Hi,
in this mail I'm proposing we resurrect an old functinality we had at the
1.7.x times,
filtering layers by a user specified filter.
The FeatureTypeInfo filter field is indeed still there:
https://github.com/geoserver/geoserver/blob/master/src/main/src/main/java/org/geoserver/catalog/FeatureTypeInfo.java#L61
but the code around it is kind of lacking, and need some massaging and deep
testing to make
sure it actually works, since nothing in that area has been touched in
several years.
GUI wise we need a way to edit the filters, which I'm proposing is going to
be a simple text field for the moment,
that will show up below the attribute list, and which will validate
checking both syntax and proper usage of
existing attributes in the layer.
Persistence wise, we need to have XStream store the Filter (right now there
are no converters for them, which
would make for a non useful storage), which I'm proposing to store as ECQL
too.
We'll then have to verify that the filtering machinery works at the
GeoServerFeatureSource level, and that
it mixes well with user, style and security filters.
The impetus to work on this originates from simplifying and at the same
time generalizing the SORL store
usage (see related mail in GeoTools devel),
dropping the attribute based layer mapping, and replacing with a more
general CQL filter that
will also allow the same document to show up in multiple layers, but the
functionality is general and will
be useful in other cases too.
Cheers
Andrea
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Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
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