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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 - 2017 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;

import org.geolatte.geom.*;
import org.geolatte.geom.crs.CoordinateReferenceSystem;

/**
 * The HANA EWKB representation differs from the Postgis EWKB representation in
 * that HANA always requires an SRID to be written, even if its not specified or 0.
 *
 * @author Jonathan Bregler, SAP
 */
public class HANAWkbEncoder implements WkbEncoder {
    @Override
    public  ByteBuffer encode(Geometry
 geometry, ByteOrder byteOrder) {
        BaseWkbVisitor
 visitor = HANAWkbDialect.INSTANCE.mkVisitor(geometry, byteOrder);
        geometry.accept(visitor);
        return visitor.result();
    }
}

class HANAWkbVisitor
 extends BaseWkbVisitor
 {

    private boolean hasWrittenSrid = false;

    HANAWkbVisitor(ByteBuffer byteBuffer, WkbDialect dialect) {
        super(byteBuffer, dialect);
    }


    @Override
    protected void writeTypeCodeAndSrid(Geometry
 geometry, ByteBuffer output) {
        int typeCode = geometryTypeCode(geometry);
        CoordinateReferenceSystem
 crs = geometry.getCoordinateReferenceSystem();
        if (!this.hasWrittenSrid) {
            typeCode |= PostgisWkbTypeMasks.SRID_FLAG;
        }
        if (geometry.hasM()) {
            typeCode |= PostgisWkbTypeMasks.M_FLAG;
        }
        if (geometry.hasZ()) {
            typeCode |= PostgisWkbTypeMasks.Z_FLAG;
        }
        output.putUInt(typeCode);
        if (!this.hasWrittenSrid) {
            int srid = geometry.getSRID();
            // Write the SRID, the HANA default SRID is 0
            output.putInt(Math.max(srid, 0));
            this.hasWrittenSrid = true;
        }
    }

    protected int geometryTypeCode(Geometry geometry) {
        //empty geometries have the same representation as an empty geometry collection
        if (geometry.isEmpty() && geometry.getGeometryType() == GeometryType.POINT) {
            return WkbGeometryType.MULTI_POINT.getTypeCode();
        }
        WkbGeometryType type = WkbGeometryType.forClass(geometry.getClass());
        if (type == null) {
            throw new UnsupportedConversionException(
                    String.format(
                            "Can't convert geometries of type %s",
                            geometry.getClass().getCanonicalName()
                    )
            );
        }
        return type.getTypeCode();
    }
}