Entity tracker and rewriter cleanup (#1464)

common/src/main/java/us/myles/ViaVersion/api/rewriters/MetadataRewriter.java

@@ -1,20 +1,31 @@
 package us.myles.ViaVersion.api.rewriters;
 
+import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.protocol.Protocol;
+import us.myles.ViaVersion.api.remapper.PacketHandler;
+import us.myles.ViaVersion.api.remapper.PacketRemapper;
+import us.myles.ViaVersion.api.storage.EntityTracker;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.packets.State;
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.logging.Logger;
 
-public abstract class MetadataRewriter<T extends EntityType> {
+public abstract class MetadataRewriter<T extends Protocol> extends Rewriter<T> {
+    private final Class<? extends EntityTracker> entityTrackerClass;
 
-    public final void handleMetadata(int entityId, T type, List<Metadata> metadatas, UserConnection connection) {
+    protected MetadataRewriter(T protocol, Class<? extends EntityTracker> entityTrackerClass) {
+        super(protocol);
+        this.entityTrackerClass = entityTrackerClass;
+        protocol.put(this);
+    }
+
+    public final void handleMetadata(int entityId, List<Metadata> metadatas, UserConnection connection) {
+        EntityType type = connection.get(entityTrackerClass).getEntity(entityId);
         Map<Integer, Metadata> metadataMap = new HashMap<>(metadatas.size());
         for (Metadata metadata : metadatas) {
             metadataMap.put(metadata.getId(), metadata);
@@ -41,9 +52,77 @@ public abstract class MetadataRewriter<T extends EntityType> {
         }
     }
 
-    protected void handleMetadata(int entityId, T type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) throws Exception {}
+    public void registerMetadataRewriter(int oldPacketId, int newPacketId, Type<List<Metadata>> oldMetaType, Type<List<Metadata>> newMetaType) {
+        getProtocol().registerOutgoing(State.PLAY, oldPacketId, newPacketId, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                if (oldMetaType != null) {
+                    map(oldMetaType, newMetaType);
+                } else {
+                    map(newMetaType);
+                }
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int entityId = wrapper.get(Type.VAR_INT, 0);
+                        List<Metadata> metadata = wrapper.get(newMetaType, 0);
+                        handleMetadata(entityId, metadata, wrapper.user());
+                    }
+                });
+            }
+        });
+    }
 
-    protected void handleMetadata(int entityId, T type, Metadata metadata, List<Metadata> metadatas, Map<Integer, Metadata> metadataMap, UserConnection connection) throws Exception {
+    public void registerMetadataRewriter(int oldPacketId, int newPacketId, Type<List<Metadata>> metaType) {
+        registerMetadataRewriter(oldPacketId, newPacketId, null, metaType);
+    }
+
+    public void registerExtraTracker(int packetId, EntityType entityType, Type intType) {
+        getProtocol().registerOutgoing(State.PLAY, packetId, packetId, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(intType); // 0 - Entity id
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        wrapper.user().get(entityTrackerClass).addEntity((int) wrapper.get(intType, 0), entityType);
+                    }
+                });
+            }
+        });
+    }
+
+    public void registerExtraTracker(int packetId, EntityType entityType) {
+        registerExtraTracker(packetId, entityType, Type.VAR_INT);
+    }
+
+    public void registerEntityDestroy(int oldPacketId, int newPacketId) {
+        getProtocol().registerOutgoing(State.PLAY, oldPacketId, newPacketId, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT_ARRAY); // 0 - Entity ids
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        EntityTracker entityTracker = wrapper.user().get(entityTrackerClass);
+                        for (int entity : wrapper.get(Type.VAR_INT_ARRAY, 0)) {
+                            entityTracker.removeEntity(entity);
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    public void registerEntityDestroy(int packetId) {
+        registerEntityDestroy(packetId, packetId);
+    }
+
+    protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) throws Exception {
+    }
+
+    protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, Map<Integer, Metadata> metadataMap, UserConnection connection) throws Exception {
         handleMetadata(entityId, type, metadata, metadatas, connection);
     }
 }

common/src/main/java/us/myles/ViaVersion/api/rewriters/Rewriter.java

@@ -0,0 +1,15 @@
+package us.myles.ViaVersion.api.rewriters;
+
+import us.myles.ViaVersion.api.protocol.Protocol;
+
+public abstract class Rewriter<T extends Protocol> {
+    protected final T protocol;
+
+    protected Rewriter(T protocol) {
+        this.protocol = protocol;
+    }
+
+    public T getProtocol() {
+        return protocol;
+    }
+}

common/src/main/java/us/myles/ViaVersion/api/storage/EntityTracker.java

@@ -6,15 +6,14 @@ import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.EntityType;
 
 import java.util.Map;
-import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 
-public abstract class EntityTracker<T extends EntityType> extends StoredObject implements ExternalJoinGameListener {
+public abstract class EntityTracker extends StoredObject implements ExternalJoinGameListener {
-    private final Map<Integer, T> clientEntityTypes = new ConcurrentHashMap<>();
+    private final Map<Integer, EntityType> clientEntityTypes = new ConcurrentHashMap<>();
+    private final EntityType playerType;
     private int clientEntityId;
-    private final T playerType;
 
-    protected EntityTracker(UserConnection user, T playerType) {
+    protected EntityTracker(UserConnection user, EntityType playerType) {
         super(user);
         this.playerType = playerType;
     }
@@ -23,7 +22,7 @@ public abstract class EntityTracker<T extends EntityType> extends StoredObject i
         clientEntityTypes.remove(entityId);
     }
 
-    public void addEntity(int entityId, T type) {
+    public void addEntity(int entityId, EntityType type) {
         clientEntityTypes.put(entityId, type);
     }
 
@@ -31,8 +30,8 @@ public abstract class EntityTracker<T extends EntityType> extends StoredObject i
         return clientEntityTypes.containsKey(entityId);
     }
 
-    public Optional<T> getEntity(int entityId) {
+    public EntityType getEntity(int entityId) {
-        return Optional.ofNullable(clientEntityTypes.get(entityId));
+        return clientEntityTypes.get(entityId);
     }
 
     @Override

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_11to1_10/Protocol1_11To1_10.java

@@ -21,8 +21,6 @@ import us.myles.ViaVersion.protocols.protocol1_11to1_10.storage.EntityTracker1_1
 import us.myles.ViaVersion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
 import us.myles.ViaVersion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
 
-import java.util.Optional;
-
 public class Protocol1_11To1_10 extends Protocol {
     private static final ValueTransformer<Float, Short> toOldByte = new ValueTransformer<Float, Short>(Type.UNSIGNED_BYTE) {
         @Override
@@ -33,7 +31,7 @@ public class Protocol1_11To1_10 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_11To1_10());
+        MetadataRewriter1_11To1_10 metadataRewriter = new MetadataRewriter1_11To1_10(this);
 
         InventoryPackets.register(this);
 
@@ -93,7 +91,7 @@ public class Protocol1_11To1_10 extends Protocol {
 
                             // Register Type ID
                             wrapper.user().get(EntityTracker1_11.class).addEntity(entityId, entType);
-                            get(MetadataRewriter1_11To1_10.class).handleMetadata(entityId, entType, wrapper.get(Types1_9.METADATA_LIST, 0), wrapper.user());
+                            metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_9.METADATA_LIST, 0), wrapper.user());
                         }
                     }
                 });
@@ -143,25 +141,7 @@ public class Protocol1_11To1_10 extends Protocol {
         });
 
