org.postgis.java2d

Class ShapeBinaryParser

java.lang.Object

org.postgis.java2d.ShapeBinaryParser

public class ShapeBinaryParser
extends Object

Parse 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:

Markus Schaber, markus.schaber@logix-tt.com

Constructor Summary

Constructors

Constructor and Description
ShapeBinaryParser()

Method Summary

Modifier and Type	Method and Description
int	parse(byte[] value, GeneralPath path) Parse a binary encoded geometry.
int	parse(String value, GeneralPath path) Parse a hex encoded geometry Is synchronized to protect offset counter.
protected int	parseGeometry(ValueGetter data, GeneralPath path) Parse a geometry starting at offset.
static ValueGetter	valueGetterForEndian(ByteGetter bytes) Get the appropriate ValueGetter for my endianness

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ShapeBinaryParser

public ShapeBinaryParser()

Method Detail

valueGetterForEndian

public static ValueGetter valueGetterForEndian(ByteGetter bytes)

Get the appropriate ValueGetter for my endianness

Parameters:

bytes - The appropriate Byte Getter

Returns:

the ValueGetter

parse

public int parse(String value,
                 GeneralPath path)

Parse a hex encoded geometry Is synchronized to protect offset counter. (Unfortunately, Java does not have neither call by reference nor multiple return values.)

Parameters:

value - String representation of the value to be parsed

path - GeneralPath to provide the parsed value to

Returns:

a potential SRID or Geometry.UNKNOWN_SRID if not present

parse

public int parse(byte[] value,
                 GeneralPath path)

Parse a binary encoded geometry. Is synchronized to protect offset counter. (Unfortunately, Java does not have neither call by reference nor multiple return values.)

Parameters:

value - byte array representation of the value to be parsed

path - GeneralPath to provide the parsed value to

Returns:

a potential SRID or Geometry.UNKNOWN_SRID if not present

parseGeometry

protected int parseGeometry(ValueGetter data,
                            GeneralPath path)

Parse a geometry starting at offset.

Parameters:

data - ValueGetter containing the value to be parsed

path - GeneralPath to provide the parsed value to

Returns:

a potential SRID or Geometry.UNKNOWN_SRID if not present