TWKBWriter Class Reference

Collaboration diagram for TWKBWriter:

Classes
class	ExtendedPrecisionWriter
class	PrecisionWriter

Public Member Functions
	TWKBWriter ()
	TWKBWriter (final int maxPrecision)
byte[]	write (final Geometry geom)
void	write (final Geometry geom, final DataOutput output) throws IOException

Private Member Functions
void	writePoint (final Point point, final PrecisionWriter precision, final DataOutput output) throws IOException
void	writeLineString (final LineString line, final PrecisionWriter precision, final DataOutput output) throws IOException
void	writePolygon (final Polygon polygon, final PrecisionWriter precision, final DataOutput output) throws IOException
void	writeMultiPoint (final MultiPoint multiPoint, final PrecisionWriter precision, final DataOutput output) throws IOException
void	writeMultiLineString (final MultiLineString multiLine, final PrecisionWriter precision, final DataOutput output) throws IOException
void	writeMultiPolygon (final MultiPolygon multiPolygon, final PrecisionWriter precision, final DataOutput output) throws IOException
void	writeGeometryCollection (final GeometryCollection geoms, final PrecisionWriter precision, final DataOutput output) throws IOException
byte	getTypeAndPrecisionByte (final byte type, final int precision)
byte	getType (final Geometry geom)

Private Attributes
final int	maxPrecision

Constructor & Destructor Documentation

TWKBWriter() [1/2]

TWKBWriter

(

)

                      {
    this(TWKBUtils.MAX_COORD_PRECISION);
  }

References TWKBUtils.MAX_COORD_PRECISION.

TWKBWriter() [2/2]

TWKBWriter

(

final int

maxPrecision

)

                                            {
    this.maxPrecision = Math.min(TWKBUtils.MAX_COORD_PRECISION, maxPrecision);
  }

References TWKBUtils.MAX_COORD_PRECISION, and TWKBWriter.maxPrecision.

Member Function Documentation

getType()

byte getType ( final Geometry  geom )

private

                                            {
    if (geom instanceof Point) {
      return TWKBUtils.POINT_TYPE;
    } else if (geom instanceof LineString) {
      return TWKBUtils.LINESTRING_TYPE;
    } else if (geom instanceof Polygon) {
      return TWKBUtils.POLYGON_TYPE;
    } else if (geom instanceof MultiPoint) {
      return TWKBUtils.MULTIPOINT_TYPE;
    } else if (geom instanceof MultiLineString) {
      return TWKBUtils.MULTILINESTRING_TYPE;
    } else if (geom instanceof MultiPolygon) {
      return TWKBUtils.MULTIPOLYGON_TYPE;
    }
    return TWKBUtils.GEOMETRYCOLLECTION_TYPE;
  }

References TWKBUtils.GEOMETRYCOLLECTION_TYPE, TWKBUtils.LINESTRING_TYPE, TWKBUtils.MULTILINESTRING_TYPE, TWKBUtils.MULTIPOINT_TYPE, TWKBUtils.MULTIPOLYGON_TYPE, TWKBUtils.POINT_TYPE, and TWKBUtils.POLYGON_TYPE.

Referenced by TWKBWriter.write().

getTypeAndPrecisionByte()

byte getTypeAndPrecisionByte ( final byte  type, final int  precision  )

private

                                                                             {
    byte typeAndPrecision = type;
    typeAndPrecision |= TWKBUtils.zigZagEncode(precision) << 4;
    return typeAndPrecision;
  }

References TWKBUtils.zigZagEncode().

Referenced by TWKBWriter.write().

write() [1/2]

byte [] write

(

final Geometry

geom

)

                                           {
    try (final ByteArrayOutputStream out = new ByteArrayOutputStream()) {
      try (final DataOutputStream output = new DataOutputStream(out)) {
        write(geom, output);
        return out.toByteArray();
      }
    } catch (final IOException e) {
      throw new RuntimeException("Error writing TWKB geometry.", e);
    }
  }

Referenced by TWKBWriterr.write(), and TWKBWriter.writeGeometryCollection().

write() [2/2]

void write	(	final Geometry	geom,
		final DataOutput	output
	)		throws IOException

                                                                                     {
    final byte type = getType(geom);
    if (geom.isEmpty()) {
      output.writeByte(getTypeAndPrecisionByte(type, 0));
      output.writeByte(TWKBUtils.EMPTY_GEOMETRY);
      return;
    }
    byte metadata = 0;
    final Coordinate[] coordinates = geom.getCoordinates();
    PrecisionWriter precision;
    if (Double.isNaN(coordinates[0].getZ()) || Double.isNaN(coordinates[0].getM())) {
      metadata |= TWKBUtils.EXTENDED_DIMENSIONS;
      precision = new ExtendedPrecisionWriter().calculate(coordinates, maxPrecision);
    } else {
      precision = new PrecisionWriter().calculate(coordinates, maxPrecision);
    }
    output.writeByte(getTypeAndPrecisionByte(type, precision.precision));
    output.writeByte(metadata);
    precision.writeExtendedPrecision(output);
 
