/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* 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
* Lesser General Public License for more details.
*/
package org.geotools.xml.impl.jxpath;
import org.apache.commons.jxpath.JXPathContext;
import org.apache.commons.jxpath.JXPathContextFactory;
import org.apache.commons.jxpath.JXPathIntrospector;
import java.util.Iterator;
import org.geotools.xml.Configuration;
import org.geotools.xml.Node;
import org.geotools.xml.impl.DocumentHandler;
import org.geotools.xml.impl.ElementHandler;
import org.geotools.xml.impl.ElementHandlerImpl;
import org.geotools.xml.impl.NodeImpl;
import org.geotools.xml.impl.StreamingParserHandler;
public class JXPathStreamingParserHandler extends StreamingParserHandler {
/** xpath to stream **/
String xpath;
public JXPathStreamingParserHandler(Configuration config, String xpath) {
super(config);
this.xpath = xpath;
}
protected boolean stream(ElementHandler handler) {
//create an xpath context from the root element
// TODO: cache the context, should work just the same
// JXPathIntrospector.registerDynamicClass(ElementHandlerImpl.class,
// ElementHandlerPropertyHandler.class);
JXPathIntrospector.registerDynamicClass(NodeImpl.class, NodePropertyHandler.class);
// ElementHandler rootHandler =
// ((DocumentHandler) handlers.firstElement()).getDocumentElementHandler();
Node root = ((DocumentHandler) handlers.firstElement()).getParseNode();
JXPathContext jxpContext = JXPathContextFactory.newInstance().newContext(null, root);
jxpContext.setLenient(true);
Iterator itr = jxpContext.iterate(xpath);
for (; itr.hasNext();) {
Object obj = itr.next();
if (handler.getParseNode().equals(obj)) {
return true;
}
}
return false;
}
}