feature(#13558): add copper golem state api

paper-api/src/main/java/org/bukkit/entity/CopperGolem.java

@@ -25,6 +25,20 @@ public interface CopperGolem extends Golem, Shearable {
      */
     void setWeatheringState(WeatheringCopperState state);
 
+    /**
+     * Get the current copper golem state of the copper golem.
+     *
+     * @return the copper golem state
+     */
+    CopperGolem.State getState();
+
+    /**
+     * Set the copper golem state of the copper golem.
+     *
+     * @param state the new copper golem state
+     */
+    void setState(CopperGolem.State state);
+
     /**
      * Get the current oxidizing state of the copper golem.
      *
@@ -125,4 +139,37 @@ sealed interface AtTime extends Oxidizing permits AtTimeImpl {
         @ApiStatus.Internal
         record AtTimeImpl(long time) implements AtTime {}
     }
+
+    @NullMarked
+    enum State {
+        // Start generate - CopperGolemState
+        IDLE("idle"),
+        GETTING_ITEM("getting_item"),
+        GETTING_NO_ITEM("getting_no_item"),
+        DROPPING_ITEM("dropping_item"),
+        DROPPING_NO_ITEM("dropping_no_item");
+        // End generate - CopperGolemState
+
+        public static final net.kyori.adventure.util.Index<String, State> NAMES = net.kyori.adventure.util.Index.create(State.class, State::getId);
+
+        private final String id;
+
+        State(String id) {
+            this.id = id;
+        }
+
+        /**
+         * Get the string id of this display slot.
+         *
+         * @return the string id
+         */
+        public String getId() {
+            return this.id;
+        }
+
+        @Override
+        public String toString() {
+            return this.id;
+        }
+    }
 }

paper-generator/src/main/java/io/papermc/generator/Rewriters.java

@@ -66,6 +66,7 @@
 import org.bukkit.entity.Boat;
 import org.bukkit.entity.Cat;
 import org.bukkit.entity.Chicken;
+import org.bukkit.entity.CopperGolem;
 import org.bukkit.entity.Cow;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Fox;
@@ -142,6 +143,13 @@ protected EnumValue.Builder rewriteEnumValue(net.minecraft.world.entity.animal.p
             .register("SoundCategory", SoundCategory.class, new EnumCloneRewriter<>(SoundSource.class))
             .register("AttributeSentiment", Attribute.Sentiment.class, new EnumCloneRewriter<>(net.minecraft.world.entity.ai.attributes.Attribute.Sentiment.class))
             .register("WeatheringCopperState", WeatheringCopperState.class, new EnumCloneRewriter<>(WeatheringCopper.WeatherState.class))
+            .register("CopperGolemState", CopperGolem.State.class, new EnumCloneRewriter<>(net.minecraft.world.entity.animal.golem.CopperGolemState.class) {
+                @Override
+                protected EnumValue.Builder rewriteEnumValue(net.minecraft.world.entity.animal.golem.CopperGolemState state) {
+                    final String name = Formatting.formatKeyAsField(state.getSerializedName());
+                    return EnumValue.builder(name).argument(quoted(state.getSerializedName()));
+                }
+            })
             .register(ClientOption.class, composite(
                 holder("ChatVisibility", ClientOption.ChatVisibility.class, new EnumCloneRewriter<>(ChatVisiblity.class) {
                     @Override

paper-server/patches/sources/net/minecraft/world/entity/animal/golem/CopperGolemState.java.patch

@@ -0,0 +1,11 @@
+--- a/net/minecraft/world/entity/animal/golem/CopperGolemState.java
++++ b/net/minecraft/world/entity/animal/golem/CopperGolemState.java
+@@ -15,7 +_,7 @@
+     DROPPING_ITEM("dropping_item", 3),
+     DROPPING_NO_ITEM("dropping_no_item", 4);
+
+-    public static final Codec<CopperGolemState> CODEC = StringRepresentable.fromEnum(CopperGolemState::values);
++    public static final StringRepresentable.EnumCodec<CopperGolemState> CODEC = StringRepresentable.fromEnum(CopperGolemState::values); // Paper - support copper golem state api mapping byName
+     private static final IntFunction<CopperGolemState> BY_ID = ByIdMap.continuous(CopperGolemState::id, values(), ByIdMap.OutOfBoundsStrategy.ZERO);
+     public static final StreamCodec<ByteBuf, CopperGolemState> STREAM_CODEC = ByteBufCodecs.idMapper(BY_ID, CopperGolemState::id);
+     private final String name;

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftCopperGolem.java

@@ -30,6 +30,18 @@ public void setWeatheringState(final WeatheringCopperState state) {
         this.getHandle().setWeatherState(WeatheringCopper.WeatherState.valueOf(state.name()));
     }
 
+    @Override
+    public CopperGolem.State getState() {
+        return State.NAMES.valueOrThrow(this.getHandle().getState().getSerializedName());
+    }
+
+    @Override
+    public void setState(final CopperGolem.State state) {
+        Preconditions.checkArgument(state != null, "state cannot be null");
+        net.minecraft.world.entity.animal.golem.CopperGolemState vanilla = net.minecraft.world.entity.animal.golem.CopperGolemState.CODEC.byName(state.getId());
+        this.getHandle().setState(vanilla);
+    }
+
     @Override
     public Oxidizing getOxidizing() {
         long value = this.getHandle().nextWeatheringTick;