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----------------------------------------------------------------------
--
--
-- Copyright (c) 2009-2010 Pierre Racine <pierre.racine@sbf.ulaval.ca>
--
----------------------------------------------------------------------
-- NOTE: The ST_DeleteBand function found in this file still need enhancement before being implemented in C.
-- NOTE: ST_DeleteBand(rast raster, band int) is dependent on
-- ST_AddBand(rast1 raster, rast2 raster, band int, index int)
-- to be found in the script/plpgsql folder
CREATE OR REPLACE FUNCTION ST_DeleteBand(rast raster,
band int)
RETURNS raster AS
$$
DECLARE
numband int := ST_NumBands(rast);
newrast raster := ST_MakeEmptyRaster(rast);
BEGIN
FOR b IN 1..numband LOOP
IF b != band THEN
newrast := ST_AddBand(newrast, rast, b, NULL);
END IF;
END LOOP;
RETURN newrast;
END;
$$
LANGUAGE 'plpgsql';
--Test
SELECT ST_MakeEmptyRaster(NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
SELECT ST_MakeEmptyRaster(ST_AddBand(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, NULL), ST_TestRaster(1, 1, 3), 1, NULL));
SELECT st_width(ST_AddBand(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, NULL), ST_TestRaster(1, 1, 3), 1, NULL));
SELECT st_width(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, NULL));
SELECT ST_NumBands(ST_AddBand(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, NULL), ST_TestRaster(1, 1, 3), 1, NULL));
SELECT ST_Value(ST_AddBand(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, 2), ST_TestRaster(1, 1, 3), 1, 3), 2, 1, 1);
SELECT ST_NumBands(ST_DeleteBand(ST_AddBand(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, 2), ST_TestRaster(1, 1, 3), 1, 2), 2));
SELECT ST_NumBands(ST_DeleteBand(ST_DeleteBand(ST_AddBand(ST_AddBand(ST_TestRaster(1, 1, 1), ST_TestRaster(1, 1, 2), 1, 2), ST_TestRaster(1, 1, 3), 1, 2), 2), 2));
SELECT ST_DeleteBand(ST_TestRaster(1, 1, 1), 2);
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