TWKBReader.ExtendedPrecisionReader Class Reference

Inheritance diagram for TWKBReader.ExtendedPrecisionReader:

Collaboration diagram for TWKBReader.ExtendedPrecisionReader:

Public Member Functions
	ExtendedPrecisionReader (final int precision, final byte extendedDimensions)
Coordinate	readPoint (final DataInput input) throws IOException
Coordinate []	readPointArray (final DataInput input) throws IOException

Protected Attributes
double	precisionMultiplier

Private Attributes
boolean	hasZ = false
double	zPrecisionMultiplier = 0
boolean	hasM = false
double	mPrecisionMultiplier = 0

Constructor & Destructor Documentation

ExtendedPrecisionReader()

ExtendedPrecisionReader	(	final int	precision,
		final byte	extendedDimensions
	)

References TWKBUtils.zigZagDecode().

                                                                                      {
     super(precision);
     if ((extendedDimensions & 0x1) != 0) {
       hasZ = true;
       zPrecisionMultiplier =
           Math.pow(10, TWKBUtils.zigZagDecode((extendedDimensions >> 2) & 0x7));
     }
     if ((extendedDimensions & 0x2) != 0) {
       hasM = true;
       mPrecisionMultiplier =
           Math.pow(10, TWKBUtils.zigZagDecode((extendedDimensions >> 5) & 0x7));
     }
   }

Member Function Documentation

readPoint()

Coordinate readPoint

(

final DataInput

input

)

throws IOException

References Coordinate.setM(), and Coordinate.setZ().

                                                                         {
     final Coordinate coordinate = super.readPoint(input);
     if (hasZ) {
       coordinate.setZ(Varint.readSignedVarLong(input) / zPrecisionMultiplier);
     }
     if (hasM) {
       coordinate.setM(Varint.readSignedVarLong(input) / mPrecisionMultiplier);
     }
     return coordinate;
   }

readPointArray()

Coordinate [] readPointArray

(

final DataInput

input

)

throws IOException

References Coordinate.setM(), and Coordinate.setZ().

                                                                                {
     final int numCoordinates = Varint.readUnsignedVarInt(input);
     final Coordinate[] coordinates = new Coordinate[numCoordinates];
     long lastX = 0;
     long lastY = 0;
     long lastZ = 0;
     long lastM = 0;
     for (int i = 0; i < numCoordinates; i++) {
       lastX = Varint.readSignedVarLong(input) + lastX;
       lastY = Varint.readSignedVarLong(input) + lastY;
       coordinates[i] =
           new Coordinate((lastX) / precisionMultiplier, (lastY) / precisionMultiplier);
       if (hasZ) {
         lastZ = Varint.readSignedVarLong(input) + lastZ;
         coordinates[i].setZ((lastZ) / zPrecisionMultiplier);
       }
       if (hasM) {
         lastM = Varint.readSignedVarLong(input) + lastM;
         coordinates[i].setM((lastM) / mPrecisionMultiplier);
       }
     }
     return coordinates;
   }

Member Data Documentation

hasM

boolean hasM = false

private

hasZ

boolean hasZ = false

private

mPrecisionMultiplier

double mPrecisionMultiplier = 0

private

precisionMultiplier

double precisionMultiplier

protectedinherited

zPrecisionMultiplier

double zPrecisionMultiplier = 0

private