SPIGOT-7799, #1039: Expose explosion world interaction in EntityExplodeEvent and BlockExplodeEvent

By: antiPerson <nathat890@outlook.com>

paper-api/src/main/java/org/bukkit/ExplosionResult.java

@@ -0,0 +1,37 @@
+package org.bukkit;
+
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Represents the outcome of an explosion.
+ */
+@ApiStatus.Experimental
+public enum ExplosionResult {
+
+    /**
+     * Represents an explosion where no change took place.
+     *
+     * This is the case when {@link org.bukkit.GameRule#MOB_GRIEFING} is
+     * disabled.
+     */
+    KEEP,
+    /**
+     * Represents an explosion where all destroyed blocks drop their items.
+     *
+     * This is the case when
+     * {@link org.bukkit.GameRule#TNT_EXPLOSION_DROP_DECAY} or
+     * {@link org.bukkit.GameRule#BLOCK_EXPLOSION_DROP_DECAY} is disabled.
+     */
+    DESTROY,
+    /**
+     * Represents an explosion where explosions cause only some blocks to drop.
+     */
+    DESTROY_WITH_DECAY,
+    /**
+     * Represents an explosion where a block change/update has happened.
+     *
+     * For example, when a wind charge is used it will cause nearby buttons,
+     * levers and bells to be activated.
+     */
+    TRIGGER_BLOCK
+}

paper-api/src/main/java/org/bukkit/event/block/BlockExplodeEvent.java

@@ -1,6 +1,7 @@
 package org.bukkit.event.block;
 
 import java.util.List;
+import org.bukkit.ExplosionResult;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
 import org.bukkit.event.Cancellable;
@@ -20,18 +21,15 @@ public class BlockExplodeEvent extends BlockEvent implements Cancellable {
     private final BlockState blockState;
     private final List<Block> blocks;
     private float yield;
+    private final ExplosionResult result;
 
-    public BlockExplodeEvent(@NotNull final Block what, @NotNull final BlockState blockState, @NotNull final List<Block> blocks, final float yield) {
+    public BlockExplodeEvent(@NotNull final Block what, @NotNull final BlockState blockState, @NotNull final List<Block> blocks, final float yield, @NotNull final ExplosionResult result) {
         super(what);
         this.blockState = blockState;
         this.blocks = blocks;
         this.yield = yield;
         this.cancel = false;
-    }
-
-    @Deprecated(forRemoval = true)
-    public BlockExplodeEvent(@NotNull final Block what, @NotNull final List<Block> blocks, final float yield) {
-        this(what, what.getState(), blocks, yield);
+        this.result = result;
     }
 
     @Override
@@ -44,6 +42,16 @@ public class BlockExplodeEvent extends BlockEvent implements Cancellable {
         this.cancel = cancel;
     }
 
+    /**
+     * Returns the result of the explosion if it is not cancelled.
+     *
+     * @return the result of the explosion
+     */
+    @NotNull
+    public ExplosionResult getExplosionResult() {
+        return result;
+    }
+
     /**
      * Returns the captured BlockState of the block that exploded.
      *

paper-api/src/main/java/org/bukkit/event/entity/EntityExplodeEvent.java

@@ -1,6 +1,7 @@
 package org.bukkit.event.entity;
 
 import java.util.List;
+import org.bukkit.ExplosionResult;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Entity;
@@ -17,13 +18,15 @@ public class EntityExplodeEvent extends EntityEvent implements Cancellable {
     private final Location location;
     private final List<Block> blocks;
     private float yield;
+    private final ExplosionResult result;
 
-    public EntityExplodeEvent(@NotNull final Entity what, @NotNull final Location location, @NotNull final List<Block> blocks, final float yield) {
+    public EntityExplodeEvent(@NotNull final Entity what, @NotNull final Location location, @NotNull final List<Block> blocks, final float yield, @NotNull final ExplosionResult result) {
         super(what);
         this.location = location;
         this.blocks = blocks;
         this.yield = yield;
         this.cancel = false;
+        this.result = result;
     }
 
     @Override
@@ -36,6 +39,16 @@ public class EntityExplodeEvent extends EntityEvent implements Cancellable {
         this.cancel = cancel;
     }
 
+    /**
+     * Returns the result of the explosion if it is not cancelled.
+     *
+     * @return the result of the explosion
+     */
+    @NotNull
+    public ExplosionResult getExplosionResult() {
+        return result;
+    }
+
     /**
      * Returns the list of blocks that would have been removed or were removed
      * from the explosion event.