CollectionExtract Class Reference

Inheritance diagram for CollectionExtract:

Collaboration diagram for CollectionExtract:

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

Protected Member Functions
Geometry	relation (Geometry geom, Integer type)

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);
                }               
                
                Integer value=Integer.valueOf(args[1].stringValue());
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof VectorLiteral) {
                        Geometry geom=((VectorLiteral)l).read(args[0].stringValue());
                        Geometry result = relation(geom,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(), and GeometricModifierIntegerFunction.relation().

Referenced by CollectionExtractTest.testCollectionExtract(), GeneratePointsTest.testGeneratePoints(), PointNTest.testLineString(), PrecisionReducerTest.testPrecisionReducer(), RemovePointTest.testRemovePoint(), RemovePointTest.testRemovePointZ(), RemoveRingTest.testRemoveRing(), and ReverseRingTest.testReverseRing().

getURI()

String getURI

(

)

                               {
                return POSTGIS.st_collectionextract.stringValue();
        }

References POSTGIS.st_collectionextract.

relation()

Geometry relation ( Geometry  geom, Integer  type  )

protected

Reimplemented from GeometricModifierIntegerFunction.

                                                                 {
            GeometryFactory fac=new GeometryFactory();
        GeometryCollection collection=(GeometryCollection)geom;
        switch(type) {
        case 1:
                List<Coordinate> coords=new ArrayList<Coordinate>();
                for(int i=0;i<collection.getNumGeometries();i++) {
                        for(Coordinate coord2:collection.getGeometryN(i).getCoordinates()) {
                                coords.add(coord2);
                        }
                }
                if(coords.size()==1) {
                        return fac.createPoint(coords.get(0));
                }
                return fac.createMultiPointFromCoords(coords.toArray(new Coordinate[0]));
        case 2:
                List<LineString> lines=new ArrayList<LineString>();
                for(int i=0;i<collection.getNumGeometries();i++) {
                                lines.add((LineString)collection.getGeometryN(i));
                }
                return fac.createMultiLineString(lines.toArray(new LineString[0]));
        case 3: 
                List<Polygon> polys=new ArrayList<Polygon>();
                for(int i=0;i<collection.getNumGeometries();i++) {
                                polys.add((Polygon)collection.getGeometryN(i));
                }
                return fac.createMultiPolygon(polys.toArray(new Polygon[0]));
        }
        return null;
        }