = 59;
             int result = 1;
             result = result * PRIME + this.collectionId.hashCode();
             result = result * PRIME + this.id.hashCode();
             return result;
         }
+
+        @Override
+        public int hashCode() {
+            return this.hashCode;
+        }
     }
 
 }

sponge/src/main/java/me/lucko/luckperms/sponge/LPSpongePlugin.java

@@ -57,7 +57,6 @@ import me.lucko.luckperms.common.logging.SenderLogger;
 import me.lucko.luckperms.common.managers.track.StandardTrackManager;
 import me.lucko.luckperms.common.messaging.ExtendedMessagingService;
 import me.lucko.luckperms.common.model.User;
-import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.plugin.SchedulerAdapter;
 import me.lucko.luckperms.common.storage.Storage;
 import me.lucko.luckperms.common.storage.StorageFactory;
@@ -82,6 +81,7 @@ import me.lucko.luckperms.sponge.service.LuckPermsService;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
+import me.lucko.luckperms.sponge.service.model.LuckPermsSpongePlugin;
 import me.lucko.luckperms.sponge.service.persisted.PersistedCollection;
 import me.lucko.luckperms.sponge.tasks.ServiceCacheHousekeepingTask;
 import me.lucko.luckperms.sponge.utils.VersionData;
@@ -136,7 +136,7 @@ import java.util.stream.Stream;
         description = "A permissions plugin",
         url = "https://github.com/lucko/LuckPerms"
 )
-public class LPSpongePlugin implements LuckPermsPlugin {
+public class LPSpongePlugin implements LuckPermsSpongePlugin {
 
     @Inject
     private Logger logger;

sponge/src/main/java/me/lucko/luckperms/sponge/commands/ParentInfo.java

@@ -39,7 +39,7 @@ import me.lucko.luckperms.common.locale.LocaleManager;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.utils.Predicates;
 import me.lucko.luckperms.sponge.service.model.LPSubjectData;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import java.util.List;
 import java.util.Map;
@@ -54,18 +54,18 @@ public class ParentInfo extends SubCommand<LPSubjectData> {
         ImmutableContextSet contextSet = ArgumentUtils.handleContextSponge(0, args);
         if (contextSet.isEmpty()) {
             CommandUtils.sendPluginMessage(sender, "&aShowing parents matching contexts &bANY&a.");
-            Map<ImmutableContextSet, ImmutableList<SubjectReference>> parents = subjectData.getAllParents();
+            Map<ImmutableContextSet, ImmutableList<LPSubjectReference>> parents = subjectData.getAllParents();
             if (parents.isEmpty()) {
                 CommandUtils.sendPluginMessage(sender, "That subject does not have any parents defined.");
                 return CommandResult.SUCCESS;
             }
 
-            for (Map.Entry<ImmutableContextSet, ImmutableList<SubjectReference>> e : parents.entrySet()) {
+            for (Map.Entry<ImmutableContextSet, ImmutableList<LPSubjectReference>> e : parents.entrySet()) {
                 CommandUtils.sendPluginMessage(sender, "&3>> &bContext: " + SpongeCommandUtils.contextToString(e.getKey()) + "\n" + SpongeCommandUtils.parentsToString(e.getValue()));
             }
 
         } else {
-            List<SubjectReference> parents = subjectData.getParents(contextSet);
+            List<LPSubjectReference> parents = subjectData.getParents(contextSet);
             if (parents.isEmpty()) {
                 CommandUtils.sendPluginMessage(sender, "That subject does not have any parents defined in those contexts.");
                 return CommandResult.SUCCESS;

sponge/src/main/java/me/lucko/luckperms/sponge/commands/SpongeCommandUtils.java

@@ -29,7 +29,7 @@ import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ContextSet;
 import me.lucko.luckperms.common.commands.utils.ArgumentUtils;
 import me.lucko.luckperms.common.commands.utils.CommandUtils;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import java.util.List;
 import java.util.Map;
@@ -73,9 +73,9 @@ public final class SpongeCommandUtils {
         return sb.toString();
     }
 
-    public static String parentsToString(Iterable<SubjectReference> parents) {
+    public static String parentsToString(Iterable<LPSubjectReference> parents) {
         StringBuilder sb = new StringBuilder();
-        for (SubjectReference s : parents) {
+        for (LPSubjectReference s : parents) {
             sb.append("&3> &a")
                     .append(s.getSubjectIdentifier())
                     .append(" &bfrom collection &a")

sponge/src/main/java/me/lucko/luckperms/sponge/managers/SpongeGroupManager.java

@@ -45,8 +45,8 @@ import me.lucko.luckperms.sponge.service.LuckPermsService;
 import me.lucko.luckperms.sponge.service.ProxyFactory;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.service.permission.PermissionService;
 import org.spongepowered.api.service.permission.SubjectCollection;
@@ -129,9 +129,7 @@ public class SpongeGroupManager extends AbstractGroupManager<SpongeGroup> implem
     @Override
     public CompletableFuture<LPSubject> loadSubject(String identifier) {
         if (!DataConstraints.GROUP_NAME_TEST.test(identifier)) {
-            CompletableFuture<LPSubject> fut = new CompletableFuture<>();
+            throw new IllegalArgumentException("Illegal subject identifier");
-            fut.completeExceptionally(new IllegalArgumentException("Illegal subject identifier"));
-            return fut;
         }
 
         LPSubject present = this.subjectLoadingCache.getIfPresent(identifier.toLowerCase());
@@ -144,16 +142,20 @@ public class SpongeGroupManager extends AbstractGroupManager<SpongeGroup> implem
 
     @Override
     public Optional<LPSubject> getSubject(String identifier) {
+        if (!DataConstraints.GROUP_NAME_TEST.test(identifier)) {
+            return Optional.empty();
+        }
+
         return Optional.ofNullable(getIfLoaded(identifier.toLowerCase())).map(SpongeGroup::sponge);
     }
 
