Java XPath Get getValues(final String expression, final String xml)

Description

Evaluates the XPath expression against the xml and returns the selected values.

License

Open Source License

Parameter

Parameter	Description
expression	Expression to evaluate.
xml	The xml to query.

Exception

Parameter	Description
XPathExpressionException	If an error occurs evaluating the expression.

Return

The selected values.

Declaration

public static List<String> getValues(final String expression, final String xml)
        throws XPathExpressionException 

Method Source Code

//package com.java2s;
/**/*from   w  w  w . ja  v a2 s  . c  o  m*/
 * Abiquo community edition
 * cloud management application for hybrid clouds
 * Copyright (C) 2008-2010 - Abiquo Holdings S.L.
 *
 * This application 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 under
 * version 3 of the License
 *
 * This software 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 v.3 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class Main {
    /**
     * Evaluates the XPath expression against the <code>xml</code> and returns the selected values.
     * 
     * @param expression Expression to evaluate.
     * @param xml The xml to query.
     * @return The selected values.
     * @throws XPathExpressionException If an error occurs evaluating the expression.
     */
    public static List<String> getValues(final String expression, final String xml)
            throws XPathExpressionException {
        final NodeList xpathResults = getNodes(expression, xml);
        final List<String> results = new ArrayList<String>(xpathResults.getLength());

        for (int i = 0; i < xpathResults.getLength(); i++) {
            results.add(xpathResults.item(i).getNodeValue());
        }

        return results;
    }

    /**
     * Evaluates the XPath expression against the <code>xml</code> and returns the selected nodes.
     * 
     * @param expression Expression to evaluate.
     * @param xml The xml to query.
     * @return The selected nodes.
     * @throws XPathExpressionException If an error occurs evaluating the expression.
     */
    public static NodeList getNodes(final String expression, final String xml) throws XPathExpressionException {
        final InputSource source = new InputSource(new StringReader(xml));
        final XPathFactory factory = XPathFactory.newInstance();
        final XPath xpath = factory.newXPath();
        return (NodeList) xpath.evaluate(expression, source, XPathConstants.NODESET);
    }
}

Related

1. getValidXpath(String xPath, NamespaceContext context)
2. getValue(final String expression, final String xml)
3. getValueByPath(Node node, String path)
4. getValueByXpath(Node doc, String xquery)
5. getValueFromXML(final String inputXML, final String xPathQuery, final int index)
6. getX_PATH()
7. xGetNode(Node targetNode, String expression)