ValidPixelCount Class Reference

Inheritance diagram for ValidPixelCount:

Collaboration diagram for ValidPixelCount:

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

Member Function Documentation

attribute()

Integer attribute	(	GridCoverage	raster,
		Integer	bandnum
	)

Reimplemented from RasterAttributeIntIntFunction.

                                                                      {
                RenderedImage rendered = raster.render(null);
                Integer result=0;
        for(int i=0;i<rendered.getSampleModel().getWidth();i++) {
                for(int j=0;j<rendered.getSampleModel().getHeight();j++) {                              
                        Number sample=rendered.getData().getSample(i, j, bandnum);
                        if(!raster.getSampleDimensions().get(bandnum).getNoDataValues().contains(sample)) {
                                result++;
                        }
                }
        }
        return result;
        }

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());
        if(l instanceof RasterLiteral) {
                GridCoverage geom=((RasterLiteral)l).read(args[0].stringValue());
                Integer parameter = Integer.valueOf(args[1].stringValue());
                Integer result = attribute(geom,parameter);
                return valueFactory.createLiteral(result);
        }
        return null;
}

References RasterAttributeIntIntFunction.attribute(), and LiteralRegistry.getLiteral().

Referenced by BandTest.testBand(), and BandNoDataValueTest.testBandNoDataValue().

getURI()

String getURI

(

)

                               {
                return POSTGIS.ST_validpixelcount.stringValue();
        }

References POSTGIS.ST_validpixelcount.