Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.spatial;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.primitive.OrientablePrimitive;

import org.gvsig.fmap.geom.primitive.Point;

public class STPointNFunction extends AbstractFunction {

    public STPointNFunction() {

        super("OGC", "ST_PointN", Range.is(2));

    }

    @Override

    public Object call(Object[] args)  throws Exception {

        Geometry geom = getGeom(args, 0);

        if ( geom instanceof OrientablePrimitive ) {

            Point n = ((OrientablePrimitive) geom).getVertex(getInt(args, 1));

            return n;

        }

        return null;

    }

}