TWKBWriter.PrecisionWriter Class Reference

Inheritance diagram for TWKBWriter.PrecisionWriter:

Collaboration diagram for TWKBWriter.PrecisionWriter:

Public Member Functions
PrecisionWriter	calculate (final Coordinate[] coordinates, final int maxPrecision)
void	writeExtendedPrecision (final DataOutput output) throws IOException
void	writePoint (final Coordinate coordinate, final DataOutput output) throws IOException
void	writePointArray (final Coordinate[] coordinates, final DataOutput output) throws IOException

Protected Member Functions
void	checkCoordinate (final Coordinate c)
void	finalize (final int maxPrecision)

Protected Attributes
double	precisionMultiplier = 0

Private Attributes
int	precision = TWKBUtils.MIN_COORD_PRECISION

Member Function Documentation

calculate()

PrecisionWriter calculate	(	final Coordinate []	coordinates,
		final int	maxPrecision
	)

References TWKBWriter.PrecisionWriter.checkCoordinate(), and TWKBWriter.PrecisionWriter.finalize().

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

                                                                                             {
      for (int i = 0; i < coordinates.length; i++) {
        checkCoordinate(coordinates[i]);
      }
      finalize(maxPrecision);
      return this;
    }

checkCoordinate()

void checkCoordinate ( final Coordinate  c )

protected

References Coordinate.getX(), Coordinate.getY(), and TWKBWriter.PrecisionWriter.precision.

Referenced by TWKBWriter.PrecisionWriter.calculate().

                                                       {
      final BigDecimal xCoord = new BigDecimal(Double.toString(c.getX())).stripTrailingZeros();
      precision = Math.max(xCoord.scale(), precision);
      final BigDecimal yCoord = new BigDecimal(Double.toString(c.getY())).stripTrailingZeros();
      precision = Math.max(yCoord.scale(), precision);
    }

finalize()

void finalize ( final int  maxPrecision )

protected

Referenced by TWKBWriter.PrecisionWriter.calculate().

                                                    {
      precision = Math.min(maxPrecision, precision);
      precisionMultiplier = Math.pow(10, precision);
    }

writeExtendedPrecision()

void writeExtendedPrecision

(

final DataOutput

output

)

throws IOException

Referenced by TWKBWriter.write().

                                                                                   {
      return;
    }

writePoint()

void writePoint	(	final Coordinate	coordinate,
		final DataOutput	output
	)		throws IOException

References TWKBWriter.PrecisionWriter.precisionMultiplier.

                           {
      Varint.writeSignedVarLong(Math.round(coordinate.getX() * precisionMultiplier), output);
      Varint.writeSignedVarLong(Math.round(coordinate.getY() * precisionMultiplier), output);
    }

writePointArray()

void writePointArray	(	final Coordinate []	coordinates,
		final DataOutput	output
	)		throws IOException

References TWKBWriter.PrecisionWriter.precisionMultiplier.

                           {
      long lastX = 0;
      long lastY = 0;
      Varint.writeUnsignedVarInt(coordinates.length, output);
      for (final Coordinate c : coordinates) {
        final long x = Math.round(c.getX() * precisionMultiplier);
        final long y = Math.round(c.getY() * precisionMultiplier);
        Varint.writeSignedVarLong(x - lastX, output);
        Varint.writeSignedVarLong(y - lastY, output);
        lastX = x;
        lastY = y;
      }
    }

Member Data Documentation

precision

int precision = TWKBUtils.MIN_COORD_PRECISION

private

Referenced by TWKBWriter.PrecisionWriter.checkCoordinate(), and TWKBWriter.write().

precisionMultiplier

double precisionMultiplier = 0

protected

Referenced by TWKBWriter.PrecisionWriter.writePoint(), TWKBWriter.PrecisionWriter.writePointArray(), and TWKBWriter.ExtendedPrecisionWriter.writePointArray().