     @Override
     public CompletableFuture<Boolean> hasRegistered(String identifier) {
-        if (isLoaded(identifier.toLowerCase())) {
+        if (!DataConstraints.GROUP_NAME_TEST.test(identifier)) {
-            return CompletableFuture.completedFuture(true);
-        } else {
             return CompletableFuture.completedFuture(false);
         }
+
+        return CompletableFuture.completedFuture(isLoaded(identifier.toLowerCase()));
     }
 
     @Override
@@ -161,6 +163,9 @@ public class SpongeGroupManager extends AbstractGroupManager<SpongeGroup> implem
         return CompletableFuture.supplyAsync(() -> {
             ImmutableSet.Builder<LPSubject> ret = ImmutableSet.builder();
             for (String id : identifiers) {
+                if (!DataConstraints.GROUP_NAME_TEST.test(id)) {
+                    continue;
+                }
                 ret.add(loadSubject(id.toLowerCase()).join());
             }
 
@@ -179,9 +184,9 @@ public class SpongeGroupManager extends AbstractGroupManager<SpongeGroup> implem
     }
 
     @Override
-    public CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(String permission) {
+    public CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(String permission) {
         return CompletableFuture.supplyAsync(() -> {
-            ImmutableMap.Builder<SubjectReference, Boolean> ret = ImmutableMap.builder();
+            ImmutableMap.Builder<LPSubjectReference, Boolean> ret = ImmutableMap.builder();
 
             List<HeldPermission<String>> lookup = this.plugin.getStorage().getGroupsWithPermission(permission).join();
             for (HeldPermission<String> holder : lookup) {
@@ -195,9 +200,9 @@ public class SpongeGroupManager extends AbstractGroupManager<SpongeGroup> implem
     }
 
     @Override
-    public CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission) {
+    public CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission) {
         return CompletableFuture.supplyAsync(() -> {
-            ImmutableMap.Builder<SubjectReference, Boolean> ret = ImmutableMap.builder();
+            ImmutableMap.Builder<LPSubjectReference, Boolean> ret = ImmutableMap.builder();
 
             List<HeldPermission<String>> lookup = this.plugin.getStorage().getGroupsWithPermission(permission).join();
             for (HeldPermission<String> holder : lookup) {

sponge/src/main/java/me/lucko/luckperms/sponge/managers/SpongeUserManager.java

@@ -39,14 +39,15 @@ import me.lucko.luckperms.common.managers.user.AbstractUserManager;
 import me.lucko.luckperms.common.managers.user.UserHousekeeper;
 import me.lucko.luckperms.common.references.UserIdentifier;
 import me.lucko.luckperms.common.utils.ImmutableCollectors;
+import me.lucko.luckperms.common.utils.Uuids;
 import me.lucko.luckperms.sponge.LPSpongePlugin;
 import me.lucko.luckperms.sponge.model.SpongeUser;
 import me.lucko.luckperms.sponge.service.LuckPermsService;
 import me.lucko.luckperms.sponge.service.ProxyFactory;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import org.spongepowered.api.service.permission.PermissionService;
 import org.spongepowered.api.service.permission.SubjectCollection;
@@ -133,26 +134,14 @@ public class SpongeUserManager extends AbstractUserManager<SpongeUser> implement
 
     @Override
     public Predicate<String> getIdentifierValidityPredicate() {
-        return s -> {
+        return Uuids.PREDICATE;
-            try {
-                //noinspection ResultOfMethodCallIgnored
-                UUID.fromString(s);
-                return true;
-            } catch (IllegalArgumentException e) {
-                return false;
-            }
-        };
     }
 
     @Override
     public CompletableFuture<LPSubject> loadSubject(String identifier) {
-        UUID uuid;
+        UUID uuid = Uuids.parseNullable(identifier);
-        try {
+        if (uuid == null) {
-            uuid = UUID.fromString(identifier);
+            throw new IllegalArgumentException("Identifier is not a UUID: " + identifier);
-        } catch (IllegalArgumentException e) {
-            CompletableFuture<LPSubject> fut = new CompletableFuture<>();
-            fut.completeExceptionally(e);
-            return fut;
         }
 
         LPSubject present = this.subjectLoadingCache.getIfPresent(uuid);
@@ -165,32 +154,25 @@ public class SpongeUserManager extends AbstractUserManager<SpongeUser> implement
 
     @Override
     public Optional<LPSubject> getSubject(String identifier) {
-        UUID uuid = UUID.fromString(identifier);
+        UUID uuid = Uuids.parseNullable(identifier);
+        if (uuid == null) {
+            return Optional.empty();
+        }
         return Optional.ofNullable(getIfLoaded(uuid)).map(SpongeUser::sponge);
     }
 
     @Override
     public CompletableFuture<Boolean> hasRegistered(String identifier) {
-        UUID uuid = null;
+        UUID uuid = Uuids.parseNullable(identifier);
-        IllegalArgumentException ex = null;
+        if (uuid == null) {
-        try {
+            return CompletableFuture.completedFuture(false);
-            uuid = UUID.fromString(identifier);
-        } catch (IllegalArgumentException e) {
-            ex = e;
         }
 
-        if (uuid != null && isLoaded(UserIdentifier.of(uuid, null))) {
+        if (isLoaded(UserIdentifier.of(uuid, null))) {
             return CompletableFuture.completedFuture(true);
         }
 
-        if (uuid == null) {
+        return this.plugin.getStorage().getUniqueUsers().thenApply(set -> set.contains(uuid));
-            CompletableFuture<Boolean> fut = new CompletableFuture<>();
-            fut.completeExceptionally(ex);
-            return fut;
-        }
-
-        UUID finalUuid = uuid;
-        return this.plugin.getStorage().getUniqueUsers().thenApply(set -> set.contains(finalUuid));
     }
 
