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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/SimpleVariableContext.java,v 1.19 2006/06/03 20:19:54 elharo Exp $
 * $Revision: 1.19 $
 * $Date: 2006/06/03 20:19:54 $
 *
 * ====================================================================
 *
 * Copyright 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:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS 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 COPYRIGHT OWNER
 * OR 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: SimpleVariableContext.java,v 1.19 2006/06/03 20:19:54 elharo Exp $
 */


package org.navimatrix.jaxen;

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

/** Simple default implementation for VariableContext.
 *
 *  

* This is a simple table-based key-lookup implementation * for VariableContext which can be programmatically * extended by setting additional variables. *

* * @author bob mcwhirter */ public class SimpleVariableContext implements VariableContext, Serializable { /** * */ private static final long serialVersionUID = 961322093794516518L; /** Table of variable bindings. */ private Map variables; /** Construct. * *

* Create a new empty variable context. *

*/ public SimpleVariableContext() { variables = new HashMap(); } /** Set the value associated with a variable. * *

* This method sets a variable that is * associated with a particular namespace. * These variables appear such as $prefix:foo * in an XPath expression. Prefix to URI resolution * is the responsibility of a NamespaceContext. * Variables within a VariableContext are * referred to purely based upon their namespace URI, * if any. *

* * @param namespaceURI the namespace URI of the variable * @param localName the local name of the variable * @param value The value to be bound to the variable */ public void setVariableValue( String namespaceURI, String localName, Object value ) { this.variables.put( new QualifiedName(namespaceURI, localName), value ); } /** Set the value associated with a variable. * *

* This method sets a variable that is not * associated with any particular namespace. * These variables look like $foo * in an XPath expression. *

* * @param localName the local name of the variable * @param value the value to be bound to the variable */ public void setVariableValue( String localName, Object value ) { this.variables.put( new QualifiedName(null, localName), value ); } public Object getVariableValue( String namespaceURI, String prefix, String localName ) throws UnresolvableException { QualifiedName key = new QualifiedName( namespaceURI, localName ); if ( this.variables.containsKey(key) ) { return this.variables.get( key ); } else { throw new UnresolvableException( "Variable " + key.getClarkForm() ); } } }




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