Application: gvSIG desktop

/*

 * gvSIG. Desktop Geographic Information System.

 * 

 * Copyright (C) 2007-2020 gvSIG Association.

 * 

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 * 

 * This program 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 General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License 

 * along with this program. If not, see <https://www.gnu.org/licenses/>. 

 * 

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.sqlite.dal.functions;

import java.sql.SQLException;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryUtils;

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

import org.gvsig.sqlite.dal.geopackage.GeopackageGeometryBuilder;

import org.gvsig.sqlite.dal.geopackage.GeopackageGeometryParser;

import org.gvsig.sqlite.dal.geopackage.GeopackageUtils;

import org.sqlite.SQLiteConnection;

/**

 *

 * @author gvSIG Team

 */

@SuppressWarnings("UseSpecificCatch")

public class ST_ExtentAggregate extends Functions.AbstractAggregate {

    private Envelope env = null;

    private long count = 0;

    public ST_ExtentAggregate(SQLiteConnection conn) {

        super("ST_ExtentAggregate", conn);

    }

    @Override

    protected void xStep() throws SQLException {

        try {

            count++;

            byte[] bytes = value_blob(0);

            if (bytes == null) {

                return;

            }

            SQLiteConnection conn = this.getConnection();

            GeopackageGeometryParser parser = GeopackageUtils.createGeometryParser();

            parser.parseEnvelope(bytes);

            Envelope env_geom = parser.getEnvelope(conn);

            if (env_geom == null) {

                Geometry geom = parser.parseToGeometry(conn, bytes);

                if( geom!=null ) {

                    env_geom = geom.getEnvelope();

                }

            }

            if (env == null) {

                this.env = GeometryUtils.createEnvelope(Geometry.SUBTYPES.GEOM2D);

            }

            env.add(env_geom);

        } catch (Throwable ex) {

            throw new SQLException("Can't intersects geometries", ex);

        }

    }

    @Override

    protected void xFinal() throws SQLException {

        try {

            GeopackageGeometryBuilder builder = GeopackageUtils.createGeometryBuilder();

            builder.setGeometry(this.getConnection(), env.getGeometry());

            this.result(builder.build());

        } catch (Throwable ex) {

            throw new SQLException("Can't intersects geometries", ex);

        }

    }

}