Merge pull request #1048 from Gerrygames/1.13.2

1.13.2

README.md

@@ -1,4 +1,4 @@
-# ViaVersion 1.5.0 - Spigot, Sponge, BungeeCord
+# ViaVersion 1.5.2 - Spigot, Sponge, BungeeCord
 [![Build Status](https://travis-ci.org/MylesIsCool/ViaVersion.svg?branch=master)](https://travis-ci.org/MylesIsCool/ViaVersion)
 [![Discord](https://img.shields.io/badge/chat-on%20discord-blue.svg)](https://viaversion.com/discord)
 

bukkit/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>viaversion-parent</artifactId>
         <groupId>us.myles</groupId>
-        <version>1.5.1-SNAPSHOT</version>
+        <version>1.5.3-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

bukkit/src/main/java/us/myles/ViaVersion/bukkit/listeners/protocol1_9to1_8/HandItemCache.java

@@ -14,8 +14,6 @@ public class HandItemCache extends BukkitRunnable {
     private static Map<UUID, Item> handCache = new ConcurrentHashMap<>();
 
     public static Item getHandItem(UUID player) {
-        if (!handCache.containsKey(player))
-            return null;
         return handCache.get(player);
     }
 

bungee/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>viaversion-parent</artifactId>
         <groupId>us.myles</groupId>
-        <version>1.5.1-SNAPSHOT</version>
+        <version>1.5.3-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

bungee/src/main/java/us/myles/ViaVersion/bungee/service/ProtocolDetectorService.java

@@ -27,16 +27,19 @@ public class ProtocolDetectorService implements Runnable {
     public static Integer getProtocolId(String serverName) {
         // Step 1. Check Config
         Map<String, Integer> servers = ((BungeeConfigAPI) Via.getConfig()).getBungeeServerProtocols();
-        if (servers.containsKey(serverName)) {
+        Integer protocol = servers.get(serverName);
-            return servers.get(serverName);
+        if (protocol != null) {
+            return protocol;
         }
         // Step 2. Check Detected
-        if (detectedProtocolIds.containsKey(serverName)) {
+        Integer detectedProtocol = detectedProtocolIds.get(serverName);
-            return detectedProtocolIds.get(serverName);
+        if (detectedProtocol != null) {
+            return detectedProtocol;
         }
         // Step 3. Use Default
-        if (servers.containsKey("default")) {
+        Integer defaultProtocol = servers.get("default");
-            return servers.get("default");
+        if (defaultProtocol != null) {
+            return defaultProtocol;
         }
         // Step 4: Use bungee lowest supported... *cries*
         return BungeeVersionProvider.getLowestSupportedVersion();
@@ -58,11 +61,10 @@ public class ProtocolDetectorService implements Runnable {
                     detectedProtocolIds.put(key, serverPing.getVersion().getProtocol());
                     if (((BungeeConfigAPI) Via.getConfig()).isBungeePingSave()) {
                         Map<String, Integer> servers = ((BungeeConfigAPI) Via.getConfig()).getBungeeServerProtocols();
-                        if (servers.containsKey(key)) {
+                        Integer protocol = servers.get(key);
-                            if (servers.get(key) == serverPing.getVersion().getProtocol()) {
+                        if (protocol != null && protocol == serverPing.getVersion().getProtocol()) {
                             return;
                         }
-                        }
                         // Ensure we're the only ones writing to the config
                         synchronized (Via.getPlatform().getConfigurationProvider()) {
                             servers.put(key, serverPing.getVersion().getProtocol());

common/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>viaversion-parent</artifactId>
         <groupId>us.myles</groupId>
-        <version>1.5.1-SNAPSHOT</version>
+        <version>1.5.3-SNAPSHOT</version>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>

common/src/main/java/us/myles/ViaVersion/api/PacketWrapper.java

@@ -330,7 +330,7 @@ public class PacketWrapper {
         resetReader();
 
         // Apply other protocols
-        apply(Direction.OUTGOING, user().get(ProtocolInfo.class).getState(), index, protocols);
+        apply(direction, user().get(ProtocolInfo.class).getState(), index, protocols);
         // Send
         ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
         writeToBuffer(output);

common/src/main/java/us/myles/ViaVersion/api/minecraft/metadata/types/MetaType1_13_2.java

@@ -0,0 +1,37 @@
+package us.myles.ViaVersion.api.minecraft.metadata.types;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import us.myles.ViaVersion.api.minecraft.metadata.MetaType;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.Protocol1_13_2To1_13_1;
+
+@RequiredArgsConstructor
+@Getter
+public enum MetaType1_13_2 implements MetaType {
+    Byte(0, Type.BYTE),
+    VarInt(1, Type.VAR_INT),
+    Float(2, Type.FLOAT),
+    String(3, Type.STRING),
+    Chat(4, Type.STRING),
+    OptChat(5, Type.OPTIONAL_CHAT),
+    Slot(6, Type.FLAT_VAR_INT_ITEM),
+    Boolean(7, Type.BOOLEAN),
+    Vector3F(8, Type.ROTATION),
+    Position(9, Type.POSITION),
+    OptPosition(10, Type.OPTIONAL_POSITION),
+    Direction(11, Type.VAR_INT),
+    OptUUID(12, Type.OPTIONAL_UUID),
+    BlockID(13, Type.VAR_INT),
+    NBTTag(14, Type.NBT),
+    PARTICLE(15, Protocol1_13_2To1_13_1.PARTICLE_TYPE),
+    Discontinued(99, null);
+
+    private final int typeID;
+    private final Type type;
+
+    public static MetaType1_13_2 byId(int id) {
+        return values()[id];
+    }
+
+}

common/src/main/java/us/myles/ViaVersion/api/platform/providers/ViaProviders.java

