IsSquare Class Reference

Inheritance diagram for IsSquare:

Collaboration diagram for IsSquare:

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

Member Function Documentation

attribute()

boolean attribute

(

Geometry

geom

)

                                                {
                if(geom.isRectangle()) {
                        Double distance01=geom.getCoordinates()[0].distance(geom.getCoordinates()[1]);
                        Double distance12=geom.getCoordinates()[1].distance(geom.getCoordinates()[2]);
                        Double distance23=geom.getCoordinates()[2].distance(geom.getCoordinates()[3]);
                        Double distance34=geom.getCoordinates()[3].distance(geom.getCoordinates()[0]);
                        if(distance01==distance23 && distance12==distance34 && distance01==distance12 && distance23==distance34)
                                return true;
                }
                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

(

)

                               {
                return POSTGIS.st_isSquare.stringValue();
        }