     @Override
@@ -198,13 +180,10 @@ public class SpongeUserManager extends AbstractUserManager<SpongeUser> implement
         return CompletableFuture.supplyAsync(() -> {
             ImmutableSet.Builder<LPSubject> ret = ImmutableSet.builder();
             for (String id : identifiers) {
-                UUID uuid;
+                UUID uuid = Uuids.parseNullable(id);
-                try {
+                if (uuid == null) {
-                    uuid = UUID.fromString(id);
-                } catch (IllegalArgumentException e) {
                     continue;
                 }
-
                 ret.add(loadSubject(uuid.toString()).join());
             }
 
@@ -230,9 +209,9 @@ public class SpongeUserManager extends AbstractUserManager<SpongeUser> implement
     }
 
     @Override
-    public CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(String permission) {
+    public CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(String permission) {
         return CompletableFuture.supplyAsync(() -> {
-            ImmutableMap.Builder<SubjectReference, Boolean> ret = ImmutableMap.builder();
+            ImmutableMap.Builder<LPSubjectReference, Boolean> ret = ImmutableMap.builder();
 
             List<HeldPermission<UUID>> lookup = this.plugin.getStorage().getUsersWithPermission(permission).join();
             for (HeldPermission<UUID> holder : lookup) {
@@ -246,9 +225,9 @@ public class SpongeUserManager extends AbstractUserManager<SpongeUser> implement
     }
 
     @Override
-    public CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission) {
+    public CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission) {
         return CompletableFuture.supplyAsync(() -> {
-            ImmutableMap.Builder<SubjectReference, Boolean> ret = ImmutableMap.builder();
+            ImmutableMap.Builder<LPSubjectReference, Boolean> ret = ImmutableMap.builder();
 
             List<HeldPermission<UUID>> lookup = this.plugin.getStorage().getUsersWithPermission(permission).join();
             for (HeldPermission<UUID> holder : lookup) {

sponge/src/main/java/me/lucko/luckperms/sponge/migration/MigrationPermissionManager.java

@@ -31,7 +31,6 @@ import me.lucko.luckperms.common.commands.CommandResult;
 import me.lucko.luckperms.common.commands.abstraction.SubCommand;
 import me.lucko.luckperms.common.commands.impl.migration.MigrationUtils;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
 import me.lucko.luckperms.common.logging.ProgressLogger;
@@ -40,6 +39,7 @@ import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.utils.Predicates;
 import me.lucko.luckperms.common.utils.SafeIterator;
+import me.lucko.luckperms.common.utils.Uuids;
 import me.lucko.luckperms.sponge.LPSpongePlugin;
 import me.lucko.luckperms.sponge.service.LuckPermsService;
 
@@ -119,7 +119,7 @@ public class MigrationPermissionManager extends SubCommand<Object> {
         log.log("Starting user migration.");
         AtomicInteger userCount = new AtomicInteger(0);
         SafeIterator.iterate(pmService.getUserSubjects().getAllSubjects(), pmUser -> {
-            UUID uuid = CommandUtils.parseUuid(pmUser.getIdentifier());
+            UUID uuid = Uuids.parseNullable(pmUser.getIdentifier());
             if (uuid == null) {
                 log.logErr("Could not parse UUID for user: " + pmUser.getIdentifier());
                 return;

sponge/src/main/java/me/lucko/luckperms/sponge/migration/MigrationPermissionsEx.java

@@ -31,7 +31,6 @@ import me.lucko.luckperms.common.commands.CommandResult;
 import me.lucko.luckperms.common.commands.abstraction.SubCommand;
 import me.lucko.luckperms.common.commands.impl.migration.MigrationUtils;
 import me.lucko.luckperms.common.commands.sender.Sender;
-import me.lucko.luckperms.common.commands.utils.CommandUtils;
 import me.lucko.luckperms.common.locale.CommandSpec;
 import me.lucko.luckperms.common.locale.LocaleManager;
 import me.lucko.luckperms.common.logging.ProgressLogger;
@@ -41,6 +40,7 @@ import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.utils.Predicates;
 import me.lucko.luckperms.common.utils.SafeIterator;
+import me.lucko.luckperms.common.utils.Uuids;
 import me.lucko.luckperms.sponge.LPSpongePlugin;
 import me.lucko.luckperms.sponge.service.LuckPermsService;
 
@@ -172,7 +172,7 @@ public class MigrationPermissionsEx extends SubCommand<Object> {
         int userWeight = maxWeight + 5;
 
         SafeIterator.iterate(pexService.getUserSubjects().getAllSubjects(), pexUser -> {
-            UUID uuid = CommandUtils.parseUuid(pexUser.getIdentifier());
+            UUID uuid = Uuids.parseNullable(pexUser.getIdentifier());
             if (uuid == null) {
                 log.logErr("Could not parse UUID for user: " + pexUser.getIdentifier());
                 return;

sponge/src/main/java/me/lucko/luckperms/sponge/model/SpongeGroup.java

@@ -40,7 +40,7 @@ import me.lucko.luckperms.sponge.service.LuckPermsSubjectData;
 import me.lucko.luckperms.sponge.service.ProxyFactory;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import org.spongepowered.api.command.CommandSource;
 import org.spongepowered.api.service.permission.PermissionService;
@@ -123,13 +123,13 @@ public class SpongeGroup extends Group {
         }
 
         @Override
-        public boolean isChildOf(ImmutableContextSet contexts, SubjectReference parent) {
+        public boolean isChildOf(ImmutableContextSet contexts, LPSubjectReference parent) {
             return parent.getCollectionIdentifier().equals(PermissionService.SUBJECTS_GROUP) && getPermissionValue(contexts, NodeFactory.groupNode(parent.getSubjectIdentifier())).asBoolean();
         }
 