@@ -18,15 +18,14 @@ public class ViaProviders {
     }
 
     public <T extends Provider> void use(Class<T> provider, T value) {
-        if (lonelyProviders.contains(provider)) {
         lonelyProviders.remove(provider);
-        }
         providers.put(provider, value);
     }
 
     public <T extends Provider> T get(Class<T> provider) {
-        if (providers.containsKey(provider)) {
+        Provider rawProvider = providers.get(provider);
-            return (T) providers.get(provider);
+        if (rawProvider != null) {
+            return (T) rawProvider;
         } else {
             if (lonelyProviders.contains(provider)) {
                 throw new IllegalStateException("There was no provider for " + provider + ", one is required!");

common/src/main/java/us/myles/ViaVersion/api/protocol/Protocol.java

@@ -137,10 +137,8 @@ public abstract class Protocol {
     public void transform(Direction direction, State state, PacketWrapper packetWrapper) throws Exception {
         Pair<State, Integer> statePacket = new Pair<>(state, packetWrapper.getId());
         Map<Pair<State, Integer>, ProtocolPacket> packetMap = (direction == Direction.OUTGOING ? outgoing : incoming);
-        ProtocolPacket protocolPacket;
+        ProtocolPacket protocolPacket = packetMap.get(statePacket);
-        if (packetMap.containsKey(statePacket)) {
+        if (protocolPacket == null) {
-            protocolPacket = packetMap.get(statePacket);
-        } else {
             return;
         }
         // write packet id

common/src/main/java/us/myles/ViaVersion/api/protocol/ProtocolRegistry.java

@@ -13,6 +13,7 @@ import us.myles.ViaVersion.protocols.protocol1_11to1_10.Protocol1_11To1_10;
 import us.myles.ViaVersion.protocols.protocol1_12_1to1_12.Protocol1_12_1TO1_12;
 import us.myles.ViaVersion.protocols.protocol1_12_2to1_12_1.Protocol1_12_2TO1_12_1;
 import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.Protocol1_12To1_11_1;
+import us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.Protocol1_13_2To1_13_1;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
 import us.myles.ViaVersion.protocols.protocol1_9_1_2to1_9_3_4.Protocol1_9_1_2TO1_9_3_4;
 import us.myles.ViaVersion.protocols.protocol1_9_1to1_9.Protocol1_9_1TO1_9;
@@ -57,6 +58,7 @@ public class ProtocolRegistry {
 
         registerProtocol(new Protocol1_13To1_12_2(), Collections.singletonList(ProtocolVersion.v1_13.getId()), ProtocolVersion.v1_12_2.getId());
         registerProtocol(new Protocol1_13_1To1_13(),  Arrays.asList(ProtocolVersion.v1_13_1.getId()), ProtocolVersion.v1_13.getId());
+        registerProtocol(new Protocol1_13_2To1_13_1(),  Arrays.asList(ProtocolVersion.v1_13_2.getId()), ProtocolVersion.v1_13_1.getId());
     }
 
     /**
@@ -165,13 +167,14 @@ public class ProtocolRegistry {
         if (current.size() > 50) return null; // Fail safe, protocol too complicated.
 
         // First check if there is any protocols for this
-        if (!registryMap.containsKey(clientVersion)) {
+        Map<Integer, Protocol> inputMap = registryMap.get(clientVersion);
+        if (inputMap == null) {
             return null; // Not supported
         }
         // Next check there isn't an obvious path
-        Map<Integer, Protocol> inputMap = registryMap.get(clientVersion);
+        Protocol protocol = inputMap.get(serverVersion);
-        if (inputMap.containsKey(serverVersion)) {
+        if (protocol != null) {
-            current.add(new Pair<>(serverVersion, inputMap.get(serverVersion)));
+            current.add(new Pair<>(serverVersion, protocol));
             return current; // Easy solution
         }
         // There might be a more advanced solution... So we'll see if any of the others can get us there
@@ -211,8 +214,9 @@ public class ProtocolRegistry {
     public static List<Pair<Integer, Protocol>> getProtocolPath(int clientVersion, int serverVersion) {
         Pair<Integer, Integer> protocolKey = new Pair<>(clientVersion, serverVersion);
         // Check cache
-        if (pathCache.containsKey(protocolKey)) {
+        List<Pair<Integer, Protocol>> protocolList = pathCache.get(protocolKey);
-            return pathCache.get(protocolKey);
+        if (protocolList != null) {
+            return protocolList;
         }
         // Generate path
         List<Pair<Integer, Protocol>> outputPath = getProtocolPath(new ArrayList<Pair<Integer, Protocol>>(), clientVersion, serverVersion);

common/src/main/java/us/myles/ViaVersion/api/protocol/ProtocolVersion.java

@@ -34,6 +34,7 @@ public class ProtocolVersion {
     public static final ProtocolVersion v1_12_2;
     public static final ProtocolVersion v1_13;
     public static final ProtocolVersion v1_13_1;
+    public static final ProtocolVersion v1_13_2;
     public static final ProtocolVersion unknown;
 
     private final int id;
@@ -64,6 +65,7 @@ public class ProtocolVersion {
         register(v1_12_2 = new ProtocolVersion(340, "1.12.2"));
         register(v1_13 = new ProtocolVersion(393, "1.13"));
         register(v1_13_1 = new ProtocolVersion(401, "1.13.1"));
+        register(v1_13_2 = new ProtocolVersion(402, "1.13.2"));
         register(unknown = new ProtocolVersion(-1, "UNKNOWN"));
     }
 
@@ -77,8 +79,9 @@ public class ProtocolVersion {
     }
 
     public static ProtocolVersion getProtocol(int id) {
-        if (versions.containsKey(id)) {
+        ProtocolVersion protocolVersion = versions.get(id);
-            return versions.get(id);
+        if (protocolVersion != null) {
+            return protocolVersion;
         } else {
             return new ProtocolVersion(id, "Unknown (" + id + ")");
         }

common/src/main/java/us/myles/ViaVersion/api/type/Type.java

@@ -76,8 +76,11 @@ public abstract class Type<T> implements ByteBufReader<T>, ByteBufWriter<T> {
 
     /* 1.13 Flat Item (no data) */
     public static final Type<Item> FLAT_ITEM = new FlatItemType();
+    public static final Type<Item> FLAT_VAR_INT_ITEM = new FlatVarIntItemType();
     public static final Type<Item[]> FLAT_ITEM_ARRAY = new FlatItemArrayType();
+    public static final Type<Item[]> FLAT_VAR_INT_ITEM_ARRAY = new FlatVarIntItemArrayType();
     public static final Type<Item[]> FLAT_ITEM_ARRAY_VAR_INT = new ArrayType<>(FLAT_ITEM);
+    public static final Type<Item[]> FLAT_VAR_INT_ITEM_ARRAY_VAR_INT = new ArrayType<>(FLAT_VAR_INT_ITEM);
 
