Bugfix: If the first event is not issued over an event producer, the fallback logging event listener was not installed.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@649477 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/apps/FOUserAgent.java

 import org.apache.fop.events.DefaultEventBroadcaster;
 import org.apache.fop.events.Event;
 import org.apache.fop.events.EventBroadcaster;
-import org.apache.fop.events.EventProducer;
+import org.apache.fop.events.EventListener;
 import org.apache.fop.events.FOPEventListenerProxy;
 import org.apache.fop.events.LoggingEventListener;
 import org.apache.fop.fo.FOEventHandler;
 
     private class FOPEventBroadcaster extends DefaultEventBroadcaster {
 
-        private FOPEventListenerProxy rootListener;
+        private EventListener rootListener;
         
         public FOPEventBroadcaster() {
-            this.rootListener = new FOPEventListenerProxy(
-                    this.listeners, FOUserAgent.this);
+            //Install a temporary event listener that catches the first event to
+            //do some initialization.
+            this.rootListener = new EventListener() {
+                public void processEvent(Event event) {
+                    if (!listeners.hasEventListeners()) {
+                        //Backwards-compatibility: Make sure at least the LoggingEventListener is
+                        //plugged in so no events are just silently swallowed.
+                        addEventListener(
+                                new LoggingEventListener(LogFactory.getLog(FOUserAgent.class)));
+                    }
+                    //Replace with final event listener
+                    rootListener = new FOPEventListenerProxy(
+                            listeners, FOUserAgent.this);
+                    rootListener.processEvent(event);
+                }
+            };
         }
         
         /** {@inheritDoc} */
             rootListener.processEvent(event);
         }
 
-        /** {@inheritDoc} */
-        protected EventProducer createProxyFor(Class clazz) {
-            if (!this.listeners.hasEventListeners()) {
-                //Backwards-compatibility: Make sure at least the LoggingEventListener is plugged
-                //in so no events are just silently swallowed.
-                addEventListener(
-                        new LoggingEventListener(LogFactory.getLog(FOUserAgent.class)));
-                
-            }
-            return super.createProxyFor(clazz);
-        }
-        
     }
     
 }