Adds NMS module for Spigot v1_20_R1

.github/actions/setup_project_workspace/action.yml

@@ -19,5 +19,5 @@ runs:
 
     - uses: SpraxDev/Action-SpigotMC@v4
       with:
-        versions: 1.18.1, 1.18.2, 1.19, 1.19.2, 1.19.3, 1.19.4
+        versions: 1.18.1, 1.18.2, 1.19, 1.19.2, 1.19.3, 1.19.4, 1.20
         remapped: true

NMS/NMS-v1_20_R1/pom.xml

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.songoda</groupId>
+        <artifactId>SongodaCore-Modules</artifactId>
+        <version>2.6.22</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+    <artifactId>SongodaCore-NMS-v1_20_R1</artifactId>
+
+    <properties>
+        <java.version>17</java.version>
+        <java.release>17</java.release>
+
+        <nms.ver>1.20-R0.1-SNAPSHOT</nms.ver>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>net.md-5</groupId>
+                <artifactId>specialsource-maven-plugin</artifactId>
+                <version>1.2.4</version>
+
+                <executions>
+                    <execution>
+                        <id>remap-obf</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>remap</goal>
+                        </goals>
+
+                        <configuration>
+                            <srgIn>org.spigotmc:minecraft-server:${nms.ver}:txt:maps-mojang</srgIn>
+                            <reverse>true</reverse>
+                            <remappedDependencies>org.spigotmc:spigot:${nms.ver}:jar:remapped-mojang</remappedDependencies>
+                            <remappedArtifactAttached>true</remappedArtifactAttached>
+                            <remappedClassifierName>remapped-obf</remappedClassifierName>
+                        </configuration>
+                    </execution>
+
+                    <execution>
+                        <id>remap-spigot</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>remap</goal>
+                        </goals>
+
+                        <configuration>
+                            <inputFile>${project.build.directory}/${project.artifactId}-${project.version}-remapped-obf.jar</inputFile>
+                            <srgIn>org.spigotmc:minecraft-server:${nms.ver}:csrg:maps-spigot</srgIn>
+                            <remappedDependencies>org.spigotmc:spigot:${nms.ver}:jar:remapped-obf</remappedDependencies>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <!--suppress VulnerableLibrariesLocal -->
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot</artifactId>
+            <version>${nms.ver}</version>
+            <classifier>remapped-mojang</classifier>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>SongodaCore-NMS-API</artifactId>
+            <version>${project.version}</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>SongodaCore-Compatibility</artifactId>
+            <version>${project.version}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/NmsImplementationsImpl.java

@@ -0,0 +1,54 @@
+package com.songoda.core.nms.v1_20_R1;
+
+import com.songoda.core.nms.NmsImplementations;
+import com.songoda.core.nms.anvil.AnvilCore;
+import com.songoda.core.nms.entity.NMSPlayer;
+import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.v1_20_R1.entity.NMSPlayerImpl;
+import com.songoda.core.nms.v1_20_R1.nbt.NBTCoreImpl;
+import com.songoda.core.nms.v1_20_R1.world.NmsWorldBorderImpl;
+import com.songoda.core.nms.v1_20_R1.world.WorldCoreImpl;
+import com.songoda.core.nms.world.NmsWorldBorder;
+import com.songoda.core.nms.world.WorldCore;
+import org.jetbrains.annotations.NotNull;
+
+public class NmsImplementationsImpl implements NmsImplementations {
+    private final NMSPlayer player;
+    private final WorldCore world;
+    private final NmsWorldBorder worldBorder;
+    private final AnvilCore anvil;
+    private final NBTCore nbt;
+
+    public NmsImplementationsImpl() {
+        this.player = new NMSPlayerImpl();
+        this.world = new WorldCoreImpl();
+        this.worldBorder = new NmsWorldBorderImpl();
+        this.anvil = new com.songoda.core.nms.v1_20_R1.anvil.AnvilCore();
+        this.nbt = new NBTCoreImpl();
+    }
+
+    @Override
+    public @NotNull NMSPlayer getPlayer() {
+        return this.player;
+    }
+
+    @Override
+    public @NotNull WorldCore getWorld() {
+        return this.world;
+    }
+
+    @Override
+    public @NotNull NmsWorldBorder getWorldBorder() {
+        return this.worldBorder;
+    }
+
+    @Override
+    public @NotNull AnvilCore getAnvil() {
+        return this.anvil;
+    }
+
+    @Override
+    public @NotNull NBTCore getNbt() {
+        return this.nbt;
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/anvil/AnvilCore.java

@@ -0,0 +1,21 @@
+package com.songoda.core.nms.v1_20_R1.anvil;
+
+import com.songoda.core.nms.anvil.CustomAnvil;
+import net.minecraft.server.level.ServerPlayer;
+import org.bukkit.craftbukkit.v1_20_R1.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.InventoryHolder;
+
+public class AnvilCore implements com.songoda.core.nms.anvil.AnvilCore {
+    @Override
+    public CustomAnvil createAnvil(Player player) {
+        ServerPlayer p = ((CraftPlayer) player).getHandle();
+        return new AnvilView(p.nextContainerCounter(), p, null);
+    }
+
+    @Override
+    public CustomAnvil createAnvil(Player player, InventoryHolder holder) {
+        ServerPlayer p = ((CraftPlayer) player).getHandle();
+        return new AnvilView(p.nextContainerCounter(), p, holder);
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/anvil/AnvilInventoryCustom.java

@@ -0,0 +1,22 @@
+package com.songoda.core.nms.v1_20_R1.anvil;
+
+import net.minecraft.world.Container;
+import net.minecraft.world.inventory.AnvilMenu;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_20_R1.inventory.CraftInventoryAnvil;
+import org.bukkit.inventory.InventoryHolder;
+
+public class AnvilInventoryCustom extends CraftInventoryAnvil {
+    final InventoryHolder holder;
+
+    public AnvilInventoryCustom(InventoryHolder holder, Location location, Container inventory, Container resultInventory, AnvilMenu container) {
+        super(location, inventory, resultInventory, container);
+
+        this.holder = holder;
+    }
+
+    @Override
+    public InventoryHolder getHolder() {
+        return this.holder;
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/anvil/AnvilView.java