     /* Actual Class */
 

common/src/main/java/us/myles/ViaVersion/api/type/types/minecraft/FlatVarIntItemArrayType.java

@@ -0,0 +1,30 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+import us.myles.ViaVersion.api.type.Type;
+
+public class FlatVarIntItemArrayType extends BaseItemArrayType {
+
+    public FlatVarIntItemArrayType() {
+        super("Flat Item Array");
+    }
+
+    @Override
+    public Item[] read(ByteBuf buffer) throws Exception {
+        int amount = Type.SHORT.read(buffer);
+        Item[] array = new Item[amount];
+        for (int i = 0; i < amount; i++) {
+            array[i] = Type.FLAT_VAR_INT_ITEM.read(buffer);
+        }
+        return array;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Item[] object) throws Exception {
+        Type.SHORT.write(buffer, (short) object.length);
+        for (Item o : object) {
+            Type.FLAT_VAR_INT_ITEM.write(buffer, o);
+        }
+    }
+}

common/src/main/java/us/myles/ViaVersion/api/type/types/minecraft/FlatVarIntItemType.java

@@ -0,0 +1,37 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+import us.myles.ViaVersion.api.type.Type;
+
+public class FlatVarIntItemType extends BaseItemType {
+    public FlatVarIntItemType() {
+        super("FlatVarIntItem");
+    }
+
+    @Override
+    public Item read(ByteBuf buffer) throws Exception {
+        boolean present = buffer.readBoolean();
+        if (!present) {
+            return null;
+        } else {
+            Item item = new Item();
+            item.setId(Type.VAR_INT.read(buffer).shortValue());  //TODO Maybe we should consider changing id field type to int
+            item.setAmount(buffer.readByte());
+            item.setTag(Type.NBT.read(buffer));
+            return item;
+        }
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Item object) throws Exception {
+        if (object == null) {
+            buffer.writeBoolean(false);
+        } else {
+            buffer.writeBoolean(true);
+            Type.VAR_INT.write(buffer, (int) object.getId());
+            buffer.writeByte(object.getAmount());
+            Type.NBT.write(buffer, object.getTag());
+        }
+    }
+}

common/src/main/java/us/myles/ViaVersion/api/type/types/version/Metadata1_13_2Type.java

@@ -0,0 +1,29 @@
+package us.myles.ViaVersion.api.type.types.version;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13_2;
+import us.myles.ViaVersion.api.type.types.minecraft.MetaTypeTemplate;
+
+public class Metadata1_13_2Type extends MetaTypeTemplate {
+	@Override
+	public Metadata read(ByteBuf buffer) throws Exception {
+		short index = buffer.readUnsignedByte();
+
+		if (index == 0xff) return null; //End of metadata
+		MetaType1_13_2 type = MetaType1_13_2.byId(buffer.readByte());
+
+		return new Metadata(index, type, type.getType().read(buffer));
+	}
+
+	@Override
+	public void write(ByteBuf buffer, Metadata object) throws Exception {
+		if (object == null) {
+			buffer.writeByte(255);
+		} else {
+			buffer.writeByte(object.getId());
+			buffer.writeByte(object.getMetaType().getTypeID());
+			object.getMetaType().getType().write(buffer, object.getValue());
+		}
+	}
+}

common/src/main/java/us/myles/ViaVersion/api/type/types/version/MetadataList1_13_2Type.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types.version;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.type.types.minecraft.MetaListTypeTemplate;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MetadataList1_13_2Type extends MetaListTypeTemplate {
+    @Override
+    public List<Metadata> read(ByteBuf buffer) throws Exception {
+        List<Metadata> list = new ArrayList<>();
+        Metadata meta;
+        do {
+            meta = Types1_13_2.METADATA.read(buffer);
+            if (meta != null)
+                list.add(meta);
+        } while (meta != null);
+
+        return list;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, List<Metadata> object) throws Exception {
+        for (Metadata m : object)
+            Types1_13_2.METADATA.write(buffer, m);
+
+        // Write end of list
+        Types1_13_2.METADATA.write(buffer, null);
+    }
+}

common/src/main/java/us/myles/ViaVersion/api/type/types/version/Types1_13_2.java

@@ -0,0 +1,18 @@
+package us.myles.ViaVersion.api.type.types.version;
+
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.util.List;
+
+public class Types1_13_2 {
+	/**
+	 * Metadata list type for 1.13
+	 */
+	public static final Type<List<Metadata>> METADATA_LIST = new MetadataList1_13_2Type();
+
+	/**
+	 * Metadata type for 1.13
+	 */
+	public static final Type<Metadata> METADATA = new Metadata1_13_2Type();
+}

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

@@ -42,8 +42,10 @@ public class BlockEntityRewriter {
     }
 
     public static String toNewIdentifier(String oldId) {
-        if (oldToNewNames.containsKey(oldId))
+        String newName = oldToNewNames.get(oldId);
-            return oldToNewNames.get(oldId);
+        if (newName != null) {
+            return newName;
+        }
         return oldId;
     }
 }

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

@@ -90,8 +90,9 @@ public class EntityIdRewriter {
     public static void toClient(CompoundTag tag) {
         if (tag.get("id") instanceof StringTag) {
             StringTag id = tag.get("id");
-            if (oldToNewNames.containsKey(id.getValue())) {
+            String newName = oldToNewNames.get(id.getValue());
-                id.setValue(oldToNewNames.get(id.getValue()));
+            if (newName != null) {
+                id.setValue(newName);
             }
         }
     }
@@ -117,8 +118,9 @@ public class EntityIdRewriter {
             CompoundTag entityTag = item.getTag().get("EntityTag");
             if (entityTag.get("id") instanceof StringTag) {
                 StringTag id = entityTag.get("id");
-                if (oldToNewNames.inverse().containsKey(id.getValue())) {
+                String newName = oldToNewNames.inverse().get(id.getValue());
-                    id.setValue(oldToNewNames.inverse().get(id.getValue()));
+                if (newName != null) {
+                    id.setValue(newName);
                 }
             }
         }

