/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 */
package org.geotools.filter.function.math;

import org.geotools.filter.FunctionExpressionImpl;


/**
 * Allow access to the value of Math.PI as an expression
 * 
 * @author Jody Garnett
 * @since 2.2, 2.5
 *
 *
 * @source $URL$
 */
public class PiFunction extends FunctionExpressionImpl {

	public PiFunction() {
	    super("pi");
	}

	public int getArgCount() {
		return 0;
	}

	public String toString() {
		return "PI()";
	}

	@Override
	public Object evaluate( Object object ) {
	    return new Double( Math.PI );
	}

}