WKTDatatype class allows the URI "geo:wktLiteral" to be used as a datatype and it will parse that datatype to a JTS Geometry. More...

Inheritance diagram for GeoHashDatatype:

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Collaboration diagram for GeoHashDatatype:

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Public Member Functions
String	unparse (Geometry geom1)
	This method Un-parses the JTS Geometry to the WKT literal. More...

Geometry	read (String geometryLiteral)

String	toString ()

Static Public Attributes
static final String	URI = POSTGIS.NAMESPACE+POSTGIS.GeoHash
	The default WKT type URI. More...

static final GeoHashDatatype	INSTANCE = new GeoHashDatatype()
	A static instance of WKTDatatype. More...

static final IRI	LiteralIRI =SimpleValueFactory.getInstance().createIRI(POSTGIS.NAMESPACE+POSTGIS.GeoHash)

Detailed Description

WKTDatatype class allows the URI "geo:wktLiteral" to be used as a datatype and it will parse that datatype to a JTS Geometry.

Req 10 All RDFS Literals of type geo:wktLiteral shall consist of an optional URI identifying the coordinate reference system followed by Simple Features Well Known Text (WKT) describing a geometric value. Valid geo:wktLiterals are formed by concatenating a valid, absolute URI as defined in [RFC 2396], one or more spaces (Unicode U+0020 character) as a separator, and a WKT string as defined in Simple Features [ISO 19125-1].

Req 11 The URI

<http://www.opengis.net/def/crs/OGC/1.3/CRS84>

shall be assumed as the spatial reference system for geo:wktLiterals that do not * specify an explicit spatial reference system URI.

Member Function Documentation

◆ read()

Geometry read ( String geometryLiteral )

Reimplemented from VectorLiteral.

                                                  {
         GeoHash hash=GeoHash.fromGeohashString(geometryLiteral);
         Coordinate coord=new Coordinate(hash.getOriginatingPoint().getLatitude(), hash.getOriginatingPoint().getLongitude());
         List<Coordinate> coords=new LinkedList<Coordinate>();
         coords.add(coord);
         return LiteralUtils.createGeometry(coords, "Point", 4326);                              
     }

References LiteralUtils.createGeometry().

◆ toString()

String toString ( )

                              {
         return "GeoHashDatatype{" + URI + '}';
     }

References GeoHashDatatype.URI.

◆ unparse()

String unparse ( Geometry geom1 )

This method Un-parses the JTS Geometry to the WKT literal.

Parameters

geometry - the JTS Geometry to be un-parsed

Returns: WKT - the returned WKT Literal.
Notice that the Spatial Reference System is not specified in returned WKT literal.

Reimplemented from VectorLiteral.

                                           {
         if(geom1.getGeometryType().equalsIgnoreCase("Point")) {
                 return GeoHash.geoHashStringWithCharacterPrecision(geom1.getCoordinate().getY(), geom1.getCoordinate().getX(), 32);
         }else {
                 return GeoHash.geoHashStringWithCharacterPrecision(geom1.getCentroid().getCoordinate().getY(), geom1.getCentroid().getCoordinate().getX(), 32);
         }
     }