NumDistinctGeometries Class Reference

Returns the number of distinct geometries included in this geometry. More...

Inheritance diagram for NumDistinctGeometries:

Collaboration diagram for NumDistinctGeometries:

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

Detailed Description

Returns the number of distinct geometries included in this geometry.

Member Function Documentation

attribute()

int attribute

(

Geometry

geom

)

                                            {
                Set<Geometry> coordset=new HashSet<Geometry>();
                for(int i=0;i<geom.getNumGeometries();i++) {
                        coordset.add(geom.getGeometryN(i));
                }
                return coordset.size();
        }

evaluate()

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

inherited

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

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_numDistinctGeometries.stringValue();
        }