Merged revisions 647692,647742,647745 via svnmerge from

https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk

................
  r647692 | jeremias | 2008-04-14 09:25:22 +0100 (Mon, 14 Apr 2008) | 3 lines
  
  Initialized merge tracking via "svnmerge" with revisions "1-615152" from 
  https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_ProcessingFeedback
................
  r647742 | jeremias | 2008-04-14 12:53:29 +0100 (Mon, 14 Apr 2008) | 298 lines
  
  Merged branch
  https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_ProcessingFeedback
  into Trunk.
  
  Changes on branch:
  ........
    r615153 | jeremias | 2008-01-25 10:07:21 +0100 (Fr, 25 Jan 2008) | 1 line
    
    Created temporary branch for processing feedback.
  ........
    r615155 | jeremias | 2008-01-25 10:11:59 +0100 (Fr, 25 Jan 2008) | 1 line
    
    Initial commit of what I've built already for those who prefer code to minimalistic design docs.
  ........
    r615278 | jeremias | 2008-01-25 18:25:00 +0100 (Fr, 25 Jan 2008) | 1 line
    
    EventProducer interfaces now operational.
  ........
    r615773 | jeremias | 2008-01-28 10:06:16 +0100 (Mo, 28 Jan 2008) | 1 line
    
    No casting in client code when creating EventProducer instances.
  ........
    r616242 | vhennebert | 2008-01-29 11:34:45 +0100 (Di, 29 Jan 2008) | 3 lines
    
    Trick to avoid hard-coding the class name of EventProducer in the source file.
    Feel free to revert if it's not ok.
  ........
    r616900 | jeremias | 2008-01-30 21:59:31 +0100 (Mi, 30 Jan 2008) | 1 line
    
    Generate event model XMLs in to the build directory: build/gensrc and build/test-gensrc (the latter is new and needs to be setup as source folder in your IDE!)
  ........
    r616907 | jeremias | 2008-01-30 22:12:59 +0100 (Mi, 30 Jan 2008) | 1 line
    
    Added an XMLResourceBundle that uses an XML file instead of a properties file to load the translations. The XML format is the same as for Cocoon's XMLResourceBundle.
  ........
    r617097 | vhennebert | 2008-01-31 11:53:21 +0100 (Do, 31 Jan 2008) | 2 lines
    
    Minor typo + slight improvement of Javadoc
  ........
    r617176 | jeremias | 2008-01-31 19:14:19 +0100 (Do, 31 Jan 2008) | 5 lines
    
    Renamed FopEvent to Event as suggested by Simon.
    EventProducerCollectorTask.java now reads the EventSeverity from a doclet tag.
    Added generation of EventProducer translations (including simple merging, no validation, yet)
    EventFormatter introduced (only basic functionality, yet).
    Added a simple EventListener implementation that uses EventFormatter to convert the events to human-readable, localized messages that are sent to the log via Commons Logging.
  ........
    r617362 | jeremias | 2008-02-01 08:18:07 +0100 (Fr, 01 Feb 2008) | 1 line
    
    Some remaining rename operations based on an earlier discussion.
  ........
    r617413 | jeremias | 2008-02-01 10:46:26 +0100 (Fr, 01 Feb 2008) | 2 lines
    
    Extracted formatting functionality into utility class AdvancedMessageFormat.java.
    AdvancedMessageFormat.java now supports conditional sub-groups (delimited by []).
  ........
    r618682 | jeremias | 2008-02-05 17:07:08 +0100 (Di, 05 Feb 2008) | 1 line
    
    Add support for special object formatters (where toString() isn't good enough). ATM, it's hard-coded but could later be hooked into dynamic discovery if we have multiple such formatters. The SAX Locator is the only example for now.
  ........
    r618686 | jeremias | 2008-02-05 17:12:56 +0100 (Di, 05 Feb 2008) | 3 lines
    