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

@@ -33,9 +33,7 @@ public class EntityTracker extends StoredObject {
     }
 
     public Optional<Entity1_11Types.EntityType> get(int id) {
-        if (!has(id))
+        return Optional.fromNullable(clientEntityTypes.get(id));
-            return Optional.absent();
-        return Optional.of(clientEntityTypes.get(id));
     }
 
     public void addHologram(int entId) {

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

@@ -28,9 +28,7 @@ public class EntityTracker extends StoredObject {
     }
 
     public Optional<Entity1_12Types.EntityType> get(int id) {
-        if (!has(id))
+        return Optional.fromNullable(clientEntityTypes.get(id));
-            return Optional.absent();
-        return Optional.of(clientEntityTypes.get(id));
     }
 
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_2to1_13_1/Protocol1_13_2To1_13_1.java

@@ -0,0 +1,82 @@
+package us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+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.type.Type;
+import us.myles.ViaVersion.packets.State;
+import us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets.EntityPackets;
+import us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets.InventoryPackets;
+import us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets.WorldPackets;
+import us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.types.Particle1_13_2Type;
+
+public class Protocol1_13_2To1_13_1 extends Protocol {
+	public static final Particle1_13_2Type PARTICLE_TYPE = new Particle1_13_2Type();
+
+	@Override
+	protected void registerPackets() {
+		InventoryPackets.register(this);
+		WorldPackets.register(this);
+		EntityPackets.register(this);
+
+		//Edit Book
+		registerIncoming(State.PLAY, 0x0B, 0x0B, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.FLAT_ITEM, Type.FLAT_VAR_INT_ITEM);
+				map(Type.BOOLEAN);
+			}
+		});
+
+		// Advancements
+		registerOutgoing(State.PLAY, 0x51, 0x51, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						wrapper.passthrough(Type.BOOLEAN); // Reset/clear
+						int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
+
+						for (int i = 0; i < size; i++) {
+							wrapper.passthrough(Type.STRING); // Identifier
+
+							// Parent
+							if (wrapper.passthrough(Type.BOOLEAN))
+								wrapper.passthrough(Type.STRING);
+
+							// Display data
+							if (wrapper.passthrough(Type.BOOLEAN)) {
+								wrapper.passthrough(Type.STRING); // Title
+								wrapper.passthrough(Type.STRING); // Description
+								Item icon = wrapper.read(Type.FLAT_ITEM);
+								wrapper.write(Type.FLAT_VAR_INT_ITEM, icon);
+								wrapper.passthrough(Type.VAR_INT); // Frame type
+								int flags = wrapper.passthrough(Type.INT); // Flags
+								if ((flags & 1) != 0)
+									wrapper.passthrough(Type.STRING); // Background texture
+								wrapper.passthrough(Type.FLOAT); // X
+								wrapper.passthrough(Type.FLOAT); // Y
+							}
+
+							wrapper.passthrough(Type.STRING_ARRAY); // Criteria
+
+							int arrayLength = wrapper.passthrough(Type.VAR_INT);
+							for (int array = 0; array < arrayLength; array++) {
+								wrapper.passthrough(Type.STRING_ARRAY); // String array
+							}
+						}
+					}
+				});
+			}
+		});
+	}
+
+	@Override
+	public void init(UserConnection userConnection) {
+
+	}
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_2to1_13_1/packets/EntityPackets.java

@@ -0,0 +1,97 @@
+package us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13;
+import us.myles.ViaVersion.api.minecraft.metadata.types.MetaType1_13_2;
+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.type.Type;
+import us.myles.ViaVersion.api.type.types.version.Types1_13;
+import us.myles.ViaVersion.api.type.types.version.Types1_13_2;
+import us.myles.ViaVersion.packets.State;
+
+public class EntityPackets {
+
+	public static void register(Protocol protocol) {
+		// Spawn mob packet
+		protocol.registerOutgoing(State.PLAY, 0x3, 0x3, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.VAR_INT); // 0 - Entity ID
+				map(Type.UUID); // 1 - Entity UUID
+				map(Type.VAR_INT); // 2 - Entity Type
+				map(Type.DOUBLE); // 3 - X
+				map(Type.DOUBLE); // 4 - Y
+				map(Type.DOUBLE); // 5 - Z
+				map(Type.BYTE); // 6 - Yaw
+				map(Type.BYTE); // 7 - Pitch
+				map(Type.BYTE); // 8 - Head Pitch
+				map(Type.SHORT); // 9 - Velocity X
+				map(Type.SHORT); // 10 - Velocity Y
+				map(Type.SHORT); // 11 - Velocity Z
+				map(Types1_13.METADATA_LIST, Types1_13_2.METADATA_LIST); // 12 - Metadata
+
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
+							if (metadata.getMetaType() == MetaType1_13.Slot) {
+								metadata.setMetaType(MetaType1_13_2.Slot);
+							}
+						}
+					}
+				});
+			}
+		});
+
+		// Spawn player packet
+		protocol.registerOutgoing(State.PLAY, 0x05, 0x05, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.VAR_INT); // 0 - Entity ID
+				map(Type.UUID); // 1 - Player UUID
+				map(Type.DOUBLE); // 2 - X
+				map(Type.DOUBLE); // 3 - Y
+				map(Type.DOUBLE); // 4 - Z
+				map(Type.BYTE); // 5 - Yaw
+				map(Type.BYTE); // 6 - Pitch
+				map(Types1_13.METADATA_LIST, Types1_13_2.METADATA_LIST); // 7 - Metadata
+
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
+							if (metadata.getMetaType() == MetaType1_13.Slot) {
+								metadata.setMetaType(MetaType1_13_2.Slot);
+							}
+						}
+					}
+				});
+			}
+		});
+
+
+		// Metadata packet
+		protocol.registerOutgoing(State.PLAY, 0x3F, 0x3F, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.VAR_INT); // 0 - Entity ID
+				map(Types1_13.METADATA_LIST, Types1_13_2.METADATA_LIST); // 1 - Metadata list
+
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						for (Metadata metadata : wrapper.get(Types1_13_2.METADATA_LIST, 0)) {
+							if (metadata.getMetaType() == MetaType1_13.Slot) {
+								metadata.setMetaType(MetaType1_13_2.Slot);
+							}
+						}
+					}
+				});
+			}
+		});
+	}
+
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_2to1_13_1/packets/InventoryPackets.java

