Hi Andrea,
[...]
>> cqlStr = "if_then_else(cat % 2 == 0, true, false)"
>> Filter cqlFilter = CQL.toFilter(cqlStr);
>>
>> new Fc = fc.subCollection(cqlFilter);
>
> My guess is, there is % operator in the OGC filter specification,
> so the above cannot be properly translated.
>
> I guess you have to introduce first a FilterFunction_modulus
> that computes the rest of the division and then you can
> do something like
>
> modulus(cat, 2) = 0
There is:
IEEEremainder( dividend, divisor )
which sounds like the one that can be used?
IEEEremainder( cat, 2.0 ) = 0
But I only get:
org.geotools.filter.text.cql2.CQLException: Encountered "=" at line 1,
column 27.
Was expecting one of:
<EOF>
<AND> ...
"or" ...
. Parsing : IEEEremainder( cat, 2.0 ) = 0. Current Token : ")"
...
> (no need for if_then_else)
>
> Alternatively, and without introducing a new function, this
> should work too:
>
> cat - floor((cat / 2)) * 2 = 0
Yeah, that looks nice, I tried it and:
org.geotools.filter.text.cql2.CQLException: Encountered "-" at line 1, column 5.
Was expecting one of:
"(" ...
":" ...
<IDENTIFIER> ...
"." ...
<NOT> ...
"like" ...
"is" ...
"exists" ...
"does-not-exist" ...
"before" ...
"after" ...
"during" ...
"between" ...
<EQ> ...
<GT> ...
<LT> ...
<GTE> ...
<LTE> ...
<NEQ> ...
. Parsing : cat - floor((cat / 2)) * 2 = 0. Current Token : "cat"
...
So I wonder if I am doing something odd...
Thanks,
Andrea
>
> Cheers
> Andrea
>
>
> --
> Andrea Aime
> OpenGeo - http://opengeo.org
> Expert service straight from the developers.
>
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