RasterAttributeIntIntIntIntFunction Class Reference

Inheritance diagram for RasterAttributeIntIntIntIntFunction:

Collaboration diagram for RasterAttributeIntIntIntIntFunction:

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

Member Function Documentation

attribute()

abstract Integer attribute ( GridCoverage  geom, Integer  noband, Integer  x, Integer  y  )

abstract

Reimplemented in PixelHeight.

Referenced by RasterAttributeIntIntIntIntFunction.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());
                        Integer result = attribute(geom,noband,x,y);
                        return valueFactory.createLiteral(result);
                }
                return null;
        }

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