@@ -0,0 +1,216 @@
+package com.songoda.core.nms.v1_20_R1.anvil;
+
+import com.songoda.core.nms.anvil.CustomAnvil;
+import com.songoda.core.nms.anvil.methods.AnvilTextChange;
+import net.md_5.bungee.api.chat.TranslatableComponent;
+import net.minecraft.core.BlockPos;
+import net.minecraft.network.chat.MutableComponent;
+import net.minecraft.network.chat.contents.TranslatableContents;
+import net.minecraft.network.protocol.game.ClientboundOpenScreenPacket;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.Container;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.inventory.AbstractContainerMenu;
+import net.minecraft.world.inventory.AnvilMenu;
+import net.minecraft.world.inventory.ContainerLevelAccess;
+import net.minecraft.world.inventory.ItemCombinerMenu;
+import net.minecraft.world.inventory.MenuType;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_20_R1.inventory.CraftInventoryView;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+
+import java.lang.reflect.Field;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class AnvilView extends AnvilMenu implements CustomAnvil {
+    private final ServerPlayer entity;
+    private final Inventory inventory;
+    private String customTitle = "Repairing";
+    private int cost = -1;
+    private boolean canUse = true;
+    private AnvilTextChange textChange;
+
+    // used for setting custom inventory
+    static Field mc_ContainerAnvil_repairInventory; // subcontainer with only the result
+    static Field mc_ContainerAnvil_resultInventory; // full inventory
+    static Field mc_ContainerAnvil_bukkitEntity;
+
+    static {
+        try {
+            mc_ContainerAnvil_repairInventory = ItemCombinerMenu.class.getDeclaredField("q");
+            mc_ContainerAnvil_repairInventory.setAccessible(true);
+
+            mc_ContainerAnvil_resultInventory = ItemCombinerMenu.class.getDeclaredField("r");
+            mc_ContainerAnvil_resultInventory.setAccessible(true);
+
+            mc_ContainerAnvil_bukkitEntity = AnvilMenu.class.getDeclaredField("bukkitEntity");
+            mc_ContainerAnvil_bukkitEntity.setAccessible(true);
+        } catch (Exception ex) {
+            Logger.getLogger(AnvilView.class.getName()).log(Level.SEVERE, "Anvil Setup Error", ex);
+        }
+    }
+
+    // 1.14 also introduced a title field, also private, which can only be set once and can't be checked
+    static Field mc_Container_title;
+
+    static {
+        try {
+            mc_Container_title = AbstractContainerMenu.class.getDeclaredField("title");
+            mc_Container_title.setAccessible(true);
+        } catch (Exception ex) {
+            Logger.getLogger(AnvilView.class.getName()).log(Level.SEVERE, "Anvil Setup Error", ex);
+        }
+    }
+
+    public AnvilView(int id, ServerPlayer entity, InventoryHolder holder) {
+        super(entity.nextContainerCounter(), entity.getInventory(), ContainerLevelAccess.create(entity.level(), new BlockPos(0, 0, 0)));
+
+        this.setTitle(MutableComponent.create(new TranslatableContents(this.customTitle != null ? this.customTitle : "", this.customTitle != null ? this.customTitle : "", new Object[0])));
+        this.checkReachable = false;
+        this.entity = entity;
+
+        if (holder != null) {
+            this.inventory = getBukkitView(entity, holder).getTopInventory();
+        } else {
+            this.inventory = getBukkitView().getTopInventory();
+        }
+    }
+
+    public CraftInventoryView getBukkitView(Player player, InventoryHolder holder) {
+        try {
+            AnvilInventoryCustom craftInventory = new AnvilInventoryCustom(holder,
+                    new Location(entity.level().getWorld(), 0, 0, 0),
+                    (Container) mc_ContainerAnvil_repairInventory.get(this),
+                    (Container) mc_ContainerAnvil_resultInventory.get(this), this);
+            CraftInventoryView view = new CraftInventoryView(player.getBukkitEntity(), craftInventory, this);
+            mc_ContainerAnvil_bukkitEntity.set(this, view);
+
+            return view;
+        } catch (Exception ex) {
+            Logger.getLogger(AnvilView.class.getName()).log(Level.SEVERE, "Anvil Setup Error", ex);
+        }
+
+        return getBukkitView();
+    }
+
+    @Override
+    public boolean stillValid(Player entityHuman) {
+        return canUse;
+    }
+
+    @Override
+    public void broadcastFullState() {
+        super.broadcastFullState();
+
+        if (cost >= 0) {
+            this.setLevelCost(cost);
+        }
+
+        textChange.onChange();
+    }
+
+    @Override
+    public void update() {
+        broadcastFullState();
+    }
+
+    @Override
+    public String getRenameText() {
+        return this.itemName;
+    }
+
+    @Override
+    public void setRenameText(String text) {
+        this.setItemName(text);
+    }
+
+    @Override
+    public void setOnChange(AnvilTextChange handler) {
+        textChange = handler;
+    }
+
+    @Override
+    public String getCustomTitle() {
+        return customTitle;
+    }
+
+    @Override
+    public void setCustomTitle(String title) {
+        this.customTitle = title;
+
+        try {
+            mc_Container_title.set(this, MutableComponent.create(new TranslatableContents(this.customTitle != null ? this.customTitle : "", this.customTitle != null ? this.customTitle : "", new Object[0])));
+        } catch (Exception ex) {
+            Logger.getLogger(AnvilView.class.getName()).log(Level.SEVERE, "Anvil Error", ex);
+        }
+    }
+
+    @Override
+    public void setLevelCost(int cost) {
+        this.cost = cost;
+    }
+
+    @Override
+    public int getLevelCost() {
+        if (cost >= 0) {
+            return cost;
+        }
+
+        return this.getLevelCost();
+    }
+
+    @Override
+    public void setCanUse(boolean bool) {
+        this.canUse = bool;
+    }
+
+    @Override
+    public ItemStack getLeftInput() {
+        return inventory.getItem(0);
+    }
+
+    @Override
+    public ItemStack getRightInput() {
+        return inventory.getItem(1);
+    }
+
+    @Override
+    public ItemStack getOutput() {
+        return inventory.getItem(2);
+    }
+
+    @Override
+    public void setLeftInput(ItemStack item) {
+        inventory.setItem(0, item);
+    }
+
+    @Override
+    public void setRightInput(ItemStack item) {
+        inventory.setItem(1, item);
+    }
+
+    @Override
+    public void setOutput(ItemStack item) {
+        inventory.setItem(2, item);
+    }
+
+    @Override
+    public Inventory getInventory() {
+        return inventory;
+    }
+
+    @Override
+    public void open() {
+        // Send the packet
+        entity.connection.send(new ClientboundOpenScreenPacket(super.containerId, MenuType.ANVIL, MutableComponent.create(new TranslatableContents(this.customTitle != null ? this.customTitle : "", this.customTitle != null ? this.customTitle : "", new Object[0]))));
+
+        // Set their active container to this anvil
+        entity.containerMenu = this;
+
+        // Add the slot listener
+        entity.initMenu(entity.containerMenu);
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/entity/NMSPlayerImpl.java

