org.jaxen.function.LastFunction Maven / Gradle / Ivy
/*
* $Header$
* $Revision$
* $Date$
*
* ====================================================================
*
* 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
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* 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 .
*
* $Id$
*/
package org.jaxen.function;
import java.util.List;
import org.jaxen.Context;
import org.jaxen.Function;
/**
* 4.1 number last()
*
*
* The last function returns a number equal to
* the context size from the expression evaluation context.
*
*
* @author bob mcwhirter (bob @ werken.com)
* @see Section 4.1 of the XPath Specification
*/
@SuppressWarnings({"rawtypes"})
public class LastFunction implements Function
{
/**
* Create a new LastFunction
object.
*/
public LastFunction() {}
/**
* Returns the number of nodes in the context node-set.
*
* @param context the context at the point in the
* expression where the function is called
* @param args an empty list
*
* @return a Double
containing the context size
*
* @ if args
is not empty
*
* @see Context#getSize()
*/
public Object call(Context context,
List args)
{
if (args.size() == 0)
{
return evaluate( context );
}
throw new RuntimeException( "last() requires no arguments." );
}
/**
* Returns the number of nodes in the context node-set.
*
* @param context the context at the point in the
* expression where the function is called
*
* @return the context size
*
* @see Context#getSize()
*/
public static Double evaluate(Context context)
{
return Double.valueOf( context.getSize() );
}
}