Java XML QName findElementRecursive(Element element, QName elementQName)

Description

find Element Recursive

License

Apache License

Declaration

public static Element findElementRecursive(Element element, QName elementQName) 

Method Source Code

//package com.java2s;
/*/*from   w  w w .  j  ava 2s .  c o  m*/
 * Copyright (c) 2010-2013 Evolveum
 *
 * 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 java.util.ArrayList;

import java.util.List;

import javax.xml.namespace.QName;

import org.w3c.dom.Element;

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

public class Main {
    public static Element findElementRecursive(Element element, QName elementQName) {
        if (elementQName.equals(getQName(element))) {
            return element;
        }
        for (Element subElement : listChildElements(element)) {
            Element foundElement = findElementRecursive(subElement, elementQName);
            if (foundElement != null) {
                return foundElement;
            }
        }
        return null;
    }

    public static QName getQName(Node node) {
        if (node.getLocalName() == null) {
            if (node.getNodeName() == null) {
                return null;
            } else {
                return new QName(null, node.getNodeName());
            }
        }
        if (node.getPrefix() == null) {
            return new QName(node.getNamespaceURI(), node.getLocalName());
        }
        return new QName(node.getNamespaceURI(), node.getLocalName(), node.getPrefix());
    }

    public static List<Element> listChildElements(Node node) {
        List<Element> subelements = new ArrayList<Element>();
        NodeList childNodes = node.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            Node childNode = childNodes.item(i);
            if (childNode.getNodeType() == Node.ELEMENT_NODE) {
                subelements.add((Element) childNode);
            }
        }
        return subelements;
    }
}

Related

1. createCollection(QName... qnames)
2. createRootElement(T value, QName q_name, Class elementClass)
3. extract(final List