         @Override
-        public ImmutableList<SubjectReference> getParents(ImmutableContextSet contexts) {
+        public ImmutableList<LPSubjectReference> getParents(ImmutableContextSet contexts) {
-            ImmutableSet.Builder<SubjectReference> subjects = ImmutableSet.builder();
+            ImmutableSet.Builder<LPSubjectReference> subjects = ImmutableSet.builder();
 
             for (Map.Entry<String, Boolean> entry : this.parent.getCachedData().getPermissionData(this.plugin.getContextManager().formContexts(contexts)).getImmutableBacking().entrySet()) {
                 if (!entry.getValue()) {
@@ -180,11 +180,6 @@ public class SpongeGroup extends Group {
             return this.plugin.getService().getDefaults().getOption(contexts, s);
         }
 
-        @Override
-        public ImmutableContextSet getActiveContextSet() {
-            return this.plugin.getContextManager().getApplicableContext(this.sponge());
-        }
-
         @Override
         public void invalidateCaches(CacheLevel cacheLevel) {
             // invalidate for all changes

sponge/src/main/java/me/lucko/luckperms/sponge/model/SpongeUser.java

@@ -40,7 +40,7 @@ import me.lucko.luckperms.sponge.service.LuckPermsSubjectData;
 import me.lucko.luckperms.sponge.service.ProxyFactory;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import org.spongepowered.api.Sponge;
 import org.spongepowered.api.command.CommandSource;
@@ -132,13 +132,13 @@ public class SpongeUser extends User {
         }
 
         @Override
-        public boolean isChildOf(ImmutableContextSet contexts, SubjectReference parent) {
+        public boolean isChildOf(ImmutableContextSet contexts, LPSubjectReference parent) {
             return parent.getCollectionIdentifier().equals(PermissionService.SUBJECTS_GROUP) && getPermissionValue(contexts, NodeFactory.groupNode(parent.getSubjectIdentifier())).asBoolean();
         }
 
         @Override
-        public ImmutableList<SubjectReference> getParents(ImmutableContextSet contexts) {
+        public ImmutableList<LPSubjectReference> getParents(ImmutableContextSet contexts) {
-            ImmutableSet.Builder<SubjectReference> subjects = ImmutableSet.builder();
+            ImmutableSet.Builder<LPSubjectReference> subjects = ImmutableSet.builder();
 
             for (Map.Entry<String, Boolean> entry : this.parent.getCachedData().getPermissionData(this.plugin.getContextManager().formContexts(contexts)).getImmutableBacking().entrySet()) {
                 if (!entry.getValue()) {
@@ -189,11 +189,6 @@ public class SpongeUser extends User {
             return this.plugin.getService().getDefaults().getOption(contexts, s);
         }
 
-        @Override
-        public ImmutableContextSet getActiveContextSet() {
-            return this.plugin.getContextManager().getApplicableContext(this.sponge());
-        }
-
         @Override
         public void invalidateCaches(CacheLevel cacheLevel) {
             // invalidate for all changes

sponge/src/main/java/me/lucko/luckperms/sponge/processors/DefaultsProcessor.java

@@ -0,0 +1,66 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package me.lucko.luckperms.sponge.processors;
+
+import me.lucko.luckperms.api.Tristate;
+import me.lucko.luckperms.api.context.ImmutableContextSet;
+import me.lucko.luckperms.common.processors.PermissionProcessor;
+import me.lucko.luckperms.sponge.service.LuckPermsService;
+import me.lucko.luckperms.sponge.service.model.LPSubject;
+
+import java.util.Map;
+
+public abstract class DefaultsProcessor implements PermissionProcessor {
+    private final LuckPermsService service;
+    private final ImmutableContextSet contexts;
+
+    public DefaultsProcessor(LuckPermsService service, ImmutableContextSet contexts) {
+        this.service = service;
+        this.contexts = contexts;
+    }
+
+    protected abstract LPSubject getTypeDefaults(LuckPermsService service);
+
+    @Override
+    public Tristate hasPermission(String permission) {
+        Tristate t = getTypeDefaults(this.service).getPermissionValue(this.contexts, permission);
+        if (t != Tristate.UNDEFINED) {
+            return t;
+        }
+
+        t = this.service.getDefaults().getPermissionValue(this.contexts, permission);
+        if (t != Tristate.UNDEFINED) {
+            return t;
+        }
+
+        return Tristate.UNDEFINED;
+    }
+
+    @Override
+    public void updateBacking(Map<String, Boolean> map) {
+        // Do nothing, this doesn't use the backing
+    }
+}

sponge/src/main/java/me/lucko/luckperms/sponge/processors/GroupDefaultsProcessor.java

@@ -25,39 +25,18 @@
 
 package me.lucko.luckperms.sponge.processors;
 
-import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.common.processors.PermissionProcessor;
 import me.lucko.luckperms.sponge.service.LuckPermsService;
+import me.lucko.luckperms.sponge.service.model.LPSubject;
 
-import java.util.Map;
+public class GroupDefaultsProcessor extends DefaultsProcessor implements PermissionProcessor {
-
-public class GroupDefaultsProcessor implements PermissionProcessor {
-    private final LuckPermsService service;
-    private final ImmutableContextSet contexts;
-
     public GroupDefaultsProcessor(LuckPermsService service, ImmutableContextSet contexts) {
-        this.service = service;
+        super(service, contexts);
-        this.contexts = contexts;
     }
 
     @Override
-    public Tristate hasPermission(String permission) {
+    protected LPSubject getTypeDefaults(LuckPermsService service) {
-        Tristate t = this.service.getGroupSubjects().getDefaults().getPermissionValue(this.contexts, permission);
+        return service.getGroupSubjects().getDefaults();
-        if (t != Tristate.UNDEFINED) {
-            return t;
-        }
-
-        t = this.service.getDefaults().getPermissionValue(this.contexts, permission);
-        if (t != Tristate.UNDEFINED) {
-            return t;
-        }
-
-        return Tristate.UNDEFINED;
-    }
-
-    @Override
-    public void updateBacking(Map<String, Boolean> map) {
-        // Do nothing, this doesn't use the backing
     }
 }

sponge/src/main/java/me/lucko/luckperms/sponge/processors/UserDefaultsProcessor.java