@@ -0,0 +1,13 @@
+package com.songoda.core.nms.v1_20_R1.entity;
+
+import com.songoda.core.nms.entity.NMSPlayer;
+import net.minecraft.network.protocol.Packet;
+import org.bukkit.craftbukkit.v1_20_R1.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+
+public class NMSPlayerImpl implements NMSPlayer {
+    @Override
+    public void sendPacket(Player p, Object packet) {
+        ((CraftPlayer) p).getHandle().connection.send((Packet<?>) packet);
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/nbt/NBTCompoundImpl.java

@@ -0,0 +1,208 @@
+package com.songoda.core.nms.v1_20_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTCompound;
+import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtIo;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Set;
+import java.util.UUID;
+
+public class NBTCompoundImpl implements NBTCompound {
+    protected CompoundTag compound;
+
+    protected NBTCompoundImpl(CompoundTag compound) {
+        this.compound = compound;
+    }
+
+    public NBTCompoundImpl() {
+        this.compound = new CompoundTag();
+    }
+
+    @Override
+    public NBTCompound set(String tag, String s) {
+        this.compound.putString(tag, s);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, boolean b) {
+        this.compound.putBoolean(tag, b);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, int i) {
+        this.compound.putInt(tag, i);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, double i) {
+        this.compound.putDouble(tag, i);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, long l) {
+        this.compound.putLong(tag, l);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, short s) {
+        this.compound.putShort(tag, s);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, byte b) {
+        this.compound.putByte(tag, b);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, int[] i) {
+        this.compound.putIntArray(tag, i);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, byte[] b) {
+        this.compound.putByteArray(tag, b);
+        return this;
+    }
+
+    @Override
+    public NBTCompound set(String tag, UUID u) {
+        this.compound.putUUID(tag, u);
+        return this;
+    }
+
+    @Override
+    public NBTCompound remove(String tag) {
+        this.compound.remove(tag);
+        return this;
+    }
+
+    @Override
+    public boolean has(String tag) {
+        return this.compound.contains(tag);
+    }
+
+    @Override
+    public NBTObject getNBTObject(String tag) {
+        return new NBTObjectImpl(this.compound, tag);
+    }
+
+    @Override
+    public String getString(String tag) {
+        return getNBTObject(tag).asString();
+    }
+
+    @Override
+    public boolean getBoolean(String tag) {
+        return getNBTObject(tag).asBoolean();
+    }
+
+    @Override
+    public int getInt(String tag) {
+        return getNBTObject(tag).asInt();
+    }
+
+    @Override
+    public double getDouble(String tag) {
+        return getNBTObject(tag).asDouble();
+    }
+
+    @Override
+    public long getLong(String tag) {
+        return getNBTObject(tag).asLong();
+    }
+
+    @Override
+    public short getShort(String tag) {
+        return getNBTObject(tag).asShort();
+    }
+
+    @Override
+    public byte getByte(String tag) {
+        return getNBTObject(tag).asByte();
+    }
+
+    @Override
+    public int[] getIntArray(String tag) {
+        return getNBTObject(tag).asIntArray();
+    }
+
+    @Override
+    public byte[] getByteArray(String tag) {
+        return getNBTObject(tag).asByteArray();
+    }
+
+    @Override
+    public NBTCompound getCompound(String tag) {
+        if (has(tag)) {
+            return getNBTObject(tag).asCompound();
+        }
+
+        CompoundTag newCompound = new CompoundTag();
+        this.compound.put(tag, newCompound);
+        return new NBTCompoundImpl(newCompound);
+    }
+
+    @Override
+    public Set<String> getKeys() {
+        return this.compound.getAllKeys();
+    }
+
+    @Override
+    public Set<String> getKeys(String tag) {
+        return this.compound.getCompound(tag).getAllKeys();
+    }
+
+    @Override
+    public byte[] serialize(String... exclusions) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+             ObjectOutputStream dataOutput = new ObjectOutputStream(outputStream)) {
+            addExtras();
+            CompoundTag compound = this.compound.copy();
+
+            for (String exclusion : exclusions) {
+                compound.remove(exclusion);
+            }
+
+            NbtIo.writeCompressed(compound, dataOutput);
+
+            return outputStream.toByteArray();
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+
+        return null;
+    }
+
+    @Override
+    public void deSerialize(byte[] serialized) {
+        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(serialized);
+             ObjectInputStream dataInput = new ObjectInputStream(inputStream)) {
+            this.compound = NbtIo.readCompressed(dataInput);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+    }
+
+    @Override
+    public void addExtras() {
+        // None
+    }
+
+    @Override
+    public String toString() {
+        return this.compound.toString();
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/nbt/NBTCoreImpl.java

