Allow ComplainingListener to be properly typed and to use Java's Logger.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2131 6335cc39-0255-0410-8fd6-9bcaacd3b74c

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

@@ -3,13 +3,14 @@
 
 package com.samskivert.util;
 
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
- * A ResultListener that does nothing on success and logs a warning
+ * A ResultListener that does nothing on success and logs a warning message on failure, that's all.
- * message on failure, that's all.
  */
-public class ComplainingListener
+public class ComplainingListener<T>
-    implements ResultListener
+    implements ResultListener<T>
 {
     public ComplainingListener (Log log, String errorText)
     {
@@ -17,18 +18,33 @@ public class ComplainingListener
         _errorText = errorText;
     }
 
+    public ComplainingListener (Logger logger, String errorText)
+    {
+        _logger = logger;
+        _errorText = errorText;
+    }
+
     // documentation inherited from interface ResultListener
-    public void requestCompleted (Object result) { /* nada */ }
+    public void requestCompleted (T result) { /* nada */ }
 
     // documentation inherited from interface ResultListener
     public void requestFailed (Exception cause)
     {
-        _log.warning(_errorText + " [cause=" + cause + "].");
+        if (_log != null) {
+            _log.warning(_errorText + " [cause=" + cause + "].");
+        } else if (_logger != null) {
+            _logger.log(Level.WARNING, _errorText, cause);
+        } else {
+            System.err.println(_errorText + " [cause=" + cause + "].");
+        }
     }
 
-    /** The log to which we'll log our error. */
+    /** The log to which we'll log our error, may be null. */
     protected Log _log;
 
+    /** The logger to which we'll log our error, may be null. */
+    protected Logger _logger;
+
     /** The text to output if the error happens. */
     protected String _errorText;
 }