    Hooked most of FONode into the new event mechanism. The FOUserAgent provides a DefaultEventBroadcaster instance.
    If a producer method declares throwing an exception, the event is automatically marked FATAL and the dynamic proxy throws an exception right after notifying the listeners.
    The exceptions are created through the EventExceptionManager. It currently contains only one exception factory for ValidationException. If we need more such factories it's better to register them dynamically. Right now, they're hard-coded.
  ........
    r619313 | jeremias | 2008-02-07 10:14:15 +0100 (Do, 07 Feb 2008) | 1 line
    
    Make sure no events are now just silently swallowed because after upgrading a user doesn't know about the event system.
  ........
    r619314 | jeremias | 2008-02-07 10:14:46 +0100 (Do, 07 Feb 2008) | 1 line
    
    Log what translation file is being written.
  ........
    r619320 | jeremias | 2008-02-07 10:31:00 +0100 (Do, 07 Feb 2008) | 2 lines
    
    FObj hooked into the event system.
    Code reduction using a protected method on FONode to acquire a FOValidationEventProducer.
  ........
    r619359 | jeremias | 2008-02-07 11:59:19 +0100 (Do, 07 Feb 2008) | 2 lines
    
    Fop's QName now extends XGCommons' QName to initiate a transition.
    Hooked PropertyList into the event mechanism.
  ........
    r631252 | jeremias | 2008-02-26 16:24:33 +0100 (Di, 26 Feb 2008) | 1 line
    
    Removed superfluous warning.
  ........
    r631268 | jeremias | 2008-02-26 17:08:11 +0100 (Di, 26 Feb 2008) | 1 line
    
    Deprecated two methods which are a problem for localization. Also helps finding additional spots to switch over to the event mechanism.
  ........
    r633852 | jeremias | 2008-03-05 15:20:24 +0100 (Mi, 05 Mrz 2008) | 1 line
    
    Add severity to formatting parameters.
  ........
    r633855 | jeremias | 2008-03-05 15:21:57 +0100 (Mi, 05 Mrz 2008) | 4 lines
    
    Added support for additional field styles:
    {<fieldname>,if,<true-text>,<false-text>}
    {<fieldname>,equals,<test-string>,<true-text>,<false-text>}
  ........
    r633856 | jeremias | 2008-03-05 15:24:04 +0100 (Mi, 05 Mrz 2008) | 2 lines
    
    Javadocs and TODOs.
    EventListeners can change the event severity.
  ........
    r633857 | jeremias | 2008-03-05 15:27:08 +0100 (Mi, 05 Mrz 2008) | 4 lines
    
    Javadocs.
    Moved out event listener registration into a CompositeEventListener.
    Event broadcaster uses the events effective severity, not the initial value (for the case where listeners override the initial value).
    Set up a special EventBroadCaster in the FOUserAgent that filters events through a class (FOValidationEventListenerProxy) that adjusts the event severity for relaxed validation.
  ........
    r633858 | jeremias | 2008-03-05 15:32:07 +0100 (Mi, 05 Mrz 2008) | 2 lines
    
    Instead of always decentrally checking whether strict validation is enabled or not, this is now done in a special event listener. The event producer method caller simply indicates whether it can recover from the error condition and continue.
    Started switching to event production in table FOs.
  ........
    r634027 | jeremias | 2008-03-05 21:58:35 +0100 (Mi, 05 Mrz 2008) | 7 lines
    
    Moved AdvancedMessageFormat into its own package.
    AdvancedMessageFormat got the following added functionality:
    - Alternative conditional regions [ bla {field}] -> [ bla {field1}| even more bla {field2}]
    - Functions: functions get access to the parameters and they can produce an object that is then formatted ({#gatherContextInfo})
    - "if" and "equals" format moved to top-level classes and added by dynamic registration.
    EventFormatter now supports includes in the form {{includeName}} so you can include other entries from the resource bundle for better reuse.
    Some more events in table code.
  ........
    r634031 | jeremias | 2008-03-05 22:05:22 +0100 (Mi, 05 Mrz 2008) | 1 line
    
