Andrea, thanks for reply, I see your point, but how one can pass outside implementation in such a function? As far as I know, if you register function in
META-INF/services/org.opengis.filter.expression.Function then it will be constructed using the default constructor. If you will look at http://files.rsdn.ru/81424/SelectionLab.java, line 275, you will notice, that I am using external implementation of my filter logic (passed as interface in constructor). Do you have any idea how to workaround this limitation? Thanks, Sergey On 30.06.2011 13:40, Andrea Aime wrote: > On Thu, Jun 30, 2011 at 3:54 AM, Michael Bedward > <michael.bedw...@gmail.com> wrote: > >> On 30 June 2011 00:36, Jody Garnett<jody.garn...@gmail.com> wrote: >> >>> Micheal I think we will need to mark selection lab as broken and open a bug >>> report on this one; personally I would make a new Filter each time the >>> selection changes (it is how I handle it in uDig). But that is just me ... >>> >> Hi Jody, Sergey, >> >> I've been trying to follow this thread but must admit I'm lost. I'm >> not familiar (= clueless) about the change to the way that styles are >> handled, but if it means that filter functions can no longer be >> created and used on the fly programmatically it seems that we've made >> life harder for users (?). >> > Style cloning has been there for a while for a variety of reasons > (dpi, uom, simplify), > if a function is not registered in SPI it won't be cloneable, won't be > usable from > CQL, SLD and so on. > > The tutorial at > http://docs.geotools.org/latest/userguide/tutorial/advanced/function.html > is way overkill though, in order to add a function all one has to do > is to create > the function implementation and register it in > META-INF/services/org.opengis.filter.expression.Function > and GeoTools will pick it up and make it cloneable. > > Now, if the results of the function are not stable (calling it twice > in a row with > the same parameters does not lead to the same result) then it also has to > implement the VolatileFunction marker interface, but there are very few > functions that need to do that > > Cheers > Andrea > > > ------------------------------------------------------------------------------ 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 Geotools-gt2-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
