IsPolygonCW Class Reference

Returns true if all exterior rings are oriented clockwise and all interior rings are oriented counter-clockwise. More...

Inheritance diagram for IsPolygonCW:

Collaboration diagram for IsPolygonCW:

Public Member Functions
String	getURI ()
int	attribute (Geometry geom)
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Detailed Description

Returns true if all exterior rings are oriented clockwise and all interior rings are oriented counter-clockwise.

Member Function Documentation

attribute()

int attribute

(

Geometry

geom

)

                                            {
             if (geom instanceof Polygon) {
                 return ((Polygon) geom).getNumInteriorRing();
             }
             return 0;
        }

evaluate()

Value evaluate ( ValueFactory  valueFactory, Value...  args  ) throws ValueExprEvaluationException

inherited

References GeometricIntegerAttributeFunction.attribute(), and LiteralRegistry.getLiteral().

                                                                                                            {
                if (args.length != 1) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 1 arguments, got " + args.length);
                }

                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof VectorLiteral) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        int result = attribute(geom);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");
        }

getURI()

String getURI

(

)

References POSTGIS.st_isPolygonCW.

                               {
                return POSTGIS.st_isPolygonCW.stringValue();
        }