SharedPaths Class Reference

Inheritance diagram for SharedPaths:

Collaboration diagram for SharedPaths:

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

Protected Member Functions
Geometry	relation (Geometry geom1, Geometry geom2)

Member Function Documentation

evaluate()

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

inherited

References LiteralRegistry.getLiteral(), and GeometricRelationModifierFunction.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) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        Geometry geom2=((VectorLiteral)l2).read(args[1].stringValue());
                        Geometry result = relation(geom,geom2);
                        return valueFactory.createLiteral(((VectorLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                throw new ValueExprEvaluationException("Arguments given are not geometry literals");
        }

getURI()

String getURI

(

)

References POSTGIS.st_sharedPaths.

                               {
                return POSTGIS.st_sharedPaths.stringValue();
        }

relation()

Geometry relation ( Geometry  geom1, Geometry  geom2  )

protected

References LiteralUtils.createGeometryCollection(), and LiteralUtils.transform().

                                                                    {
        List<Geometry> intersections=new LinkedList<>();
        Geometry transformed=LiteralUtils.transform(geom2, geom1);
                if((geom1.getGeometryType().equals("MultiLineString") || geom1.getGeometryType().equals("LineString"))
                                && (transformed.getGeometryType().equals("MultiLineString") || transformed.getGeometryType().equals("LineString"))) {
                        for(int i=0;i<geom1.getNumGeometries();i++) {
                                for(int j=0;j<transformed.getNumGeometries();j++) {
                                        if(geom1.intersects(transformed.getGeometryN(j))){
                                                intersections.add(geom1.getGeometryN(i).intersection(transformed.getGeometryN(j)));
                                        }
                                }
                        }
                        return LiteralUtils.createGeometryCollection(intersections, "GEOMETRYCOLLECTION", geom1.getSRID());
                }
                return null;
        }