SetStartPoint Class Reference

Sets the first point of the given geometry to the point given in the second parameter. More...

Inheritance diagram for SetStartPoint:

Collaboration diagram for SetStartPoint:

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

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

Detailed Description

Sets the first point of the given geometry to the point given in the second parameter.

Member Function Documentation

evaluate()

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

inherited

                                                                                                            {
                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 transformed=LiteralUtils.transform(geom2, geom);
                        Geometry result = relation(geom,transformed);
                        return valueFactory.createLiteral(((VectorLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                throw new ValueExprEvaluationException("Argument given is not a geometry literal");
        }

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

Referenced by AddGeometryTest.testAddGeometry(), AddGeometryTest.testAddGeometryZ(), AddPointTest.testAddPoint(), AddPointTest.testAddPointZ(), AddRingTest.testAddRing(), ClosestPointTest.testClosestPoint(), FurthestCoordinateTest.testFurthestCoordinate(), SetEndPointTest.testSetEndPoint(), and SetStartPointTest.testSetStartPoint().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_setStartPoint.stringValue();
        }

References POSTGIS.st_setStartPoint.

relation()

Geometry relation ( Geometry  geom1, Geometry  geom2  )

protected

Reimplemented from GeometricModifierFunction.

                                                                    {
        if (geom2 instanceof Point) {
            Coordinate[] coords=geom1.getCoordinates();
            Coordinate[] newcoords=coords;
            newcoords[0]=geom2.getCoordinate();
            return LiteralUtils.createGeometry(newcoords, geom1.getGeometryType(), geom1.getSRID());
        }
        return null;
        }

References LiteralUtils.createGeometry().