@@ -0,0 +1,151 @@
+package us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+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.type.Type;
+import us.myles.ViaVersion.packets.State;
+
+public class InventoryPackets {
+
+	public static void register(Protocol protocol) {
+
+		/*
+            Outgoing packets
+        */
+
+		// Set slot packet
+		protocol.registerOutgoing(State.PLAY, 0x17, 0x17, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.BYTE); // 0 - Window ID
+				map(Type.SHORT); // 1 - Slot ID
+				map(Type.FLAT_ITEM, Type.FLAT_VAR_INT_ITEM); // 2 - Slot Value
+			}
+		});
+
+		// Window items packet
+		protocol.registerOutgoing(State.PLAY, 0x15, 0x15, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.UNSIGNED_BYTE); // 0 - Window ID
+				map(Type.FLAT_ITEM_ARRAY, Type.FLAT_VAR_INT_ITEM_ARRAY); // 1 - Window Values
+			}
+		});
+
+		// Plugin message
+		protocol.registerOutgoing(State.PLAY, 0x19, 0x19, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.STRING); // Channel
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						String channel = wrapper.get(Type.STRING, 0);
+						if (channel.equals("minecraft:trader_list") || channel.equals("trader_list")) {
+							wrapper.passthrough(Type.INT); // Passthrough Window ID
+
+							int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
+							for (int i = 0; i < size; i++) {
+								// Input Item
+								wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+								// Output Item
+								wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+
+								boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+								if (secondItem) {
+									wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+								}
+
+								wrapper.passthrough(Type.BOOLEAN); // Trade disabled
+								wrapper.passthrough(Type.INT); // Number of tools uses
+								wrapper.passthrough(Type.INT); // Maximum number of trade uses
+							}
+						}
+					}
+				});
+			}
+		});
+
+		// Entity Equipment Packet
+		protocol.registerOutgoing(State.PLAY, 0x42, 0x42, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.VAR_INT); // 0 - Entity ID
+				map(Type.VAR_INT); // 1 - Slot ID
+				map(Type.FLAT_ITEM, Type.FLAT_VAR_INT_ITEM); // 2 - Item
+			}
+		});
+
+		// Declare Recipes
+		protocol.registerOutgoing(State.PLAY, 0x54, 0x54, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						int recipesNo = wrapper.passthrough(Type.VAR_INT);
+						for (int i = 0; i < recipesNo; i++) {
+							wrapper.passthrough(Type.STRING); // Id
+							String type = wrapper.passthrough(Type.STRING);
+							if (type.equals("crafting_shapeless")) {
+								wrapper.passthrough(Type.STRING); // Group
+								int ingredientsNo = wrapper.passthrough(Type.VAR_INT);
+								for (int i1 = 0; i1 < ingredientsNo; i1++) {
+									wrapper.write(Type.FLAT_VAR_INT_ITEM_ARRAY_VAR_INT, wrapper.read(Type.FLAT_ITEM_ARRAY_VAR_INT));
+								}
+								wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+							} else if (type.equals("crafting_shaped")) {
+								int ingredientsNo = wrapper.passthrough(Type.VAR_INT) * wrapper.passthrough(Type.VAR_INT);
+								wrapper.passthrough(Type.STRING); // Group
+								for (int i1 = 0; i1 < ingredientsNo; i1++) {
+									wrapper.write(Type.FLAT_VAR_INT_ITEM_ARRAY_VAR_INT, wrapper.read(Type.FLAT_ITEM_ARRAY_VAR_INT));
+								}
+								wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+							} else if (type.equals("smelting")) {
+								wrapper.passthrough(Type.STRING); // Group
+								// Ingredient start
+								wrapper.write(Type.FLAT_VAR_INT_ITEM_ARRAY_VAR_INT, wrapper.read(Type.FLAT_ITEM_ARRAY_VAR_INT));
+								// Ingredient end
+								wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+								wrapper.passthrough(Type.FLOAT); // EXP
+								wrapper.passthrough(Type.VAR_INT); // Cooking time
+							}
+						}
+					}
+				});
+			}
+		});
+
+
+        /*
+            Incoming packets
+         */
+
+		// Click window packet
+		protocol.registerIncoming(State.PLAY, 0x08, 0x08, new PacketRemapper() {
+					@Override
+					public void registerMap() {
+						map(Type.UNSIGNED_BYTE); // 0 - Window ID
+						map(Type.SHORT); // 1 - Slot
+						map(Type.BYTE); // 2 - Button
+						map(Type.SHORT); // 3 - Action number
+						map(Type.VAR_INT); // 4 - Mode
+						map(Type.FLAT_VAR_INT_ITEM, Type.FLAT_ITEM); // 5 - Clicked Item
+					}
+				}
+		);
+
+		// Creative Inventory Action
+		protocol.registerIncoming(State.PLAY, 0x24, 0x24, new PacketRemapper() {
+					@Override
+					public void registerMap() {
+						map(Type.SHORT); // 0 - Slot
+						map(Type.FLAT_VAR_INT_ITEM, Type.FLAT_ITEM); // 1 - Clicked Item
+					}
+				}
+		);
+	}
+
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_2to1_13_1/packets/WorldPackets.java

@@ -0,0 +1,40 @@
+package us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.packets;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+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.type.Type;
+import us.myles.ViaVersion.packets.State;
+
+public class WorldPackets {
+
+	public static void register(Protocol protocol) {
+		//spawn particle
+		protocol.registerOutgoing(State.PLAY, 0x24, 0x24, new PacketRemapper() {
+			@Override
+			public void registerMap() {
+				map(Type.INT); // 0 - Particle ID
+				map(Type.BOOLEAN); // 1 - Long Distance
+				map(Type.FLOAT); // 2 - X
+				map(Type.FLOAT); // 3 - Y
+				map(Type.FLOAT); // 4 - Z
+				map(Type.FLOAT); // 5 - Offset X
+				map(Type.FLOAT); // 6 - Offset Y
+				map(Type.FLOAT); // 7 - Offset Z
+				map(Type.FLOAT); // 8 - Particle Data
+				map(Type.INT); // 9 - Particle Count
+				handler(new PacketHandler() {
+					@Override
+					public void handle(PacketWrapper wrapper) throws Exception {
+						int id = wrapper.get(Type.INT, 0);
+						if (id == 27) {
+							wrapper.write(Type.FLAT_VAR_INT_ITEM, wrapper.read(Type.FLAT_ITEM));
+						}
+					}
+				});
+			}
+		});
+	}
+
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13_2to1_13_1/types/Particle1_13_2Type.java

