http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * 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: FOPEventListenerProxy.java 679326 2008-07-24 09:35:34Z vhennebert $ */

package org.apache.fop.events;

import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.events.model.EventSeverity;
import org.apache.fop.fo.FOValidationEventProducer;
import org.apache.fop.layoutmgr.BlockLevelEventProducer;


EventListener proxy that inspects all events and adjusts severity levels where necessary.
For validation events, it reacts on each event based on the strict validation setting in
the user agent.
For layout events, it reduces the default severity level if FOP signals that it can recover
from the event.

/**
 * EventListener proxy that inspects all events and adjusts severity levels where necessary.
 * For validation events, it reacts on each event based on the strict validation setting in
 * the user agent.
 * For layout events, it reduces the default severity level if FOP signals that it can recover
 * from the event.
 */
public class FOPEventListenerProxy implements EventListener {

    private static final String FOVALIDATION_EVENT_ID_PREFIX
                = FOValidationEventProducer.class.getName();

    private static final String BLOCK_LEVEL_EVENT_ID_PREFIX
                = BlockLevelEventProducer.class.getName();

    private EventListener delegate;
    private FOUserAgent userAgent;

    
Main constructor.

Params:
  • delegate – the event listener to delegate events to
  • userAgent – the FO user agent
/**
     * Main constructor.
     * @param delegate the event listener to delegate events to
     * @param userAgent the FO user agent
     */
    public FOPEventListenerProxy(EventListener delegate, FOUserAgent userAgent) {
        this.delegate = delegate;
        this.userAgent = userAgent;
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public synchronized void processEvent(Event event) {
        if (event.getEventID().startsWith(FOVALIDATION_EVENT_ID_PREFIX)) {
            Boolean canRecover = (Boolean)event.getParam("canRecover");
            if (Boolean.TRUE.equals(canRecover) && !userAgent.validateStrictly()) {
                //Reduce severity if FOP can recover
                event.setSeverity(EventSeverity.WARN);
            }
        } else if (event.getEventID().startsWith(BLOCK_LEVEL_EVENT_ID_PREFIX)) {
            Boolean canRecover = (Boolean)event.getParam("canRecover");
            if (Boolean.TRUE.equals(canRecover)) {
                //Reduce severity if FOP can recover
                event.setSeverity(EventSeverity.WARN);
            }
        }
        this.delegate.processEvent(event);
    }

}