Added Cancellable interface

src/org/bukkit/event/Cancellable.java

@@ -0,0 +1,6 @@
+package org.bukkit.event;
+
+public interface Cancellable {
+	public boolean isCancelled();
+	public void setCancelled(boolean cancel);
+}

src/org/bukkit/event/block/BlockPlacedEvent.java

@@ -1,19 +1,32 @@
 package org.bukkit.event.block;
 
 import org.bukkit.Block;
+import org.bukkit.event.Cancellable;
 
 /**
  * Not implemented yet
  */
-public class BlockPlacedEvent extends BlockEvent {
+public class BlockPlacedEvent extends BlockEvent implements Cancellable {
-
+	private boolean cancel;
+	
 	/**
 	 * @param type
 	 * @param theBlock
 	 */
 	public BlockPlacedEvent(Type type, Block theBlock) {
 		super(type, theBlock);
-		// TODO Auto-generated constructor stub
+		cancel = false;
+	}
+
+	@Override
+	public boolean isCancelled() {
+		// TODO Auto-generated method stub
+		return cancel;
+	}
+
+	@Override
+	public void setCancelled(boolean cancel) {
+		this.cancel = cancel;
 	}
 
 }

src/org/bukkit/event/player/PlayerChatEvent.java

@@ -2,11 +2,12 @@
 package org.bukkit.event.player;
 
 import org.bukkit.Player;
+import org.bukkit.event.Cancellable;
 
 /**
  * Holds information for player chat and commands
  */
-public class PlayerChatEvent extends PlayerEvent {
+public class PlayerChatEvent extends PlayerEvent implements Cancellable {
     private boolean cancel = false;
     private String message;
 

src/org/bukkit/event/player/PlayerMoveEvent.java

@@ -3,12 +3,13 @@ package org.bukkit.event.player;
 
 import org.bukkit.Location;
 import org.bukkit.Player;
+import org.bukkit.event.Cancellable;
 import org.bukkit.event.Event;
 
 /**
  * Holds information for player movement and teleportation events
  */
-public class PlayerMoveEvent extends PlayerEvent {
+public class PlayerMoveEvent extends PlayerEvent implements Cancellable {
     private boolean cancel = false;
     private Location from;
     private Location to;