BBOXOverlapsBelow Class Reference

Inheritance diagram for BBOXOverlapsBelow:

Collaboration diagram for BBOXOverlapsBelow:

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

Protected Member Functions
boolean	relation (Geometry geom, Geometry g2)

Member Function Documentation

evaluate()

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

inherited

References LiteralRegistry.getLiteral(), and GeometricRelationBinaryFunction.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)l2).read(args[1].stringValue());
                        boolean result = relation(geom,geom2);
                        return valueFactory.createLiteral(result);
                }
                throw new ValueExprEvaluationException("Arguments given are not a geometry literal");
                
        }

getURI()

String getURI

(

)

References POSTGIS.st_bboxoverlapsbelow.

                               {
                return POSTGIS.st_bboxoverlapsbelow.stringValue();
        }

relation()

boolean relation ( Geometry  geom, Geometry  g2  )

protected

References LiteralUtils.transform().

                                                               {
                Geometry transformed=LiteralUtils.transform(g2, geom);
                if(geom.getEnvelope().overlaps(transformed.getEnvelope())) {
                        return true;
                }
                if(geom.getEnvelopeInternal().getMaxY()<transformed.getEnvelopeInternal().getMinY()) {
                        return true;
                }
                return false;
        }