@@ -0,0 +1,38 @@
+package com.songoda.core.nms.v1_20_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.nbt.NBTEntity;
+import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.nbt.CompoundTag;
+import org.bukkit.craftbukkit.v1_20_R1.entity.CraftEntity;
+import org.bukkit.craftbukkit.v1_20_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
+import org.bukkit.inventory.ItemStack;
+
+public class NBTCoreImpl implements NBTCore {
+    @Deprecated
+    @Override
+    public NBTItem of(ItemStack item) {
+        return new NBTItemImpl(CraftItemStack.asNMSCopy(item));
+    }
+
+    @Deprecated
+    @Override
+    public NBTItem newItem() {
+        return new NBTItemImpl(null);
+    }
+
+    @Override
+    public NBTEntity of(Entity entity) {
+        net.minecraft.world.entity.Entity nmsEntity = ((CraftEntity) entity).getHandle();
+        CompoundTag nbt = new CompoundTag();
+        nmsEntity.saveWithoutId(nbt);
+
+        return new NBTEntityImpl(nbt, nmsEntity);
+    }
+
+    @Override
+    public NBTEntity newEntity() {
+        return new NBTEntityImpl(new CompoundTag(), null);
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/nbt/NBTEntityImpl.java

@@ -0,0 +1,66 @@
+package com.songoda.core.nms.v1_20_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTEntity;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.MobSpawnType;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_20_R1.CraftWorld;
+
+import java.util.Optional;
+
+public class NBTEntityImpl extends NBTCompoundImpl implements NBTEntity {
+    private Entity nmsEntity;
+
+    public NBTEntityImpl(CompoundTag entityNBT, Entity nmsEntity) {
+        super(entityNBT);
+
+        this.nmsEntity = nmsEntity;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity spawn(Location location) {
+        String entityType = getNBTObject("entity_type").asString();
+        getKeys().remove("UUID");
+
+        Optional<EntityType<?>> optionalEntity = EntityType.byString(entityType);
+        if (optionalEntity.isPresent()) {
+            assert location.getWorld() != null;
+
+            Entity spawned = optionalEntity.get().spawn(
+                    ((CraftWorld) location.getWorld()).getHandle(),
+                    this.compound,
+                    null,
+                    new BlockPos(location.getBlockX(), location.getBlockY(), location.getBlockZ()),
+                    MobSpawnType.COMMAND,
+                    true,
+                    false
+            );
+
+            if (spawned != null) {
+                spawned.load(this.compound);
+                org.bukkit.entity.Entity entity = spawned.getBukkitEntity();
+                entity.teleport(location);
+                this.nmsEntity = spawned;
+
+                return entity;
+            }
+        }
+
+        return null;
+    }
+
+    @Override
+    public org.bukkit.entity.Entity reSpawn(Location location) {
+        this.nmsEntity.discard();
+        return spawn(location);
+    }
+
+    @Override
+    public void addExtras() {
+        this.compound.putString("entity_type", BuiltInRegistries.ENTITY_TYPE.getKey(this.nmsEntity.getType()).toString());
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/nbt/NBTItemImpl.java

@@ -0,0 +1,24 @@
+package com.songoda.core.nms.v1_20_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTItem;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.item.ItemStack;
+import org.bukkit.craftbukkit.v1_20_R1.inventory.CraftItemStack;
+
+public class NBTItemImpl extends NBTCompoundImpl implements NBTItem {
+    private final ItemStack nmsItem;
+
+    public NBTItemImpl(ItemStack nmsItem) {
+        super(nmsItem != null && nmsItem.hasTag() ? nmsItem.getTag() : new CompoundTag());
+
+        this.nmsItem = nmsItem;
+    }
+
+    public org.bukkit.inventory.ItemStack finish() {
+        if (this.nmsItem == null) {
+            return CraftItemStack.asBukkitCopy(ItemStack.of(this.compound));
+        }
+
+        return CraftItemStack.asBukkitCopy(this.nmsItem);
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/nbt/NBTObjectImpl.java

@@ -0,0 +1,72 @@
+package com.songoda.core.nms.v1_20_R1.nbt;
+
+import com.songoda.core.nms.nbt.NBTCompound;
+import com.songoda.core.nms.nbt.NBTObject;
+import net.minecraft.nbt.CompoundTag;
+
+import java.util.Set;
+
+public class NBTObjectImpl implements NBTObject {
+    private final CompoundTag compound;
+    private final String tag;
+
+    public NBTObjectImpl(CompoundTag compound, String tag) {
+        this.compound = compound;
+        this.tag = tag;
+    }
+
+    @Override
+    public String asString() {
+        return this.compound.getString(this.tag);
+    }
+
+    @Override
+    public boolean asBoolean() {
+        return this.compound.getBoolean(this.tag);
+    }
+
+    @Override
+    public int asInt() {
+        return this.compound.getInt(this.tag);
+    }
+
+    @Override
+    public double asDouble() {
+        return this.compound.getDouble(this.tag);
+    }
+
+    @Override
+    public long asLong() {
+        return this.compound.getLong(this.tag);
+    }
+
+    @Override
+    public short asShort() {
+        return this.compound.getShort(this.tag);
+    }
+
+    @Override
+    public byte asByte() {
+        return this.compound.getByte(this.tag);
+    }
+
+    @Override
+    public int[] asIntArray() {
+        return this.compound.getIntArray(this.tag);
+    }
+
+    @Override
+    public byte[] asByteArray() {
+        return this.compound.getByteArray(this.tag);
+    }
+
+    @Override
+    public NBTCompound asCompound() {
+        return new NBTCompoundImpl(this.compound.getCompound(this.tag));
+    }
+
+    @Override
+    public Set<String> getKeys() {
+        return this.compound.getAllKeys();
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/world/NmsWorldBorderImpl.java

@@ -0,0 +1,34 @@
+package com.songoda.core.nms.v1_20_R1.world;
+
+import com.songoda.core.nms.world.NmsWorldBorder;
+import net.minecraft.network.protocol.game.ClientboundInitializeBorderPacket;
+import net.minecraft.world.level.border.WorldBorder;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_20_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_20_R1.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+
+import java.util.Objects;
+
+public class NmsWorldBorderImpl implements NmsWorldBorder {
+    @Override
+    public void send(Player player, BorderColor color, double size, Location center) {
+        Objects.requireNonNull(center.getWorld());
+
+        WorldBorder worldBorder = new WorldBorder();
+        worldBorder.world = ((CraftWorld) center.getWorld()).getHandle();
+
+        worldBorder.setCenter(center.getX(), center.getZ());
+        worldBorder.setSize(size);
+        worldBorder.setWarningTime(0);
+        worldBorder.setWarningBlocks(0);
+
+        if (color == BorderColor.GREEN) {
+            worldBorder.lerpSizeBetween(size - 0.1D, size, Long.MAX_VALUE);
+        } else if (color == BorderColor.RED) {
+            worldBorder.lerpSizeBetween(size, size - 1.0D, Long.MAX_VALUE);
+        }
+
+        ((CraftPlayer) player).getHandle().connection.send(new ClientboundInitializeBorderPacket(worldBorder));
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/world/SItemStackImpl.java