@@ -0,0 +1,44 @@
+package us.myles.ViaVersion.protocols.protocol1_13_2to1_13_1.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.data.Particle;
+
+public class Particle1_13_2Type extends Type<Particle> {
+    public Particle1_13_2Type() {
+        super("Particle", Particle.class);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Particle object) throws Exception {
+        Type.VAR_INT.write(buffer, object.getId());
+        for (Particle.ParticleData data : object.getArguments())
+            data.getType().write(buffer, data.getValue());
+    }
+
+    @Override
+    public Particle read(ByteBuf buffer) throws Exception {
+        int type = Type.VAR_INT.read(buffer);
+        Particle particle = new Particle(type);
+
+        switch (type) {
+            // Block / Falling Dust /
+            case 3:
+            case 20:
+                particle.getArguments().add(new Particle.ParticleData(Type.VAR_INT, Type.VAR_INT.read(buffer))); // Flat Block
+                break;
+            // Dust
+            case 11:
+                particle.getArguments().add(new Particle.ParticleData(Type.FLOAT, Type.FLOAT.read(buffer))); // Red 0 - 1
+                particle.getArguments().add(new Particle.ParticleData(Type.FLOAT, Type.FLOAT.read(buffer))); // Green 0 - 1
+                particle.getArguments().add(new Particle.ParticleData(Type.FLOAT, Type.FLOAT.read(buffer))); // Blue 0 - 1
+                particle.getArguments().add(new Particle.ParticleData(Type.FLOAT, Type.FLOAT.read(buffer)));// Scale 0.01 - 4
+                break;
+            // Item
+            case 27:
+                particle.getArguments().add(new Particle.ParticleData(Type.FLAT_VAR_INT_ITEM, Type.FLAT_VAR_INT_ITEM.read(buffer))); // Flat item
+                break;
+        }
+        return particle;
+    }
+}

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/data/EntityNameRewriter.java

@@ -46,11 +46,14 @@ public class EntityNameRewriter {
     }
 
     public static String rewrite(String entName) {
-        if (entityNames.containsKey(entName))
+        String entityName = entityNames.get(entName);
-            return entityNames.get(entName);
+        if (entityName != null) {
-        if (entityNames.containsKey("minecraft:" + entName))
+            return entityName;
-            return entityNames.get("minecraft:" + entName);
+        }
-        else
+        entityName = entityNames.get("minecraft:" + entName);
+        if (entityName != null) {
+            return entityName;
+        } else
             return entName;
     }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/providers/BlockEntityProvider.java

@@ -39,15 +39,15 @@ public class BlockEntityProvider implements Provider {
             return -1;
 
         String id = (String) tag.get("id").getValue();
-
+        BlockEntityHandler handler = handlers.get(id);
-        if (!handlers.containsKey(id)) {
+        if (handler == null) {
             if (Via.getManager().isDebug()) {
                 Via.getPlatform().getLogger().warning("Unhandled BlockEntity " + id + " full tag: " + tag);
             }
             return -1;
         }
 
-        int newBlock = handlers.get(id).transform(user, tag);
+        int newBlock = handler.transform(user, tag);
 
         if (sendUpdate && newBlock != -1)
             sendBlockChange(user, position, newBlock);

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/providers/PaintingProvider.java

@@ -46,10 +46,6 @@ public class PaintingProvider implements Provider {
         // Handle older versions
         if (!motive.startsWith("minecraft:"))
             motive = "minecraft:" + motive.toLowerCase();
-
+        return Optional.fromNullable(paintings.get(motive));
-        if (paintings.containsKey(motive))
-            return Optional.of(paintings.get(motive));
-
-        return Optional.absent();
     }
 }

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

@@ -28,9 +28,7 @@ public class EntityTracker extends StoredObject {
     }
 
     public Optional<Entity1_13Types.EntityType> get(int id) {
-        if (!has(id))
+        return Optional.fromNullable(clientEntityTypes.get(id));
-            return Optional.absent();
-        return Optional.of(clientEntityTypes.get(id));
     }
 
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9_3to1_9_1_2/chunks/FakeTileEntity.java

@@ -57,8 +57,9 @@ public class FakeTileEntity {
     }
 
     public static CompoundTag getFromBlock(int x, int y, int z, int block) {
-        if (tileEntities.containsKey(block)) {
+        CompoundTag originalTag = tileEntities.get(block);
-            CompoundTag tag = tileEntities.get(block).clone();
+        if (originalTag != null) {
+            CompoundTag tag = originalTag.clone();
             tag.put(new IntTag("x", x));
             tag.put(new IntTag("y", y));
             tag.put(new IntTag("z", z));

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

@@ -230,8 +230,9 @@ public class ItemRewriter {
                     tag = new CompoundTag("tag");
                 }
                 CompoundTag entityTag = new CompoundTag("EntityTag");
-                if (ENTTIY_ID_TO_NAME.containsKey((int) item.getData())) {
+                String entityName = ENTTIY_ID_TO_NAME.get((int) item.getData());
-                    StringTag id = new StringTag("id", ENTTIY_ID_TO_NAME.get((int) item.getData()));
+                if (entityName != null) {
+                    StringTag id = new StringTag("id", entityName);
                     entityTag.put(id);
                     tag.put(entityTag);
                 }
@@ -379,12 +380,14 @@ public class ItemRewriter {
         if (oldID >= 16384) {
             oldID -= 8192;
         }
-        if (POTION_INDEX.containsKey(oldID)) {
+
-            return POTION_INDEX.get(oldID);
+        Integer index = POTION_INDEX.get(oldID);
+        if (index != null) {
+            return index;
         }
 
         oldID = POTION_NAME_TO_ID.get(potionNameFromDamage((short) oldID));
-        return POTION_INDEX.containsKey(oldID) ? POTION_INDEX.get(oldID) : 0;
+        return (index = POTION_INDEX.get(oldID)) != null ? index : 0;
     }
 
     private static void registerEntity(Integer id, String name) {

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

@@ -173,11 +173,7 @@ public enum MetaIndex {
 
     private static Optional<MetaIndex> getIndex(Entity1_10Types.EntityType type, int index) {
         Pair pair = new Pair<>(type, index);
-        if (metadataRewrites.containsKey(pair)) {
+        return Optional.fromNullable(metadataRewrites.get(pair));
-            return Optional.of(metadataRewrites.get(pair));
-        }
-
-        return Optional.absent();
     }
 
     public static MetaIndex searchIndex(Entity1_10Types.EntityType type, int index) {