@@ -25,39 +25,18 @@
 
 package me.lucko.luckperms.sponge.processors;
 
-import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.common.processors.PermissionProcessor;
 import me.lucko.luckperms.sponge.service.LuckPermsService;
+import me.lucko.luckperms.sponge.service.model.LPSubject;
 
-import java.util.Map;
+public class UserDefaultsProcessor extends DefaultsProcessor implements PermissionProcessor {
-
-public class UserDefaultsProcessor implements PermissionProcessor {
-    private final LuckPermsService service;
-    private final ImmutableContextSet contexts;
-
     public UserDefaultsProcessor(LuckPermsService service, ImmutableContextSet contexts) {
-        this.service = service;
+        super(service, contexts);
-        this.contexts = contexts;
     }
 
     @Override
-    public Tristate hasPermission(String permission) {
+    protected LPSubject getTypeDefaults(LuckPermsService service) {
-        Tristate t = this.service.getUserSubjects().getDefaults().getPermissionValue(this.contexts, permission);
+        return service.getUserSubjects().getDefaults();
-        if (t != Tristate.UNDEFINED) {
-            return t;
-        }
-
-        t = this.service.getDefaults().getPermissionValue(this.contexts, permission);
-        if (t != Tristate.UNDEFINED) {
-            return t;
-        }
-
-        return Tristate.UNDEFINED;
-    }
-
-    @Override
-    public void updateBacking(Map<String, Boolean> map) {
-        // Do nothing, this doesn't use the backing
     }
 }

sponge/src/main/java/me/lucko/luckperms/sponge/service/LuckPermsPermissionDescription.java

@@ -29,7 +29,7 @@ import me.lucko.luckperms.sponge.service.model.LPPermissionDescription;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import org.spongepowered.api.plugin.PluginContainer;
 import org.spongepowered.api.service.permission.PermissionDescription;
@@ -89,7 +89,7 @@ public final class LuckPermsPermissionDescription implements LPPermissionDescrip
 
     @SuppressWarnings("unchecked")
     @Override
-    public CompletableFuture<Map<SubjectReference, Boolean>> findAssignedSubjects(String id) {
+    public CompletableFuture<Map<LPSubjectReference, Boolean>> findAssignedSubjects(String id) {
         LPSubjectCollection collection = this.service.getCollection(id);
         return (CompletableFuture) collection.getAllWithPermission(this.id);
     }

sponge/src/main/java/me/lucko/luckperms/sponge/service/LuckPermsService.java

@@ -42,9 +42,9 @@ import me.lucko.luckperms.sponge.service.model.LPPermissionDescription;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
 import me.lucko.luckperms.sponge.service.persisted.PersistedCollection;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 import me.lucko.luckperms.sponge.service.storage.SubjectStorage;
 
 import org.spongepowered.api.plugin.PluginContainer;
@@ -211,8 +211,8 @@ public class LuckPermsService implements LPPermissionService {
     }
 
     @Override
-    public ImmutableList<SubjectReference> sortSubjects(Collection<SubjectReference> s) {
+    public ImmutableList<LPSubjectReference> sortSubjects(Collection<LPSubjectReference> s) {
-        List<SubjectReference> ret = new ArrayList<>(s);
+        List<LPSubjectReference> ret = new ArrayList<>(s);
         ret.sort(Collections.reverseOrder((o1, o2) -> {
             if (o1.equals(o2)) {
                 return 0;

sponge/src/main/java/me/lucko/luckperms/sponge/service/LuckPermsSubjectData.java

@@ -40,7 +40,7 @@ import me.lucko.luckperms.common.model.User;
 import me.lucko.luckperms.common.node.NodeFactory;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectData;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import org.spongepowered.api.service.permission.PermissionService;
 
@@ -178,11 +178,11 @@ public class LuckPermsSubjectData implements LPSubjectData {
     }
 
     @Override
-    public ImmutableMap<ImmutableContextSet, ImmutableList<SubjectReference>> getAllParents() {
+    public ImmutableMap<ImmutableContextSet, ImmutableList<LPSubjectReference>> getAllParents() {
-        Map<ImmutableContextSet, ImmutableList.Builder<SubjectReference>> parents = new HashMap<>();
+        Map<ImmutableContextSet, ImmutableList.Builder<LPSubjectReference>> parents = new HashMap<>();
 
         for (Map.Entry<ImmutableContextSet, Collection<Node>> e : (this.enduring ? this.holder.getEnduringNodes() : this.holder.getTransientNodes()).asMap().entrySet()) {
-            ImmutableList.Builder<SubjectReference> results = ImmutableList.builder();
+            ImmutableList.Builder<LPSubjectReference> results = ImmutableList.builder();
             for (Node n : e.getValue()) {
                 if (n.isGroupNode()) {
                     results.add(this.service.getGroupSubjects().loadSubject(n.getGroupName()).join().toReference());
@@ -191,15 +191,15 @@ public class LuckPermsSubjectData implements LPSubjectData {
             parents.put(e.getKey(), results);
         }
 
-        ImmutableMap.Builder<ImmutableContextSet, ImmutableList<SubjectReference>> map = ImmutableMap.builder();
+        ImmutableMap.Builder<ImmutableContextSet, ImmutableList<LPSubjectReference>> map = ImmutableMap.builder();
-        for (Map.Entry<ImmutableContextSet, ImmutableList.Builder<SubjectReference>> e : parents.entrySet()) {
+        for (Map.Entry<ImmutableContextSet, ImmutableList.Builder<LPSubjectReference>> e : parents.entrySet()) {
             map.put(e.getKey(), e.getValue().build());
         }
         return map.build();
     }
 