@@ -0,0 +1,39 @@
+package com.songoda.core.nms.v1_20_R1.world;
+
+import com.songoda.core.nms.world.SItemStack;
+import net.minecraft.core.particles.ItemParticleOption;
+import net.minecraft.core.particles.ParticleTypes;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.phys.Vec3;
+import org.bukkit.craftbukkit.v1_20_R1.entity.CraftPlayer;
+import org.bukkit.craftbukkit.v1_20_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+public class SItemStackImpl implements SItemStack {
+    private final ItemStack item;
+
+    public SItemStackImpl(ItemStack item) {
+        this.item = item;
+    }
+
+    @Override
+    public void breakItem(Player player, int amount) {
+        ServerPlayer entityPlayer = ((CraftPlayer) player).getHandle();
+
+        for (int i = 0; i < amount; ++i) {
+            Vec3 vec3d = new Vec3(((double) random.nextFloat() - 0.5D) * 0.1D, Math.random() * 0.1D + 0.1D, 0.0D);
+            vec3d = vec3d.xRot(-entityPlayer.getXRot() * 0.017453292F);
+            vec3d = vec3d.yRot(-entityPlayer.getYRot() * 0.017453292F);
+
+            double d0 = (double) (-random.nextFloat()) * 0.6D - 0.3D;
+
+            Vec3 vec3d1 = new Vec3(((double) random.nextFloat() - 0.5D) * 0.3D, d0, 0.6D);
+            vec3d1 = vec3d1.xRot(-entityPlayer.getXRot() * 0.017453292F);
+            vec3d1 = vec3d1.yRot(-entityPlayer.getYRot() * 0.017453292F);
+            vec3d1 = vec3d1.add(entityPlayer.getX(), entityPlayer.getEyeY(), entityPlayer.getZ());
+
+            entityPlayer.level().addParticle(new ItemParticleOption(ParticleTypes.ITEM, CraftItemStack.asNMSCopy(this.item)), vec3d1.x, vec3d1.y, vec3d1.z, vec3d.x, vec3d.y + 0.05D, vec3d.z);
+        }
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/world/SSpawnerImpl.java

@@ -0,0 +1,132 @@
+package com.songoda.core.nms.v1_20_R1.world;
+
+import com.songoda.core.compatibility.CompatibleMaterial;
+import com.songoda.core.compatibility.CompatibleParticleHandler;
+import com.songoda.core.nms.world.SSpawner;
+import com.songoda.core.nms.world.SpawnedEntity;
+import net.minecraft.core.BlockPos;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.util.RandomSource;
+import net.minecraft.world.DifficultyInstance;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.Mob;
+import net.minecraft.world.entity.MobSpawnType;
+import net.minecraft.world.level.SpawnData;
+import org.bukkit.Location;
+import org.bukkit.block.BlockFace;
+import org.bukkit.craftbukkit.v1_20_R1.CraftWorld;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.util.Optional;
+import java.util.Set;
+
+public class SSpawnerImpl implements SSpawner {
+    private final Location spawnerLocation;
+
+    public SSpawnerImpl(Location location) {
+        this.spawnerLocation = location;
+    }
+
+    @Override
+    public LivingEntity spawnEntity(EntityType type, Location spawnerLocation) {
+        return spawnEntity(type, "EXPLOSION_NORMAL", null, null);
+    }
+
+    @Override
+    public LivingEntity spawnEntity(EntityType type, String particleType, SpawnedEntity spawned, Set<CompatibleMaterial> canSpawnOn) {
+        SpawnData data = new SpawnData();
+        CompoundTag compound = data.getEntityToSpawn();
+
+        String name = type.name().toLowerCase().replace("snowman", "snow_golem")
+                .replace("mushroom_cow", "mooshroom");
+        compound.putString("id", "minecraft:" + name);
+
+        short spawnRange = 4;
+        for (int i = 0; i < 50; i++) {
+            assert this.spawnerLocation.getWorld() != null;
+            ServerLevel world = ((CraftWorld) this.spawnerLocation.getWorld()).getHandle();
+
+            RandomSource random = world.getRandom();
+            double x = this.spawnerLocation.getX() + (random.nextDouble() - random.nextDouble()) * (double) spawnRange + 0.5D;
+            double y = this.spawnerLocation.getY() + random.nextInt(3) - 1;
+            double z = this.spawnerLocation.getZ() + (random.nextDouble() - random.nextDouble()) * (double) spawnRange + 0.5D;
+
+            Optional<Entity> optionalEntity = net.minecraft.world.entity.EntityType.create(compound, world);
+            if (optionalEntity.isEmpty()) continue;
+
+            Entity entity = optionalEntity.get();
+            entity.setPos(x, y, z);
+
+            BlockPos position = entity.blockPosition();
+            DifficultyInstance damageScaler = world.getCurrentDifficultyAt(position);
+
+            if (!(entity instanceof Mob entityInsentient)) {
+                continue;
+            }
+
+            Location spot = new Location(this.spawnerLocation.getWorld(), x, y, z);
+
+            if (!canSpawn(world, entityInsentient, spot, canSpawnOn)) {
+                continue;
+            }
+
+            entityInsentient.finalizeSpawn(world, damageScaler, MobSpawnType.SPAWNER, null, null);
+
+            LivingEntity craftEntity = (LivingEntity) entity.getBukkitEntity();
+
+            if (spawned != null && !spawned.onSpawn(craftEntity)) {
+                return null;
+            }
+
+            if (particleType != null) {
+                float xx = (float) (0 + (Math.random() * 1));
+                float yy = (float) (0 + (Math.random() * 2));
+                float zz = (float) (0 + (Math.random() * 1));
+
+                CompatibleParticleHandler.spawnParticles(CompatibleParticleHandler.ParticleType.getParticle(particleType), spot, 5, xx, yy, zz, 0);
+            }
+
+            world.addFreshEntity(entity, CreatureSpawnEvent.SpawnReason.SPAWNER);
+
+            spot.setYaw(random.nextFloat() * 360.0F);
+            craftEntity.teleport(spot);
+
+            return craftEntity;
+        }
+
+        return null;
+    }
+
+    private boolean canSpawn(ServerLevel world, Mob entityInsentient, Location location, Set<CompatibleMaterial> canSpawnOn) {
+        if (!world.noCollision(entityInsentient, entityInsentient.getBoundingBox())) {
+            return false;
+        }
+
+        CompatibleMaterial spawnedIn = CompatibleMaterial.getMaterial(location.getBlock());
+        CompatibleMaterial spawnedOn = CompatibleMaterial.getMaterial(location.getBlock().getRelative(BlockFace.DOWN));
+
+        if (spawnedIn == null || spawnedOn == null) {
+            return false;
+        }
+
+        if (!spawnedIn.isAir() &&
+                spawnedIn != CompatibleMaterial.WATER &&
+                !spawnedIn.name().contains("PRESSURE") &&
+                !spawnedIn.name().contains("SLAB")) {
+            return false;
+        }
+
+        for (CompatibleMaterial material : canSpawnOn) {
+            if (material == null) continue;
+
+            if (spawnedOn == material || material.isAir()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/world/SWorldImpl.java

