Add EntityCreationEvent

src/main/java/emu/grasscutter/server/event/entity/EntityCreationEvent.java

@@ -0,0 +1,48 @@
+package emu.grasscutter.server.event.entity;
+
+import emu.grasscutter.game.entity.GameEntity;
+import emu.grasscutter.server.event.Event;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+import javax.annotation.Nullable;
+
+/** Invoked when an entity is created. */
+@AllArgsConstructor
+public final class EntityCreationEvent extends Event {
+    /**
+     * Helper method to call EntityCreationEvent.
+     * Returns the result of the event call.
+     *
+     * @param type The type of entity to create.
+     * @return The result of the event call.
+     * @param <T> The type of entity to create.
+     */
+    public static <T extends GameEntity> T call(
+        Class<T> type, Class<?>[] argTypes, Object[] args
+    ) {
+        var event = new EntityCreationEvent(type, argTypes, args);
+        event.call(); return type.cast(event.getEntity());
+    }
+
+    @Getter @Setter private Class<? extends GameEntity> entityType;
+    @Getter @Setter private Class<?>[] constructorArgTypes;
+    @Getter @Setter private Object[] constructorArgs;
+
+    /**
+     * Creates a new entity.
+     * Returns null if the entity could not be created.
+     *
+     * @return The created entity.
+     */
+    @Nullable
+    public GameEntity getEntity() {
+        try {
+            return this.entityType.getConstructor(this.constructorArgTypes)
+                .newInstance(this.constructorArgs);
+        } catch (ReflectiveOperationException ignored) {
+            return null;
+        }
+    }
+}

src/main/java/emu/grasscutter/server/event/types/EntityEvent.java

@@ -7,8 +7,8 @@ import emu.grasscutter.server.event.Event;
 public abstract class EntityEvent extends Event {
     protected final GameEntity entity;
 
-    public EntityEvent(GameEntity player) {
-        this.entity = player;
+    public EntityEvent(GameEntity entity) {
+        this.entity = entity;
     }
 
     public GameEntity getEntity() {