Added Block.getPistonMoveReaction, BlockPistonExtend and BlockPistonRetractEvent

src/main/java/org/bukkit/event/block/BlockPistonEvent.java

@@ -0,0 +1,43 @@
+package org.bukkit.event.block;
+
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.bukkit.event.Cancellable;
+import org.bukkit.material.PistonBaseMaterial;
+
+public abstract class BlockPistonEvent extends BlockEvent implements Cancellable                                                                                                                                                              {
+    private boolean cancelled;
+
+    public BlockPistonEvent(Type type, Block block) {
+        super(type, block);
+    }
+
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    public void setCancelled(boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+
+    /**
+     * Returns true if the Piston in the event is sticky.
+     *
+     * @return stickiness of the piston
+     */
+    public boolean isSticky() {
+        return block.getType() == Material.PISTON_STICKY_BASE;
+    }
+
+    /**
+     * Return the direction in which the piston will operate.
+     *
+     * @return direction of the piston
+     */
+    public BlockFace getDirection() {
+        // Both are meh!
+        // return ((PistonBaseMaterial) block.getType().getNewData(block.getData                                                                                                                                                             ())).getFacing();
+        return ((PistonBaseMaterial) block.getState().getData()).getFacing();
+    }
+}