IsPolygonCCW Class Reference

Inheritance diagram for IsPolygonCCW:

Collaboration diagram for IsPolygonCCW:

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

Member Function Documentation

attribute()

boolean attribute

(

Geometry

geom

)

                                                {
            if (geom instanceof Polygon) {
                return Orientation.isCCW(geom.getCoordinates());
            }
            return false;
        }

evaluate()

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

inherited

References GeometricBinaryAttributeFunction.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());
                        boolean result = attribute(geom);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");

        }

getURI()

String getURI

(

)

References POSTGIS.st_isPolygonCCW.

                               {
                return POSTGIS.st_isPolygonCCW.stringValue();
        }