OrConst Class Reference

Inheritance diagram for OrConst:

Collaboration diagram for OrConst:

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

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);
                }
                LiteralType l=LiteralRegistry.getLiteral(((Literal)args[0]).getDatatype().toString());
                if(l instanceof RasterLiteral) {
                        GridCoverage geom=((RasterLiteral)l).read(args[0].stringValue());
                        Integer band=Integer.valueOf(args[1].stringValue());
                        Double constt=Double.valueOf(args[2].stringValue());
                        GridCoverage result = modify(geom,band,constt);
                        return valueFactory.createLiteral(((RasterLiteral) l).unparse(result),((Literal)args[0]).getDatatype());
                }
                return null;
        }

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

Referenced by AddConstTest.testAddConst(), AndConstTest.testAndConst(), DivConstTest.testDivConst(), MultConstTest.testMultConst(), OrConstTest.testOrConst(), SubtractConstTest.testSubtractConst(), and XorConstTest.testXorConst().

getURI()

String getURI

(

)

                               {
                return POSTGIS.ST_rast_algebra_orconst.stringValue();
        }

References POSTGIS.ST_rast_algebra_orconst.

modify()

GridCoverage modify	(	GridCoverage	raster,
		Integer	rd1,
		Double	constt
	)

Reimplemented from RasterAlgebraConstFunction.

                                                                                  {
                ParameterBlock pbSubtracted = new ParameterBlock();
                pbSubtracted.addSource(raster.render(raster.getGridGeometry().getExtent()));
                double[] consts=new double[raster.getSampleDimensions().size()];
                if(rd1.intValue()<0) {
                        for(int i=0;i<consts.length;i++) {
                                consts[i]=constt;
                        }
                }else {
                        for(int i=0;i<consts.length;i++) {
                                if(i==rd1.intValue()) {
                                        consts[i]=constt;
                                }else {
                                        consts[i]=0;
                                }
                        }
                }
                pbSubtracted.add(consts);
                RenderedOp subtractedImage = JAI.create("orconst", pbSubtracted);
                final SampleDimension sd = new SampleDimension.Builder().setName("t")
                                .addQuantitative(
                                                (raster.getSampleDimensions().get(rd1).getName() + " orconst "
                                                                + constt).toString(),
                                                raster.getSampleDimensions().get(rd1).getMeasurementRange().get(),
                                                raster.getSampleDimensions().get(rd1).getTransferFunction().get(),
                                                raster.getSampleDimensions().get(rd1).getUnits().get())
                                .build();
                
                List<SampleDimension>sds=new LinkedList<SampleDimension>();
                sds.add(sd);
                /*
                 * Create the grid coverage, gets its image and set values directly as short
                 * integers.
                 */
                BufferedGridCoverage coverage = new BufferedGridCoverage(raster.getGridGeometry(),
                                sds, DataBuffer.TYPE_SHORT);
                WritableRaster rasterr = ((BufferedImage) coverage.render(null)).getRaster();
                rasterr.setRect(subtractedImage.getSourceImage(0).getData());
                return coverage;
        }