Add CopperGolemWeatheringEvent

Author: Axyss

paper-api/src/main/java/io/papermc/paper/event/entity/CopperGolemWeatheringEvent.java

@@ -0,0 +1,77 @@
+package io.papermc.paper.event.entity;
+
+import io.papermc.paper.world.WeatheringCopperState;
+import org.bukkit.entity.CopperGolem;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when a {@link CopperGolem} transitions from one {@link WeatheringCopperState} to another.
+ */
+@NullMarked
+public class CopperGolemWeatheringEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final WeatheringCopperState weatherState;
+    private final WeatheringCopperState nextWeatherState;
+
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public CopperGolemWeatheringEvent(final CopperGolem golem, final WeatheringCopperState weatherState, final WeatheringCopperState nextWeatherState) {
+        super(golem);
+        this.weatherState = weatherState;
+        this.nextWeatherState = nextWeatherState;
+    }
+
+    /**
+     * Gets the copper golem entity that is about to weather.
+     *
+     * @return The copper golem entity about to weather.
+     */
+    @Override
+    public CopperGolem getEntity() {
+        return (CopperGolem) super.getEntity();
+    }
+
+    /**
+     * Gets the current weathering state of the copper golem.
+     *
+     * @return The current weathering state.
+     */
+    public WeatheringCopperState getWeatheringState() {
+        return weatherState;
+    }
+
+    /**
+     * Gets the next weathering state the copper golem will transition to.
+     *
+     * @return The next weathering state.
+     */
+    public WeatheringCopperState getNextWeatheringState() {
+        return nextWeatherState;
+    }
+    
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+    
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+    
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+    
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}

paper-server/patches/sources/net/minecraft/world/entity/animal/coppergolem/CopperGolem.java.patch

@@ -37,6 +37,26 @@
                  this.gameEvent(GameEvent.SHEAR, player);
                  itemInHand.hurtAndBreak(1, player, hand);
              }
+@@ -267,9 +_,18 @@
+                 boolean flag = weatherState.equals(WeatheringCopper.WeatherState.OXIDIZED);
+                 if (gameTime >= this.nextWeatheringTick && !flag) {
+                     WeatheringCopper.WeatherState weatherState1 = weatherState.next();
++                    // Paper start - CopperGolemWeatheringEvent
++                    io.papermc.paper.event.entity.CopperGolemWeatheringEvent event = new io.papermc.paper.event.entity.CopperGolemWeatheringEvent(
++                        (org.bukkit.entity.CopperGolem) this.getBukkitEntity(),
++                        io.papermc.paper.world.WeatheringCopperState.valueOf(weatherState.name()),
++                        io.papermc.paper.world.WeatheringCopperState.valueOf(weatherState1.name())
++                    );
++                    event.callEvent();
++                    // Paper end - CopperGolemWeatheringEvent
+                     boolean flag1 = weatherState1.equals(WeatheringCopper.WeatherState.OXIDIZED);
+-                    this.setWeatherState(weatherState1);
++                    if (!event.isCancelled()) this.setWeatherState(weatherState1); // Paper - CopperGolemWeatheringEvent
+                     this.nextWeatheringTick = flag1 ? 0L : this.nextWeatheringTick + random.nextIntBetweenInclusive(504000, 552000);
++                    if (event.isCancelled()) return; // Paper - CopperGolemWeatheringEvent
+                 }
+ 
+                 if (flag && this.canTurnToStatue(level)) {
 @@ -285,20 +_,27 @@
 
      private void turnToStatue(ServerLevel level) {