Examples of org.geotools.feature.FeatureCollection.subCollection()

org.geotools.feature.FeatureCollection.subCollection()

SimpleFeatureCollection "view" indicated by provided filter.

The contents of the returned SimpleFeatureCollection are determined by applying the provider Filter to the entire contents of this FeatureCollection. The result is "live" and modifications will be shared.

This method is used cut down on the number of filter based methods required for a useful SimpleFeatureCollection construct. The FeatureCollections returned really should be considered as a temporary "view" used to control the range of a removeAll, or modify operation.

Example Use:

 collection.subCollection( filter ).clear();

The above recommended use is agreement with the Collections API precident of List.subList( start, end ).

The results of subCollection:

are to be considered unordered
may be an ordered FeatureList if requested when sortBy is indicated

@see FeatureList @param filter @return SimpleFeatureCollection identified as subset.

        // check derived collections are still read only and share the same
        // challenge policy
        SecuredFeatureCollection sorted = (SecuredFeatureCollection) rofc
                .sort(SortBy.NATURAL_ORDER);
        assertEquals(ro.policy, sorted.policy);
        SecuredFeatureCollection sub = (SecuredFeatureCollection) rofc
                .subCollection(Filter.INCLUDE);
        assertEquals(ro.policy, sorted.policy);
    }


    @Test

        // check derived collections are still read only and share the same
        // challenge policy
        SecuredFeatureCollection sorted = (SecuredFeatureCollection) rofc
                .sort(SortBy.NATURAL_ORDER);
        assertEquals(ro.policy, sorted.policy);
        SecuredFeatureCollection sub = (SecuredFeatureCollection) rofc
                .subCollection(Filter.INCLUDE);
        assertEquals(ro.policy, sorted.policy);
    }
}

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