Java XPath Find findAll(Node node, String xpath)

Description

Returns a NodeList composed of all the nodes that match an XPath expression, which must be valid.

License

Apache License

Declaration

public static List<Node> findAll(Node node, String xpath) 

Method Source Code

//package com.java2s;
/*//from  ww w.java2s  .  com
 * Copyright 2008-2010 Digital Enterprise Research Institute (DERI)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *          http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.util.ArrayList;
import java.util.List;

public class Main {
    private final static XPath xPathEngine = XPathFactory.newInstance().newXPath();

    /**
     * Returns a NodeList composed of all the nodes that match an XPath
     * expression, which must be valid.
     */
    public static List<Node> findAll(Node node, String xpath) {
        if (node == null) {
            throw new NullPointerException("node cannot be null.");
        }
        try {
            NodeList nodes = (NodeList) xPathEngine.evaluate(xpath, node, XPathConstants.NODESET);
            List<Node> result = new ArrayList<Node>(nodes.getLength());
            for (int i = 0; i < nodes.getLength(); i++) {
                result.add(nodes.item(i));
            }
            return result;
        } catch (XPathExpressionException ex) {
            throw new IllegalArgumentException("Illegal XPath expression: " + xpath, ex);
        }
    }
}

Related

1. findAll(Node root, String xPath)
2. findNode(String xPathExpression, Element root)
3. findNodeByXPath(Node base, String xpath)
4. findNodeByXpath(String xpathExpression, String fileName)