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XML Pull parser library developed by Extreme Computing Lab, Indian University
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/*
 * $Header: /l/extreme/cvs/codes/xpp5/xis5/infoset_xpath_jaxen/org/xmlpull/infoset/xpath/jaxen/SimpleNamespaceContext.java,v 1.1 2005/05/16 23:59:18 aslom Exp $
 * $Revision: 1.1 $
 * $Date: 2005/05/16 23:59:18 $
 *
 * ====================================================================
 *
 * 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 2005/05/16 23:59:18 aslom Exp $
 */


package org.xmlpull.infoset.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;
    }
}