resolve the XML namespace - Java XML

Java examples for XML:Namespace

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Description

resolve the XML namespace

Demo Code

/*******************************************************************************
 * Copyright (c) 2006, 2010 Soyatec (http://www.soyatec.com) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://from   w ww .j  a  v a2  s.  c om
 *     Soyatec - initial API and implementation
 *******************************************************************************/
//package com.java2s;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

public class Main {
    public static String XMLNS = "xmlns";

    /**
     * resolve the namespace
     * 
     * @param node
     * @return
     */
    public static String lookupNamespaceURI(Node node) {
        String string = node.getNamespaceURI();
        if (string != null) {
            return string;
        }
        return lookupNamespaceURI(node, node.getPrefix());
    }

    public static String lookupNamespaceURI(Node node, Node attr) {
        String string = attr.getNamespaceURI();
        if (string != null) {
            return string;
        }
        return lookupNamespaceURI(node, attr.getPrefix());
    }

    public static String lookupNamespaceURI(Node node, String prefix) {
        NamedNodeMap map = node.getAttributes();
        if (map != null && map.getLength() > 0) {
            for (int i = 0; i < map.getLength(); i++) {
                Node attr = map.item(i);
                String name = attr.getNodeName();
                if (name.startsWith(XMLNS)) {
                    int index = name.indexOf(':');
                    if (index == -1 || prefix == null) {
                        if (index == -1 && prefix == null) {
                            return attr.getNodeValue();
                        }
                        continue;
                    }
                    String prefixName = name.substring(index + 1);
                    if (prefix.equals(prefixName)) {
                        return attr.getNodeValue();
                    }
                }
            }
        }

        Node nodeParent = node.getParentNode();
        if (nodeParent != null) {
            return lookupNamespaceURI(nodeParent, prefix);
        }
        return null;
    }
}

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