/*
 * $Id: MySQLGeometryEquality.java 194 2010-03-26 15:56:45Z maesenka $
 *
 * This file is part of Hibernate Spatial, an extension to the
 * hibernate ORM solution for geographic data.
 *
 * Copyright © 2007-2010 Geovise BVBA
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, visit: http://www.hibernatespatial.org/
 */

package org.hibernatespatial.mysql;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import org.hibernatespatial.test.GeometryEquality;

/**
 * Extends the test for geometry equality, because
 * MySQL stores empty geometries as NULL objects.
 */
public class MySQLGeometryEquality extends GeometryEquality {

    @Override
    public boolean test(Geometry geom1, Geometry geom2) {
        if (geom1 != null && geom1.isEmpty())
            return geom2 == null || geom2.isEmpty();
        return super.test(geom1, geom2);
    }

    @Override
    protected boolean testSimpleGeometryEquality(Geometry geom1, Geometry geom2) {
        return testVerticesEquality(geom1, geom2);
    }

    private boolean testVerticesEquality(Geometry geom1, Geometry geom2) {
        if (geom1.getNumPoints() != geom2.getNumPoints()) return false;
        for (int i = 0; i < geom1.getNumPoints(); i++) {
            Coordinate cn1 = geom1.getCoordinates()[i];
            Coordinate cn2 = geom2.getCoordinates()[i];
            if (!cn1.equals2D(cn2)) return false;
        }
        return true;
    }
}