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/*
* Copyright 2005 The Apache Software Foundation.
*
* Licensed 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.logging;
import java.util.List;
import java.util.ListIterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.layoutmgr.KnuthElement;
import org.apache.fop.layoutmgr.ElementListObserver.Observer;
/**
* <p>Logs all observed element lists.
* </p>
* <p>You can enable/disabled individual categories separately, for example for JDK 1.4 logging:
* </p>
* <p>org.apache.fop.logging.LoggingElementListObserver.level = INFO</p>
* <p>org.apache.fop.logging.LoggingElementListObserver.table-cell.level = FINE</p>
*/
public class LoggingElementListObserver implements Observer {
/** @see org.apache.fop.layoutmgr.ElementListObserver.Observer */
public void observe(List elementList, String category, String id) {
Log log = LogFactory.getLog(LoggingElementListObserver.class.getName() + "." + category);
if (!log.isDebugEnabled()) {
return;
}
log.debug(" ");
log.debug("ElementList: category=" + category + ", id=" + id);
if (elementList == null) {
log.debug("<<empty list>>");
return;
}
ListIterator tempIter = elementList.listIterator();
KnuthElement temp;
while (tempIter.hasNext()) {
temp = (KnuthElement) tempIter.next();
if (temp.isBox()) {
log.debug(tempIter.previousIndex()
+ ") " + temp);
} else if (temp.isGlue()) {
log.debug(tempIter.previousIndex()
+ ") " + temp);
} else {
log.debug(tempIter.previousIndex()
+ ") " + temp);
}
if (temp.getPosition() != null) {
log.debug(" " + temp.getPosition());
}
}
log.debug(" ");
}
}
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