Exp Class Reference

Inheritance diagram for Exp:

Collaboration diagram for Exp:

Public Member Functions
String	getURI ()
GridCoverage	modify (GridCoverage raster, Integer rd1)
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException

Member Function Documentation

evaluate()

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

inherited

                                                                                                            {
                if (args.length != 2) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 1 arguments, got " + args.length);
                }
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof RasterLiteral) {
                        GridCoverage geom=((RasterLiteral)l).read(args[0].stringValue());
                        Integer bd1=Integer.valueOf(args[1].stringValue());
                        GridCoverage result = modify(geom,bd1);
                        return valueFactory.createLiteral(((RasterLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                return null;
        }

References LiteralRegistry.getLiteral(), and RasterAlgebraUnaryFunction.modify().

Referenced by ExpTest.testExp(), InvertTest.testInvert(), and NotTest.testNot().

getURI()

String getURI

(

)

                               {
                return POSTGIS.ST_rast_algebra_exp.stringValue();
        }

References POSTGIS.ST_rast_algebra_exp.

modify()

GridCoverage modify	(	GridCoverage	raster,
		Integer	rd1
	)

Reimplemented from RasterAlgebraUnaryFunction.

                                                                    {
                ParameterBlock pbSubtracted = new ParameterBlock();
                pbSubtracted.addSource(raster.render(raster.getGridGeometry().getExtent()));
                RenderedOp subtractedImage = JAI.create("exp", pbSubtracted);
                final SampleDimension sd =raster.getSampleDimensions().get(rd1);
                List<SampleDimension>sds=new LinkedList<SampleDimension>();
                sds.add(sd);
        GridExtent extent=new GridExtent(subtractedImage.getWidth(), subtractedImage.getHeight());
        GridGeometry gridgeom=new GridGeometry(extent, PixelInCell.CELL_CENTER, raster.getGridGeometry().getGridToCRS(PixelInCell.CELL_CENTER), raster.getCoordinateReferenceSystem());
        List<SampleDimension> dimensions=new LinkedList<SampleDimension>();
        DefaultNameFactory fac=new DefaultNameFactory();
        for(int i=0;i<subtractedImage.getNumBands();i++) {
                dimensions.add(new SampleDimension(fac.createGenericName(null,  "Dimension "+i),0.,new LinkedList<Category>()));
        }
        BufferedGridCoverage coverage=new BufferedGridCoverage(
                        gridgeom, dimensions, subtractedImage.getData().getDataBuffer());
                return coverage;
        }