LengthToPoint Class Reference

Returns the point within the given geometry nearest to the given length. More...

Inheritance diagram for LengthToPoint:

Collaboration diagram for LengthToPoint:

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

Protected Member Functions
Geometry	relation (Geometry line, Geometry point, Integer value)

Detailed Description

Returns the point within the given geometry nearest to the given length.

Member Function Documentation

evaluate()

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

inherited

                                                                                                                    {
                        if (args.length != 3) {
                                throw new ValueExprEvaluationException(getURI() + " requires exactly 3 arguments, got " + args.length);
                        }               
                        
                        Integer value=Integer.valueOf(args[2].stringValue());
                        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());
                                Geometry transformed=LiteralUtils.transform(geom2, geom);
                                Geometry result = relation(geom,transformed,value);
                                return valueFactory.createLiteral(((VectorLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                        }
                        throw new ValueExprEvaluationException("Argument given is not a geometry literal");
                }

References LiteralRegistry.getLiteral(), GeometricDoubleModifierIntegerFunction.relation(), and LiteralUtils.transform().

Referenced by SetPointTest.testSetPoint().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_LengthToPoint.stringValue();
        }

References POSTGIS.st_LengthToPoint.

relation()

Geometry relation ( Geometry  line, Geometry  point, Integer  value  )

protected

Reimplemented from GeometricDoubleModifierIntegerFunction.

                                                                                  {
                /*org.locationtech.jump.algorithm.LengthToPoint ltop=new org.locationtech.jump.algorithm.LengthToPoint(line, point.getCoordinates()[0]);
                        GeometryWrapper transGeom2;
                        try {
                                transGeom2 = geom2.transform(geom1.getSrsInfo());
                                if(geom1.getXYGeometry().getGeometryType().equalsIgnoreCase("LineString") && 
                                                transGeom2.getXYGeometry().getGeometryType().equalsIgnoreCase("Point")) {
                                        LineString line=(LineString) geom1.getXYGeometry();
                                        Point point=(Point) transGeom2.getXYGeometry();
                                        //Double minDistance=Double.MAX_VALUE;
                                        
                                        return NodeValue.makeDouble(ltop.getLength());
                                }
                                throw new ExprEvalException("Input geometries were not a point and a linestring");
                        } catch (MismatchedDimensionException | TransformException | FactoryException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                                throw new ExprEvalException("An exception occurred: "+e.getMessage());
                        }*/
                return null;
        }