@@ -0,0 +1,52 @@
+package com.songoda.core.nms.v1_20_R1.world;
+
+import com.songoda.core.nms.world.SWorld;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.entity.LevelEntityGetter;
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.craftbukkit.v1_20_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_20_R1.block.data.CraftBlockData;
+import org.bukkit.entity.LivingEntity;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SWorldImpl implements SWorld {
+    private final World world;
+
+    public SWorldImpl(World world) {
+        this.world = world;
+    }
+
+    @Override
+    public List<LivingEntity> getLivingEntities() {
+        List<LivingEntity> result = new ArrayList<>();
+
+        ServerLevel worldServer = ((CraftWorld) this.world).getHandle();
+        LevelEntityGetter<Entity> entities = worldServer.getEntities();
+
+        entities.getAll().forEach((mcEnt) -> {
+            org.bukkit.entity.Entity bukkitEntity = mcEnt.getBukkitEntity();
+
+            if (bukkitEntity instanceof LivingEntity && bukkitEntity.isValid()) {
+                result.add((LivingEntity) bukkitEntity);
+            }
+        });
+
+        return result;
+    }
+
+    @Override
+    public void setBlockFast(int x, int y, int z, Material material) {
+        ServerLevel serverLevel = ((CraftWorld) this.world).getHandle();
+        LevelChunk levelChunk = serverLevel.getChunk(x >> 4, z >> 4);
+        BlockState blockState = ((CraftBlockData) material.createBlockData()).getState();
+
+        levelChunk.setBlockState(new BlockPos(x & 0xF, y, z & 0xF), blockState, true);
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/world/WorldCoreImpl.java

@@ -0,0 +1,110 @@
+package com.songoda.core.nms.v1_20_R1.world;
+
+import com.songoda.core.nms.ReflectionUtils;
+import com.songoda.core.nms.v1_20_R1.world.spawner.BBaseSpawnerImpl;
+import com.songoda.core.nms.world.BBaseSpawner;
+import com.songoda.core.nms.world.SItemStack;
+import com.songoda.core.nms.world.SSpawner;
+import com.songoda.core.nms.world.SWorld;
+import com.songoda.core.nms.world.WorldCore;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.SectionPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.util.profiling.ProfilerFiller;
+import net.minecraft.world.level.BaseSpawner;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.ChunkStatus;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.chunk.LevelChunkSection;
+import net.minecraft.world.level.material.FluidState;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+import org.bukkit.block.CreatureSpawner;
+import org.bukkit.craftbukkit.v1_20_R1.CraftChunk;
+import org.bukkit.craftbukkit.v1_20_R1.block.CraftBlock;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+public class WorldCoreImpl implements WorldCore {
+    @Override
+    public SSpawner getSpawner(CreatureSpawner spawner) {
+        return new SSpawnerImpl(spawner.getLocation());
+    }
+
+    @Override
+    public SSpawner getSpawner(Location location) {
+        return new SSpawnerImpl(location);
+    }
+
+    @Override
+    public SItemStack getItemStack(ItemStack item) {
+        return new SItemStackImpl(item);
+    }
+
+    @Override
+    public SWorld getWorld(World world) {
+        return new SWorldImpl(world);
+    }
+
+    @Override
+    public BBaseSpawner getBaseSpawner(CreatureSpawner spawner) throws NoSuchFieldException, NoSuchMethodException, IllegalAccessException {
+        Object cTileEntity = ReflectionUtils.getFieldValue(spawner, "tileEntity");
+
+        return new BBaseSpawnerImpl(spawner, (BaseSpawner) ReflectionUtils.getFieldValue(cTileEntity, "a"));
+    }
+
+    /**
+     * Method is based on {@link ServerLevel#tickChunk(LevelChunk, int)}.
+     */
+    @Override
+    public void randomTickChunk(org.bukkit.Chunk bukkitChunk, int tickAmount) {
+        LevelChunk chunk = (LevelChunk) ((CraftChunk) bukkitChunk).getHandle(ChunkStatus.FULL);
+        ServerLevel world = chunk.r;
+        ProfilerFiller gameProfilerFiller = world.getProfiler();
+
+        ChunkPos chunkPos = chunk.getPos();
+        int j = chunkPos.getMinBlockX();
+        int k = chunkPos.getMinBlockZ();
+
+        gameProfilerFiller.push("tickBlocks");
+        if (tickAmount > 0) {
+            LevelChunkSection[] aChunkSection = chunk.getSections();
+
+            for (int j1 = 0; j1 < aChunkSection.length; ++j1) {
+                LevelChunkSection chunkSection = aChunkSection[j1];
+                if (chunkSection.isRandomlyTicking()) {
+                    int l = chunk.getSectionYFromSectionIndex(j1);
+                    int k1 = SectionPos.sectionToBlockCoord(l);
+
+                    for (int i1 = 0; i1 < tickAmount; ++i1) {
+                        BlockPos blockposition2 = world.getBlockRandomPos(j, k1, k, 15);
+                        gameProfilerFiller.push("randomTick");
+                        BlockState iblockdata3 = chunkSection.getBlockState(blockposition2.getX() - j, blockposition2.getY() - k1, blockposition2.getZ() - k);
+                        if (iblockdata3.isRandomlyTicking()) {
+                            iblockdata3.randomTick(world, blockposition2, world.random);
+                        }
+
+                        FluidState fluid = iblockdata3.getFluidState();
+                        if (fluid.isRandomlyTicking()) {
+                            fluid.randomTick(world, blockposition2, world.random);
+                        }
+
+                        gameProfilerFiller.pop();
+                    }
+                }
+            }
+        }
+
+        gameProfilerFiller.pop();
+    }
+
+    @Override
+    public void updateAdjacentComparators(@NotNull Block bukkitBlock) {
+        CraftBlock craftBlock = (CraftBlock) bukkitBlock;
+        ServerLevel serverLevel = craftBlock.getCraftWorld().getHandle();
+
+        serverLevel.updateNeighbourForOutputSignal(craftBlock.getPosition(), craftBlock.getNMS().getBlock());
+    }
+}