         // Metadata packet
-        registerOutgoing(State.PLAY, 0x39, 0x39, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x39, 0x39, Types1_9.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_9.METADATA_LIST); // 1 - Metadata list
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
-
-                        Optional<Entity1_11Types.EntityType> type = wrapper.user().get(EntityTracker1_11.class).getEntity(entityId);
-                        if (!type.isPresent())
-                            return;
-
-                        get(MetadataRewriter1_11To1_10.class).handleMetadata(entityId, type.get(), wrapper.get(Types1_9.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
 
         // Entity teleport
         registerOutgoing(State.PLAY, 0x49, 0x49, new PacketRemapper() {
@@ -193,20 +173,7 @@ public class Protocol1_11To1_10 extends Protocol {
         });
 
         // Destroy entities
-        registerOutgoing(State.PLAY, 0x30, 0x30, new PacketRemapper() {
+        metadataRewriter.registerEntityDestroy(0x30);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT_ARRAY); // 0 - Entity IDS
-
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (int entity : wrapper.get(Type.VAR_INT_ARRAY, 0))
-                            wrapper.user().get(EntityTracker1_11.class).removeEntity(entity);
-                    }
-                });
-            }
-        });
 
         // Title packet
         registerOutgoing(State.PLAY, 0x45, 0x45, new PacketRemapper() {
@@ -416,7 +383,9 @@ public class Protocol1_11To1_10 extends Protocol {
 
     @Override
     public void init(UserConnection userConnection) {
+        // Entity tracker
         userConnection.put(new EntityTracker1_11(userConnection));
+
         if (!userConnection.has(ClientWorld.class))
             userConnection.put(new ClientWorld(userConnection));
     }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_11to1_10/metadata/MetadataRewriter1_11To1_10.java

@@ -17,15 +17,20 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 
-public class MetadataRewriter1_11To1_10 extends MetadataRewriter<EntityType> {
+public class MetadataRewriter1_11To1_10 extends MetadataRewriter<Protocol1_11To1_10> {
+
+    public MetadataRewriter1_11To1_10(Protocol1_11To1_10 protocol) {
+        super(protocol, EntityTracker1_11.class);
+    }
 
     @Override
-    protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, Map<Integer, Metadata> metadataMap, UserConnection connection) {
+    protected void handleMetadata(int entityId, us.myles.ViaVersion.api.entities.EntityType type, Metadata metadata, List<Metadata> metadatas, Map<Integer, Metadata> metadataMap, UserConnection connection) {
         if (metadata.getValue() instanceof Item) {
             // Apply rewrite
             EntityIdRewriter.toClientItem((Item) metadata.getValue());
         }
 
+        if (type == null) return;
         if (type.is(EntityType.ELDER_GUARDIAN) || type.is(EntityType.GUARDIAN)) { // Guardians
             int oldid = metadata.getId();
             if (oldid == 12) {

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_11to1_10/storage/EntityTracker1_11.java

@@ -2,13 +2,12 @@ package us.myles.ViaVersion.protocols.protocol1_11to1_10.storage;
 
 import com.google.common.collect.Sets;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_11Types;
 import us.myles.ViaVersion.api.entities.Entity1_11Types.EntityType;
 import us.myles.ViaVersion.api.storage.EntityTracker;
 
 import java.util.Set;
 
-public class EntityTracker1_11 extends EntityTracker<Entity1_11Types.EntityType> {
+public class EntityTracker1_11 extends EntityTracker {
     private final Set<Integer> holograms = Sets.newConcurrentHashSet();
 
     public EntityTracker1_11(UserConnection user) {

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_12to1_11_1/Protocol1_12To1_11_1.java

@@ -26,13 +26,11 @@ import us.myles.ViaVersion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4
 import us.myles.ViaVersion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.Protocol1_9To1_8;
 
-import java.util.Optional;
-
 public class Protocol1_12To1_11_1 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_12To1_11_1());
+        MetadataRewriter1_12To1_11_1 metadataRewriter = new MetadataRewriter1_12To1_11_1(this);
 
         InventoryPackets.register(this);
         // Outgoing
@@ -89,7 +87,7 @@ public class Protocol1_12To1_11_1 extends Protocol {
                         Entity1_12Types.EntityType entType = Entity1_12Types.getTypeFromId(type, false);
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_12.class).addEntity(entityId, entType);
-                        get(MetadataRewriter1_12To1_11_1.class).handleMetadata(entityId, entType, wrapper.get(Types1_12.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_12.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
@@ -191,22 +189,11 @@ public class Protocol1_12To1_11_1 extends Protocol {
         registerOutgoing(State.PLAY, 0x25, 0x26);
         registerOutgoing(State.PLAY, 0x26, 0x27);
         registerOutgoing(State.PLAY, 0x27, 0x28);
+
         // New packet at 0x30
         // Destroy entities
-        registerOutgoing(State.PLAY, 0x30, 0x31, new PacketRemapper() {
+        metadataRewriter.registerEntityDestroy(0x30, 0x31);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT_ARRAY); // 0 - Entity IDS
 
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (int entity : wrapper.get(Type.VAR_INT_ARRAY, 0))
-                            wrapper.user().get(EntityTracker1_12.class).removeEntity(entity);
-                    }
-                });
-            }
-        });
         registerOutgoing(State.PLAY, 0x31, 0x32);
         registerOutgoing(State.PLAY, 0x32, 0x33);
         // Respawn Packet
@@ -233,26 +220,10 @@ public class Protocol1_12To1_11_1 extends Protocol {
         registerOutgoing(State.PLAY, 0x36, 0x38);
         registerOutgoing(State.PLAY, 0x37, 0x39);
         registerOutgoing(State.PLAY, 0x38, 0x3a);
+
         // Metadata packet
-        registerOutgoing(State.PLAY, 0x39, 0x3b, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x39, 0x3b, Types1_12.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_12.METADATA_LIST); // 1 - Metadata list
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
 
-                        Optional<Entity1_12Types.EntityType> type = wrapper.user().get(EntityTracker1_12.class).getEntity(entityId);
-                        if (!type.isPresent())
-                            return;
-
-                        get(MetadataRewriter1_12To1_11_1.class).handleMetadata(entityId, type.get(), wrapper.get(Types1_12.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
         registerOutgoing(State.PLAY, 0x3a, 0x3c);
         registerOutgoing(State.PLAY, 0x3b, 0x3d);
         // registerOutgoing(State.PLAY, 0x3c, 0x3e); - Handled in InventoryPackets

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_12to1_11_1/metadata/MetadataRewriter1_12To1_11_1.java

@@ -2,15 +2,21 @@ package us.myles.ViaVersion.protocols.protocol1_12to1_11_1.metadata;
 
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.Entity1_12Types;
-import us.myles.ViaVersion.api.entities.Entity1_12Types.EntityType;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
 import us.myles.ViaVersion.api.rewriters.MetadataRewriter;
 import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.BedRewriter;
+import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.Protocol1_12To1_11_1;
+import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.storage.EntityTracker1_12;
 
 import java.util.List;
 
-public class MetadataRewriter1_12To1_11_1 extends MetadataRewriter<Entity1_12Types.EntityType> {
+public class MetadataRewriter1_12To1_11_1 extends MetadataRewriter<Protocol1_12To1_11_1> {
+
+    public MetadataRewriter1_12To1_11_1(Protocol1_12To1_11_1 protocol) {
+        super(protocol, EntityTracker1_12.class);
+    }
 
