Added BlockCanBuild Event. Fixed Event enumeration

src/org/bukkit/event/Event.java

@@ -76,7 +76,8 @@ public abstract class Event {
         /** 
     	 * Block Events
     	 */
-        BLOCK_DAMAGED (Category.BLOCK),
+        BLOCK_BROKEN (Category.BLOCK),
+        BLOCK_CANBUILD (Category.BLOCK),
         BLOCK_FLOW (Category.BLOCK),
         BLOCK_IGNITE (Category.BLOCK),
         BLOCK_PHYSICS (Category.BLOCK),

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

@@ -0,0 +1,28 @@
+/**
+ * 
+ */
+package org.bukkit.event.block;
+
+import org.bukkit.Block;
+import org.bukkit.event.Cancellable;
+
+/**
+ * @author durron597
+ */
+public class BlockCanBuildEvent extends BlockEvent implements Cancellable {
+	protected boolean cancel;
+	
+	public BlockCanBuildEvent(Type type, Block block) {
+		super(type, block);
+	}
+	
+	@Override
+	public boolean isCancelled() {
+		return cancel;
+	}
+
+	@Override
+	public void setCancelled(boolean cancel) {
+		this.cancel = cancel;
+	}
+}

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

@@ -22,6 +22,12 @@ public class BlockListener implements Listener {
     public void onBlockBroken(BlockBrokenEvent event) {
     }
 
+    /**
+     * Called when we try to place a block, to see if we can build it
+     */
+    public void canBuild(BlockCanBuildEvent event) {
+    }
+    
     /**
      * Called when a block flows (water/lava)
      *