A utility ResultListener that is silent on success, but logs as requested

on failure.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@1502 6335cc39-0255-0410-8fd6-9bcaacd3b74c

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

@@ -0,0 +1,34 @@
+//
+// $Id$
+
+package com.samskivert.util;
+
+
+/**
+ * A ResultListener that does nothing on success and logs a warning
+ * message on failure, that's all.
+ */
+public class ComplainingListener
+    implements ResultListener
+{
+    public ComplainingListener (Log log, String errorText)
+    {
+        _log = log;
+        _errorText = errorText;
+    }
+
+    // documentation inherited from interface ResultListener
+    public void requestCompleted (Object result) { /* nada */ }
+
+    // documentation inherited from interface ResultListener
+    public void requestFailed (Exception cause)
+    {
+        _log.warning(_errorText + " [cause=" + cause + "].");
+    }
+
+    /** The log to which we'll log our error. */
+    protected Log _log;
+
+    /** The text to output if the error happens. */
+    protected String _errorText;
+}