Java XML Node Parent getFirstElement(Node node, String namespace, String name)

Description

Get the first element matched with the given namespace and name.

License

Apache License

Parameter

Parameter	Description
node	The node.
namespac	The namespace.
name	The name.

Return

The wanted first element.

Declaration

public static Element getFirstElement(Node node, String namespace, String name) 

Method Source Code

//package com.java2s;
/*//from  w  w w .j a  v  a  2s  . co  m
 * $Header$
 * $Revision: 207706 $
 * $Date: 2004-08-30 16:08:10 +0800 (Mon, 30 Aug 2004) $
 *
 * ====================================================================
 *
 * Copyright 1999-2002 The Apache Software Foundation 
 *
 * 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.Element;

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

public class Main {
    /**
     * Get the first element matched with the given namespace and name.
     *
     * @param node The node.
     * @param namespac The namespace.
     * @param name The name.
     * @return The wanted first element.
     */
    public static Element getFirstElement(Node node, String namespace, String name) {
        NodeList children = node.getChildNodes();
        if (children == null)
            return null;
        for (int i = 0; i < children.getLength(); i++) {
            try {
                Element child = (Element) children.item(i);
                if (name.equals(getElementLocalName(child)) && namespace.equals(getElementNamespaceURI(child))) {
                    return child;
                }
            } catch (ClassCastException e) {
            }
        }
        return null;
    }

    public static String getElementLocalName(Element element) {
        String localName = null;

        if (element == null) {
            throw new IllegalArgumentException("The element cannot be null");
        } else {
            try {
                localName = element.getLocalName();
            } catch (NoSuchMethodError e) {
                localName = element.getTagName();
                int index = localName.indexOf(":");
                if (index > 0 && index < (localName.length() - 1)) {
                    localName = localName.substring(index + 1);
                }
            }
        }
        return localName;
    }

    public static String getElementNamespaceURI(Element element) {
        String namespace = null;

        if (element == null) {
            throw new IllegalArgumentException("The element cannot be null");
        } else {
            try {
                namespace = element.getNamespaceURI();
            } catch (NoSuchMethodError e) {
                String tagName = element.getTagName();
                String attribute = "xmlns";
                int index = tagName.indexOf(":");
                if (index > 0 && index < (tagName.length() - 1)) {
                    attribute += (":" + tagName.substring(0, index));
                }

                boolean found = false;
                for (Node node = element; !found && node != null; node = node.getParentNode()) {
                    try {
                        String tmp = ((Element) node).getAttribute(attribute);
                        if (tmp != null && !tmp.equals("")) {
                            namespace = tmp;
                            found = true;
                        }
                    } catch (ClassCastException f) {
                        // this will happen for Documents
                    }
                }
            }
        }

        return namespace;
    }
}

Related

1. getFirstElement(Node element)
2. getFirstElement(Node xml)
3. getFirstElementByTagName(Node node, String tagName)
4. getFirstElementByTagName(Node node, String tagName)
5. getFirstElementWithTagName(Node node, String element)