     @Override
     protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) {
@@ -18,8 +24,10 @@ public class MetadataRewriter1_12To1_11_1 extends MetadataRewriter<Entity1_12Typ
             // Apply rewrite
             BedRewriter.toClientItem((Item) metadata.getValue());
         }
+
+        if (type == null) return;
         // Evocation Illager aggressive property became 13
-        if (type.is(EntityType.EVOCATION_ILLAGER)) {
+        if (type == Entity1_12Types.EntityType.EVOCATION_ILLAGER) {
             if (metadata.getId() == 12) {
                 metadata.setId(13);
             }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_12to1_11_1/storage/EntityTracker1_12.java

@@ -1,11 +1,10 @@
 package us.myles.ViaVersion.protocols.protocol1_12to1_11_1.storage;
 
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_12Types;
 import us.myles.ViaVersion.api.entities.Entity1_12Types.EntityType;
 import us.myles.ViaVersion.api.storage.EntityTracker;
 
-public class EntityTracker1_12 extends EntityTracker<Entity1_12Types.EntityType> {
+public class EntityTracker1_12 extends EntityTracker {
 
     public EntityTracker1_12(UserConnection user) {
         super(user, EntityType.PLAYER);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_1to1_13/Protocol1_13_1To1_13.java

@@ -20,7 +20,7 @@ public class Protocol1_13_1To1_13 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_13_1To1_13());
+        new MetadataRewriter1_13_1To1_13(this);
 
         EntityPackets.register(this);
         InventoryPackets.register(this);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_1to1_13/metadata/MetadataRewriter1_13_1To1_13.java

@@ -2,17 +2,22 @@ package us.myles.ViaVersion.protocols.protocol1_13_1to1_13.metadata;
 
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.Entity1_13Types;
-import us.myles.ViaVersion.api.entities.Entity1_13Types.EntityType;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
 import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13;
 import us.myles.ViaVersion.api.rewriters.MetadataRewriter;
 import us.myles.ViaVersion.protocols.protocol1_13_1to1_13.Protocol1_13_1To1_13;
 import us.myles.ViaVersion.protocols.protocol1_13_1to1_13.packets.InventoryPackets;
+import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.storage.EntityTracker1_13;
 
 import java.util.List;
 
-public class MetadataRewriter1_13_1To1_13 extends MetadataRewriter<Entity1_13Types.EntityType> {
+public class MetadataRewriter1_13_1To1_13 extends MetadataRewriter<Protocol1_13_1To1_13> {
+
+    public MetadataRewriter1_13_1To1_13(Protocol1_13_1To1_13 protocol) {
+        super(protocol, EntityTracker1_13.class);
+    }
 
     @Override
     protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) {
@@ -27,13 +32,13 @@ public class MetadataRewriter1_13_1To1_13 extends MetadataRewriter<Entity1_13Typ
 
         if (type == null) return;
 
-        if (type.isOrHasParent(EntityType.MINECART_ABSTRACT) && metadata.getId() == 9) {
+        if (type.isOrHasParent(Entity1_13Types.EntityType.MINECART_ABSTRACT) && metadata.getId() == 9) {
             // New block format
             int data = (int) metadata.getValue();
             metadata.setValue(Protocol1_13_1To1_13.getNewBlockStateId(data));
         }
 
-        if (type.isOrHasParent(EntityType.ABSTRACT_ARROW) && metadata.getId() >= 7) {
+        if (type.isOrHasParent(Entity1_13Types.EntityType.ABSTRACT_ARROW) && metadata.getId() >= 7) {
             metadata.setId(metadata.getId() + 1); // New shooter UUID
         }
     }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_1to1_13/packets/EntityPackets.java

@@ -12,11 +12,10 @@ import us.myles.ViaVersion.protocols.protocol1_13_1to1_13.Protocol1_13_1To1_13;
 import us.myles.ViaVersion.protocols.protocol1_13_1to1_13.metadata.MetadataRewriter1_13_1To1_13;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.storage.EntityTracker1_13;
 
-import java.util.Optional;
-
 public class EntityPackets {
 
     public static void register(final Protocol protocol) {
+        MetadataRewriter1_13_1To1_13 metadataRewriter = protocol.get(MetadataRewriter1_13_1To1_13.class);
 
         //spawn entity
         protocol.registerOutgoing(State.PLAY, 0x0, 0x0, new PacketRemapper() {
@@ -81,7 +80,7 @@ public class EntityPackets {
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_13.class).addEntity(entityId, entType);
 
-                        protocol.get(MetadataRewriter1_13_1To1_13.class).handleMetadata(entityId, entType, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
@@ -108,45 +107,16 @@ public class EntityPackets {
                         Entity1_13Types.EntityType entType = Entity1_13Types.EntityType.PLAYER;
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_13.class).addEntity(entityId, entType);
-                        protocol.get(MetadataRewriter1_13_1To1_13.class).handleMetadata(entityId, entType, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
         });
+
         // Destroy entities
-        protocol.registerOutgoing(State.PLAY, 0x35, 0x35, new PacketRemapper() {
+        metadataRewriter.registerEntityDestroy(0x35);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT_ARRAY); // 0 - Entity IDS
-
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (int entity : wrapper.get(Type.VAR_INT_ARRAY, 0))
-                            wrapper.user().get(EntityTracker1_13.class).removeEntity(entity);
-                    }
-                });
-            }
-        });
-
 
         // Metadata packet
-        protocol.registerOutgoing(State.PLAY, 0x3F, 0x3F, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x3F, 0x3F, Types1_13.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_13.METADATA_LIST); // 1 - Metadata list
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
-
-                        Optional<Entity1_13Types.EntityType> type = wrapper.user().get(EntityTracker1_13.class).getEntity(entityId);
-                        protocol.get(MetadataRewriter1_13_1To1_13.class).handleMetadata(entityId, type.orElse(null), wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
     }
-
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/Protocol1_13To1_12_2.java

@@ -132,7 +132,7 @@ public class Protocol1_13To1_12_2 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_13To1_12_2());
+        new MetadataRewriter1_13To1_12_2(this);
 
         // Register grouped packet changes
         EntityPackets.register(this);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/metadata/MetadataRewriter1_13To1_12_2.java

@@ -2,21 +2,27 @@ package us.myles.ViaVersion.protocols.protocol1_13to1_12_2.metadata;
 
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.Entity1_13Types;
-import us.myles.ViaVersion.api.entities.Entity1_13Types.EntityType;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
 import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13;
 import us.myles.ViaVersion.api.rewriters.MetadataRewriter;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.ChatRewriter;
+import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.data.Particle;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.data.ParticleRewriter;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.packets.InventoryPackets;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.packets.WorldPackets;
+import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.storage.EntityTracker1_13;
 
 import java.util.List;
 import java.util.Map;
 
-public class MetadataRewriter1_13To1_12_2 extends MetadataRewriter<Entity1_13Types.EntityType> {
+public class MetadataRewriter1_13To1_12_2 extends MetadataRewriter<Protocol1_13To1_12_2> {
+
+    public MetadataRewriter1_13To1_12_2(Protocol1_13To1_12_2 protocol) {
+        super(protocol, EntityTracker1_13.class);
+    }
 
     @Override
     protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, Map<Integer, Metadata> metadataMap, UserConnection connection) throws Exception {
@@ -50,18 +56,18 @@ public class MetadataRewriter1_13To1_12_2 extends MetadataRewriter<Entity1_13Typ
         if (type == null) return;
 
         // Handle new colors
-        if (type.is(EntityType.WOLF) && metadata.getId() == 17) {
+        if (type == Entity1_13Types.EntityType.WOLF && metadata.getId() == 17) {
             metadata.setValue(15 - (int) metadata.getValue());
         }
 