    SVN Props
  ........
    r634208 | jeremias | 2008-03-06 11:26:52 +0100 (Do, 06 Mrz 2008) | 2 lines
    
    Improved context gathering.
    Moved GatherContextInfoFunction to an inner class of FONode to reduce visibilities.
  ........
    r634209 | jeremias | 2008-03-06 11:28:14 +0100 (Do, 06 Mrz 2008) | 1 line
    
    Made FOPException localizable.
  ........
    r634280 | jeremias | 2008-03-06 15:38:30 +0100 (Do, 06 Mrz 2008) | 2 lines
    
    ExceptionFactory is now dynamically registered.
    More table warnings and errors switch to events.
  ........
    r634326 | jeremias | 2008-03-06 17:08:16 +0100 (Do, 06 Mrz 2008) | 1 line
    
    Remaining table FOs switched to events.
  ........
    r634328 | jeremias | 2008-03-06 17:09:21 +0100 (Do, 06 Mrz 2008) | 1 line
    
    Deprecated FOP's QName. Mixing with Commons' variant only produces problems.
  ........
    r634381 | jeremias | 2008-03-06 20:12:57 +0100 (Do, 06 Mrz 2008) | 2 lines
    
    Made the "invalidChild" event fully localizable by adding a "lookup" field for the optional rule to be displayed.
    And a few switches to the event system.
  ........
    r634692 | jeremias | 2008-03-07 15:31:43 +0100 (Fr, 07 Mrz 2008) | 1 line
    
    More FO tree stuff switched to events.
  ........
    r634712 | jeremias | 2008-03-07 16:19:21 +0100 (Fr, 07 Mrz 2008) | 1 line
    
    Avoid an NPE that says nothing (ex. could happen if the message template is wrong).
  ........
    r634738 | jeremias | 2008-03-07 17:38:21 +0100 (Fr, 07 Mrz 2008) | 2 lines
    
    Non-FO children were not properly run through validation by FOTreeBuilder.
    Unified the way that non-FO elements are validated. Some FOs were already fixed. I now fixed the rest, so foreign elements can occur everywhere.
  ........
    r637833 | jeremias | 2008-03-17 12:01:41 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Exception while cloning for RetrieveMarker to be handled by user as suggested by Andreas.
  ........
    r637835 | jeremias | 2008-03-17 12:03:31 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Throw a RuntimeException of no other Exception class is specified for an event as a fallback if someone just sets the event severity to FATAL.
  ........
    r637838 | jeremias | 2008-03-17 12:06:10 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Throw a meaningful exception when the property name is wrong. Otherwise, there will be an ArrayIndexOutOfBoundsException.
  ........
    r637859 | jeremias | 2008-03-17 13:35:26 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Throw a meaningful exception when the property name is wrong. Otherwise, there will be an ArrayIndexOutOfBoundsException.
  ........
    r637938 | jeremias | 2008-03-17 16:19:51 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Switched pagination package to events.
  ........
    r637947 | jeremias | 2008-03-17 16:45:16 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Removed unlocalizable validation helper methods.
  ........
    r637952 | jeremias | 2008-03-17 16:59:02 +0100 (Mo, 17 Mrz 2008) | 1 line
    
    Events on FOTreeBuilder.
  ........
    r638299 | jeremias | 2008-03-18 11:09:30 +0100 (Di, 18 Mrz 2008) | 2 lines
    
    Added support for java.util.text's ChoiceFormat to AdvancedMessageFormat.
    Reuse the regexes as constants.
  ........
    r638302 | jeremias | 2008-03-18 11:17:06 +0100 (Di, 18 Mrz 2008) | 1 line
    
    Events for inline-level layout managers.
  ........
    r638774 | jeremias | 2008-03-19 11:17:36 +0100 (Mi, 19 Mrz 2008) | 1 line
    
    Added DEBUG level.
  ........
    r638777 | jeremias | 2008-03-19 11:23:40 +0100 (Mi, 19 Mrz 2008) | 3 lines
    
