LineCrossingDirection Class Reference

Inheritance diagram for LineCrossingDirection:

Collaboration diagram for LineCrossingDirection:

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

Protected Member Functions
int	relation (Geometry g1, Geometry g2)

Member Function Documentation

evaluate()

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

inherited

                                                                                                            {
                if (args.length != 2) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 2 arguments, got " + args.length);
                }
 
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                LiteralType l2=LiteralRegistry.getLiteral(((Literal)args[1]).getDatatype().toString());
                if(l instanceof VectorLiteral && l2 instanceof VectorLiteral) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        Geometry geom2=((VectorLiteral)l2).read(args[1].stringValue());
                        Geometry transformed=LiteralUtils.transform(geom2, geom);
                        double result = relation(geom,transformed);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Arguments given are not a geometry literal");
 
        }

References LiteralRegistry.getLiteral(), GeometricRelationIntegerFunction.relation(), and LiteralUtils.transform().

Referenced by IsMorePreciseTest.testIsMorePreciseEqual(), IsMorePreciseTest.testIsMorePreciseFirst(), and IsMorePreciseTest.testIsMorePreciseSecond().

getURI()

String getURI

(

)

                                       {
                        return POSTGIS.st_lineCrossingDirection.stringValue();
                }

References POSTGIS.st_lineCrossingDirection.

relation()

int relation ( Geometry  g1, Geometry  g2  )

protected

Reimplemented from GeometricRelationIntegerFunction.

                                                                 {
                        if(!g1.intersects(g2)) {
                                return 0;
                        }
                        return -4;
                }