Howdy Peter.
Say you do the following addition in your the source code of
BrOutputTreeElement::Event(BrEventNode* event):
TClass* cl = gROOT->GetClass(fClassName);
TObject*o = arr->New(iE);
TBuffer b(TBuffer::kWrite);
TObject * obj = table->At(iE);
// Cast obj to baseclass fBaseClassName if specified
if (!fClassName.IsNull() && cl->InheritsFrom(fClassName)
obj = cl->DynamicCast(gROOT->GetClass(fBaseClassName), obj, kTRUE);
obj->Streamer(b);
b.SetReadMode();
b.SetBufferOffset();
o->Streamer(b);
Also you should modify the BrOutputTreeModule::AddElement(...) functions
to something like
virtual void AddElement(const Char_t* className, const Char_t* name,
const Char_t* branchName, const Char_t* baseClassName = NULL, Bool_t
isTable = kFALSE, Int_t arrSize = 100, Int_t bufSize = 32000, Int_t
splitLevel = 99)
virtual void AddElement(const Char_t* className, const Char_t* name,
const Char_t* baseClassName = NULL, Bool_t isTable = kFALSE, Int_t
arrSize = 100, Int_t bufSize = 32000, Int_t splitLevel = 99)
to allow you to specify the base class of an object in a member TString
fBaseClassName.
I'm not sure it works, but it could be worth a try. Also I may have
misunderstood the use of TClass::DynamicCast(...), so you're hereby
warned. :)
JI
Peter H. L. Christiansen wrote:
> Hi
>
> Kris and I noticed that with the new BrOutputTreeModule it is not possible
> to "downcast" things in a tree.
>
> The actual problem is that I want to add the table that contains
> BrTpcTrackCandidates ( : BrTrackCandidate : BrTrack : ....) to a tree
> branch as BrTrack(s) since I don't need the residuals. In the old code I
> believe this used to work, but now it doesn't i.e., adding a table of
> BrTracks(s) gives some Streamer/class version conflicts, while adding the
> full BrTpcTrackCandidate works. I believe this has to do with the part in
> the event method that reads :
>
> TClass* cl = gROOT->GetClass(fClassName);
> TObject*o = arr->New(iE);
> TBuffer b(TBuffer::kWrite);
> TObject * obj = table->At(iE);
> obj->Streamer(b);
> b.SetReadMode();
> b.SetBufferOffset();
> o->Streamer(b);
>
> PC comments :
> What is cl used for ?
> ie is the index looping over the datatable
> arr is a TClonesArray of here BrTracks(s)
> obj is of type BrTpcTrackCandidate here
>
> So somehow I need to tell either obj or o when I stream that I want a
> BrTrack instead of the full monty. Does anybody know a fix for this ?
>
> The lazy way is to use the old, but as FV notes it is 100 times slower!
> Or I could just copy everything, but that increases my filesize.
>
> Cheers
> Peter
>
--
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