/*
* eXist Open Source Native XML Database
* Copyright (C) 2000-04, Wolfgang M. Meier (wolfgang@exist-db.org)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id$
*/
package org.exist.util;
import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.impl.StackObjectPool;
import org.apache.log4j.Logger;
import org.exist.Namespaces;
import org.exist.storage.BrokerPool;
import org.exist.validation.GrammarPool;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.DefaultHandler2;
/**
* Maintains a pool of XMLReader objects. The pool is available through
* {@link BrokerPool#getParserPool()}.
*
* @author wolf
*/
public class XMLReaderPool extends StackObjectPool<XMLReader> {
private final static Logger LOG = Logger.getLogger(XMLReaderPool.class);
private final static DefaultHandler2 DUMMY_HANDLER = new DefaultHandler2();
private final Configuration config;
/**
*
*
* @param factory
* @param maxIdle
* @param initIdleCapacity
*/
public XMLReaderPool(Configuration config, PoolableObjectFactory<XMLReader> factory, int maxIdle, int initIdleCapacity) {
super(factory, maxIdle, initIdleCapacity);
this.config = config;
}
public synchronized XMLReader borrowXMLReader() {
try {
return super.borrowObject();
} catch (final Exception e) {
throw new IllegalStateException("error while returning XMLReader: " + e.getMessage(), e );
}
}
@Override
public synchronized XMLReader borrowObject() throws Exception {
return borrowXMLReader();
}
public synchronized void returnXMLReader(XMLReader reader) {
if (reader == null) {
return;
}
try {
reader.setContentHandler(DUMMY_HANDLER);
reader.setErrorHandler(DUMMY_HANDLER);
reader.setProperty(Namespaces.SAX_LEXICAL_HANDLER, DUMMY_HANDLER);
// DIZZZ; workaround Xerces bug. Cached DTDs cause for problems during validation parsing.
final GrammarPool grammarPool =
(GrammarPool) getReaderProperty(reader,
XMLReaderObjectFactory.APACHE_PROPERTIES_INTERNAL_GRAMMARPOOL);
if(grammarPool!=null){
grammarPool.clearDTDs();
}
super.returnObject(reader);
} catch (final Exception e) {
throw new IllegalStateException("error while returning XMLReader: " + e.getMessage(), e);
}
}
@Override
public synchronized void returnObject(XMLReader obj) throws Exception {
returnXMLReader(obj);
}
private Object getReaderProperty(XMLReader xmlReader, String propertyName){
Object object = null;
try {
object=xmlReader.getProperty(propertyName);
} catch (final SAXNotRecognizedException ex) {
LOG.error("SAXNotRecognizedException: " + ex.getMessage());
} catch (final SAXNotSupportedException ex) {
LOG.error("SAXNotSupportedException:" + ex.getMessage());
}
return object;
}
}