Package net.postgis.jdbc.geometry.binary

Class BinaryWriter

java.lang.Object
net.postgis.jdbc.geometry.binary.BinaryWriter
public class BinaryWriter extends Object
Create binary representation of geometries. Currently, only text rep (hexed) implementation is tested. It should be easy to add char[] and CharSequence ByteGetter instances, although the latter one is not compatible with older jdks. I did not implement real unsigned 32-bit integers or emulate them with long, as both java Arrays and Strings currently can have only 2^31-1 elements (bytes), so we cannot even get or build Geometries with more than approx. 2^28 coordinates (8 bytes each).
Author:
[email protected]

  • Constructor Details

    • BinaryWriter

      public BinaryWriter()

  • Method Details

    • valueSetterForEndian

      public static ValueSetter valueSetterForEndian(ByteSetter bytes, byte endian)
      Get the appropriate ValueGetter for my endianness
      Parameters:
      bytes - The ByteSetter to use
      endian - the endian for the ValueSetter to use
      Returns:
      the ValueGetter

    • writeHexed

      public String writeHexed(Geometry geom, byte REP)
      Write a hex encoded geometry Is synchronized to protect offset counter. (Unfortunately, Java does not have neither call by reference nor multiple return values.) This is a TODO item. The geometry you put in must be consistent, geom.checkConsistency() must return true. If not, the result may be invalid WKB.
      Parameters:
      geom - the geometry to be written
      REP - endianness to write the bytes with
      Returns:
      String containing the hex encoded geometry
      See Also:

    • writeHexed

      public String writeHexed(Geometry geom)

    • writeBinary

      public byte[] writeBinary(Geometry geom, byte REP)
      Write a binary encoded geometry. Is synchronized to protect offset counter. (Unfortunately, Java does not have neither call by reference nor multiple return values.) This is a TODO item. The geometry you put in must be consistent, geom.checkConsistency() must return true. If not, the result may be invalid WKB.
      Parameters:
      geom - the geometry to be written
      REP - endianness to write the bytes with
      Returns:
      byte array containing the encoded geometry
      See Also:

    • writeBinary

      public byte[] writeBinary(Geometry geom)

    • writeGeometry

      protected void writeGeometry(Geometry geom, ValueSetter dest)
      Parse a geometry starting at offset.
      Parameters:
      geom - the geometry to write
      dest - the value setting to be used for writing

    • estimateBytes

      protected int estimateBytes(Geometry geom)
      Estimate how much bytes a geometry will need in WKB.
      Parameters:
      geom - Geometry to estimate.
      Returns:
      estimated number of bytes