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MXP1 is a stable XmlPull parsing engine that is based on ideas from XPP and in particular XPP2 but completely revised and rewritten to take the best advantage of latest JIT JVMs such as Hotspot in JDK 1.4+.
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/*
 * $Header: /l/extreme/cvs/codes/XPP3/java/src/java/xpath/org/xmlpull/v1/builder/xpath/jaxen/SimpleNamespaceContext.java,v 1.1 2004/06/16 15:55:34 aslom Exp $
 * $Revision: 1.1 $
 * $Date: 2004/06/16 15:55:34 $
 *
 * ====================================================================
 *
 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions, and the disclaimer that follows 
 *    these conditions in the documentation and/or other materials 
 *    provided with the distribution.
 *
 * 3. The name "Jaxen" must not be used to endorse or promote products
 *    derived from this software without prior written permission.  For
 *    written permission, please contact [email protected].
 * 
 * 4. Products derived from this software may not be called "Jaxen", nor
 *    may "Jaxen" appear in their name, without prior written permission
 *    from the Jaxen Project Management ([email protected]).
 * 
 * In addition, we request (but do not require) that you include in the 
 * end-user documentation provided with the redistribution and/or in the 
 * software itself an acknowledgement equivalent to the following:
 *     "This product includes software developed by the
 *      Jaxen Project (http://www.jaxen.org/)."
 * Alternatively, the acknowledgment may be graphical using the logos 
 * available at http://www.jaxen.org/
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id: SimpleNamespaceContext.java,v 1.1 2004/06/16 15:55:34 aslom Exp $
 */


package org.xmlpull.v1.builder.xpath.jaxen;

import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;
import java.util.HashMap;

/**
 *  Provides mappings from namespace prefix to namespace URI to the xpath
 *  engine.
 */
public class SimpleNamespaceContext implements NamespaceContext, Serializable
{
    private Map namespaces;

    public SimpleNamespaceContext()
    {
        this.namespaces = new HashMap();
    }

    public SimpleNamespaceContext(Map namespaces)
    {
        this.namespaces = namespaces;
    }

    /**
     *  Adds all the namespace declarations that are in scope on the given
     *  element. In the case of an XSLT stylesheet, this would be the element
     *  that has the xpath expression in one of its attributes; i.e.
     *  <xsl:if test="condition/xpath/expression">.
     *
     *  @param nav  the navigator for use in conjunction with
     *              element
     *  @param element  the element to copy the namespaces from
     */
    public void addElementNamespaces( Navigator nav, Object element )
        throws UnsupportedAxisException
    {
        Iterator namespaceAxis = nav.getNamespaceAxisIterator( element );

        while ( namespaceAxis.hasNext() ) {
            Object namespace = namespaceAxis.next();
            String prefix = nav.getNamespacePrefix( namespace );
            String uri = nav.getNamespaceStringValue( namespace );
            if ( translateNamespacePrefixToUri(prefix) == null ) {
                addNamespace( prefix, uri );
            }
        }
    }    

    public void addNamespace(String prefix, String namespaceUri)
    {
        this.namespaces.put( prefix,
                             namespaceUri );
    }

    public String translateNamespacePrefixToUri(String prefix)
    {
        if ( this.namespaces.containsKey( prefix ) )
        {
            return (String) this.namespaces.get( prefix );
        }

        return null;
    }
}