A ResultListener created for easy listener chaining.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@1716 6335cc39-0255-0410-8fd6-9bcaacd3b74c

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

@@ -0,0 +1,45 @@
+//
+// samskivert library - useful routines for java programs
+// Copyright (C) 2001-2004 Michael Bayne
+// 
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.util;
+
+/**
+ * A result listener that contains another result listener to which failure is
+ * passed directly, but allows for success to be handled in whatever way is
+ * desired by the chaining result listener.
+ */
+public abstract class ChainedResultListener
+    implements ResultListener
+{
+    /**
+     * Creates a chained result listener that will pass failure through to the
+     * specified target.
+     */
+    public ChainedResultListener (ResultListener target)
+    {
+        _target = target;
+    }
+
+    // documentation inherited from interface ResultListener
+    public void requestFailed (Exception cause)
+    {
+        _target.requestFailed(cause);
+    }
+
+    protected ResultListener _target;
+}