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This geoLatte-geom library offers a geometry model that conforms to the OGC Simple Features for SQL specification.

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/*
 * This file is part of the GeoLatte project.
 *
 *     GeoLatte 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 3 of the License, or
 *     (at your option) any later version.
 *
 *     GeoLatte 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 GeoLatte.  If not, see .
 *
 * Copyright (C) 2010 - 2013 and Ownership of code is shared by:
 * Qmino bvba - Romeinsestraat 18 - 3001 Heverlee  (http://www.qmino.com)
 * Geovise bvba - Generaal Eisenhowerlei 9 - 2140 Antwerpen (http://www.geovise.com)
 */

package org.geolatte.geom.codec.db.sqlserver;

import org.geolatte.geom.Geometry;
import org.geolatte.geom.codec.db.Encoder;

import java.util.ArrayList;
import java.util.List;

/**
 * Serializes a JTS Geometry to a byte-array.
 *
 * @author Karel Maesen, Geovise BVBA.
 */
public class Encoders {

    final private static List ENCODERS = new ArrayList();


    static {
        //Encoders
        ENCODERS.add(new PointSqlServerEncoder());
        ENCODERS.add(new LineStringSqlServerEncoder());
        ENCODERS.add(new PolygonSqlServerEncoder());
        ENCODERS.add(new GeometryCollectionSqlServerEncoder(OpenGisType.MULTIPOINT));
        ENCODERS.add(new GeometryCollectionSqlServerEncoder(OpenGisType.MULTILINESTRING));
        ENCODERS.add(new GeometryCollectionSqlServerEncoder(OpenGisType.MULTIPOLYGON));
        ENCODERS.add(new GeometryCollectionSqlServerEncoder(OpenGisType.GEOMETRYCOLLECTION));

    }

    public static Encoder encoderFor(Geometry geom) {
        for (Encoder encoder : ENCODERS) {
            if (encoder.accepts(geom)) {
                return encoder;
            }
        }
        throw new IllegalArgumentException("No encoder for type " + geom.getGeometryType());
    }

    public static byte[] encode(Geometry geom) {
        Encoder encoder = encoderFor(geom);
        SqlServerGeometry sqlServerGeometry = encoder.encode(geom);
        return SqlServerGeometry.serialize(sqlServerGeometry);
    }

}