Java XPath Find findNodeByXPath(Node base, String xpath)

Description

find Node By X Path

License

Apache License

Declaration

public static Node findNodeByXPath(Node base, String xpath) 

Method Source Code

//package com.java2s;
/*/*from w ww .  java 2s .  co  m*/
 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * 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.
 *
 * Contributors:
 *     Max Stepanov
 *
 * $Id$
 */

import java.util.StringTokenizer;

import org.w3c.dom.Node;

public class Main {
    public static Node findNodeByXPath(Node base, String xpath) {
        if ("/".equals(xpath)) {
            return base;
        }
        Node node = base;
        StringTokenizer tok = new StringTokenizer(xpath, "/");
        while (tok.hasMoreTokens()) {
            String subpath = tok.nextToken();
            String localName;
            int nodePos = 0;
            int index = subpath.indexOf('[');
            if (index > 0) {
                localName = subpath.substring(0, index).toLowerCase();
                nodePos = Integer.parseInt(subpath.substring(index + 1, subpath.indexOf(']')));
            } else {
                localName = subpath.toLowerCase();
            }
            short nodeType = Node.ELEMENT_NODE;
            if ("text()".equals(localName)) {
                nodeType = Node.TEXT_NODE;
                localName = "";
            }
            node = node.getFirstChild();
            int pos = 0;
            while (node != null) {
                if (node.getNodeType() == nodeType && localName.equals(node.getLocalName().toLowerCase())) {
                    if (pos == nodePos) {
                        break;
                    }
                    ++pos;
                }
                node = node.getNextSibling();
            }
        }
        return node;
        /*
         * try { XPathFactory factory = XPathFactory.newInstance(); XPath xpath = factory.newXPath(); XPathExpression
         * expr = xpath.compile(path); return (Node) expr.evaluate(document, XPathConstants.NODE); } catch
         * (XPathExpressionException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (DOMException
         * e) { // TODO Auto-generated catch block e.printStackTrace(); }
         */

    }
}

Related

1. findAll(Node node, String xpath)
2. findAll(Node root, String xPath)
3. findNode(String xPathExpression, Element root)
4. findNodeByXpath(String xpathExpression, String fileName)
5. findNodeByXPath(String xPathString, Object source)
6. findNodes(final Node node, final String expression)
7. findNodesByXPath(Node contextNode, String expression)