GeoHashDatatype Class Reference

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:

Collaboration diagram for GeoHashDatatype:

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.GeoHash
	The default WKT type URI. More...
static final GeoHashDatatype	INSTANCE = new GeoHashDatatype()
	A static instance of WKTDatatype. More...

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

)

References LiteralUtils.createGeometry().

                                                 {
        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);                              
    }

toString()

String toString

(

)

                             {
        return "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.

Referenced by AsGeoHash.operation().

                                          {
        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);
        }
    }

Member Data Documentation

INSTANCE

final GeoHashDatatype INSTANCE = new GeoHashDatatype()

static

A static instance of WKTDatatype.

Referenced by AsGeoHash.operation().

URI

final String URI = POSTGIS.GeoHash

static

The default WKT type URI.