Hi all,
Still exploring the Geotools CQL parser, I wonder if it would be
interesting to support alias for expression.
I think of something like this
Expression expr = ECQL.toExpression("X + 1 as newField");
This would allow the user to specify in the text expression the name of
the expected column.
Geotools could then easily convert this into a list of definitions that
would be passed to the TransformFactory (transform method).
We can imagine a simplification of the method like this :
Expression expr = ECQL.toExpression("X + 1 as newField")
FeatureSource newFs = TransformFactory.transform(fs, fs.getName(), exp)
or
Expression[] exprs = ECQL.toExpressions("X + 1 as newField,
area(the_geom)/1000 as area")
FeatureSource newFs = TransformFactory.transform(fs, fs.getName(), exps)
or
FeatureSource newFs = TransformFactory.transform(fs, fs.getName(), "X +
1 as newField, area(the_geom)/1000 as area")
Does this make sense?
Erwan
--
Ingénieur de Recherche CNRS - HDR,
Laboratoire Lab-STICC – UMR 6285
Equipe DECIDE
Institut Universitaire de Technologie de Vannes
8, Rue Montaigne - BP 561 56017 Vannes Cedex
T: +33 2 97 62 64 92
W: https://cv.archives-ouvertes.fr/erwan-bocher
W: http://www.labsticc.fr
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