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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/SimpleFunctionContext.java,v 1.14 2006/02/05 21:47:41 elharo Exp $
 * $Revision: 1.14 $
 * $Date: 2006/02/05 21:47:41 $
 *
 * ====================================================================
 *
 * 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: SimpleFunctionContext.java,v 1.14 2006/02/05 21:47:41 elharo Exp $
 */


package org.navimatrix.jaxen;

import java.util.HashMap;

/** Simple default implementation of FunctionContext.
 *
 *  

* This is a simple table-based key-lookup implementation * for FunctionContext which can be programmatically * extended by registering additional functions. *

* * @see XPathFunctionContext * * @author bob mcwhirter */ public class SimpleFunctionContext implements FunctionContext { /** Table of functions. */ private HashMap functions; /** *

* Construct an empty function context. *

*/ public SimpleFunctionContext() { this.functions = new HashMap(); } /** Register a new function. * *

* By registering a new function, any XPath expression * that utilizes this FunctionContext may * refer to and use the new function. *

* *

* Functions may exist either in a namespace or not. * Namespace prefix-to-URI resolution is the responsibility * of a {@link NamespaceContext}. Within this FunctionContext * functions are only referenced using the URI, not * the prefix. *

* *

* The namespace URI of a function may be null * to indicate that it exists without a namespace. *

* * @param namespaceURI the namespace URI of the function to * be registered with this context * @param localName the non-prefixed local portion of the * function to be registered with this context * @param function a {@link Function} implementation object * to be used when evaluating the function */ public void registerFunction(String namespaceURI, String localName, Function function ) { this.functions.put( new QualifiedName(namespaceURI, localName), function ); } public Function getFunction(String namespaceURI, String prefix, String localName ) throws UnresolvableException { QualifiedName key = new QualifiedName( namespaceURI, localName ); if ( this.functions.containsKey(key) ) { return (Function) this.functions.get( key ); } else { throw new UnresolvableException( "No Such Function " + key.getClarkForm() ); } } }




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