         // Handle new zombie meta (INDEX 15 - Boolean - Zombie is shaking while enabled)
-        if (type.isOrHasParent(EntityType.ZOMBIE)) {
+        if (type.isOrHasParent(Entity1_13Types.EntityType.ZOMBIE)) {
             if (metadata.getId() > 14)
                 metadata.setId(metadata.getId() + 1);
         }
 
         // Handle Minecart inner block
-        if (type.isOrHasParent(EntityType.MINECART_ABSTRACT) && metadata.getId() == 9) {
+        if (type.isOrHasParent(Entity1_13Types.EntityType.MINECART_ABSTRACT) && metadata.getId() == 9) {
             // New block format
             int oldId = (int) metadata.getValue();
             int combined = (((oldId & 4095) << 4) | (oldId >> 12 & 15));
@@ -70,7 +76,7 @@ public class MetadataRewriter1_13To1_12_2 extends MetadataRewriter<Entity1_13Typ
         }
 
         // Handle other changes
-        if (type.is(EntityType.AREA_EFFECT_CLOUD)) {
+        if (type == Entity1_13Types.EntityType.AREA_EFFECT_CLOUD) {
             if (metadata.getId() == 9) {
                 int particleId = (int) metadata.getValue();
                 int parameter1 = metadataMap.containsKey(10) ? (int) metadataMap.get(10).getValue() : 0;

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/EntityPackets.java

@@ -17,7 +17,7 @@ import java.util.Optional;
 
 public class EntityPackets {
     public static void register(final Protocol protocol) {
-        // Outgoing packets
+        MetadataRewriter1_13To1_12_2 metadataRewriter = protocol.get(MetadataRewriter1_13To1_12_2.class);
 
         // Spawn Object
         protocol.registerOutgoing(State.PLAY, 0x0, 0x0, new PacketRemapper() {
@@ -113,7 +113,7 @@ public class EntityPackets {
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_13.class).addEntity(entityId, entType);
 
-                        protocol.get(MetadataRewriter1_13To1_12_2.class).handleMetadata(entityId, entType, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
@@ -140,43 +140,16 @@ public class EntityPackets {
                         Entity1_13Types.EntityType entType = Entity1_13Types.EntityType.PLAYER;
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_13.class).addEntity(entityId, entType);
-                        protocol.get(MetadataRewriter1_13To1_12_2.class).handleMetadata(entityId, entType, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
         });
-        // Destroy entities
-        protocol.registerOutgoing(State.PLAY, 0x32, 0x35, new PacketRemapper() {
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT_ARRAY); // 0 - Entity IDS
 
-                handler(new PacketHandler() {
+        // Destroy entities
-                    @Override
+        metadataRewriter.registerEntityDestroy(0x32, 0x35);
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (int entity : wrapper.get(Type.VAR_INT_ARRAY, 0))
-                            wrapper.user().get(EntityTracker1_13.class).removeEntity(entity);
-                    }
-                });
-            }
-        });
 
         // Metadata packet
-        protocol.registerOutgoing(State.PLAY, 0x3C, 0x3F, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x3C, 0x3F, Types1_12.METADATA_LIST, Types1_13.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_12.METADATA_LIST, Types1_13.METADATA_LIST); // 1 - Metadata list
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
-
-                        Optional<Entity1_13Types.EntityType> type = wrapper.user().get(EntityTracker1_13.class).getEntity(entityId);
-                        protocol.get(MetadataRewriter1_13To1_12_2.class).handleMetadata(entityId, type.orElse(null), wrapper.get(Types1_13.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
     }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/storage/EntityTracker1_13.java

@@ -1,11 +1,10 @@
 package us.myles.ViaVersion.protocols.protocol1_13to1_12_2.storage;
 
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_13Types;
 import us.myles.ViaVersion.api.entities.Entity1_13Types.EntityType;
 import us.myles.ViaVersion.api.storage.EntityTracker;
 
-public class EntityTracker1_13 extends EntityTracker<Entity1_13Types.EntityType> {
+public class EntityTracker1_13 extends EntityTracker {
 
     public EntityTracker1_13(UserConnection user) {
         super(user, EntityType.PLAYER);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14_1to1_14/Protocol1_14_1To1_14.java

@@ -10,7 +10,7 @@ public class Protocol1_14_1To1_14 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_14_1To1_14());
+        new MetadataRewriter1_14_1To1_14(this);
 
         EntityPackets.register(this);
     }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14_1to1_14/metadata/MetadataRewriter1_14_1To1_14.java

@@ -2,18 +2,25 @@ package us.myles.ViaVersion.protocols.protocol1_14_1to1_14.metadata;
 
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.Entity1_14Types;
-import us.myles.ViaVersion.api.entities.Entity1_14Types.EntityType;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
 import us.myles.ViaVersion.api.rewriters.MetadataRewriter;
+import us.myles.ViaVersion.protocols.protocol1_14_1to1_14.Protocol1_14_1To1_14;
+import us.myles.ViaVersion.protocols.protocol1_14_1to1_14.storage.EntityTracker1_14_1;
 
 import java.util.List;
 
-public class MetadataRewriter1_14_1To1_14 extends MetadataRewriter<Entity1_14Types.EntityType> {
+public class MetadataRewriter1_14_1To1_14 extends MetadataRewriter<Protocol1_14_1To1_14> {
 
-    public void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection)  {
+    public MetadataRewriter1_14_1To1_14(Protocol1_14_1To1_14 protocol) {
+        super(protocol, EntityTracker1_14_1.class);
+    }
+
+    @Override
+    public void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) {
         if (type == null) return;
 
-        if (type.is(EntityType.VILLAGER) || type.is(EntityType.WANDERING_TRADER)) {
+        if (type == Entity1_14Types.EntityType.VILLAGER || type == Entity1_14Types.EntityType.WANDERING_TRADER) {
             if (metadata.getId() >= 15) {
                 metadata.setId(metadata.getId() + 1);
             }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14_1to1_14/packets/EntityPackets.java

@@ -11,11 +11,10 @@ import us.myles.ViaVersion.packets.State;
 import us.myles.ViaVersion.protocols.protocol1_14_1to1_14.metadata.MetadataRewriter1_14_1To1_14;
 import us.myles.ViaVersion.protocols.protocol1_14_1to1_14.storage.EntityTracker1_14_1;
 
-import java.util.Optional;
-
 public class EntityPackets {
 
     public static void register(final Protocol protocol) {
+        MetadataRewriter1_14_1To1_14 metadataRewriter = protocol.get(MetadataRewriter1_14_1To1_14.class);
 
         // Spawn Mob
         protocol.registerOutgoing(State.PLAY, 0x03, 0x03, new PacketRemapper() {
@@ -46,7 +45,7 @@ public class EntityPackets {
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_14_1.class).addEntity(entityId, entType);
 
-                        protocol.get(MetadataRewriter1_14_1To1_14.class).handleMetadata(entityId, entType, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
@@ -74,29 +73,13 @@ public class EntityPackets {
 
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_14_1.class).addEntity(entityId, entType);
-                        protocol.get(MetadataRewriter1_14_1To1_14.class).handleMetadata(entityId, entType, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
         });
 
         // Entity Metadata
-        protocol.registerOutgoing(State.PLAY, 0x43, 0x43, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x43, 0x43, Types1_14.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_14.METADATA_LIST); // 1 - Metadata list
-
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
-
-                        Optional<Entity1_14Types.EntityType> type = wrapper.user().get(EntityTracker1_14_1.class).getEntity(entityId);
-                        protocol.get(MetadataRewriter1_14_1To1_14.class).handleMetadata(entityId, type.orElse(null), wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
     }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14_1to1_14/storage/EntityTracker1_14_1.java