    Generalized FOValidationEventListenerProxy into FOPEventListenerProxy, the main proxy for FOP's own event manipulation proxy. Done because of support for overflow="hidden" vs. overflow="error-if-overflow".
    Switched block-level layout managers to events.
    Some cleanup along the way.
  ........
    r639222 | jeremias | 2008-03-20 10:27:34 +0100 (Do, 20 Mrz 2008) | 2 lines
    
    Some initial work for event forwarding from Batik.
    Missing errors/exceptions converted to events in PageSequenceMaster.
  ........
    r639270 | jeremias | 2008-03-20 13:50:35 +0100 (Do, 20 Mrz 2008) | 1 line
    
    Removed DEBUG event severity again. Promoted constrained geometry adjustment event to INFO level as per discussion.
  ........
    r640395 | jeremias | 2008-03-24 13:39:13 +0100 (Mo, 24 Mrz 2008) | 3 lines
    
    Moved the creation of the fallback LoggingEventListener to FOUserAgent so event before the startDocument() SAX event arrive in the log.
    Dynamic discovery of event models. Renderers and extensions can register renderer-specific event models.
    Switched the most important parts of the renderers to events (maybe not everything is converted).
  ........
    r640397 | jeremias | 2008-03-24 13:43:04 +0100 (Mo, 24 Mrz 2008) | 1 line
    
    Remaining fixcrlfs. Xalan likes to mix CRLF and LF on Windows.
  ........
    r640398 | jeremias | 2008-03-24 13:43:54 +0100 (Mo, 24 Mrz 2008) | 1 line
    
    Ignore namespace declarations for property handling.
  ........
    r640463 | jeremias | 2008-03-24 17:59:52 +0100 (Mo, 24 Mrz 2008) | 2 lines
    
    Event in area package.
    Exposed getUserAgent() in Renderer interface (was already public in AbstractRenderer).
  ........
    r642972 | jeremias | 2008-03-31 14:18:39 +0200 (Mo, 31 Mrz 2008) | 1 line
    
    Code restructured a bit.
  ........
    r642975 | jeremias | 2008-03-31 14:24:07 +0200 (Mo, 31 Mrz 2008) | 2 lines
    
    Plugged fonts package into the event subsystem. Note: I did not follow the same pattern as for the rest as the font package is to be considered FOP-external, so I just added a manual adapter for the FontEventListener. This demonstrates how an external library can be integrated with the event system.
    Missing warning for unknown formatting objects added. Warning is not issued by the ElementMappingRegistry anymore but by FOTreeBuilder which has access to more context information.
  ........
    r642997 | jeremias | 2008-03-31 16:10:08 +0200 (Mo, 31 Mrz 2008) | 1 line
    
    Added an example to demonstrate how to write your own event listener and how to deal with the exceptions thrown in the process.
  ........
    r642998 | jeremias | 2008-03-31 16:13:40 +0200 (Mo, 31 Mrz 2008) | 1 line
    
    Removed unused method. Event formatting should not be part of the Event class. Use EventFormatter.format(Event) instead.
  ........
    r643066 | jeremias | 2008-03-31 19:18:54 +0200 (Mo, 31 Mrz 2008) | 1 line
    
    First part of the event subsystem documentation (DRAFT).
  ........
    r643784 | jeremias | 2008-04-02 10:05:33 +0200 (Mi, 02 Apr 2008) | 1 line
    
    More documentation.
  ........
    r643785 | jeremias | 2008-04-02 10:06:38 +0200 (Mi, 02 Apr 2008) | 1 line
    
    Some nits.
  ........
    r643787 | jeremias | 2008-04-02 10:24:41 +0200 (Mi, 02 Apr 2008) | 1 line
    
    Completed javadocs
  ........
    r643824 | jeremias | 2008-04-02 12:00:30 +0200 (Mi, 02 Apr 2008) | 1 line
    
