SPIGOT-5526: Add EntityEnterBlockEvent

By: BlackHole <black-hole@live.com>

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

@@ -0,0 +1,59 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Called when an {@link Entity} enters a block and is stored in that block.
+ * <p>
+ * This event is called for bees entering a bee hive.
+ * <br>
+ * It is not called when a silverfish "enters" a stone block. For that listen to
+ * the {@link EntityChangeBlockEvent}.
+ */
+public class EntityEnterBlockEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private final Block block;
+    private boolean cancel;
+
+    public EntityEnterBlockEvent(@NotNull final Entity entity, @NotNull final Block block) {
+        super(entity);
+
+        this.block = block;
+    }
+
+    /**
+     * Get the block the entity will enter.
+     *
+     * @return the block
+     */
+    @NotNull
+    public Block getBlock() {
+        return block;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancel;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancel = cancel;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}