Hi Vurfem
> The explanation on the javadoc for "contains" filter is;
>
> " contains(Expression geometry1, Expression geometry2)"
Yeeesss.... it does leave a bit to the imagination doesn't it.
(Note to self: spend a bit of time on javadocs for filter classes)
> What means expression here? May be The name of geometry of the parcel and
> the building seperately?
The filter tests if the first geometry contains the second geometry.
The first argument should be a literal expression for the geometry
attribute (almost always "the_geom").
The second argument is the actual geometry that you are testing to see
if it is contained within a given feature's geometry.
> SimpleFeature building = buildingiterator.next();
> Geometry geom = (Geometry)
> building.getDefaultGeometry();
> String filterStr = "CONTAINS(the_geom, " +(geom) + ")";
> Filter filter2 = CQL.toFilter(filterStr);
>
No, that doesn't look quite right. With CQL the second geometry has to
be expressed as a WKT string such as POINT(12 34) or LINESTRING(10 10,
20 10, 20 20). You could do it like this...
WKTWriter writer = new WKTWriter();
Geometry geom2 = ...
String cqlPredicate = "CONTAIMS(the_geom, " + writer.write(geom2) + ")";
Filter filter = CQL.toFilter(cqlPredicate);
Or you could use FilterFactory2 directly which is probably easier if
you are dealing directly with the JTS Geometry objects...
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
Geometry building = ...;
Filter filter = ff.contains(ff.literal("the_geom"),
ff.literal(building));
Hope this helps,
Michael
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