    Javadocs.
  ........
    r645847 | vhennebert | 2008-04-08 12:54:16 +0200 (Di, 08 Apr 2008) | 2 lines
    
    Minor typo fixes
  ........
    r645848 | vhennebert | 2008-04-08 12:58:30 +0200 (Di, 08 Apr 2008) | 2 lines
    
    Another small typo fix
  ........
    r647678 | jeremias | 2008-04-14 09:20:26 +0200 (Mo, 14 Apr 2008) | 1 line
    
    Renamed *EventProducer.Factory.create() to *EventProducer.Provider.get() to better reflect what the method does (instances may be cached and reused).
  ........
................
  r647745 | jeremias | 2008-04-14 13:01:06 +0100 (Mon, 14 Apr 2008) | 1 line
  
  svnmerge didn't work for me in this case. Remove svn merge info.
................


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_AFPGOCAResources@647787 13f79535-47bb-0310-9956-ffa450edef68

7 files changed, 175 insertions, 71 deletions

diff --git a/src/java/org/apache/fop/area/AreaEventProducer.java b/src/java/org/apache/fop/area/AreaEventProducer.java
new file mode 100644
index 000000000..7747d2d79
--- /dev/null
+++ b/src/java/org/apache/fop/area/AreaEventProducer.java
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.area;
+
+import org.apache.fop.events.EventBroadcaster;
+import org.apache.fop.events.EventProducer;
+
+/**
+ * Event producer interface for events related to the area tree.
+ */
+public interface AreaEventProducer extends EventProducer {
+
+    /**
+     * Provider class for the event producer.
+     */
+    class Provider {
+        
+        /**
+         * Returns an event producer.
+         * @param broadcaster the event broadcaster to use
+         * @return the event producer
+         */
+        public static AreaEventProducer get(EventBroadcaster broadcaster) {
+            return (AreaEventProducer)broadcaster.getEventProducerFor(
+                    AreaEventProducer.class);
+        }
+    }
+
+    /**
+     * An unresolved ID reference was encountered.
+     * @param source the event source
+     * @param type the type of reference
+     * @param id the unresolved ID
+     * @event.severity WARN
+     */
+    void unresolvedIDReference(Object source, String type, String id);
+    
+    /**
+     * An unresolved ID reference was encountered on a page.
+     * @param source the event source
+     * @param page the page the ID reference was found on
+     * @param id the unresolved ID
+     * @event.severity WARN
+     */
+    void unresolvedIDReferenceOnPage(Object source, String page, String id);
+    
+    /**
+     * A page could not be loaded/deserialized from a file.
+     * @param source the event source
+     * @param page the page to be loaded
+     * @param e the original exception
+     * @event.severity ERROR
+     */
+    void pageLoadError(Object source, String page, Exception e);
+    
+    /**
+     * A page could not be saved/serialized to a file.
+     * @param source the event source
+     * @param page the page to be serialized
+     * @param e the original exception
+     * @event.severity ERROR
+     */
+    void pageSaveError(Object source, String page, Exception e);
+    
+    /**
+     * A page could not be rendered.
+     * @param source the event source
+     * @param page the page to be serialized
+     * @param e the original exception
+     * @event.severity ERROR
+     */
+    void pageRenderingError(Object source, String page, Exception e);
+    
+}
diff --git a/src/java/org/apache/fop/area/AreaTreeHandler.java b/src/java/org/apache/fop/area/AreaTreeHandler.java
index 7454f4667..d3ea41554 100644
--- a/src/java/org/apache/fop/area/AreaTreeHandler.java
+++ b/src/java/org/apache/fop/area/AreaTreeHandler.java
@@ -325,8 +325,9 @@ public class AreaTreeHandler extends FOEventHandler {
                 if (pageVPList != null) {
                     res.resolveIDRef(ids[count], pageVPList);
                 } else {
-                    log.warn(odi.getName() + ": Unresolved id reference \""
-                            + ids[count] + "\" found.");
+                    AreaEventProducer eventProducer = AreaEventProducer.Provider.get(
+                            getUserAgent().getEventBroadcaster());
+                    eventProducer.unresolvedIDReference(this, odi.getName(), ids[count]);
                     idTracker.addUnresolvedIDRef(ids[count], res);
                 }
             }
diff --git a/src/java/org/apache/fop/area/AreaTreeObject.java b/src/java/org/apache/fop/area/AreaTreeObject.java
index 94250deba..1c2269a01 100644
--- a/src/java/org/apache/fop/area/AreaTreeObject.java
+++ b/src/java/org/apache/fop/area/AreaTreeObject.java
@@ -23,7 +23,7 @@ import java.util.Collections;
 import java.util.Iterator;
 import java.util.Map;
 