    switch (type) {
      case TWKBUtils.POINT_TYPE:
        writePoint((Point) geom, precision, output);
        break;
      case TWKBUtils.LINESTRING_TYPE:
        writeLineString((LineString) geom, precision, output);
        break;
      case TWKBUtils.POLYGON_TYPE:
        writePolygon((Polygon) geom, precision, output);
        break;
      case TWKBUtils.MULTIPOINT_TYPE:
        writeMultiPoint((MultiPoint) geom, precision, output);
        break;
      case TWKBUtils.MULTILINESTRING_TYPE:
        writeMultiLineString((MultiLineString) geom, precision, output);
        break;
      case TWKBUtils.MULTIPOLYGON_TYPE:
        writeMultiPolygon((MultiPolygon) geom, precision, output);
        break;
      case TWKBUtils.GEOMETRYCOLLECTION_TYPE:
        writeGeometryCollection((GeometryCollection) geom, precision, output);
        break;
      default:
        break;
    }
  }

References TWKBWriter.PrecisionWriter.calculate(), TWKBWriter.ExtendedPrecisionWriter.calculate(), TWKBUtils.EMPTY_GEOMETRY, TWKBUtils.EXTENDED_DIMENSIONS, TWKBUtils.GEOMETRYCOLLECTION_TYPE, TWKBWriter.getType(), TWKBWriter.getTypeAndPrecisionByte(), TWKBUtils.LINESTRING_TYPE, TWKBWriter.maxPrecision, TWKBUtils.MULTILINESTRING_TYPE, TWKBUtils.MULTIPOINT_TYPE, TWKBUtils.MULTIPOLYGON_TYPE, TWKBUtils.POINT_TYPE, TWKBUtils.POLYGON_TYPE, TWKBWriter.PrecisionWriter.precision, TWKBWriter.PrecisionWriter.writeExtendedPrecision(), TWKBWriter.writeGeometryCollection(), TWKBWriter.writeLineString(), TWKBWriter.writeMultiLineString(), TWKBWriter.writeMultiPoint(), TWKBWriter.writeMultiPolygon(), TWKBWriter.writePoint(), and TWKBWriter.writePolygon().

writeGeometryCollection()

void writeGeometryCollection ( final GeometryCollection  geoms, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    Varint.writeUnsignedVarInt(geoms.getNumGeometries(), output);
    for (int i = 0; i < geoms.getNumGeometries(); i++) {
      final Geometry geom = geoms.getGeometryN(i);
      write(geom, output);
    }
  }

References TWKBWriter.write().

Referenced by TWKBWriter.write().

writeLineString()

void writeLineString ( final LineString  line, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    precision.writePointArray(line.getCoordinates(), output);
  }

Referenced by TWKBWriter.write().

writeMultiLineString()

void writeMultiLineString ( final MultiLineString  multiLine, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    Varint.writeUnsignedVarInt(multiLine.getNumGeometries(), output);
    for (int i = 0; i < multiLine.getNumGeometries(); i++) {
      precision.writePointArray(multiLine.getGeometryN(i).getCoordinates(), output);
    }
  }

Referenced by TWKBWriter.write().

writeMultiPoint()

void writeMultiPoint ( final MultiPoint  multiPoint, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    precision.writePointArray(multiPoint.getCoordinates(), output);
  }

Referenced by TWKBWriter.write().

writeMultiPolygon()

void writeMultiPolygon ( final MultiPolygon  multiPolygon, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    Varint.writeUnsignedVarInt(multiPolygon.getNumGeometries(), output);
    for (int i = 0; i < multiPolygon.getNumGeometries(); i++) {
      final Polygon polygon = (Polygon) multiPolygon.getGeometryN(i);
      if (polygon.isEmpty()) {
        Varint.writeUnsignedVarInt(0, output);
        continue;
      }
      Varint.writeUnsignedVarInt(polygon.getNumInteriorRing() + 1, output);
      precision.writePointArray(polygon.getExteriorRing().getCoordinates(), output);
      for (int j = 0; j < polygon.getNumInteriorRing(); j++) {
        precision.writePointArray(polygon.getInteriorRingN(j).getCoordinates(), output);
      }
    }
  }

Referenced by TWKBWriter.write().

writePoint()

void writePoint ( final Point  point, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    precision.writePoint(point.getCoordinate(), output);
  }

Referenced by TWKBWriter.write().

writePolygon()

void writePolygon ( final Polygon  polygon, final PrecisionWriter  precision, final DataOutput  output  ) throws IOException

private

                                                  {
    Varint.writeUnsignedVarInt(polygon.getNumInteriorRing() + 1, output);
    precision.writePointArray(polygon.getExteriorRing().getCoordinates(), output);
    for (int i = 0; i < polygon.getNumInteriorRing(); i++) {
      precision.writePointArray(polygon.getInteriorRingN(i).getCoordinates(), output);
    }
  }

Referenced by TWKBWriter.write().

Member Data Documentation

maxPrecision

final int maxPrecision

private

Referenced by TWKBWriter.PrecisionWriter.calculate(), TWKBWriter.ExtendedPrecisionWriter.calculate(), TWKBWriter.PrecisionWriter.finalize(), TWKBWriter.ExtendedPrecisionWriter.finalize(), TWKBWriter.TWKBWriter(), and TWKBWriter.write().