     @Override
-    public CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, SubjectReference subject) {
+    public CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, LPSubjectReference subject) {
         Objects.requireNonNull(contexts, "contexts");
         Objects.requireNonNull(subject, "subject");
 
@@ -228,7 +228,7 @@ public class LuckPermsSubjectData implements LPSubjectData {
     }
 
     @Override
-    public CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, SubjectReference subject) {
+    public CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, LPSubjectReference subject) {
         Objects.requireNonNull(contexts, "contexts");
         Objects.requireNonNull(subject, "subject");
 

sponge/src/main/java/me/lucko/luckperms/sponge/service/calculated/CalculatedSubjectData.java

@@ -45,7 +45,7 @@ import me.lucko.luckperms.sponge.processors.SpongeWildcardProcessor;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectData;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import java.util.HashMap;
 import java.util.List;
@@ -70,7 +70,7 @@ public class CalculatedSubjectData implements LPSubjectData {
     private final String calculatorDisplayName;
 
     private final Map<ImmutableContextSet, Map<String, Boolean>> permissions = new ConcurrentHashMap<>();
-    private final Map<ImmutableContextSet, Set<SubjectReference>> parents = new ConcurrentHashMap<>();
+    private final Map<ImmutableContextSet, Set<LPSubjectReference>> parents = new ConcurrentHashMap<>();
     private final Map<ImmutableContextSet, Map<String, String>> options = new ConcurrentHashMap<>();
 
     private final LoadingCache<ImmutableContextSet, CalculatorHolder> permissionCache = Caffeine.newBuilder()
@@ -121,10 +121,10 @@ public class CalculatedSubjectData implements LPSubjectData {
         this.service.invalidateAllCaches(LPSubject.CacheLevel.PERMISSION);
     }
 
-    public void replaceParents(Map<ImmutableContextSet, List<SubjectReference>> map) {
+    public void replaceParents(Map<ImmutableContextSet, List<LPSubjectReference>> map) {
         this.parents.clear();
-        for (Map.Entry<ImmutableContextSet, List<SubjectReference>> e : map.entrySet()) {
+        for (Map.Entry<ImmutableContextSet, List<LPSubjectReference>> e : map.entrySet()) {
-            Set<SubjectReference> set = ConcurrentHashMap.newKeySet();
+            Set<LPSubjectReference> set = ConcurrentHashMap.newKeySet();
             set.addAll(e.getValue());
             this.parents.put(e.getKey(), set);
         }
@@ -194,17 +194,17 @@ public class CalculatedSubjectData implements LPSubjectData {
     }
 
     @Override
-    public ImmutableMap<ImmutableContextSet, ImmutableList<SubjectReference>> getAllParents() {
+    public ImmutableMap<ImmutableContextSet, ImmutableList<LPSubjectReference>> getAllParents() {
-        ImmutableMap.Builder<ImmutableContextSet, ImmutableList<SubjectReference>> map = ImmutableMap.builder();
+        ImmutableMap.Builder<ImmutableContextSet, ImmutableList<LPSubjectReference>> map = ImmutableMap.builder();
-        for (Map.Entry<ImmutableContextSet, Set<SubjectReference>> e : this.parents.entrySet()) {
+        for (Map.Entry<ImmutableContextSet, Set<LPSubjectReference>> e : this.parents.entrySet()) {
             map.put(e.getKey(), this.service.sortSubjects(e.getValue()));
         }
         return map.build();
     }
 
     @Override
-    public CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, SubjectReference parent) {
+    public CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, LPSubjectReference parent) {
-        Set<SubjectReference> set = this.parents.computeIfAbsent(contexts, c -> ConcurrentHashMap.newKeySet());
+        Set<LPSubjectReference> set = this.parents.computeIfAbsent(contexts, c -> ConcurrentHashMap.newKeySet());
         boolean b = set.add(parent);
         if (b) {
             this.service.invalidateAllCaches(LPSubject.CacheLevel.PARENT);
@@ -213,8 +213,8 @@ public class CalculatedSubjectData implements LPSubjectData {
     }
 
     @Override
-    public CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, SubjectReference parent) {
+    public CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, LPSubjectReference parent) {
-        Set<SubjectReference> set = this.parents.get(contexts);
+        Set<LPSubjectReference> set = this.parents.get(contexts);
         boolean b = set != null && set.remove(parent);
         if (b) {
             this.service.invalidateAllCaches(LPSubject.CacheLevel.PARENT);
@@ -235,7 +235,7 @@ public class CalculatedSubjectData implements LPSubjectData {
 
     @Override
     public CompletableFuture<Boolean> clearParents(ImmutableContextSet contexts) {
-        Set<SubjectReference> set = this.parents.get(contexts);
+        Set<LPSubjectReference> set = this.parents.get(contexts);
         if (set == null) {
             return CompletableFuture.completedFuture(false);
         }

sponge/src/main/java/me/lucko/luckperms/sponge/service/legacy/SubjectDataHolder.java

@@ -27,7 +27,7 @@ package me.lucko.luckperms.sponge.service.legacy;
 
 import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 import me.lucko.luckperms.sponge.service.storage.SubjectStorageModel;
 
 import java.util.List;

sponge/src/main/java/me/lucko/luckperms/sponge/service/persisted/PersistedCollection.java

@@ -40,12 +40,13 @@ import me.lucko.luckperms.sponge.service.LuckPermsService;
 import me.lucko.luckperms.sponge.service.ProxyFactory;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
 import me.lucko.luckperms.sponge.service.model.LPSubjectCollection;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 import me.lucko.luckperms.sponge.service.storage.SubjectStorageModel;
 
 import org.spongepowered.api.service.permission.SubjectCollection;
 
