We may be able to let the style / filter duplicating code reuse a function
instance if it cannot actually create a copy when asked?
--
Jody Garnett
On Thursday, 30 June 2011 at 12:16 AM, LSA wrote:
> Jody, thank you for answer,
>
> I am not really sure this tutorial is exactly what I need.
>
> To illustrate my problem, I cooked a small example based on
> SelectionLab.java (it has nothing to do with selection tool, I just used
> SelectionLab.java as a starting point).
>
> Here it is:
> http://files.rsdn.ru/81424/SelectionLab.java
>
> Please pay attention to createDefaultStyle() method, where otherRule is
> being created.
> static method createGeotoolsFilter is what I need. It takes interface
> implementing filtering logic (ISimpleFeatureFilter) and with it constructs
> dynamic filter (using function) which is passed to MapLayer using Rule.
> And this is what I need - to construct filter, whose filtering logic is
> implemented outside.
> In other words - I need to construct some sort of filter, which would be
> indistinguishable from ordinary geotools filter, but with custom logic inside.
>
> For the supplied example geotools throws java.lang.RuntimeException: Unable
> to find function Fooo.
>
> I would be really gratefull for reference implementation inside my
> SelectionLab.java...
>
> Thanks,
> Sergey
>
> On 29.06.2011 19:44, Jody Garnett wrote:
> > Oh I think I can help.
> >
> > We ended up copying the styles internally (to keep a copy that won't
> > change). As such the code needs to be able to call FunctionFinder with
> > "foo" and for that to work you need to register your function with the
> > system as shown here:
> > - http://docs.geotools.org/latest/userguide/tutorial/advanced/function.html
> >
> > The above is an "advanced" tutorial as it involves hooking your code into
> > geotools; all the basic tutorials just involve using geotools.
> >
> > --
> > Jody Garnett
> >
> >
> > On Wednesday, 29 June 2011 at 10:36 PM, LSA wrote:
> >
> > > Hi All,
> > >
> > > Solution offered by Michael worked flawlessly for geotools.2.6.3.
> > >
> > > However, for geotools 2.7.0, when such filter:
> > >
> > > org.opengis.filter.Filter filter = ff2.equals(foo, ff2.literal(true));
> > >
> > > passed to MapLayer in Style in Rule (mixed with some other filters using
> > > filterFactory.and())
> > >
> > > this gives the following error:
> > > java.lang.RuntimeException: Unable to find function foo
> > > at
> > > org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:103)
> > >
> > > Any ideas?
> > >
> > > Thanks,
> > > Sergey
> > >
> > > On 21.05.2010 6:32, Michael Bedward wrote:
> > > > Hi again Sergey,
> > > >
> > > > If you are only going to be using your filter programmatically (rather
> > > > than in SLD files) you can cheat a bit and set the string that you are
> > > > looking for in the filter function constructor like this...
> > > >
> > > > public class Foo extends FunctionExpressionImpl {
> > > > private final String typeName;
> > > >
> > > > public Foo(String typeName) {
> > > > super("foo");
> > > > this.typeName = typeName;
> > > > }
> > > >
> > > > @Override
> > > > public int getArgCount() {
> > > > return 0;
> > > > }
> > > >
> > > > @Override
> > > > public Object evaluate(Object feature) {
> > > > return
> > > > (((SimpleFeature)feature).getID().matches(String.format("%s\\.\\d+",
> > > > typeName)));
> > > > }
> > > > }
> > > >
> > > > Then you can use it to create a Filter like this...
> > > >
> > > > FFilterFactory2 ff2 = CommonFactoryFinder.getFilterFactory2(null);
> > > > org.opengis.filter.expression.Function foo = new Foo("some_name");
> > > > org.opengis.filter.Filter filter = ff2.equals(foo, ff2.literal(true));
> > > >
> > > > Michael
> > > >
> > >
> > >
> > >
> > > ------------------------------------------------------------------------------
> > > All of the data generated in your IT infrastructure is seriously
> > > valuable.
> > > Why? It contains a definitive record of application performance,
> > > security
> > > threats, fraudulent activity, and more. Splunk takes this data and makes
> > > sense of it. IT sense. And common sense.
> > > http://p.sf.net/sfu/splunk-d2d-c2
> > > _______________________________________________
> > > Geotools-gt2-users mailing list
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> > > (mailto:Geotools-gt2-users@lists.sourceforge.net)
> > > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
> >
>
------------------------------------------------------------------------------
All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security
threats, fraudulent activity, and more. Splunk takes this data and makes
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2d-c2
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