MaxDistance Class Reference

Inheritance diagram for MaxDistance:

Collaboration diagram for MaxDistance:

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

Protected Member Functions
double	relation (Geometry geom1, Geometry geom2)

Member Function Documentation

evaluate()

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

inherited

References LiteralRegistry.getLiteral(), and GeometricRelationDoubleFunction.relation().

                                                                                                            {
                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)l).read(args[1].stringValue());
                        double result = relation(geom,geom2);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Arguments given are not a geometry literal");

        }

getURI()

String getURI

(

)

References POSTGIS.st_maxDistance.

                               {
                return POSTGIS.st_maxDistance.stringValue();
        }

relation()

double relation ( Geometry  geom1, Geometry  geom2  )

protected

References LiteralUtils.transform().

                                                                  {
                Double maxDistance=0.;
                Geometry transformed=LiteralUtils.transform(geom2, geom1);
                        for(Coordinate coord:geom1.getCoordinates()) {
                                for(Coordinate coord2:transformed.getCoordinates()) {
                                        Double curdistance=coord.distance(coord2);
                                        if(curdistance>maxDistance) {
                                                maxDistance=curdistance;
                                        }
                                }
                        }
                        return maxDistance;
        }