@@ -1,11 +1,10 @@
 package us.myles.ViaVersion.protocols.protocol1_14_1to1_14.storage;
 
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_14Types;
 import us.myles.ViaVersion.api.entities.Entity1_14Types.EntityType;
 import us.myles.ViaVersion.api.storage.EntityTracker;
 
-public class EntityTracker1_14_1 extends EntityTracker<Entity1_14Types.EntityType> {
+public class EntityTracker1_14_1 extends EntityTracker {
 
     public EntityTracker1_14_1(UserConnection user) {
         super(user, EntityType.PLAYER);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14to1_13_2/Protocol1_14To1_13_2.java

@@ -25,7 +25,7 @@ public class Protocol1_14To1_13_2 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_14To1_13_2());
+        new MetadataRewriter1_14To1_13_2(this);
 
         InventoryPackets.register(this);
         EntityPackets.register(this);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14to1_13_2/metadata/MetadataRewriter1_14To1_13_2.java

@@ -3,7 +3,7 @@ package us.myles.ViaVersion.protocols.protocol1_14to1_13_2.metadata;
 import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.Entity1_14Types;
-import us.myles.ViaVersion.api.entities.Entity1_14Types.EntityType;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.VillagerData;
 import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
@@ -17,7 +17,11 @@ import us.myles.ViaVersion.protocols.protocol1_14to1_13_2.storage.EntityTracker1
 
 import java.util.List;
 
-public class MetadataRewriter1_14To1_13_2 extends MetadataRewriter<Entity1_14Types.EntityType> {
+public class MetadataRewriter1_14To1_13_2 extends MetadataRewriter<Protocol1_14To1_13_2> {
+
+    public MetadataRewriter1_14To1_13_2(Protocol1_14To1_13_2 protocol) {
+        super(protocol, EntityTracker1_14.class);
+    }
 
     @Override
     protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) throws Exception {
@@ -41,19 +45,19 @@ public class MetadataRewriter1_14To1_13_2 extends MetadataRewriter<Entity1_14Typ
         }
 
         //Metadata 12 added to living_entity
-        if (metadata.getId() > 11 && type.isOrHasParent(EntityType.LIVINGENTITY)) {
+        if (metadata.getId() > 11 && type.isOrHasParent(Entity1_14Types.EntityType.LIVINGENTITY)) {
             metadata.setId(metadata.getId() + 1);
         }
 
-        if (type.isOrHasParent(EntityType.ABSTRACT_INSENTIENT)) {
+        if (type.isOrHasParent(Entity1_14Types.EntityType.ABSTRACT_INSENTIENT)) {
             if (metadata.getId() == 13) {
                 tracker.setInsentientData(entityId, (byte) ((((Number) metadata.getValue()).byteValue() & ~0x4)
-                                                                    | (tracker.getInsentientData(entityId) & 0x4))); // New attacking metadata
+                        | (tracker.getInsentientData(entityId) & 0x4))); // New attacking metadata
                 metadata.setValue(tracker.getInsentientData(entityId));
             }
         }
 
-        if (type.isOrHasParent(EntityType.PLAYER)) {
+        if (type.isOrHasParent(Entity1_14Types.EntityType.PLAYER)) {
             if (entityId != tracker.getClientEntityId()) {
                 if (metadata.getId() == 0) {
                     byte flags = ((Number) metadata.getValue()).byteValue();
@@ -66,10 +70,10 @@ public class MetadataRewriter1_14To1_13_2 extends MetadataRewriter<Entity1_14Typ
                     metadatas.add(new Metadata(6, MetaType1_14.Pose, recalculatePlayerPose(entityId, tracker)));
                 }
             }
-        } else if (type.isOrHasParent(EntityType.ZOMBIE)) {
+        } else if (type.isOrHasParent(Entity1_14Types.EntityType.ZOMBIE)) {
             if (metadata.getId() == 16) {
                 tracker.setInsentientData(entityId, (byte) ((tracker.getInsentientData(entityId) & ~0x4)
-                                                                    | ((boolean) metadata.getValue() ? 0x4 : 0))); // New attacking
+                        | ((boolean) metadata.getValue() ? 0x4 : 0))); // New attacking
                 metadatas.remove(metadata);  // "Are hands held up"
                 metadatas.add(new Metadata(13, MetaType1_14.Byte, tracker.getInsentientData(entityId)));
             } else if (metadata.getId() > 16) {
@@ -77,13 +81,13 @@ public class MetadataRewriter1_14To1_13_2 extends MetadataRewriter<Entity1_14Typ
             }
         }
 
-        if (type.isOrHasParent(EntityType.MINECART_ABSTRACT)) {
+        if (type.isOrHasParent(Entity1_14Types.EntityType.MINECART_ABSTRACT)) {
             if (metadata.getId() == 10) {
                 // New block format
                 int data = (int) metadata.getValue();
                 metadata.setValue(Protocol1_14To1_13_2.getNewBlockStateId(data));
             }
-        } else if (type.is(EntityType.HORSE)) {
+        } else if (type.is(Entity1_14Types.EntityType.HORSE)) {
             if (metadata.getId() == 18) {
                 metadatas.remove(metadata);
 
@@ -103,53 +107,53 @@ public class MetadataRewriter1_14To1_13_2 extends MetadataRewriter<Entity1_14Typ
                 equipmentPacket.write(Type.FLAT_VAR_INT_ITEM, armorItem);
                 equipmentPacket.send(Protocol1_14To1_13_2.class);
             }
-        } else if (type.is(EntityType.VILLAGER)) {
+        } else if (type.is(Entity1_14Types.EntityType.VILLAGER)) {
             if (metadata.getId() == 15) {
                 // plains
                 metadata.setValue(new VillagerData(2, getNewProfessionId((int) metadata.getValue()), 0));
                 metadata.setMetaType(MetaType1_14.VillagerData);
             }
-        } else if (type.is(EntityType.ZOMBIE_VILLAGER)) {
+        } else if (type.is(Entity1_14Types.EntityType.ZOMBIE_VILLAGER)) {
             if (metadata.getId() == 18) {
                 // plains
                 metadata.setValue(new VillagerData(2, getNewProfessionId((int) metadata.getValue()), 0));
                 metadata.setMetaType(MetaType1_14.VillagerData);
             }
-        } else if (type.isOrHasParent(EntityType.ABSTRACT_ARROW)) {
+        } else if (type.isOrHasParent(Entity1_14Types.EntityType.ABSTRACT_ARROW)) {
             if (metadata.getId() >= 9) { // New piercing
                 metadata.setId(metadata.getId() + 1);
             }
-        } else if (type.is(EntityType.FIREWORKS_ROCKET)) {
+        } else if (type.is(Entity1_14Types.EntityType.FIREWORKS_ROCKET)) {
             if (metadata.getId() == 8) {
                 if (metadata.getValue().equals(0))
                     metadata.setValue(null); // https://bugs.mojang.com/browse/MC-111480
                 metadata.setMetaType(MetaType1_14.OptVarInt);
             }
-        } else if (type.isOrHasParent(EntityType.ABSTRACT_SKELETON)) {
+        } else if (type.isOrHasParent(Entity1_14Types.EntityType.ABSTRACT_SKELETON)) {
             if (metadata.getId() == 14) {
                 tracker.setInsentientData(entityId, (byte) ((tracker.getInsentientData(entityId) & ~0x4)
-                                                                    | ((boolean) metadata.getValue() ? 0x4 : 0))); // New attacking
+                        | ((boolean) metadata.getValue() ? 0x4 : 0))); // New attacking
                 metadatas.remove(metadata);  // "Is swinging arms"
                 metadatas.add(new Metadata(13, MetaType1_14.Byte, tracker.getInsentientData(entityId)));
             }
-        } else if (type.is(EntityType.AREA_EFFECT_CLOUD)) {
+        } else if (type.is(Entity1_14Types.EntityType.AREA_EFFECT_CLOUD)) {
             if (metadata.getId() == 10) {
                 Particle particle = (Particle) metadata.getValue();
                 particle.setId(getNewParticleId(particle.getId()));
             }
         }
 