NMS/NMS-v1_20_R1/src/main/java/com/songoda/core/nms/v1_20_R1/world/spawner/BBaseSpawnerImpl.java

@@ -0,0 +1,215 @@
+package com.songoda.core.nms.v1_20_R1.world.spawner;
+
+import com.songoda.core.nms.world.BBaseSpawner;
+import net.minecraft.core.BlockPos;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.util.RandomSource;
+import net.minecraft.util.random.WeightedEntry;
+import net.minecraft.world.Difficulty;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.Mob;
+import net.minecraft.world.entity.MobSpawnType;
+import net.minecraft.world.entity.SpawnPlacements;
+import net.minecraft.world.level.BaseSpawner;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.LightLayer;
+import net.minecraft.world.level.SpawnData;
+import net.minecraft.world.level.gameevent.GameEvent;
+import net.minecraft.world.phys.AABB;
+import org.bukkit.block.CreatureSpawner;
+import org.bukkit.craftbukkit.v1_20_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_20_R1.block.CraftCreatureSpawner;
+import org.bukkit.craftbukkit.v1_20_R1.event.CraftEventFactory;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Optional;
+
+public class BBaseSpawnerImpl implements BBaseSpawner {
+    private final CreatureSpawner bukkitSpawner;
+    private final BaseSpawner spawner;
+
+    private final Method setNextSpawnDataMethod;
+    private final Method getOrCreateNextSpawnDataMethod;
+
+    public BBaseSpawnerImpl(CreatureSpawner bukkitSpawner, BaseSpawner spawner) throws NoSuchMethodException {
+        this.bukkitSpawner = bukkitSpawner;
+        this.spawner = spawner;
+
+        this.setNextSpawnDataMethod = this.spawner.getClass().getDeclaredMethod("a", Level.class, BlockPos.class, SpawnData.class);
+        if (!this.setNextSpawnDataMethod.canAccess(this.spawner)) {
+            this.setNextSpawnDataMethod.setAccessible(true);
+        }
+
+        this.getOrCreateNextSpawnDataMethod = this.spawner.getClass().getSuperclass().getDeclaredMethod("b", Level.class, RandomSource.class, BlockPos.class);
+        if (!this.getOrCreateNextSpawnDataMethod.canAccess(this.spawner)) {
+            this.getOrCreateNextSpawnDataMethod.setAccessible(true);
+        }
+    }
+
+    /**
+     * This method is based on {@link BaseSpawner#isNearPlayer(Level, BlockPos)}.
+     */
+    @SuppressWarnings("JavadocReference")
+    @Override
+    public boolean isNearPlayer() {
+        BlockPos bPos = getBlockPosition();
+        return getWorld().hasNearbyAlivePlayer(
+                (double) bPos.getX() + 0.5,
+                (double) bPos.getY() + 0.5,
+                (double) bPos.getZ() + 0.5,
+                this.spawner.requiredPlayerRange
+        );
+    }
+
+    /**
+     * This method is based on {@link BaseSpawner#serverTick(ServerLevel, BlockPos)}.
+     */
+    @Override
+    public void tick() throws InvocationTargetException, IllegalAccessException {
+        ServerLevel worldServer = getWorld();
+        BlockPos blockposition = getBlockPosition();
+
+        if (this.spawner.spawnDelay == -1) {
+            this.delay(worldServer, blockposition);
+        }
+
+        if (this.spawner.spawnDelay > 0) {
+            --this.spawner.spawnDelay;
+            return;
+        }
+
+        boolean flag = false;
+        RandomSource randomsource = worldServer.getRandom();
+        SpawnData mobSpawnerData = (SpawnData) this.getOrCreateNextSpawnDataMethod.invoke(this.spawner, worldServer, randomsource, blockposition);
+        int i = 0;
+
+        while (true) {
+            if (i >= this.spawner.spawnCount) {
+                if (flag) {
+                    this.delay(worldServer, blockposition);
+                }
+                break;
+            }
+
+            CompoundTag nbttagcompound = mobSpawnerData.getEntityToSpawn();
+            Optional<EntityType<?>> optional = EntityType.by(nbttagcompound);
+            if (optional.isEmpty()) {
+                this.delay(worldServer, blockposition);
+                return;
+            }
+
+            ListTag nbttaglist = nbttagcompound.getList("Pos", 6);
+            int j = nbttaglist.size();
+            double d0 = j >= 1 ? nbttaglist.getDouble(0) : (double) blockposition.getX() + (randomsource.nextDouble() - randomsource.nextDouble()) * (double) this.spawner.spawnRange + 0.5;
+            double d1 = j >= 2 ? nbttaglist.getDouble(1) : (double) (blockposition.getY() + randomsource.nextInt(3) - 1);
+            double d2 = j >= 3 ? nbttaglist.getDouble(2) : (double) blockposition.getZ() + (randomsource.nextDouble() - randomsource.nextDouble()) * (double) this.spawner.spawnRange + 0.5;
+            if (worldServer.noCollision(optional.get().getAABB(d0, d1, d2))) {
+                label128:
+                {
+                    BlockPos blockposition1 = BlockPos.containing(d0, d1, d2);
+                    if (mobSpawnerData.getCustomSpawnRules().isPresent()) {
+                        if (!optional.get().getCategory().isFriendly() && worldServer.getDifficulty() == Difficulty.PEACEFUL) {
+                            break label128;
+                        }
+
+                        SpawnData.CustomSpawnRules mobspawnerdata_a = mobSpawnerData.getCustomSpawnRules().get();
+                        if (!mobspawnerdata_a.blockLightLimit().isValueInRange(worldServer.getBrightness(LightLayer.BLOCK, blockposition1)) || !mobspawnerdata_a.skyLightLimit().isValueInRange(worldServer.getBrightness(LightLayer.SKY, blockposition1))) {
