/*
* 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;
import org.geotools.filter.capability.FunctionNameImpl;
import org.opengis.filter.capability.FunctionName;
/**
* 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 static FunctionName NAME = new FunctionNameImpl("pi",
Double.class);
public PiFunction() {
super(NAME);
}
public String toString() {
return "PI()";
}
@Override
public Object evaluate( Object object ) {
return new Double( Math.PI );
}
}