/*
* $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/SimpleVariableContext.java,v 1.19 2006/05/03 16:07:03 elharo Exp $
* $Revision: 1.19 $
* $Date: 2006/05/03 16:07:03 $
*
* ====================================================================
*
* 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 <bob@werken.com> and
* James Strachan <jstrachan@apache.org>. For more information on the
* Jaxen Project, please see <http://www.jaxen.org/>.
*
* $Id: SimpleVariableContext.java,v 1.19 2006/05/03 16:07:03 elharo Exp $
*/
package org.orbeon.jaxen;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/** Simple default implementation for <code>VariableContext</code>.
*
* <p>
* This is a simple table-based key-lookup implementation
* for <code>VariableContext</code> which can be programmatically
* extended by setting additional variables.
* </p>
*
* @author <a href="mailto:bob@werken.com">bob mcwhirter</a>
*/
public class SimpleVariableContext implements VariableContext, Serializable
{
/**
*
*/
private static final long serialVersionUID = 961322093794516518L;
/** Table of variable bindings. */
private Map variables;
/** Construct.
*
* <p>
* Create a new empty variable context.
* </p>
*/
public SimpleVariableContext()
{
variables = new HashMap();
}
/** Set the value associated with a variable.
*
* <p>
* This method sets a variable that is
* associated with a particular namespace.
* These variables appear such as <code>$prefix:foo</code>
* in an XPath expression. Prefix to URI resolution
* is the responsibility of a <code>NamespaceContext</code>.
* Variables within a <code>VariableContext</code> are
* referred to purely based upon their namespace URI,
* if any.
* </p>
*
* @param namespaceURI the namespace URI of the variable
* @param localName the local name of the variable
* @param value The value to be bound to the variable
*/
public void setVariableValue( String namespaceURI,
String localName,
Object value )
{
this.variables.put( new QualifiedName(namespaceURI, localName),
value );
}
/** Set the value associated with a variable.
*
* <p>
* This method sets a variable that is <strong>not</strong>
* associated with any particular namespace.
* These variables look like <code>$foo</code>
* in an XPath expression.
* </p>
*
* @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() );
}
}
}