LineMerge Class Reference

Inheritance diagram for LineMerge:

Collaboration diagram for LineMerge:

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

Protected Member Functions
Geometry	operation (Geometry geom)

Member Function Documentation

evaluate()

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

inherited

References LiteralRegistry.getLiteral(), and GeometricUnaryFunction.operation().

                                                                                                            {
                if (args.length != 2) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 2 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());
                        Geometry result = operation(geom);
                        return valueFactory.createLiteral(((VectorLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");
        }

getURI()

String getURI

(

)

References POSTGIS.st_lineMerge.

                               {
                return POSTGIS.st_lineMerge.stringValue();
        }

operation()

Geometry operation ( Geometry  geom )

protected

References LiteralUtils.createGeometry().

                                                    {
         if (geom instanceof MultiLineString) {
                List<Coordinate> resultcoords=new LinkedList<Coordinate>();
                for(int i=0;i<((MultiLineString) geom).getLength();i++) {
                        resultcoords.addAll(Arrays.asList(((MultiLineString) geom).getGeometryN(i).getCoordinates()));
                }
                return LiteralUtils.createGeometry(resultcoords.toArray(new Coordinate[0]), "LINESTRING",geom.getSRID());
         }
         return null;
        }