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Jaxen is a universal Java XPath engine.
/*
* $Header$
* $Revision$
* $Date$
*
* ====================================================================
*
* 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
* 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 .
*
* $Id$
*/
package org.jaxen.function;
import java.util.List;
import org.jaxen.Context;
import org.jaxen.Function;
import org.jaxen.FunctionCallException;
/**
* 4.3 boolean false()
*
*
Returns false.
*
* @author bob mcwhirter (bob @ werken.com)
*
* @see Section 4.3 of the XPath Specification
*/
public class FalseFunction implements Function
{
/**
* Create a new FalseFunction
object.
*/
public FalseFunction() {}
/** Returns Boolean.FALSE
*
* @param context the context at the point in the
* expression when the function is called
* @param args an empty list
*
* @return Boolean.FALSE
*
* @throws FunctionCallException if args
is not empty
*/
public Object call(Context context,
List args) throws FunctionCallException
{
if (args.size() == 0)
{
return evaluate();
}
throw new FunctionCallException( "false() requires no arguments." );
}
/**
* Returns false.
*
* @return Boolean.FALSE
*/
public static Boolean evaluate()
{
return Boolean.FALSE;
}
}