From 15ff048a273e6666eea42d4f8774b9576f00a017 Mon Sep 17 00:00:00 2001
From: Michael Bayne <mdb@threerings.net>
Date: Tue, 23 Oct 2001 23:56:12 +0000
Subject: [PATCH] Created mechanism for listeners to hear about object death.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@535 542714f4-19e9-0310-aa3c-eee0fc999fb1
---
 .../presents/dobj/ObjectDeathListener.java    | 21 +++++++++++++++++++
 .../presents/dobj/ObjectDestroyedEvent.java   | 16 ++++++++++----
 2 files changed, 33 insertions(+), 4 deletions(-)
 create mode 100644 src/java/com/threerings/presents/dobj/ObjectDeathListener.java

diff --git a/src/java/com/threerings/presents/dobj/ObjectDeathListener.java b/src/java/com/threerings/presents/dobj/ObjectDeathListener.java
new file mode 100644
index 000000000..d285d70ff
--- /dev/null
+++ b/src/java/com/threerings/presents/dobj/ObjectDeathListener.java
@@ -0,0 +1,21 @@
+//
+// $Id: ObjectDeathListener.java,v 1.1 2001/10/23 23:56:12 mdb Exp $
+
+package com.threerings.presents.dobj;
+
+/**
+ * Implemented by entites which wish to hear about object destruction
+ * events.
+ *
+ * @see DObject#addListener
+ */
+public interface ObjectDeathListener
+{
+    /**
+     * Called when this object has been destroyed. This will be called
+     * <em>after</em> the event has been applied to the object.
+     *
+     * @param event The event that was dispatched on the object.
+     */
+    public void objectDestroyed (ObjectDestroyedEvent event);
+}
diff --git a/src/java/com/threerings/presents/dobj/ObjectDestroyedEvent.java b/src/java/com/threerings/presents/dobj/ObjectDestroyedEvent.java
index 468084890..725b33539 100644
--- a/src/java/com/threerings/presents/dobj/ObjectDestroyedEvent.java
+++ b/src/java/com/threerings/presents/dobj/ObjectDestroyedEvent.java
@@ -1,5 +1,5 @@
 //
-// $Id: ObjectDestroyedEvent.java,v 1.2 2001/10/11 04:07:52 mdb Exp $
+// $Id: ObjectDestroyedEvent.java,v 1.3 2001/10/23 23:56:12 mdb Exp $
 
 package com.threerings.presents.dobj;
 
@@ -39,9 +39,7 @@ public class ObjectDestroyedEvent extends TypedEvent
     {
     }
 
-    /**
-     * Applies this attribute change to the object.
-     */
+    // documentation inherited
     public boolean applyToObject (DObject target)
         throws ObjectAccessException
     {
@@ -50,11 +48,21 @@ public class ObjectDestroyedEvent extends TypedEvent
         return true;
     }
 
+    // documentation inherited
     public short getType ()
     {
         return TYPE;
     }
 
+    // documentation inherited
+    protected void notifyListener (Object listener)
+    {
+        if (listener instanceof ObjectDeathListener) {
+            ((ObjectDeathListener)listener).objectDestroyed(this);
+        }
+    }
+
+    // documentation inherited
     protected void toString (StringBuffer buf)
     {
         buf.append("DESTROY:");