Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractGeometryFunction;

import org.gvsig.fmap.geom.Geometry;

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

public class STNumPointsFunction extends AbstractGeometryFunction {

    public STNumPointsFunction() {

        super("OGC", "ST_NumPoints", Range.is(1));

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) throws Exception {

        Geometry geom = getGeom(args, 0);

        if ( geom instanceof OrientablePrimitive ) {

            int n = ((OrientablePrimitive) geom).getNumVertices();

            return n;

        }

        return null;

    }

}