Add a means to provide a custom Storage dao implementation (#590)

common/src/main/java/me/lucko/luckperms/common/dependencies/DependencyRegistry.java

@@ -50,6 +50,7 @@ public class DependencyRegistry {
             .put(StorageType.POSTGRESQL, ImmutableList.of(Dependency.POSTGRESQL_DRIVER, Dependency.SLF4J_API, Dependency.SLF4J_SIMPLE, Dependency.HIKARI))
             .put(StorageType.SQLITE, ImmutableList.of(Dependency.SQLITE_DRIVER))
             .put(StorageType.H2, ImmutableList.of(Dependency.H2_DRIVER))
+            .put(StorageType.CUSTOM, ImmutableList.of())
             .build();
 
     private final LuckPermsPlugin plugin;

common/src/main/java/me/lucko/luckperms/common/storage/StorageFactory.java

@@ -42,6 +42,7 @@ import me.lucko.luckperms.common.storage.dao.sql.connection.file.SQLiteConnectio
 import me.lucko.luckperms.common.storage.dao.sql.connection.hikari.MariaDbConnectionFactory;
 import me.lucko.luckperms.common.storage.dao.sql.connection.hikari.MySqlConnectionFactory;
 import me.lucko.luckperms.common.storage.dao.sql.connection.hikari.PostgreConnectionFactory;
+import me.lucko.luckperms.common.storage.provider.StorageProviders;
 import me.lucko.luckperms.common.utils.ImmutableCollectors;
 
 import java.io.File;
@@ -121,6 +122,8 @@ public class StorageFactory {
 
     private AbstractDao makeDao(StorageType method) {
         switch (method) {
+            case CUSTOM:
+                return StorageProviders.getProvider().provide(this.plugin);
             case MARIADB:
                 return new SqlDao(
                         this.plugin,

common/src/main/java/me/lucko/luckperms/common/storage/StorageType.java

@@ -39,7 +39,8 @@ public enum StorageType {
     MYSQL("MySQL", "mysql"),
     POSTGRESQL("PostgreSQL", "postgresql"),
     SQLITE("SQLite", "sqlite"),
-    H2("H2", "h2");
+    H2("H2", "h2"),
+    CUSTOM("Custom", "custom");
 
     private final String name;
 

common/src/main/java/me/lucko/luckperms/common/storage/provider/StorageProvider.java

@@ -0,0 +1,39 @@
+/*
+ * 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.storage.provider;
+
+import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
+import me.lucko.luckperms.common.storage.dao.AbstractDao;
+
+/**
+ * A storage provider
+ */
+@FunctionalInterface
+public interface StorageProvider {
+
+    AbstractDao provide(LuckPermsPlugin plugin);
+
+}

common/src/main/java/me/lucko/luckperms/common/storage/provider/StorageProviders.java

@@ -0,0 +1,45 @@
+/*
+ * 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.storage.provider;
+
+public final class StorageProviders {
+    private static StorageProvider provider = null;
+
+    public static void register(StorageProvider provider) {
+        StorageProviders.provider = provider;
+    }
+
+    public static StorageProvider getProvider() {
+        if (provider == null) {
+            throw new IllegalStateException("Provider not present.");
+        }
+
+        return provider;
+    }
+
+    private StorageProviders() {}
+
+}