-import org.apache.fop.util.QName;
+import org.apache.xmlgraphics.util.QName;
 
 /**
  * Abstract base class for all area tree objects.
@@ -53,12 +53,12 @@ public abstract class AreaTreeObject {
         if (atts.size() == 0) {
             return;
         }
-        Iterator iter = atts.keySet().iterator();
+        Iterator iter = atts.entrySet().iterator();
         while (iter.hasNext()) {
-            QName qName = (QName)iter.next();
-            String value = (String)atts.get(qName);
+            Map.Entry entry = (Map.Entry)iter.next();
+            String value = (String)entry.getValue();
             //The casting is only to ensure type safety (too bad we can't use generics, yet) 
-            setForeignAttribute(qName, value);
+            setForeignAttribute((QName)entry.getKey(), value);
         }
     }
     
diff --git a/src/java/org/apache/fop/area/AreaTreeParser.java b/src/java/org/apache/fop/area/AreaTreeParser.java
index fafb99ed6..19edd3d5e 100644
--- a/src/java/org/apache/fop/area/AreaTreeParser.java
+++ b/src/java/org/apache/fop/area/AreaTreeParser.java
@@ -50,6 +50,7 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.xmlgraphics.image.loader.ImageInfo;
 import org.apache.xmlgraphics.image.loader.ImageManager;
 import org.apache.xmlgraphics.image.loader.ImageSessionContext;
+import org.apache.xmlgraphics.util.QName;
 
 import org.apache.fop.apps.FOUserAgent;
 import org.apache.fop.area.Trait.Background;
@@ -78,7 +79,6 @@ import org.apache.fop.util.ColorUtil;
 import org.apache.fop.util.ContentHandlerFactory;
 import org.apache.fop.util.ContentHandlerFactoryRegistry;
 import org.apache.fop.util.DefaultErrorListener;
-import org.apache.fop.util.QName;
 
 /**
  * This is a parser for the area tree XML (intermediate format) which is used to reread an area
diff --git a/src/java/org/apache/fop/area/CachedRenderPagesModel.java b/src/java/org/apache/fop/area/CachedRenderPagesModel.java
index 363fa02d1..b34a7e8d1 100644
--- a/src/java/org/apache/fop/area/CachedRenderPagesModel.java
+++ b/src/java/org/apache/fop/area/CachedRenderPagesModel.java
@@ -19,24 +19,27 @@
  
 package org.apache.fop.area;
 
-import org.apache.commons.io.IOUtils;
-import org.apache.fop.apps.FOPException;
-import org.apache.fop.apps.FOUserAgent;
-import org.apache.fop.fonts.FontInfo;
-import org.xml.sax.SAXException;
-
-import java.util.Map;
-import java.util.HashMap;
-import java.util.Iterator;
-
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.FileInputStream;
-import java.io.ObjectOutputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
 import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.io.OutputStream;
-import java.io.BufferedOutputStream;
-import java.io.BufferedInputStream;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import org.xml.sax.SAXException;
+
+import org.apache.commons.io.IOUtils;
+
+import org.apache.fop.apps.FOPException;
+import org.apache.fop.apps.FOUserAgent;
+import org.apache.fop.events.ResourceEventProducer;
+import org.apache.fop.fonts.FontInfo;
 
