TWKBReader Class Reference

Collaboration diagram for TWKBReader:

Classes
class	ByteBufferInputStream
class	ExtendedPrecisionReader
class	PrecisionReader

Public Member Functions
	TWKBReader ()
Geometry	read (final ByteBuffer bytes) throws ParseException
Geometry	read (final byte[] bytes) throws ParseException
Geometry	read (final DataInput input) throws IOException

Private Member Functions
Point	readPoint (final PrecisionReader precision, final byte metadata, final DataInput input) throws IOException
LineString	readLineString (final PrecisionReader precision, final byte metadata, final DataInput input) throws IOException
Polygon	readPolygon (final PrecisionReader precision, final byte metadata, final DataInput input) throws IOException
MultiPoint	readMultiPoint (final PrecisionReader precision, final byte metadata, final DataInput input) throws IOException
MultiLineString	readMultiLineString (final PrecisionReader precision, final byte metadata, final DataInput input) throws IOException
MultiPolygon	readMultiPolygon (final PrecisionReader precision, final byte metadata, final DataInput input) throws IOException
GeometryCollection	readGeometryCollection (final DataInput input, final byte metadata) throws IOException

Static Private Attributes
static final GeometryFactory	fac =new GeometryFactory()

Constructor & Destructor Documentation

TWKBReader()

TWKBReader

(

)

{}

Member Function Documentation

read() [1/3]

Geometry read

(

final ByteBuffer

bytes

)

throws ParseException

References TWKBReader.ByteBufferInputStream.ByteBufferInputStream(), and TWKBReader.ByteBufferInputStream.read().

Referenced by TWKBDatatype.read().

                                                                    {
   try (ByteBufferInputStream in = new ByteBufferInputStream(bytes)) {
     try (DataInputStream input = new DataInputStream(in)) {
       return read(input);
     }
   } catch (final IOException e) {
     throw new ParseException("Error reading TWKB geometry.", e);
   }
 }

read() [2/3]

Geometry read

(

final byte []

bytes

)

throws ParseException

References TWKBReader.ByteBufferInputStream.read().

                                                                {
   try (ByteArrayInputStream in = new ByteArrayInputStream(bytes)) {
     try (DataInputStream input = new DataInputStream(in)) {
       return read(input);
     }
   } catch (final IOException e) {
     throw new ParseException("Error reading TWKB geometry.", e);
   }
 }

read() [3/3]

Geometry read

(

final DataInput

input

)

throws IOException

References TWKBUtils.EXTENDED_DIMENSIONS, TWKBUtils.GEOMETRYCOLLECTION_TYPE, TWKBUtils.LINESTRING_TYPE, TWKBUtils.MULTILINESTRING_TYPE, TWKBUtils.MULTIPOINT_TYPE, TWKBUtils.MULTIPOLYGON_TYPE, TWKBUtils.POINT_TYPE, TWKBUtils.POLYGON_TYPE, TWKBReader.readGeometryCollection(), TWKBReader.readLineString(), TWKBReader.readMultiLineString(), TWKBReader.readMultiPoint(), TWKBReader.readMultiPolygon(), TWKBReader.readPoint(), TWKBReader.readPolygon(), and TWKBUtils.zigZagDecode().

                                                                {
   final byte typeAndPrecision = input.readByte();
   final byte type = (byte) (typeAndPrecision & 0x0F);
   final int basePrecision = TWKBUtils.zigZagDecode((typeAndPrecision & 0xF0) >> 4);
   final byte metadata = input.readByte();
   PrecisionReader precision;
   if ((metadata & TWKBUtils.EXTENDED_DIMENSIONS) != 0) {
     final byte extendedDimensions = input.readByte();
     precision = new ExtendedPrecisionReader(basePrecision, extendedDimensions);
   } else {
     precision = new PrecisionReader(basePrecision);
   }
   switch (type) {
     case TWKBUtils.POINT_TYPE:
       return readPoint(precision, metadata, input);
     case TWKBUtils.LINESTRING_TYPE:
       return readLineString(precision, metadata, input);
     case TWKBUtils.POLYGON_TYPE:
       return readPolygon(precision, metadata, input);
     case TWKBUtils.MULTIPOINT_TYPE:
       return readMultiPoint(precision, metadata, input);
     case TWKBUtils.MULTILINESTRING_TYPE:
       return readMultiLineString(precision, metadata, input);
     case TWKBUtils.MULTIPOLYGON_TYPE:
       return readMultiPolygon(precision, metadata, input);
     case TWKBUtils.GEOMETRYCOLLECTION_TYPE:
       return readGeometryCollection(input, metadata);
   }
   return null;
 }

readGeometryCollection()

GeometryCollection readGeometryCollection ( final DataInput  input, final byte  metadata  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY, and TWKBReader.ByteBufferInputStream.read().

