It's an ObserverList! It's a ResultListener! It multiplexes results to many

ResultListeners and still has time to keep your code clean!


git-svn-id: https://samskivert.googlecode.com/svn/trunk@1487 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/util/ResultListenerList.java

@@ -0,0 +1,55 @@
+//
+// $Id$
+
+package com.samskivert.util;
+
+/**
+ * Multiplexes ResultListener responses to multiple ResultListeners.
+ */
+public class ResultListenerList extends ObserverList
+    implements ResultListener
+{
+    /**
+     * Create a ResultListenerList with the FAST_UNSAFE_NOTIFY policy.
+     */
+    public ResultListenerList ()
+    {
+        super(FAST_UNSAFE_NOTIFY);
+    }
+
+    /**
+     * Create a ResultListenerList with your own notifyPolicy.
+     */
+    public ResultListenerList (int notifyPolicy)
+    {
+        super(notifyPolicy);
+    }
+
+    /**
+     * Multiplex a requestCompleted response to all the ResultListeners in
+     * this list.
+     */
+    public void requestCompleted (final Object result)
+    {
+        apply(new ObserverOp() {
+            public boolean apply (Object observer) {
+                ((ResultListener) observer).requestCompleted(result);
+                return true;
+            }
+        });
+    }
+
+    /**
+     * Multiplex a requestFailed response to all the ResultListeners in
+     * this list.
+     */
+    public void requestFailed (final Exception cause)
+    {
+        apply(new ObserverOp() {
+            public boolean apply (Object observer) {
+                ((ResultListener) observer).requestFailed(cause);
+                return true;
+            }
+        });
+    }
+}