WKBWriter.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: io/WKBWriter.java rev. 1.1 (JTS-1.7)
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
 
#include <geos/util/Machine.h> // for getMachineByteOrder
#include <geos/io/WKBConstants.h>
#include <iosfwd>
#include <cstdint>
#include <cstddef>
 
// Forward declarations
namespace geos {
namespace geom {
 
class CoordinateSequence;
class Geometry;
class GeometryCollection;
class Point;
class LineString;
class LinearRing;
class Polygon;
class MultiPoint;
class MultiLineString;
class MultiPolygon;
class PrecisionModel;
 
} // namespace geom
} // namespace geos
 
namespace geos {
namespace io {
 
class GEOS_DLL WKBWriter {
 
public:
    /*
     * \brief
     * Initializes writer with target coordinate dimension, endianness
     * flag and SRID value.
     *
     * @param dims Supported values are 2 or 3.  Note that 3 indicates
     * up to 3 dimensions will be written but 2D WKB is still produced for 2D geometries.
     * @param bo output byte order - default to native machine byte order.
     * Legal values include 0 (big endian/xdr) and 1 (little endian/ndr).
     * @param incudeSRID true if SRID should be included in WKB (an
     * extension).
     */
    WKBWriter(
        uint8_t dims = 2,
        int bo = getMachineByteOrder(),
        bool includeSRID = false,
        int flv = WKBConstants::wkbExtended);
 
    /*
     * \brief
     * Destructor.
     */
    ~WKBWriter() = default;
 
    /*
     * \brief
     * Returns the output dimension used by the
     * <code>WKBWriter</code>.
     */
    uint8_t
    getOutputDimension() const
    {
        return defaultOutputDimension;
    }
 
    /*
     * Sets the output dimension used by the <code>WKBWriter</code>.
     *
     * @param newOutputDimension Supported values are 2 or 3.
     * Note that 3 indicates up to 3 dimensions will be written but
     * 2D WKB is still produced for 2D geometries.
     */
    void setOutputDimension(uint8_t newOutputDimension);
 
    /*
     * \brief
     * Returns the byte order used by the
     * <code>WKBWriter</code>.
     */
    int
    getByteOrder() const
    {
        return byteOrder;
    }
 
    /*
     * Sets the byte order used by the
     * <code>WKBWriter</code>.
     */
    void setByteOrder(int newByteOrder);
 
    /*
     * \brief
     * Returns whether SRID values are output by the
     * <code>WKBWriter</code>.
     */
    bool
    getIncludeSRID() const
    {
        return includeSRID;
    }
 
    /*
     * Sets whether SRID values should be output by the
     * <code>WKBWriter</code>.
     */
    void
    setIncludeSRID(bool newIncludeSRID)
    {
        includeSRID = newIncludeSRID;
    }
 
    /*
     * \brief
     * Returns the WKB flavor the writer will emit.
     */
    int
    getFlavor() const
    {
        return flavor;
    }
 
    /*
     * \brief
     * Set the WKB flavor the writer will emit.
     */
    void setFlavor(int newFlavor);
 
    void write(const geom::Geometry& g, std::ostream& os);
    // throws IOException, ParseException
 
    void writeHEX(const geom::Geometry& g, std::ostream& os);
    // throws IOException, ParseException
 
private:
 
    // 2 or 3
    uint8_t defaultOutputDimension;
    uint8_t outputDimension;
 
    // WKBConstants::wkbwkbXDR | WKBConstants::wkbNDR
    int byteOrder;
    // WKBConstants::wkbIso | WKBConstants::wkbExtended
    int flavor;
 
    bool includeSRID;
 
    std::ostream* outStream;
 
    unsigned char buf[8];
 
    void writePoint(const geom::Point& p);
    void writePointEmpty(const geom::Point& p);
    // throws IOException
 
    void writeLineString(const geom::LineString& ls);
    // throws IOException
 
    void writePolygon(const geom::Polygon& p);
    // throws IOException
 
    void writeGeometryCollection(const geom::GeometryCollection& c, int wkbtype);
    // throws IOException, ParseException
 
    void writeCoordinateSequence(const geom::CoordinateSequence& cs, bool sized);
    // throws IOException
 
    void writeCoordinate(const geom::CoordinateSequence& cs, std::size_t idx, bool is3d);
    // throws IOException
 
    void writeGeometryType(int geometryType, int SRID);
    // throws IOException
 
    void writeSRID(int SRID);
    // throws IOException
 
    void writeByteOrder();
    // throws IOException
 
    void writeInt(int intValue);
    // throws IOException
 
};
 
} // namespace io
} // namespace geos