1.21-pre4

api/src/main/java/com/viaversion/viaversion/api/protocol/version/ProtocolVersion.java

@@ -84,7 +84,7 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     public static final ProtocolVersion v1_20_2 = register(764, "1.20.2");
     public static final ProtocolVersion v1_20_3 = register(765, "1.20.3-1.20.4", new SubVersionRange("1.20", 3, 4));
     public static final ProtocolVersion v1_20_5 = register(766, "1.20.5-1.20.6", new SubVersionRange("1.20", 5, 6));
-    public static final ProtocolVersion v1_21 = register(767, 201, "1.21");
+    public static final ProtocolVersion v1_21 = register(767, 202, "1.21");
     public static final ProtocolVersion unknown = new ProtocolVersion(VersionType.SPECIAL, -1, -1, "UNKNOWN", null);
 
     public static ProtocolVersion register(int version, String name) {

common/src/main/java/com/viaversion/viaversion/protocols/v1_20_3to1_20_5/rewriter/EntityPacketRewriter1_20_5.java

@@ -412,13 +412,12 @@ public final class EntityPacketRewriter1_20_5 extends EntityRewriter<Clientbound
             Types1_20_5.ENTITY_DATA_TYPES.blockStateType,
             Types1_20_5.ENTITY_DATA_TYPES.optionalBlockStateType,
             Types1_20_5.ENTITY_DATA_TYPES.particleType,
-            null
+            null,
+            Types1_20_5.ENTITY_DATA_TYPES.componentType,
+            Types1_20_5.ENTITY_DATA_TYPES.optionalComponentType
         );
         registerBlockStateHandler(EntityTypes1_20_5.ABSTRACT_MINECART, 11);
 
-        filter().dataType(Types1_20_5.ENTITY_DATA_TYPES.componentType).handler((event, meta) -> protocol.getComponentRewriter().processTag(event.user(), meta.value()));
-        filter().dataType(Types1_20_5.ENTITY_DATA_TYPES.optionalComponentType).handler((event, meta) -> protocol.getComponentRewriter().processTag(event.user(), meta.value()));
-
         filter().type(EntityTypes1_20_5.LIVING_ENTITY).index(10).handler((event, meta) -> {
             final int effectColor = meta.value();
             if (effectColor == 0) {

common/src/main/java/com/viaversion/viaversion/protocols/v1_20_5to1_21/rewriter/BlockItemPacketRewriter1_21.java

@@ -38,7 +38,6 @@ import com.viaversion.viaversion.rewriter.BlockRewriter;
 import com.viaversion.viaversion.rewriter.StructuredItemRewriter;
 import java.util.Arrays;
 import java.util.List;
-import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class BlockItemPacketRewriter1_21 extends StructuredItemRewriter<ClientboundPacket1_20_5, ServerboundPacket1_20_5, Protocol1_20_5To1_21> {
 
@@ -108,9 +107,9 @@ public final class BlockItemPacketRewriter1_21 extends StructuredItemRewriter<Cl
     }
 
     @Override
-    public @Nullable Item handleItemToClient(final UserConnection connection, @Nullable final Item item) {
+    public Item handleItemToClient(final UserConnection connection, final Item item) {
-        if (item == null) {
+        if (item.isEmpty()) {
-            return null;
+            return item;
         }
 
         super.handleItemToClient(connection, item);
@@ -132,9 +131,9 @@ public final class BlockItemPacketRewriter1_21 extends StructuredItemRewriter<Cl
     }
 
     @Override
-    public @Nullable Item handleItemToServer(final UserConnection connection, @Nullable final Item item) {
+    public Item handleItemToServer(final UserConnection connection, final Item item) {
-        if (item == null) {
+        if (item.isEmpty()) {
-            return null;
+            return item;
         }
 
         super.handleItemToServer(connection, item);

common/src/main/java/com/viaversion/viaversion/protocols/v1_20_5to1_21/rewriter/EntityPacketRewriter1_21.java