 /**
  * A simple cached render pages model.
@@ -69,46 +72,39 @@ public class CachedRenderPagesModel extends RenderPagesModel {
      */
     protected boolean checkPreparedPages(PageViewport newpage, boolean renderUnresolved) {
         for (Iterator iter = prepared.iterator(); iter.hasNext();) {
-            PageViewport p = (PageViewport)iter.next();
-            if (p.isResolved() || renderUnresolved) {
-                if (p != newpage) {
+            PageViewport pageViewport = (PageViewport)iter.next();
+            if (pageViewport.isResolved() || renderUnresolved) {
+                if (pageViewport != newpage) {
                     try {
                         // load page from cache
-                        String name = (String)pageMap.get(p);
+                        String name = (String)pageMap.get(pageViewport);
                         File tempFile = new File(baseDir, name);
                         log.debug("Loading page from: " + tempFile);
                         ObjectInputStream in = new ObjectInputStream(
                                              new BufferedInputStream(
                                                new FileInputStream(tempFile)));
                         try {
-                            p.loadPage(in);
+                            pageViewport.loadPage(in);
                         } finally {
                             IOUtils.closeQuietly(in);
                         }
                         if (!tempFile.delete()) {
-                            log.warn("Temporary file could not be deleted: " + tempFile);
+                            ResourceEventProducer eventProducer
+                                = ResourceEventProducer.Provider.get(
+                                        renderer.getUserAgent().getEventBroadcaster());
+                            eventProducer.cannotDeleteTempFile(this, tempFile);
                         }
-                        pageMap.remove(p);
+                        pageMap.remove(pageViewport);
                     } catch (Exception e) {
-                        log.error(e);
+                        AreaEventProducer eventProducer
+                            = AreaEventProducer.Provider.get(
+                                renderer.getUserAgent().getEventBroadcaster());
+                        eventProducer.pageLoadError(this, pageViewport.getPageNumberString(), e);
                     }
                 }
 
-                try {
-                    renderer.renderPage(p);
-                    if (!p.isResolved()) {
-                        String[] idrefs = p.getIDRefs();
-                        for (int count = 0; count < idrefs.length; count++) {
-                            log.warn("Page " + p.getPageNumberString()
-                                + ": Unresolved id reference \"" + idrefs[count] 
-                                + "\" found.");
-                        }
-                    }
-                } catch (Exception e) {
-                    // use error handler to handle this FOP or IO Exception
-                    log.error(e);
-                }
-                p.clear();
+                renderPage(pageViewport);
+                pageViewport.clear();
                 iter.remove();
             } else {
                 if (!renderer.supportsOutOfOrder()) {
@@ -147,8 +143,11 @@ public class CachedRenderPagesModel extends RenderPagesModel {
             if (log.isDebugEnabled()) {
                 log.debug("Page saved to temporary file: " + tempFile);
             }
-        } catch (Exception e) {
-            log.error(e);
+        } catch (IOException ioe) {
+            AreaEventProducer eventProducer
+                = AreaEventProducer.Provider.get(
+                    renderer.getUserAgent().getEventBroadcaster());
+            eventProducer.pageSaveError(this, page.getPageNumberString(), ioe);
         }
     }
 
diff --git a/src/java/org/apache/fop/area/PageViewport.java b/src/java/org/apache/fop/area/PageViewport.java
index af557ade9..da7ef1def 100644
--- a/src/java/org/apache/fop/area/PageViewport.java
+++ b/src/java/org/apache/fop/area/PageViewport.java
@@ -21,14 +21,15 @@ package org.apache.fop.area;
 
