/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.jasperreports.engine.util.xml;
import javax.xml.transform.TransformerException;
import net.sf.jasperreports.engine.JRException;
import org.apache.xpath.CachedXPathAPI;
import org.apache.xpath.objects.XObject;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* XPath executer implementation that uses <a href="http://xml.apache.org/xalan-j/" target="_blank">Apache Xalan</a>.
*
* @author Lucian Chirita (lucianc@users.sourceforge.net)
* @version $Id: XalanXPathExecuter.java 3034 2009-08-27 11:58:04Z teodord $
*/
public class XalanXPathExecuter implements JRXPathExecuter {
// XPath API facade
private CachedXPathAPI xpathAPI = new CachedXPathAPI();
/**
* Default constructor.
*/
public XalanXPathExecuter() {
}
public NodeList selectNodeList(Node contextNode, String expression) throws JRException
{
try {
return xpathAPI.selectNodeList(contextNode, expression);
} catch (TransformerException e) {
throw new JRException("XPath selection failed. Expression: "
+ expression, e);
}
}
public Object selectObject(Node contextNode, String expression) throws JRException {
try {
Object value;
XObject object = xpathAPI.eval(contextNode, expression);
switch (object.getType()) {
case XObject.CLASS_NODESET:
value = object.nodeset().nextNode();
break;
case XObject.CLASS_BOOLEAN:
value = object.bool() ? Boolean.TRUE : Boolean.FALSE;
break;
case XObject.CLASS_NUMBER:
value = new Double(object.num());
break;
default:
value = object.str();
break;
}
return value;
} catch (TransformerException e) {
throw new JRException("XPath selection failed. Expression: "
+ expression, e);
}
}
}