org.apache.fop.events.FOPEventListenerProxy Maven / Gradle / Ivy
/*
* 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.
*/
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.
* @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} */
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);
}
}