 import java.awt.Rectangle;
 import java.awt.geom.Rectangle2D;
-import java.io.ObjectOutputStream;
+import java.io.IOException;
 import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.List;
-import java.util.Map;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 import org.apache.commons.logging.Log;
@@ -516,9 +517,9 @@ public class PageViewport extends AreaTreeObject implements Resolvable, Cloneabl
      * The map of unresolved references are set on the page so that
      * the resolvers can be properly serialized and reloaded.
      * @param out the object output stream to write the contents
-     * @throws Exception if there is a problem saving the page
+     * @throws IOException in case of an I/O error while serializing the page
      */
-    public void savePage(ObjectOutputStream out) throws Exception {
+    public void savePage(ObjectOutputStream out) throws IOException {
         // set the unresolved references so they are serialized
         page.setUnresolvedReferences(unresolvedIDRefs);
         out.writeObject(page);
@@ -531,9 +532,10 @@ public class PageViewport extends AreaTreeObject implements Resolvable, Cloneabl
      * if there are any unresolved references that were resolved
      * while saved they will be resolved on the page contents.
      * @param in the object input stream to read the page from
-     * @throws Exception if there is an error loading the page
+     * @throws ClassNotFoundException if a class was not found while loading the page
+     * @throws IOException if an I/O error occurred while loading the page
      */
-    public void loadPage(ObjectInputStream in) throws Exception {
+    public void loadPage(ObjectInputStream in) throws IOException, ClassNotFoundException {
         page = (Page) in.readObject();
         unresolvedIDRefs = page.getUnresolvedReferences();
         if (unresolvedIDRefs != null && pendingResolved != null) {
diff --git a/src/java/org/apache/fop/area/RenderPagesModel.java b/src/java/org/apache/fop/area/RenderPagesModel.java
index e080e9cbe..b21566902 100644
--- a/src/java/org/apache/fop/area/RenderPagesModel.java
+++ b/src/java/org/apache/fop/area/RenderPagesModel.java
@@ -156,23 +156,7 @@ public class RenderPagesModel extends AreaTreeModel {
                         && pageViewport.getPageSequence().isFirstPage(pageViewport)) {
                     renderer.startPageSequence(getCurrentPageSequence());
                 }
-                try {
-                    renderer.renderPage(pageViewport);
-                    if (!pageViewport.isResolved()) {
-                        String[] idrefs = pageViewport.getIDRefs();
-                        for (int count = 0; count < idrefs.length; count++) {
-                            log.warn("Page " + pageViewport.getPageNumberString()
-                                + ": Unresolved id reference \"" + idrefs[count] 
-                                + "\" found.");
-                        }
-                    }
-                } catch (Exception e) {
-                    // use error handler to handle this FOP or IO Exception
-                    log.error("Error while rendering page " + pageViewport.getPageIndex(), e);
-                    if (e instanceof RuntimeException) {
-                        throw (RuntimeException)e;
-                    }
-                }
+                renderPage(pageViewport);
                 pageViewport.clear();
                 iter.remove();
             } else {
@@ -186,6 +170,33 @@ public class RenderPagesModel extends AreaTreeModel {
     }
 
     /**
+     * Renders the given page and notified about unresolved IDs if any.
+     * @param pageViewport the page to be rendered.
+     */
+    protected void renderPage(PageViewport pageViewport) {
+        try {
+            renderer.renderPage(pageViewport);
+            if (!pageViewport.isResolved()) {
+                String[] idrefs = pageViewport.getIDRefs();
+                for (int count = 0; count < idrefs.length; count++) {
+                    AreaEventProducer eventProducer = AreaEventProducer.Provider.get(
+                            renderer.getUserAgent().getEventBroadcaster());
+                    eventProducer.unresolvedIDReferenceOnPage(this,
+                            pageViewport.getPageNumberString(), idrefs[count]);
+                }
+            }
+        } catch (Exception e) {
+            AreaEventProducer eventProducer = AreaEventProducer.Provider.get(
+                    renderer.getUserAgent().getEventBroadcaster());
+            eventProducer.pageRenderingError(this,
+                    pageViewport.getPageNumberString(), e);
+            if (e instanceof RuntimeException) {
+                throw (RuntimeException)e;
+            }
+        }
+    }
+
+    /**
      * Prepare a page.
      * An unresolved page can be prepared if the renderer supports
      * it and the page will be rendered later.