Referenced by TWKBReader.read().

                        {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createGeometryCollection();
   }
   final int numGeometries = Varint.readUnsignedVarInt(input);
   final Geometry[] geometries = new Geometry[numGeometries];
   for (int i = 0; i < numGeometries; i++) {
     geometries[i] = read(input);
   }
   return fac.createGeometryCollection(geometries);
 }

readLineString()

LineString readLineString ( final PrecisionReader  precision, final byte  metadata, final DataInput  input  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY.

Referenced by TWKBReader.read().

                                               {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createLineString();
   }

   final Coordinate[] coordinates = precision.readPointArray(input);
   return fac.createLineString(coordinates);
 }

readMultiLineString()

MultiLineString readMultiLineString ( final PrecisionReader  precision, final byte  metadata, final DataInput  input  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY.

Referenced by TWKBReader.read().

                                               {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createMultiLineString();
   }
   final int numLines = Varint.readUnsignedVarInt(input);
   final LineString[] lines = new LineString[numLines];
   for (int i = 0; i < numLines; i++) {
     lines[i] = fac.createLineString(precision.readPointArray(input));
   }
   return fac.createMultiLineString(lines);
 }

readMultiPoint()

MultiPoint readMultiPoint ( final PrecisionReader  precision, final byte  metadata, final DataInput  input  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY.

Referenced by TWKBReader.read().

                                               {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createMultiPoint();
   }
   final Coordinate[] points = precision.readPointArray(input);
   return fac.createMultiPointFromCoords(points);
 }

readMultiPolygon()

MultiPolygon readMultiPolygon ( final PrecisionReader  precision, final byte  metadata, final DataInput  input  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY.

Referenced by TWKBReader.read().

                                               {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createMultiPolygon();
   }
   final int numPolygons = Varint.readUnsignedVarInt(input);
   final Polygon[] polygons = new Polygon[numPolygons];
   int numRings;
   for (int i = 0; i < numPolygons; i++) {
     numRings = Varint.readUnsignedVarInt(input);
     if (numRings == 0) {
       polygons[i] = fac.createPolygon();
       continue;
     }
     final LinearRing exteriorRing =
         fac.createLinearRing(precision.readPointArray(input));
     final LinearRing[] interiorRings = new LinearRing[numRings - 1];
     for (int j = 0; j < (numRings - 1); j++) {
       interiorRings[j] =
           fac.createLinearRing(precision.readPointArray(input));
     }
     polygons[i] = fac.createPolygon(exteriorRing, interiorRings);
   }
   return fac.createMultiPolygon(polygons);
 }

readPoint()

Point readPoint ( final PrecisionReader  precision, final byte  metadata, final DataInput  input  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY.

Referenced by TWKBReader.read().

                                               {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createPoint();
   }

   final Coordinate coordinate = precision.readPoint(input);
   return fac.createPoint(coordinate);
 }

readPolygon()

Polygon readPolygon ( final PrecisionReader  precision, final byte  metadata, final DataInput  input  ) throws IOException

private

References TWKBUtils.EMPTY_GEOMETRY.

Referenced by TWKBReader.read().

                                               {
   if ((metadata & TWKBUtils.EMPTY_GEOMETRY) != 0) {
     return fac.createPolygon();
   }
   final int numRings = Varint.readUnsignedVarInt(input);
   final LinearRing exteriorRing =
       fac.createLinearRing(precision.readPointArray(input));
   final LinearRing[] interiorRings = new LinearRing[numRings - 1];
   for (int i = 0; i < (numRings - 1); i++) {
     interiorRings[i] =
         fac.createLinearRing(precision.readPointArray(input));
   }
   return fac.createPolygon(exteriorRing, interiorRings);
 }

Member Data Documentation

fac

final GeometryFactory fac =new GeometryFactory()

staticprivate