@@ -143,7 +143,9 @@ public final class EntityPacketRewriter1_21 extends EntityRewriter<ClientboundPa
             Types1_21.ENTITY_DATA_TYPES.blockStateType,
             Types1_21.ENTITY_DATA_TYPES.optionalBlockStateType,
             Types1_21.ENTITY_DATA_TYPES.particleType,
-            Types1_21.ENTITY_DATA_TYPES.particlesType
+            Types1_21.ENTITY_DATA_TYPES.particlesType,
+            Types1_21.ENTITY_DATA_TYPES.componentType,
+            Types1_21.ENTITY_DATA_TYPES.optionalComponentType
         );
 
         filter().type(EntityTypes1_20_5.ABSTRACT_MINECART).index(11).handler((event, meta) -> {

common/src/main/java/com/viaversion/viaversion/rewriter/EntityRewriter.java

@@ -21,6 +21,7 @@ import com.google.common.base.Preconditions;
 import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.nbt.tag.ListTag;
 import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.data.Int2IntMapMappings;
@@ -32,9 +33,9 @@ import com.viaversion.viaversion.api.data.entity.TrackedEntity;
 import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.RegistryEntry;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
@@ -191,6 +192,10 @@ public abstract class EntityRewriter<C extends ClientboundPacketType, T extends
         registerEntityDataTypeHandler(itemType, null, blockStateType, particleType, null);
     }
 
+    public void registerEntityDataTypeHandler(@Nullable EntityDataType itemType, @Nullable EntityDataType blockStateType, @Nullable EntityDataType optionalBlockStateType, @Nullable EntityDataType particleType, @Nullable EntityDataType particlesType) {
+        registerEntityDataTypeHandler(itemType, blockStateType, optionalBlockStateType, particleType, particlesType, null, null);
+    }
+
     /**
      * Registers an entity data handler to rewrite, item, block, and particle ids stored in entity data.
      *
@@ -199,8 +204,12 @@ public abstract class EntityRewriter<C extends ClientboundPacketType, T extends
      * @param optionalBlockStateType optional block state data type if needed
      * @param particleType           particle data type if needed
      * @param particlesType          particles data type if needed
+     * @param componentType          component data type if needed
+     * @param optionalComponentType  optional component data type if needed
      */
-    public void registerEntityDataTypeHandler(@Nullable EntityDataType itemType, @Nullable EntityDataType blockStateType, @Nullable EntityDataType optionalBlockStateType, @Nullable EntityDataType particleType, @Nullable EntityDataType particlesType) {
+    public void registerEntityDataTypeHandler(@Nullable EntityDataType itemType, @Nullable EntityDataType blockStateType, @Nullable EntityDataType optionalBlockStateType,
+                                              @Nullable EntityDataType particleType, @Nullable EntityDataType particlesType,
+                                              @Nullable EntityDataType componentType, @Nullable EntityDataType optionalComponentType) {
         filter().handler((event, data) -> {
             final EntityDataType type = data.dataType();
             if (type == itemType) {
@@ -220,6 +229,9 @@ public abstract class EntityRewriter<C extends ClientboundPacketType, T extends
                 for (final Particle particle : particles) {
                     rewriteParticle(event.user(), particle);
                 }
+            } else if (type == componentType || type == optionalComponentType) {
+                final Tag component = data.value();
+                protocol.getComponentRewriter().processTag(event.user(), component);
             }
         });
     }

gradle.properties

@@ -1,5 +1,5 @@
 # Project properties - we put these here so they can be modified without causing a recompile of the build scripts
-projectVersion=5.0.0-1.21-pre3-SNAPSHOT
+projectVersion=5.0.0-1.21-pre4-SNAPSHOT
 
 # Smile emoji
 mcVersions=1.20.6,1.20.5,1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2, 1.18.1, 1.18, 1.17.1, 1.17, 1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16, 1.15.2, 1.15.1, 1.15, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14, 1.13.2, 1.13.1, 1.13, 1.12.2, 1.12.1, 1.12, 1.11.2, 1.11.1, 1.11, 1.10.2, 1.10.1, 1.10, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9, 1.8.9

template/src/main/java/com/viaversion/viaversion/template/protocols/rewriter/EntityPacketRewriter1_99.java

@@ -95,7 +95,9 @@ public final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPa
             Types1_20_5.ENTITY_DATA_TYPES.blockStateType,
             Types1_20_5.ENTITY_DATA_TYPES.optionalBlockStateType,
             Types1_20_5.ENTITY_DATA_TYPES.particleType,
-            Types1_20_5.ENTITY_DATA_TYPES.particlesType
+            Types1_20_5.ENTITY_DATA_TYPES.particlesType,
+            Types1_20_5.ENTITY_DATA_TYPES.componentType,
+            Types1_20_5.ENTITY_DATA_TYPES.optionalComponentType
         );
         // Minecarts are special
         registerBlockStateHandler(EntityTypes1_20_5.ABSTRACT_MINECART, 11);