/*
* Geotoolkit - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2014, Geomatys
*
* 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.geotoolkit.filter.function.geometry;
import com.vividsolutions.jts.geom.Geometry;
import org.geotoolkit.filter.function.AbstractFunction;
import org.opengis.filter.expression.Expression;
/**
* JTS geometry buffer.
*
* @author Johann Sorel (Geomatys)
*/
public class BufferFunction extends AbstractFunction {
public BufferFunction(final Expression expr1, final Expression expr2) {
super(GeometryFunctionFactory.BUFFER, new Expression[] {expr1, expr2}, null);
}
@Override
public Object evaluate(final Object feature) {
final Geometry geom;
double width;
try {
geom = parameters.get(0).evaluate(feature,Geometry.class);
width = parameters.get(1).evaluate(feature,Number.class).doubleValue();
} catch (Exception e){
throw new IllegalArgumentException("Invalid function parameter."+
parameters.get(0)+" "+parameters.get(1));
}
if(width==0) return geom;
final Geometry geomBuf = geom.buffer(width);
geomBuf.setSRID(geom.getSRID());
geomBuf.setUserData(geom.getUserData());
return geomBuf;
}
}