RasterAttributeIntIntIntStringFunction Class Reference

Inheritance diagram for RasterAttributeIntIntIntStringFunction:

Collaboration diagram for RasterAttributeIntIntIntStringFunction:

Public Member Functions
Value	evaluate (ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException
abstract Double	attribute (GridCoverage geom, Integer noband, Integer x, Integer y, Boolean excludenodata)

Member Function Documentation

attribute()

abstract Double attribute ( GridCoverage  geom, Integer  noband, Integer  x, Integer  y, Boolean  excludenodata  )

abstract

Referenced by RasterAttributeIntIntIntStringFunction.evaluate().

evaluate()

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

                                                                                                            {
                if (args.length != 3) {
                        throw new ValueExprEvaluationException(getURI() + " requires exactly 4 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 noband = Integer.valueOf(args[1].stringValue());
                        Integer x = Integer.valueOf(args[2].stringValue());
                        Integer y = Integer.valueOf(args[2].stringValue());
                        Boolean excludenodata = Boolean.valueOf(args[3].stringValue());
                        Double result = attribute(geom,noband,x,y,excludenodata);
                        return valueFactory.createLiteral(result);
                }
                return null;
        }

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