+                            break label128;
+                        }
+                    } else if (!SpawnPlacements.checkSpawnRules((EntityType<?>) optional.get(), worldServer, MobSpawnType.SPAWNER, blockposition1, worldServer.getRandom())) {
+                        break label128;
+                    }
+
+                    Entity entity = EntityType.loadEntityRecursive(nbttagcompound, worldServer, (entity1) -> {
+                        entity1.moveTo(d0, d1, d2, entity1.getYRot(), entity1.getXRot());
+                        return entity1;
+                    });
+                    if (entity == null) {
+                        this.delay(worldServer, blockposition);
+                        return;
+                    }
+
+                    int k = worldServer.getEntitiesOfClass(entity.getClass(), (new AABB(blockposition.getX(), blockposition.getY(), blockposition.getZ(), blockposition.getX() + 1, blockposition.getY() + 1, blockposition.getZ() + 1)).inflate(this.spawner.spawnRange)).size();
+                    if (k >= this.spawner.maxNearbyEntities) {
+                        this.delay(worldServer, blockposition);
+                        return;
+                    }
+
+                    entity.moveTo(entity.getX(), entity.getY(), entity.getZ(), randomsource.nextFloat() * 360.0F, 0.0F);
+                    if (entity instanceof Mob entityInsentient) {
+                        if (mobSpawnerData.getCustomSpawnRules().isEmpty() && !entityInsentient.checkSpawnRules(worldServer, MobSpawnType.SPAWNER) || !entityInsentient.checkSpawnObstruction(worldServer)) {
+                            break label128;
+                        }
+
+                        if (mobSpawnerData.getEntityToSpawn().size() == 1 && mobSpawnerData.getEntityToSpawn().contains("id", 8)) {
+                            ((Mob) entity).finalizeSpawn(worldServer, worldServer.getCurrentDifficultyAt(entity.blockPosition()), MobSpawnType.SPAWNER, null, null);
+                        }
+
+                        if (entityInsentient.level().spigotConfig.nerfSpawnerMobs) {
+                            entityInsentient.aware = false;
+                        }
+                    }
+
+                    if (CraftEventFactory.callSpawnerSpawnEvent(entity, blockposition).isCancelled()) {
+                        Entity vehicle = entity.getVehicle();
+                        if (vehicle != null) {
+                            vehicle.discard();
+                        }
+
+                        for (Entity passenger : entity.getIndirectPassengers()) {
+                            passenger.discard();
+                        }
+                    } else {
+                        if (!worldServer.tryAddFreshEntityWithPassengers(entity, CreatureSpawnEvent.SpawnReason.SPAWNER)) {
+                            this.delay(worldServer, blockposition);
+                            return;
+                        }
+
+                        worldServer.levelEvent(2004, blockposition, 0);
+                        worldServer.gameEvent(entity, GameEvent.ENTITY_PLACE, blockposition1);
+                        if (entity instanceof Mob) {
+                            ((Mob) entity).spawnAnim();
+                        }
+
+                        flag = true;
+                    }
+                }
+            }
+
+            ++i;
+        }
+    }
+
+    /**
+     * This method is based on {@link BaseSpawner#delay(Level, BlockPos)}.
+     */
+    @SuppressWarnings("JavadocReference")
+    private void delay(ServerLevel world, BlockPos bPos) throws InvocationTargetException, IllegalAccessException {
+        RandomSource randomsource = world.random;
+        if (this.spawner.maxSpawnDelay <= this.spawner.minSpawnDelay) {
+            this.spawner.spawnDelay = this.spawner.minSpawnDelay;
+        } else {
+            this.spawner.spawnDelay = this.spawner.minSpawnDelay + randomsource.nextInt(this.spawner.maxSpawnDelay - this.spawner.minSpawnDelay);
+        }
+
+        Optional<WeightedEntry.Wrapper<SpawnData>> weightedEntry = this.spawner.spawnPotentials.getRandom(randomsource);
+        if (weightedEntry.isPresent()) {
+            this.setNextSpawnDataMethod.invoke(this.spawner, world, bPos, weightedEntry.get().getData());
+        }
+
+        this.spawner.broadcastEvent(world, bPos, 1);
+    }
+
+    private ServerLevel getWorld() {
+        return ((CraftWorld) this.bukkitSpawner.getWorld()).getHandle();
+    }
+
+    private BlockPos getBlockPosition() {
+        return ((CraftCreatureSpawner) this.bukkitSpawner).getPosition();
+    }
+}

NMS/NMS/pom.xml

@@ -147,5 +147,11 @@
             <groupId>${project.groupId}</groupId>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <version>${project.version}</version>
+            <artifactId>SongodaCore-NMS-v1_20_R1</artifactId>
+            <groupId>${project.groupId}</groupId>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 </project>

pom.xml

@@ -48,6 +48,7 @@
         <module>NMS/NMS-v1_19_R1</module>
         <module>NMS/NMS-v1_19_R2</module>
         <module>NMS/NMS-v1_19_R3</module>
+        <module>NMS/NMS-v1_20_R1</module>
     </modules>
 
     <issueManagement>