Java XPath Evaluate evaluateXPath(Node node, String xPath)

Description

evaluate X Path

License

Open Source License

Declaration

private static String evaluateXPath(Node node, String xPath) 

Method Source Code

//package com.java2s;
/*//from   w ww  .  j  a va 2  s . c om
 * Copyright 2010 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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;

public class Main {
    private static String evaluateXPath(Node node, String xPath) {
        int currentSearchIndex = 0;
        while (currentSearchIndex < xPath.length()) {

            int endingIndex = xPath.indexOf("/", currentSearchIndex);

            String noderNameFromXPath = null;
            if (endingIndex == -1) {
                noderNameFromXPath = xPath.substring(currentSearchIndex);
            } else {
                noderNameFromXPath = xPath.substring(currentSearchIndex,
                        endingIndex);
            }

            node = findChildNodeWithName(node, noderNameFromXPath);

            if (endingIndex == -1) {
                break;
            }

            currentSearchIndex = endingIndex + 1;
        }

        if (node != null && node.getFirstChild() != null) {
            return node.getFirstChild().getNodeValue();
        } else if (node != null) {
            return node.getNodeValue();
        } else {
            return null;
        }
    }

    private static Node findChildNodeWithName(Node node, String childName) {
        if (node == null) {
            return null;
        } else {
            if (node.getNodeName().equals(childName)) {
                return node;
            } else {
                NodeList nodeList = node.getChildNodes();
                for (int i = 0; i < nodeList.getLength(); i++) {
                    if (nodeList.item(i).getNodeName().equals(childName)) {
                        return nodeList.item(i);
                    }
                }

                return null;
            }
        }
    }
}

Related

1. evaluateXpath(Document doc, String xpath, QName returnType)
2. evaluateXPath(Element element, String xpathstring)
3. evaluateXpath(Element from, String xpath)
4. evaluateXPath(final String xPath, final Object item, final QName returnType)
5. evaluateXPath(final XPathExpression expr, final Object rootNode, final QName returnType)
6. evaluateXpath(String expression, Document document, QName dataType)
7. evaluateXpath(String expression, Object node, QName returnType, NamespaceContext nsContext)
8. evaluateXPath(String path, Node e, QName type)
9. evaluateXPath(String xpath, Object item, QName returnType)