-        if (type.isOrHasParent(EntityType.ABSTRACT_ILLAGER_BASE)) {
+        if (type.isOrHasParent(Entity1_14Types.EntityType.ABSTRACT_ILLAGER_BASE)) {
             if (metadata.getId() == 14) {
                 tracker.setInsentientData(entityId, (byte) ((tracker.getInsentientData(entityId) & ~0x4)
-                                                                    | (((Number) metadata.getValue()).byteValue() != 0 ? 0x4 : 0))); // New attacking
+                        | (((Number) metadata.getValue()).byteValue() != 0 ? 0x4 : 0))); // New attacking
                 metadatas.remove(metadata);  // "Has target (aggressive state)"
                 metadatas.add(new Metadata(13, MetaType1_14.Byte, tracker.getInsentientData(entityId)));
             }
         }
 
         // TODO Are witch and ravager also abstract illagers? They all inherit the new metadata 14 added in 19w13a
-        if (type.is(EntityType.WITCH) || type.is(EntityType.RAVAGER) || type.isOrHasParent(EntityType.ABSTRACT_ILLAGER_BASE)) {
+        if (type.is(Entity1_14Types.EntityType.WITCH) || type.is(Entity1_14Types.EntityType.RAVAGER) || type.isOrHasParent(Entity1_14Types.EntityType.ABSTRACT_ILLAGER_BASE)) {
             if (metadata.getId() >= 14) {  // TODO 19w13 added a new boolean (raid participant - is celebrating) with id 14
                 metadata.setId(metadata.getId() + 1);
             }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14to1_13_2/packets/EntityPackets.java

@@ -20,11 +20,11 @@ import us.myles.ViaVersion.protocols.protocol1_14to1_13_2.storage.EntityTracker1
 
 import java.util.LinkedList;
 import java.util.List;
-import java.util.Optional;
 
 public class EntityPackets {
 
     public static void register(final Protocol protocol) {
+        MetadataRewriter1_14To1_13_2 metadataRewriter = protocol.get(MetadataRewriter1_14To1_13_2.class);
 
         // Spawn entity
         protocol.registerOutgoing(State.PLAY, 0x00, 0x00, new PacketRemapper() {
@@ -135,7 +135,7 @@ public class EntityPackets {
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_14.class).addEntity(entityId, entType);
 
-                        protocol.get(MetadataRewriter1_14To1_13_2.class).handleMetadata(entityId, entType, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
@@ -174,7 +174,7 @@ public class EntityPackets {
                         Entity1_14Types.EntityType entType = Entity1_14Types.EntityType.PLAYER;
                         // Register Type ID
                         wrapper.user().get(EntityTracker1_14.class).addEntity(entityId, entType);
-                        protocol.get(MetadataRewriter1_14To1_13_2.class).handleMetadata(entityId, entType, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
+                        metadataRewriter.handleMetadata(entityId, wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
                     }
                 });
             }
@@ -234,37 +234,9 @@ public class EntityPackets {
         });
 
         // Destroy entities
-        protocol.registerOutgoing(State.PLAY, 0x35, 0x37, new PacketRemapper() {
+        metadataRewriter.registerEntityDestroy(0x35, 0x37);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT_ARRAY); // 0 - Entity IDS
-
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        for (int entity : wrapper.get(Type.VAR_INT_ARRAY, 0))
-                            wrapper.user().get(EntityTracker1_14.class).removeEntity(entity);
-                    }
-                });
-            }
-        });
 
         // Metadata packet
-        protocol.registerOutgoing(State.PLAY, 0x3F, 0x43, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x3F, 0x43, Types1_13_2.METADATA_LIST, Types1_14.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_13_2.METADATA_LIST, Types1_14.METADATA_LIST); // 1 - Metadata list
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
-
-                        Optional<Entity1_14Types.EntityType> type = wrapper.user().get(EntityTracker1_14.class).getEntity(entityId);
-                        protocol.get(MetadataRewriter1_14To1_13_2.class).handleMetadata(entityId, type.orElse(null), wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
     }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14to1_13_2/storage/EntityTracker1_14.java

@@ -4,7 +4,6 @@ import lombok.Getter;
 import lombok.Setter;
 import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_14Types;
 import us.myles.ViaVersion.api.entities.Entity1_14Types.EntityType;
 import us.myles.ViaVersion.api.storage.EntityTracker;
 import us.myles.ViaVersion.api.type.Type;
@@ -14,7 +13,7 @@ import us.myles.ViaVersion.protocols.protocol1_14to1_13_2.packets.WorldPackets;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
-public class EntityTracker1_14 extends EntityTracker<Entity1_14Types.EntityType> {
+public class EntityTracker1_14 extends EntityTracker {
     private final Map<Integer, Byte> insentientData = new ConcurrentHashMap<>();
     // 0x1 = sleeping, 0x2 = riptide
     private final Map<Integer, Byte> sleepingAndRiptideData = new ConcurrentHashMap<>();

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/MetadataRewriter.java

@@ -1,45 +0,0 @@
-package us.myles.ViaVersion.protocols.protocol1_15to1_14_4;
-
-import us.myles.ViaVersion.api.Via;
-import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_15Types;
-import us.myles.ViaVersion.api.minecraft.item.Item;
-import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
-import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_14;
-import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.packets.InventoryPackets;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class MetadataRewriter {
-
-    public static void handleMetadata(int entityId, Entity1_15Types.EntityType type, List<Metadata> metadatas, UserConnection connection) {
-        for (Metadata metadata : new ArrayList<>(metadatas)) {
-            try {
-                if (metadata.getMetaType() == MetaType1_14.Slot) {
-                    InventoryPackets.toClient((Item) metadata.getValue());
-                } else if (metadata.getMetaType() == MetaType1_14.BlockID) {
-                    // Convert to new block id
-                    int data = (int) metadata.getValue();
-                    metadata.setValue(Protocol1_15To1_14_4.getNewBlockStateId(data));
-                }
-
-                if (type == null) continue;
-
-                // Metadata 12 added to abstract_living
-                if (metadata.getId() > 11 && type.isOrHasParent(Entity1_15Types.EntityType.LIVINGENTITY)) {
-                    metadata.setId(metadata.getId() + 1); //TODO is it 11 or 12? what is it for?
-                }
-
-                //TODO new boolean with id 17 for enderman?
-            } catch (Exception e) {
-                metadatas.remove(metadata);
-                if (!Via.getConfig().isSuppressMetadataErrors() || Via.getManager().isDebug()) {
-                    Via.getPlatform().getLogger().warning("An error occurred with entity metadata handler");
-                    Via.getPlatform().getLogger().warning("Metadata: " + metadata);
-                    e.printStackTrace();
-                }
-            }
-        }
-    }
-}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/Protocol1_15To1_14_4.java