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

@@ -5,6 +5,7 @@ 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;
@@ -184,8 +185,9 @@ public class EntityPackets {
                         List<Metadata> metadataList = wrapper.get(Types1_9.METADATA_LIST, 0);
                         int entityID = wrapper.get(Type.VAR_INT, 0);
                         EntityTracker tracker = wrapper.user().get(EntityTracker.class);
-                        if (tracker.getClientEntityTypes().containsKey(entityID)) {
+                        Entity1_10Types.EntityType type = tracker.getClientEntityTypes().get(entityID);
-                            MetadataRewriter.transform(tracker.getClientEntityTypes().get(entityID), metadataList);
+                        if (type != null) {
+                            MetadataRewriter.transform(type, metadataList);
                         } else {
                             // Buffer
                             tracker.addMetadataToBuffer(entityID, metadataList);

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

@@ -214,8 +214,9 @@ public class SpawnPackets {
                         List<Metadata> metadataList = wrapper.get(Types1_9.METADATA_LIST, 0);
                         int entityID = wrapper.get(Type.VAR_INT, 0);
                         EntityTracker tracker = wrapper.user().get(EntityTracker.class);
-                        if (tracker.getClientEntityTypes().containsKey(entityID)) {
+                        Entity1_10Types.EntityType type = tracker.getClientEntityTypes().get(entityID);
-                            MetadataRewriter.transform(tracker.getClientEntityTypes().get(entityID), metadataList);
+                        if (type != null) {
+                            MetadataRewriter.transform(type, metadataList);
                         } else {
                             Via.getPlatform().getLogger().warning("Unable to find entity for metadata, entity ID: " + entityID);
                             metadataList.clear();
@@ -319,8 +320,9 @@ public class SpawnPackets {
                         List<Metadata> metadataList = wrapper.get(Types1_9.METADATA_LIST, 0);
                         int entityID = wrapper.get(Type.VAR_INT, 0);
                         EntityTracker tracker = wrapper.user().get(EntityTracker.class);
-                        if (tracker.getClientEntityTypes().containsKey(entityID)) {
+                        Entity1_10Types.EntityType type = tracker.getClientEntityTypes().get(entityID);
-                            MetadataRewriter.transform(tracker.getClientEntityTypes().get(entityID), metadataList);
+                        if (type != null) {
+                            MetadataRewriter.transform(type, metadataList);
                         } 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/sounds/SoundEffect.java

@@ -284,9 +284,7 @@ public enum SoundEffect {
 
     public static SoundEffect getByName(String name) {
         name = name.toLowerCase();
-        if (effects.containsKey(name))
         return effects.get(name);
-        return null;
     }
 
 }

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

@@ -25,7 +25,6 @@ public class CommandBlockStorage extends StoredObject {
 
     public void unloadChunk(int x, int z) {
         Pair<Integer, Integer> chunkPos = new Pair<>(x, z);
-        if (storedCommandBlocks.containsKey(chunkPos))
         storedCommandBlocks.remove(chunkPos);
     }
 
@@ -54,19 +53,18 @@ public class CommandBlockStorage extends StoredObject {
     public Optional<CompoundTag> getCommandBlock(Position position) {
         Pair<Integer, Integer> chunkCoords = getChunkCoords(position);
 
-        if (!storedCommandBlocks.containsKey(chunkCoords))
-            return Optional.absent();
-
         Map<Position, CompoundTag> blocks = storedCommandBlocks.get(chunkCoords);
-
+        if (blocks == null)
-        if (!blocks.containsKey(position))
             return Optional.absent();
 
-        CompoundTag tag = blocks.get(position).clone();
+        CompoundTag tag = blocks.get(position);
+        if (tag == null)
+            return Optional.absent();
+
+        tag = tag.clone();
         tag.put(new ByteTag("powered", (byte) 0));
         tag.put(new ByteTag("auto", (byte) 0));
         tag.put(new ByteTag("conditionMet", (byte) 0));
-
         return Optional.of(tag);
     }
 

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

@@ -59,13 +59,13 @@ public class EntityTracker extends StoredObject {
     }
 
     public UUID getEntityUUID(int id) {
-        if (uuidMap.containsKey(id)) {
+        UUID uuid = uuidMap.get(id);
-            return uuidMap.get(id);
+        if (uuid == null) {
-        } else {
+            uuid = UUID.randomUUID();
-            UUID uuid = UUID.randomUUID();
             uuidMap.put(id, uuid);
-            return uuid;
         }
+
+        return uuid;
     }
 
     public void setSecondHand(Item item) {
@@ -117,11 +117,11 @@ public class EntityTracker extends StoredObject {
     }
 
     public void handleMetadata(int entityID, List<Metadata> metadataList) {
-        if (!clientEntityTypes.containsKey(entityID)) {
+        Entity1_10Types.EntityType type = clientEntityTypes.get(entityID);
+        if (type == null) {
             return;
         }
 
