Java XPath Get getNodeList(Node xmlNode, String xpathString)

Description

Return the Element corresponding the the XPath

License

Open Source License

Parameter

Parameter	Description
xmlNode	a parameter
xpathString	a parameter

Exception

Parameter	Description
XPathExpressionException	an exception

Declaration

public static NodeList getNodeList(Node xmlNode, String xpathString) 

Method Source Code

//package com.java2s;
/*//from   w w  w  .  jav  a  2 s  .  com
 * DSS - Digital Signature Services
 *
 * Copyright (C) 2011 European Commission, Directorate-General Internal Market and Services (DG MARKT), B-1049 Bruxelles/Brussel
 *
 * Developed by: 2011 ARHS Developments S.A. (rue Nicolas Bov? 2B, L-1253 Luxembourg) http://www.arhs-developments.com
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * "DSS - Digital Signature Services" 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 2.1 of the
 * License, or (at your option) any later version.
 *
 * DSS 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
 * "DSS - Digital Signature Services".  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Iterator;
import javax.xml.crypto.dsig.XMLSignature;

import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main {
    /**
     * Return the Element corresponding the the XPath
     * 
     * @param xmlNode
     * @param xpathString
     * @return
     * @throws XPathExpressionException
     */
    public static NodeList getNodeList(Node xmlNode, String xpathString) {
        try {
            XPathExpression expr = createXPathExpression(xpathString);
            return (NodeList) expr.evaluate(xmlNode, XPathConstants.NODESET);
        } catch (XPathExpressionException e) {
            throw new RuntimeException(e);
        }
    }

    private static XPathExpression createXPathExpression(String xpathString) {
        /* XPath */
        XPathFactory factory = XPathFactory.newInstance();
        XPath xpath = factory.newXPath();
        xpath.setNamespaceContext(new NamespaceContext() {

            @Override
            public Iterator<?> getPrefixes(String namespaceURI) {
                throw new RuntimeException();
            }

            @Override
            public String getPrefix(String namespaceURI) {
                throw new RuntimeException();
            }

            @Override
            public String getNamespaceURI(String prefix) {
                if ("ds".equals(prefix)) {
                    return XMLSignature.XMLNS;
                } else if ("xades".equals(prefix)) {
                    return "http://uri.etsi.org/01903/v1.3.2#";
                } else if ("xades141".equals(prefix)) {
                    return "http://uri.etsi.org/01903/v1.4.1#";
                } else if ("xades111".equals(prefix)) {
                    return "http://uri.etsi.org/01903/v1.1.1#";
                }
                throw new RuntimeException("Prefix not recognized : " + prefix);
            }
        });
        try {
            XPathExpression expr = xpath.compile(xpathString);
            return expr;
        } catch (XPathExpressionException ex) {
            throw new RuntimeException(ex);
        }

    }
}

Related

1. getNodeList(File xml, String xpathExpression)
2. getNodeList(final String expr, final File xmlFile)
3. getNodeList(InputStream stream, String pattern)
4. getNodeList(Node node, String path)
5. getNodeList(Node node, String xpath)
6. getNodeList(Reader reader, String expression)
7. getNodeListAsArray(Node doc, String xpath)
8. getNodeListAttValAsStringCol(final String xPath, final Node node, final String attrName)
9. getNodes(Node node, String expStr)