Package io.debezium.connector.postgresql

Class PostgisGeometry

java.lang.Object

io.debezium.connector.postgresql.PostgisGeometry

public class PostgisGeometry
extends Object

A parser API for Postgres Geometry types

Author:

Robert Coup

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	HEXEWKB_EMPTY_GEOMETRYCOLLECTION	Static Hex EKWB for a GEOMETRYCOLLECTION EMPTY.
private final Integer	srid	Coordinate reference system identifier.
private final byte[]	wkb	PostGIS Extended-Well-Known-Binary (EWKB) geometry representation.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	PostgisGeometry(byte[] ewkb, Integer srid)	Create a PostgisGeometry using the supplied EWKB and SRID.

Method Summary

Modifier and Type	Method	Description
static PostgisGeometry	createEmpty()	Create a GEOMETRYCOLLECTION EMPTY PostgisGeometry
static PostgisGeometry	fromEwkb(byte[] ewkb)	Create a PostgisGeometry using the supplied PostGIS EWKB.
static PostgisGeometry	fromHexEwkb(String hexEwkb)	Create a PostgisGeometry using the supplied PostGIS Hex EWKB string.
Integer	getSrid()	Returns the coordinate reference system identifier (SRID)
byte[]	getWkb()	Returns the standard well-known binary representation
private static Integer	parseSrid(byte[] ewkb)	Parses an EWKB Geometry and extracts the SRID (if any) https://trac.osgeo.org/postgis/browser/trunk/doc/ZMSgeoms.txt

Methods inherited from class java.lang.Object

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

Field Details

HEXEWKB_EMPTY_GEOMETRYCOLLECTION

private static final String HEXEWKB_EMPTY_GEOMETRYCOLLECTION

Static Hex EKWB for a GEOMETRYCOLLECTION EMPTY.

See Also:

• Constant Field Values

wkb

private final byte[] wkb

PostGIS Extended-Well-Known-Binary (EWKB) geometry representation. An extension of the Open Geospatial Consortium Well-Known-Binary format. Since EWKB is a superset of WKB, we use EWKB here. https://postgis.net/docs/using_postgis_dbmanagement.html#EWKB_EWKT http://www.opengeospatial.org/standards/sfa

srid

private final Integer srid

Coordinate reference system identifier. While it's technically user-defined, the standard/common values in use are the EPSG code list http://www.epsg.org/ null if unset/unspecified

Constructor Details

PostgisGeometry

private PostgisGeometry(byte[] ewkb,
 Integer srid)

Create a PostgisGeometry using the supplied EWKB and SRID.

Parameters:

ewkb - the Extended Well-Known binary representation of the coordinate in the standard format

srid - the coordinate system identifier (SRID); null if unset/unknown

Method Details

fromHexEwkb

public static PostgisGeometry fromHexEwkb(String hexEwkb)

Create a PostgisGeometry using the supplied PostGIS Hex EWKB string. SRID is extracted from the EWKB

fromEwkb

public static PostgisGeometry fromEwkb(byte[] ewkb)

Create a PostgisGeometry using the supplied PostGIS EWKB. SRID is extracted from the EWKB

createEmpty

public static PostgisGeometry createEmpty()

Create a GEOMETRYCOLLECTION EMPTY PostgisGeometry

Returns:

a PostgisGeometry which represents a PostgisGeometry API

getWkb

public byte[] getWkb()

Returns the standard well-known binary representation

Returns:

byte which represents the standard well-known binary

getSrid

public Integer getSrid()

Returns the coordinate reference system identifier (SRID)

Returns:

srid

parseSrid

private static Integer parseSrid(byte[] ewkb)

Parses an EWKB Geometry and extracts the SRID (if any) https://trac.osgeo.org/postgis/browser/trunk/doc/ZMSgeoms.txt

Parameters:

ewkb - PostGIS EWKB geometry

Returns:

Geometry SRID or null if there is no SRID.