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
@@ -73,7 +74,9 @@ public class PersistedCollection implements LPSubjectCollection {
         Map<String, SubjectStorageModel> holders = this.service.getStorage().loadAllFromFile(this.identifier);
         for (Map.Entry<String, SubjectStorageModel> e : holders.entrySet()) {
             PersistedSubject subject = this.subjects.get(e.getKey().toLowerCase());
-            subject.loadData(e.getValue());
+            if (subject != null) {
+                subject.loadData(e.getValue());
+            }
         }
     }
 
@@ -104,7 +107,7 @@ public class PersistedCollection implements LPSubjectCollection {
 
     @Override
     public Optional<LPSubject> getSubject(String identifier) {
-        return Optional.of(this.subjects.get(identifier.toLowerCase()));
+        return Optional.of(Objects.requireNonNull(this.subjects.get(identifier.toLowerCase())));
     }
 
     @Override
@@ -116,7 +119,7 @@ public class PersistedCollection implements LPSubjectCollection {
     public CompletableFuture<ImmutableCollection<LPSubject>> loadSubjects(Set<String> identifiers) {
         ImmutableSet.Builder<LPSubject> ret = ImmutableSet.builder();
         for (String id : identifiers) {
-            ret.add(this.subjects.get(id.toLowerCase()));
+            ret.add(Objects.requireNonNull(this.subjects.get(id.toLowerCase())));
         }
         return CompletableFuture.completedFuture(ret.build());
     }
@@ -132,13 +135,13 @@ public class PersistedCollection implements LPSubjectCollection {
     }
 
     @Override
-    public CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(String permission) {
+    public CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(String permission) {
         return CompletableFuture.completedFuture(getLoadedWithPermission(permission).entrySet().stream()
                 .collect(ImmutableCollectors.toMap(e -> e.getKey().toReference(), Map.Entry::getValue)));
     }
 
     @Override
-    public CompletableFuture<ImmutableMap<SubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission) {
+    public CompletableFuture<ImmutableMap<LPSubjectReference, Boolean>> getAllWithPermission(ImmutableContextSet contexts, String permission) {
         return CompletableFuture.completedFuture(getLoadedWithPermission(contexts, permission).entrySet().stream()
                 .collect(ImmutableCollectors.toMap(e -> e.getKey().toReference(), Map.Entry::getValue)));
     }

sponge/src/main/java/me/lucko/luckperms/sponge/service/persisted/PersistedSubject.java

@@ -37,7 +37,7 @@ import me.lucko.luckperms.sponge.service.LuckPermsService;
 import me.lucko.luckperms.sponge.service.ProxyFactory;
 import me.lucko.luckperms.sponge.service.calculated.CalculatedSubjectData;
 import me.lucko.luckperms.sponge.service.model.LPSubject;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 import me.lucko.luckperms.sponge.service.storage.SubjectStorageModel;
 
 import org.spongepowered.api.command.CommandSource;
@@ -66,7 +66,7 @@ public class PersistedSubject implements LPSubject {
             .expireAfterAccess(20, TimeUnit.MINUTES)
             .build(lookup -> lookupPermissionValue(lookup.getContexts(), lookup.getNode()));
 
-    private final LoadingCache<ImmutableContextSet, ImmutableList<SubjectReference>> parentLookupCache = Caffeine.newBuilder()
+    private final LoadingCache<ImmutableContextSet, ImmutableList<LPSubjectReference>> parentLookupCache = Caffeine.newBuilder()
             .expireAfterAccess(20, TimeUnit.MINUTES)
             .build(this::lookupParents);
 
@@ -194,7 +194,7 @@ public class PersistedSubject implements LPSubject {
             }
         }
 
-        for (SubjectReference parent : getParents(contexts)) {
+        for (LPSubjectReference parent : getParents(contexts)) {
             res = parent.resolveLp().join().getPermissionValue(contexts, node);
             if (res != Tristate.UNDEFINED) {
                 return res;
@@ -214,8 +214,8 @@ public class PersistedSubject implements LPSubject {
         return res;
     }
 
-    private ImmutableList<SubjectReference> lookupParents(ImmutableContextSet contexts) {
+    private ImmutableList<LPSubjectReference> lookupParents(ImmutableContextSet contexts) {
-        List<SubjectReference> s = new ArrayList<>();
+        List<LPSubjectReference> s = new ArrayList<>();
         s.addAll(this.subjectData.getParents(contexts));
         s.addAll(this.transientSubjectData.getParents(contexts));
 
@@ -253,7 +253,7 @@ public class PersistedSubject implements LPSubject {
             }
         }
 
-        for (SubjectReference parent : getParents(contexts)) {
+        for (LPSubjectReference parent : getParents(contexts)) {
             res = parent.resolveLp().join().getOption(contexts, key);
             if (res.isPresent()) {
                 return res;
@@ -283,7 +283,7 @@ public class PersistedSubject implements LPSubject {
     }
 
     @Override
-    public boolean isChildOf(ImmutableContextSet contexts, SubjectReference subject) {
+    public boolean isChildOf(ImmutableContextSet contexts, LPSubjectReference subject) {
         Objects.requireNonNull(contexts, "contexts");
         Objects.requireNonNull(subject, "subject");
 
@@ -299,7 +299,7 @@ public class PersistedSubject implements LPSubject {
     }
 
     @Override
-    public ImmutableList<SubjectReference> getParents(ImmutableContextSet contexts) {
+    public ImmutableList<LPSubjectReference> getParents(ImmutableContextSet contexts) {
         Objects.requireNonNull(contexts, "contexts");
         return this.parentLookupCache.get(contexts);
     }
@@ -308,9 +308,4 @@ public class PersistedSubject implements LPSubject {
     public Optional<String> getOption(ImmutableContextSet contexts, String key) {
         return this.optionLookupCache.get(OptionLookupKey.of(key, contexts));
     }
-
-    @Override
-    public ImmutableContextSet getActiveContextSet() {
-        return this.service.getPlugin().getContextManager().getApplicableContext(sponge());
-    }
 }

sponge/src/main/java/me/lucko/luckperms/sponge/service/persisted/PersistedSubjectData.java

