Perimeter Class Reference

Returns the perimeter of the given geometry. More...

Inheritance diagram for Perimeter:

Collaboration diagram for Perimeter:

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

Detailed Description

Returns the perimeter of the given geometry.

Member Function Documentation

attribute()

double attribute

(

Geometry

geom

)

                                               {
                return geom.getLength();
        }

evaluate()

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

inherited

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

        }

getURI()

String getURI

(

)

References POSTGIS.st_perimeter.

                               {
                return POSTGIS.st_perimeter.stringValue();
        }