-        Entity1_10Types.EntityType type = clientEntityTypes.get(entityID);
         for (Metadata metadata : new ArrayList<>(metadataList)) {
             // Fix: wither (crash fix)
             if (type == Entity1_10Types.EntityType.WITHER) {
@@ -272,21 +272,23 @@ public class EntityTracker extends StoredObject {
     }
 
     public void addMetadataToBuffer(int entityID, List<Metadata> metadataList) {
-        if (metadataBuffer.containsKey(entityID)) {
+        final List<Metadata> metadata = metadataBuffer.get(entityID);
-            metadataBuffer.get(entityID).addAll(metadataList);
+        if (metadata != null) {
+            metadata.addAll(metadataList);
         } else {
             metadataBuffer.put(entityID, metadataList);
         }
     }
 
     public void sendMetadataBuffer(int entityID) {
-        if (metadataBuffer.containsKey(entityID)) {
+        List<Metadata> metadataList = metadataBuffer.get(entityID);
+        if (metadataList != null) {
             PacketWrapper wrapper = new PacketWrapper(0x39, null, getUser());
             wrapper.write(Type.VAR_INT, entityID);
-            wrapper.write(Types1_9.METADATA_LIST, metadataBuffer.get(entityID));
+            wrapper.write(Types1_9.METADATA_LIST, metadataList);
-            MetadataRewriter.transform(getClientEntityTypes().get(entityID), metadataBuffer.get(entityID));
+            MetadataRewriter.transform(getClientEntityTypes().get(entityID), metadataList);
-            handleMetadata(entityID, metadataBuffer.get(entityID));
+            handleMetadata(entityID, metadataList);
-            if (metadataBuffer.get(entityID).size() > 0) {
+            if (metadataList.size() > 0) {
                 try {
                     wrapper.send(Protocol1_9TO1_8.class);
                 } catch (Exception e) {

common/src/main/java/us/myles/ViaVersion/util/Config.java

@@ -14,7 +14,7 @@ import java.util.Map;
 import java.util.concurrent.ConcurrentSkipListMap;
 
 public abstract class Config implements ConfigurationProvider {
-    private static ThreadLocal<Yaml> yaml = new ThreadLocal<Yaml>() {
+    private static final ThreadLocal<Yaml> YAML = new ThreadLocal<Yaml>() {
         @Override
         protected Yaml initialValue() {
             DumperOptions options = new DumperOptions();
@@ -58,7 +58,7 @@ public abstract class Config implements ConfigurationProvider {
         Map<String, Object> config = null;
         if (location.exists()) {
             try (FileInputStream input = new FileInputStream(location)) {
-                config = (Map<String, Object>) yaml.get().load(input);
+                config = (Map<String, Object>) YAML.get().load(input);
             } catch (FileNotFoundException e) {
                 e.printStackTrace();
             } catch (IOException e) {
@@ -71,7 +71,7 @@ public abstract class Config implements ConfigurationProvider {
 
         Map<String, Object> defaults = config;
         try (InputStream stream = jarConfigFile.openStream()) {
-            defaults = (Map<String, Object>) yaml.get().load(stream);
+            defaults = (Map<String, Object>) YAML.get().load(stream);
             for (String option : unsupported) {
                 defaults.remove(option);
             }
@@ -97,7 +97,7 @@ public abstract class Config implements ConfigurationProvider {
 
     public synchronized void saveConfig(File location, Map<String, Object> config) {
         try {
-            commentStore.writeComments(yaml.get().dump(config), location);
+            commentStore.writeComments(YAML.get().dump(config), location);
         } catch (IOException e) {
             e.printStackTrace();
         }
@@ -128,33 +128,37 @@ public abstract class Config implements ConfigurationProvider {
     }
 
     public <T> T get(String key, Class<T> clazz, T def) {
-        if (this.config.containsKey(key)) {
+        Object o = this.config.get(key);
-            return (T) this.config.get(key);
+        if (o != null) {
+            return (T) o;
         } else {
             return def;
         }
     }
 
     public boolean getBoolean(String key, boolean def) {
-        if (this.config.containsKey(key)) {
+        Object o = this.config.get(key);
-            return (boolean) this.config.get(key);
+        if (o != null) {
+            return (boolean) o;
         } else {
             return def;
         }
     }
 
     public String getString(String key, String def) {
-        if (this.config.containsKey(key)) {
+        final Object o = this.config.get(key);
-            return (String) this.config.get(key);
+        if (o != null) {
+            return (String) o;
         } else {
             return def;
         }
     }
 
     public int getInt(String key, int def) {
-        if (this.config.containsKey(key)) {
+        Object o = this.config.get(key);
-            if (this.config.get(key) instanceof Number) {
+        if (o != null) {
-                return ((Number) this.config.get(key)).intValue();
+            if (o instanceof Number) {
+                return ((Number) o).intValue();
             } else {
                 return def;
             }
@@ -164,9 +168,10 @@ public abstract class Config implements ConfigurationProvider {
     }
 
     public double getDouble(String key, double def) {
-        if (this.config.containsKey(key)) {
+        Object o = this.config.get(key);
-            if (this.config.get(key) instanceof Number) {
+        if (o != null) {
-                return ((Number) this.config.get(key)).doubleValue();
+            if (o instanceof Number) {
+                return ((Number) o).doubleValue();
             } else {
                 return def;
             }
@@ -176,8 +181,9 @@ public abstract class Config implements ConfigurationProvider {
     }
 
     public List<Integer> getIntegerList(String key) {
-        if (this.config.containsKey(key)) {
+        Object o = this.config.get(key);
-            return (List<Integer>) this.config.get(key);
+        if (o != null) {
+            return (List<Integer>) o;
         } else {
             return new ArrayList<>();
         }

jar/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>viaversion-parent</artifactId>
         <groupId>us.myles</groupId>
-        <version>1.5.1-SNAPSHOT</version>
+        <version>1.5.3-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <name>viaversion-jar</name>

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>us.myles</groupId>
     <artifactId>viaversion-parent</artifactId>
-    <version>1.5.1-SNAPSHOT</version>
+    <version>1.5.3-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>viaversion-parent</name>

sponge-legacy/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>viaversion-parent</artifactId>
         <groupId>us.myles</groupId>
-        <version>1.5.1-SNAPSHOT</version>
+        <version>1.5.3-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

sponge/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>viaversion-parent</artifactId>
         <groupId>us.myles</groupId>
-        <version>1.5.1-SNAPSHOT</version>
+        <version>1.5.3-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

sponge/src/main/java/us/myles/ViaVersion/sponge/listeners/protocol1_9to1_8/HandItemCache.java

@@ -33,8 +33,6 @@ public class HandItemCache implements Runnable {
     }
 
     public static Item getHandItem(UUID player) {
-        if (!handCache.containsKey(player))
-            return null;
         return handCache.get(player);
     }