@@ -9,6 +9,7 @@ import us.myles.ViaVersion.api.remapper.PacketRemapper;
 import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.packets.State;
 import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.data.MappingData;
+import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.metadata.MetadataRewriter1_15To1_14_4;
 import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.packets.EntityPackets;
 import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.packets.InventoryPackets;
 import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.packets.PlayerPackets;
@@ -20,7 +21,8 @@ public class Protocol1_15To1_14_4 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        MappingData.init();
+        new MetadataRewriter1_15To1_14_4(this);
+
         EntityPackets.register(this);
         PlayerPackets.register(this);
         WorldPackets.register(this);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/metadata/MetadataRewriter1_15To1_14_4.java

@@ -0,0 +1,41 @@
+package us.myles.ViaVersion.protocols.protocol1_15to1_14_4.metadata;
+
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.entities.Entity1_15Types;
+import us.myles.ViaVersion.api.entities.EntityType;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_14;
+import us.myles.ViaVersion.api.rewriters.MetadataRewriter;
+import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.Protocol1_15To1_14_4;
+import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.packets.InventoryPackets;
+import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.storage.EntityTracker1_15;
+
+import java.util.List;
+
+public class MetadataRewriter1_15To1_14_4 extends MetadataRewriter<Protocol1_15To1_14_4> {
+
+    public MetadataRewriter1_15To1_14_4(Protocol1_15To1_14_4 protocol) {
+        super(protocol, EntityTracker1_15.class);
+    }
+
+    @Override
+    public void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, UserConnection connection) throws Exception {
+        if (metadata.getMetaType() == MetaType1_14.Slot) {
+            InventoryPackets.toClient((Item) metadata.getValue());
+        } else if (metadata.getMetaType() == MetaType1_14.BlockID) {
+            // Convert to new block id
+            int data = (int) metadata.getValue();
+            metadata.setValue(Protocol1_15To1_14_4.getNewBlockStateId(data));
+        }
+
+        if (type == null) return;
+
+        // Metadata 12 added to abstract_living
+        if (metadata.getId() > 11 && type.isOrHasParent(Entity1_15Types.EntityType.LIVINGENTITY)) {
+            metadata.setId(metadata.getId() + 1); //TODO is it 11 or 12? what is it for?
+        }
+
+        //TODO new boolean with id 17 for enderman
+    }
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/packets/EntityPackets.java

@@ -8,16 +8,17 @@ import us.myles.ViaVersion.api.remapper.PacketRemapper;
 import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.api.type.types.version.Types1_14;
 import us.myles.ViaVersion.packets.State;
-import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.MetadataRewriter;
 import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.Protocol1_15To1_14_4;
+import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.metadata.MetadataRewriter1_15To1_14_4;
 import us.myles.ViaVersion.protocols.protocol1_15to1_14_4.storage.EntityTracker1_15;
 
-import java.util.Optional;
 import java.util.UUID;
 
 public class EntityPackets {
 
     public static void register(Protocol protocol) {
+        MetadataRewriter1_15To1_14_4 metadataRewriter = protocol.get(MetadataRewriter1_15To1_14_4.class);
+
         // Spawn entity
         protocol.registerOutgoing(State.PLAY, 0x00, 0x00, new PacketRemapper() {
             @Override
@@ -113,21 +114,7 @@ public class EntityPackets {
         });
 
         // Metadata packet
-        protocol.registerOutgoing(State.PLAY, 0x43, 0x44, new PacketRemapper() {
+        metadataRewriter.registerMetadataRewriter(0x43, 0x44, Types1_14.METADATA_LIST);
-            @Override
-            public void registerMap() {
-                map(Type.VAR_INT); // 0 - Entity ID
-                map(Types1_14.METADATA_LIST); // 1 - Metadata list
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        int entityId = wrapper.get(Type.VAR_INT, 0);
-                        Optional<Entity1_15Types.EntityType> type = wrapper.user().get(EntityTracker1_15.class).getEntity(entityId);
-                        MetadataRewriter.handleMetadata(entityId, type.orElse(null), wrapper.get(Types1_14.METADATA_LIST, 0), wrapper.user());
-                    }
-                });
-            }
-        });
     }
 
     public static int getNewEntityId(int oldId) {

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/storage/EntityTracker1_15.java

@@ -1,12 +1,12 @@
 package us.myles.ViaVersion.protocols.protocol1_15to1_14_4.storage;
 
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.entities.Entity1_15Types;
+import us.myles.ViaVersion.api.entities.Entity1_15Types.EntityType;
 import us.myles.ViaVersion.api.storage.EntityTracker;
 
-public class EntityTracker1_15 extends EntityTracker<Entity1_15Types.EntityType> {
+public class EntityTracker1_15 extends EntityTracker {
 
     public EntityTracker1_15(UserConnection user) {
-        super(user, Entity1_15Types.EntityType.PLAYER);
+        super(user, EntityType.PLAYER);
     }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/Protocol1_9To1_8.java

@@ -73,7 +73,7 @@ public class Protocol1_9To1_8 extends Protocol {
 
     @Override
     protected void registerPackets() {
-        put(new MetadataRewriter1_9To1_8());
+        new MetadataRewriter1_9To1_8(this);
 
         // Disconnect workaround (JSON!)
         registerOutgoing(State.LOGIN, 0x00, 0x00, new PacketRemapper() {

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/metadata/MetaIndex.java

@@ -3,6 +3,7 @@ package us.myles.ViaVersion.protocols.protocol1_9to1_8.metadata;
 import lombok.Getter;
 import us.myles.ViaVersion.api.Pair;
 import us.myles.ViaVersion.api.entities.Entity1_10Types;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_8;
 import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_9;
 
@@ -146,14 +147,14 @@ public enum MetaIndex {
 
     static {
         for (MetaIndex index : MetaIndex.values())
-            metadataRewrites.put(new Pair<>(index.getClazz(), index.getIndex()), index);
+            metadataRewrites.put(new Pair<>(index.clazz, index.index), index);
     }
 
-    private Entity1_10Types.EntityType clazz;
+    private final Entity1_10Types.EntityType clazz;
-    private int newIndex;
+    private final int newIndex;
-    private MetaType1_9 newType;
+    private final MetaType1_9 newType;
-    private MetaType1_8 oldType;
+    private final MetaType1_8 oldType;
-    private int index;
+    private final int index;
 
     MetaIndex(Entity1_10Types.EntityType type, int index, MetaType1_8 oldType, MetaType1_9 newType) {
         this.clazz = type;
@@ -171,13 +172,13 @@ public enum MetaIndex {
         this.newType = newType;
     }
 
-    private static Optional<MetaIndex> getIndex(Entity1_10Types.EntityType type, int index) {
+    private static Optional<MetaIndex> getIndex(EntityType type, int index) {
         Pair pair = new Pair<>(type, index);
         return Optional.ofNullable(metadataRewrites.get(pair));
     }
 
-    public static MetaIndex searchIndex(Entity1_10Types.EntityType type, int index) {
+    public static MetaIndex searchIndex(EntityType type, int index) {
-        Entity1_10Types.EntityType currentType = type;
+        EntityType currentType = type;
         do {
             Optional<MetaIndex> optMeta = getIndex(currentType, index);
 

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/metadata/MetadataRewriter1_9To1_8.java

@@ -2,7 +2,7 @@ package us.myles.ViaVersion.protocols.protocol1_9to1_8.metadata;
 
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.entities.Entity1_10Types;
-import us.myles.ViaVersion.api.entities.Entity1_10Types.EntityType;
+import us.myles.ViaVersion.api.entities.EntityType;
 import us.myles.ViaVersion.api.minecraft.EulerAngle;
 import us.myles.ViaVersion.api.minecraft.Vector;
 import us.myles.ViaVersion.api.minecraft.item.Item;
@@ -13,12 +13,17 @@ import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_9;
 import us.myles.ViaVersion.api.rewriters.MetadataRewriter;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.ItemRewriter;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.Protocol1_9To1_8;
+import us.myles.ViaVersion.protocols.protocol1_9to1_8.storage.EntityTracker1_9;
 
