org.geotools.data.postgis

Class WKBReader

Object

WKBReader

public class WKBReader
extends Object

Reads a Geometryfrom a byte stream in Postgis Extended Well-Known Binary format. Supports use of an InStream, which allows easy use with arbitrary byte stream sources.

This class reads the format describe in WKBWriter. It also partially handles the Extended WKB format used by PostGIS, by parsing and storing SRID values and supporting . The reader repairs structurally-invalid input (specifically, LineStrings and LinearRings which contain too few points have vertices added, and non-closed rings are closed).

This class is designed to support reuse of a single instance to read multiple geometries. This class is not thread-safe; each thread should create its own instance.

See Also:

for a formal format specification

Constructor Summary

Constructors

Constructor and Description
WKBReader()
WKBReader(GeometryFactory geometryFactory)

Method Summary

Modifier and Type	Method and Description
static byte[]	hexToBytes(String hex) Converts a hexadecimal string to a byte array.
Geometry	read(byte[] bytes) Reads a single Geometry in WKB format from a byte array.
Geometry	read(InStream is) Reads a Geometry in binary WKB format from an InStream.
protected Polygon	readCurvePolygon()
protected Geometry	readGeometry()
protected Geometry	readGeometry(int geometryType)
protected Polygon	readPolygon()

Methods inherited from class Object

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

Constructor Detail

WKBReader

public WKBReader()

WKBReader

public WKBReader(GeometryFactory geometryFactory)

Method Detail

hexToBytes

public static byte[] hexToBytes(String hex)

Converts a hexadecimal string to a byte array. The hexadecimal digit symbols are case-insensitive.

Parameters:

hex - a string containing hex digits

Returns:

an array of bytes with the value of the hex string

read

public Geometry read(byte[] bytes)
              throws ParseException

Reads a single Geometry in WKB format from a byte array.

Parameters:

bytes - the byte array to read from

Returns:

the geometry read

Throws:

ParseException - if the WKB is ill-formed

read

public Geometry read(InStream is)
              throws IOException,
                     ParseException

Reads a Geometry in binary WKB format from an InStream.

Parameters:

is - the stream to read from

Returns:

the Geometry read

Throws:

IOException - if the underlying stream creates an error

ParseException - if the WKB is ill-formed

readGeometry

protected Geometry readGeometry()
                         throws IOException,
                                ParseException

Throws:

IOException

ParseException

readGeometry

protected Geometry readGeometry(int geometryType)
                         throws IOException,
                                ParseException

Throws:

IOException

ParseException

readPolygon

protected Polygon readPolygon()
                       throws IOException

Throws:

IOException

readCurvePolygon

protected Polygon readCurvePolygon()
                            throws IOException,
                                   ParseException

Throws:

IOException

ParseException