src/whiteboard/org/apache/xerces/tree/NamespacedNode.java

/*
 * $Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights 
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *    distribution.
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 *       "This product includes software developed by the
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 *    if and wherever such third-party acknowledgments normally appear.
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Sun Microsystems, Inc., 
 * http://www.sun.com.  For more information on the Apache Software 
 * Foundation, please see <http://www.apache.org/>.
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package org.apache.xerces.tree;

import org.w3c.dom.*;
import org.apache.xerces.tree.XmlNames;

/**
 * This adds the notion of namespaces to the ParentNode class for certain
 * types of nodes such as DOM Element and Attr nodes.
 *
 * @author Edwin Goei
 * @version $Revision$
 */
abstract class NamespacedNode extends ParentNode {
    // Here "name" corresponds to "QName" in the XML Namespaces REC
    protected String name;
    protected String namespaceURI;

    /**
     * The namespace URI of this node, or <code>null</code> if it is
     * unspecified.  This is not a computed value.
     *
     * @since DOM Level 2
     */
    public String getNamespaceURI() {
        return namespaceURI;
    }

    /**
     * The namespace prefix of this node, or <code>null</code> if it is
     * unspecified.
     *
     * @since DOM Level 2
     */
    public String getPrefix() {
        return XmlNames.getPrefix(name);
    }

    /**
     * Sets the namespace prefix of this node.
     *
     * @since DOM Level 2
     */
    public void setPrefix(String prefix) throws DOMException {
        if (readonly) {
            throw new DomEx(DomEx.NO_MODIFICATION_ALLOWED_ERR);
        }

	int index = name.indexOf(':');

        // prefix == null implies reset to no default namespace
	if (prefix == null) {
	    if (index >= 0) {
	    	name = name.substring(index + 1);
            }
	    return;
	}

        // Replace or add new prefix
   	StringBuffer tmp = new StringBuffer(prefix);
	tmp.append(':');
	if (index < 0 ) {
	    tmp.append(name);
	} else {
	    tmp.append(name.substring(index + 1));
        }
	name = tmp.toString();
    }

    /**
     * Returns the local part of the qualified name of this node.
     *
     * @since DOM Level 2
     */
    public String getLocalName() {
        return XmlNames.getLocalPart(name);
    }
}