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 
-public class MetadataRewriter1_9To1_8 extends MetadataRewriter<Entity1_10Types.EntityType> {
+public class MetadataRewriter1_9To1_8 extends MetadataRewriter<Protocol1_9To1_8> {
+
+    public MetadataRewriter1_9To1_8(Protocol1_9To1_8 protocol) {
+        super(protocol, EntityTracker1_9.class);
+    }
 
     @Override
     protected void handleMetadata(int entityId, EntityType type, Metadata metadata, List<Metadata> metadatas, Map<Integer, Metadata> metadataMap, UserConnection connection) throws Exception {
@@ -35,7 +40,7 @@ public class MetadataRewriter1_9To1_8 extends MetadataRewriter<Entity1_10Types.E
         metadata.setId(metaIndex.getNewIndex());
         metadata.setMetaType(metaIndex.getNewType());
 
-        if (type == EntityType.ENDERMAN && metaIndex.getNewType() == MetaType1_9.BlockID) {
+        if (type == Entity1_10Types.EntityType.ENDERMAN && metaIndex.getNewType() == MetaType1_9.BlockID) {
             if (metaIndex.getOldType() == MetaType1_8.Short) {
                 int id = (Short) metadata.getValue();
                 int data = metadataMap.containsKey(17) ? (Byte) metadataMap.get(17).getValue() : 0;
@@ -58,7 +63,7 @@ public class MetadataRewriter1_9To1_8 extends MetadataRewriter<Entity1_10Types.E
                     metadata.setValue(((Integer) value).byteValue());
                 }
                 // After writing the last one
-                if (metaIndex == MetaIndex.ENTITY_STATUS && type == EntityType.PLAYER) {
+                if (metaIndex == MetaIndex.ENTITY_STATUS && type == Entity1_10Types.EntityType.PLAYER) {
                     Byte val = 0;
                     if ((((Byte) value) & 0x10) == 0x10) { // Player eating/aiming/drinking
                         val = 1;
@@ -74,7 +79,8 @@ public class MetadataRewriter1_9To1_8 extends MetadataRewriter<Entity1_10Types.E
                 if (!owner.isEmpty()) {
                     try {
                         toWrite = UUID.fromString(owner);
-                    } catch (Exception ignored) {}
+                    } catch (Exception ignored) {
+                    }
                 }
                 metadata.setValue(toWrite);
                 break;

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/EntityPackets.java

@@ -5,7 +5,6 @@ import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.Pair;
 import us.myles.ViaVersion.api.Triple;
 import us.myles.ViaVersion.api.Via;
-import us.myles.ViaVersion.api.entities.Entity1_10Types;
 import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
 import us.myles.ViaVersion.api.protocol.Protocol;
@@ -193,9 +192,8 @@ public class EntityPackets {
                         List<Metadata> metadataList = wrapper.get(Types1_9.METADATA_LIST, 0);
                         int entityId = wrapper.get(Type.VAR_INT, 0);
                         EntityTracker1_9 tracker = wrapper.user().get(EntityTracker1_9.class);
-                        Optional<Entity1_10Types.EntityType> type = tracker.getEntity(entityId);
+                        if (tracker.hasEntity(entityId)) {
-                        if (type.isPresent()) {
+                            protocol.get(MetadataRewriter1_9To1_8.class).handleMetadata(entityId, metadataList, wrapper.user());
-                            protocol.get(MetadataRewriter1_9To1_8.class).handleMetadata(entityId, type.get(), metadataList, wrapper.user());
                         } else {
                             // Buffer
                             tracker.addMetadataToBuffer(entityId, metadataList);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/SpawnPackets.java

@@ -22,7 +22,6 @@ import us.myles.ViaVersion.protocols.protocol1_9to1_8.storage.EntityTracker1_9;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Optional;
 
 public class SpawnPackets {
     public static final ValueTransformer<Integer, Double> toNewDouble = new ValueTransformer<Integer, Double>(Type.DOUBLE) {
@@ -215,9 +214,8 @@ public class SpawnPackets {
                         List<Metadata> metadataList = wrapper.get(Types1_9.METADATA_LIST, 0);
                         int entityId = wrapper.get(Type.VAR_INT, 0);
                         EntityTracker1_9 tracker = wrapper.user().get(EntityTracker1_9.class);
-                        Optional<Entity1_10Types.EntityType> type = tracker.getEntity(entityId);
+                        if (tracker.hasEntity(entityId)) {
-                        if (type.isPresent()) {
+                            protocol.get(MetadataRewriter1_9To1_8.class).handleMetadata(entityId, metadataList, wrapper.user());
-                            protocol.get(MetadataRewriter1_9To1_8.class).handleMetadata(entityId, type.get(), metadataList, wrapper.user());
                         } else {
                             Via.getPlatform().getLogger().warning("Unable to find entity for metadata, entity ID: " + entityId);
                             metadataList.clear();
@@ -321,9 +319,8 @@ public class SpawnPackets {
                         List<Metadata> metadataList = wrapper.get(Types1_9.METADATA_LIST, 0);
                         int entityId = wrapper.get(Type.VAR_INT, 0);
                         EntityTracker1_9 tracker = wrapper.user().get(EntityTracker1_9.class);
-                        Optional<Entity1_10Types.EntityType> type = tracker.getEntity(entityId);
+                        if (tracker.hasEntity(entityId)) {
-                        if (type.isPresent()) {
+                            protocol.get(MetadataRewriter1_9To1_8.class).handleMetadata(entityId, metadataList, wrapper.user());
-                            protocol.get(MetadataRewriter1_9To1_8.class).handleMetadata(entityId, type.get(), metadataList, wrapper.user());
                         } else {
                             Via.getPlatform().getLogger().warning("Unable to find entity for metadata, entity ID: " + entityId);
                             metadataList.clear();

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/storage/EntityTracker1_9.java

@@ -31,7 +31,7 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 
 @Getter
-public class EntityTracker1_9 extends EntityTracker<EntityType> {
+public class EntityTracker1_9 extends EntityTracker {
     private final Map<Integer, UUID> uuidMap = new ConcurrentHashMap<>();
     private final Map<Integer, List<Metadata>> metadataBuffer = new ConcurrentHashMap<>();
     private final Map<Integer, Integer> vehicleMap = new ConcurrentHashMap<>();
@@ -116,7 +116,7 @@ public class EntityTracker1_9 extends EntityTracker<EntityType> {
     }
 
     public void handleMetadata(int entityId, List<Metadata> metadataList) {
-        EntityType type = getEntity(entityId).orElse(null);
+        us.myles.ViaVersion.api.entities.EntityType type = getEntity(entityId);
         if (type == null) {
             return;
         }
@@ -292,7 +292,7 @@ public class EntityTracker1_9 extends EntityTracker<EntityType> {
             wrapper.write(Type.VAR_INT, entityId);
             wrapper.write(Types1_9.METADATA_LIST, metadataList);
             getUser().get(ProtocolInfo.class).getPipeline().getProtocol(Protocol1_9To1_8.class).get(MetadataRewriter1_9To1_8.class)
-                    .handleMetadata(entityId, getEntity(entityId).orElse(null), metadataList, getUser());
+                    .handleMetadata(entityId, metadataList, getUser());
             handleMetadata(entityId, metadataList);
             if (!metadataList.isEmpty()) {
                 try {