@@ -29,7 +29,7 @@ import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.api.context.ImmutableContextSet;
 import me.lucko.luckperms.sponge.service.LuckPermsService;
 import me.lucko.luckperms.sponge.service.calculated.CalculatedSubjectData;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
 
 import java.util.concurrent.CompletableFuture;
 import java.util.function.Function;
@@ -79,12 +79,12 @@ public class PersistedSubjectData extends CalculatedSubjectData implements Funct
     }
 
     @Override
-    public CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, SubjectReference parent) {
+    public CompletableFuture<Boolean> addParent(ImmutableContextSet contexts, LPSubjectReference parent) {
         return super.addParent(contexts, parent).thenApply(this);
     }
 
     @Override
-    public CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, SubjectReference parent) {
+    public CompletableFuture<Boolean> removeParent(ImmutableContextSet contexts, LPSubjectReference parent) {
         return super.removeParent(contexts, parent).thenApply(this);
     }
 

sponge/src/main/java/me/lucko/luckperms/sponge/service/storage/SubjectStorageModel.java

@@ -38,8 +38,8 @@ import me.lucko.luckperms.common.contexts.ContextSetJsonSerializer;
 import me.lucko.luckperms.common.utils.CollationKeyCache;
 import me.lucko.luckperms.sponge.service.calculated.CalculatedSubjectData;
 import me.lucko.luckperms.sponge.service.model.LPPermissionService;
-import me.lucko.luckperms.sponge.service.model.SubjectReference;
+import me.lucko.luckperms.sponge.service.reference.LPSubjectReference;
-import me.lucko.luckperms.sponge.service.model.SubjectReferenceFactory;
+import me.lucko.luckperms.sponge.service.reference.SubjectReferenceFactory;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -52,9 +52,9 @@ public class SubjectStorageModel {
     private final LPPermissionService service;
     private final Map<ImmutableContextSet, Map<String, Boolean>> permissions;
     private final Map<ImmutableContextSet, Map<String, String>> options;
-    private final Map<ImmutableContextSet, List<SubjectReference>> parents;
+    private final Map<ImmutableContextSet, List<LPSubjectReference>> parents;
 
-    public SubjectStorageModel(LPPermissionService service, Map<ImmutableContextSet, ? extends Map<String, Boolean>> permissions, Map<ImmutableContextSet, ? extends Map<String, String>> options, Map<ImmutableContextSet, ? extends List<SubjectReference>> parents) {
+    public SubjectStorageModel(LPPermissionService service, Map<ImmutableContextSet, ? extends Map<String, Boolean>> permissions, Map<ImmutableContextSet, ? extends Map<String, String>> options, Map<ImmutableContextSet, ? extends List<LPSubjectReference>> parents) {
         this.service = service;
 
         ImmutableMap.Builder<ImmutableContextSet, Map<String, Boolean>> permissionsBuilder = ImmutableMap.builder();
@@ -69,8 +69,8 @@ public class SubjectStorageModel {
         }
         this.options = optionsBuilder.build();
 
-        ImmutableMap.Builder<ImmutableContextSet, List<SubjectReference>> parentsBuilder = ImmutableMap.builder();
+        ImmutableMap.Builder<ImmutableContextSet, List<LPSubjectReference>> parentsBuilder = ImmutableMap.builder();
-        for (Map.Entry<ImmutableContextSet, ? extends List<SubjectReference>> e : parents.entrySet()) {
+        for (Map.Entry<ImmutableContextSet, ? extends List<LPSubjectReference>> e : parents.entrySet()) {
             parentsBuilder.put(e.getKey(), ImmutableList.copyOf(e.getValue()));
         }
         this.parents = parentsBuilder.build();
@@ -137,7 +137,7 @@ public class SubjectStorageModel {
         }
         this.options = optionsBuilder.build();
 
-        ImmutableMap.Builder<ImmutableContextSet, List<SubjectReference>> parentsBuilder = ImmutableMap.builder();
+        ImmutableMap.Builder<ImmutableContextSet, List<LPSubjectReference>> parentsBuilder = ImmutableMap.builder();
         for (JsonElement e : parents) {
             if (!e.isJsonObject()) {
                 continue;
@@ -151,7 +151,7 @@ public class SubjectStorageModel {
             JsonArray data = section.get("data").getAsJsonArray();
 
             ImmutableContextSet contextSet = ContextSetJsonSerializer.deserializeContextSet(context).makeImmutable();
-            ImmutableList.Builder<SubjectReference> pars = ImmutableList.builder();
+            ImmutableList.Builder<LPSubjectReference> pars = ImmutableList.builder();
             for (JsonElement p : data) {
                 if (!p.isJsonObject()) {
                     continue;
@@ -228,7 +228,7 @@ public class SubjectStorageModel {
         root.add("options", options);
 
         JsonArray parents = new JsonArray();
-        for (Map.Entry<ImmutableContextSet, List<SubjectReference>> e : sortContextMap(this.parents)) {
+        for (Map.Entry<ImmutableContextSet, List<LPSubjectReference>> e : sortContextMap(this.parents)) {
             if (e.getValue().isEmpty()) {
                 continue;
             }
@@ -237,7 +237,7 @@ public class SubjectStorageModel {
             section.add("context", ContextSetJsonSerializer.serializeContextSet(e.getKey()));
 
             JsonArray data = new JsonArray();
-            for (SubjectReference ref : e.getValue()) {
+            for (LPSubjectReference ref : e.getValue()) {
                 JsonObject parent = new JsonObject();
                 parent.addProperty("collection", ref.getCollectionIdentifier());
                 parent.addProperty("subject", ref.getCollectionIdentifier());