    // @(#)root/tree:$Name:  $:$Id: TLeafObject.cxx,v 1.15 2004/01/10 10:52:30 brun Exp $
    // Author: Rene Brun   27/01/96

    /*************************************************************************
     * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
     * All rights reserved.                                                  *
     *                                                                       *
     * For the licensing terms see $ROOTSYS/LICENSE.                         *
     * For the list of contributors see $ROOTSYS/README/CREDITS.             *
     *************************************************************************/

    //////////////////////////////////////////////////////////////////////////
    //                                                                      //
    // A TLeaf for a general object derived from TObject.                   //
    //////////////////////////////////////////////////////////////////////////

    #include "TROOT.h"
    #include "TLeafObject.h"
    #include "TBranch.h"
    #include "TClass.h"
    #include "TMethodCall.h"
    #include "TDataType.h"

    ClassImp(TLeafObject)

    //______________________________________________________________________________
     TLeafObject::TLeafObject(): TLeaf()
    {
    //*-*-*-*-*-*Default constructor for LeafObject*-*-*-*-*-*-*-*-*-*-*-*-*-*
    //*-*        =================================
       fClass      = 0;
       fObjAddress = 0;
       fVirtual    = kTRUE;
    }

    //______________________________________________________________________________
     TLeafObject::TLeafObject(const char *name, const char *type)
           :TLeaf(name,type)
    {
    //*-*-*-*-*-*-*-*-*-*-*-*-*Create a LeafObject*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
    //*-*                      ==================
    //*-*

      SetTitle(type);
      fClass      = gROOT->GetClass(type);
      fObjAddress = 0;
      fVirtual    = kTRUE;
    }

    //______________________________________________________________________________
     TLeafObject::~TLeafObject()
    {
    //*-*-*-*-*-*Default destructor for a LeafObject*-*-*-*-*-*-*-*-*-*-*-*
    //*-*        ==================================

    }

    //______________________________________________________________________________
     void TLeafObject::FillBasket(TBuffer &b)
    {
    //*-*-*-*-*-*-*-*-*-*-*Pack leaf elements in Basket output buffer*-*-*-*-*-*-*
    //*-*                  =========================================

       if (!fObjAddress) return;
       TObject *object  = GetObject();
       if (object) {
          if (fVirtual) {
             UChar_t n = strlen(object->ClassName());
             b << n;
             b.WriteFastArray(object->ClassName(),n+1);
          }
          object->Streamer(b);
       } else {
         if (fClass) {
            if (fClass->Property() & kIsAbstract) object = new TObject;
            else                                  object = (TObject *)fClass->New();
            object->SetBit(kInvalidObject);
            object->SetUniqueID(123456789);
            object->Streamer(b);
            if (fClass->Property() & kIsAbstract) delete object;
            else                                  fClass->Destructor(object);
         } else {
            Error("FillBasket","Attempt to write a NULL object in leaf:%s",GetName());
         }
       }
    }

    //______________________________________________________________________________
     TMethodCall *TLeafObject::GetMethodCall(const char *name)
    {
    //*-*-*-*-*-*-*-*Returns pointer to method corresponding to name*-*-*-*-*-*-*
    //*-*            ============================================
    //*-*
    //*-*    name is a string with the general form  "method(list of params)"
    //*-*   If list of params is omitted, () is assumed;
    //*-*

       char *namecpy = new char[strlen(name)+1];
       strcpy(namecpy,name);
       char *params = strchr(namecpy,'(');
       if (params) { *params = 0; params++; }
       else params = (char *) ")";

       if (!fClass) fClass      = gROOT->GetClass(GetTitle());
       TMethodCall *m = new TMethodCall(fClass, namecpy, params);
       delete [] namecpy;
       if (m->GetMethod()) return m;
       Error("GetMethodCall","Unknown method:%s",name);
       delete m;
       return 0;
    }

    //______________________________________________________________________________
     const char *TLeafObject::GetTypeName() const
    {
    //*-*-*-*-*-*-*-*Returns name of leaf type*-*-*-*-*-*-*-*-*-*-*-*
    //*-*            =========================

       return fTitle.Data();
    }

    //______________________________________________________________________________
     Bool_t TLeafObject::Notify()
    {
       // This method must be overridden to handle object notifcation.

       fClass      = gROOT->GetClass(GetTitle());
       return kFALSE;
    }

    //______________________________________________________________________________
     void TLeafObject::PrintValue(Int_t) const
    {
    // Prints leaf value

       printf("%lxn",(Long_t)GetValuePointer());
    }

    //______________________________________________________________________________
     void TLeafObject::ReadBasket(TBuffer &b)
    {
    //*-*-*-*-*-*-*-*-*-*-*Read leaf elements from Basket input buffer*-*-*-*-*-*
    //*-*                  ===========================================

       char classname[128];
       UChar_t n;
       if (fVirtual) {
          b >> n;
          b.ReadFastArray(classname,n+1);
          fClass      = gROOT->GetClass(classname);
       }
       if (fClass) {
          TObject *object;
          if (!fObjAddress) {
             Long_t *voidobj = new Long_t[1];
             fObjAddress  = (void **)voidobj;
             *fObjAddress = (TObject *)fClass->New();
          }
          object = (TObject*)(*fObjAddress);
          if (fBranch->IsAutoDelete()) {
             fClass->Destructor(object);
             object = (TObject *)fClass->New();
          }
          if (!object) return;

          if (fClass->GetClassInfo()) {
             object->Streamer(b);
          } else {
             //emulated class has no Streamer
             if (!TestBit(kWarn)) {
                Warning("ReadBasket","%s::Streamer not available, using TClass::ReadBuffer instead",fClass->GetName());
                SetBit(kWarn);
             }
             fClass->ReadBuffer(b,object);
          }
          // in case we had written a null pointer a Zombie object was created
          // we must delete it
          if (object->TestBit(kInvalidObject)) {
             if (object->GetUniqueID() == 123456789) {
                fClass->Destructor(object);
                object = 0;
             }
          }
          *fObjAddress = object;
       } else GetBranch()->SetAddress(0);
    }

    //______________________________________________________________________________
     void TLeafObject::SetAddress(void *add)
    {
    //*-*-*-*-*-*-*-*-*-*-*Set leaf buffer data address*-*-*-*-*-*
    //*-*                  ============================

       fObjAddress = (void **)add;
    }

    //______________________________________________________________________________
     void TLeafObject::Streamer(TBuffer &b)
    {
       // Stream an object of class TLeafObject.

       if (b.IsReading()) {
          UInt_t R__s, R__c;
          Version_t R__v = b.ReadVersion(&R__s, &R__c);
          if (R__v > 3 || R__v == 2) {
             TLeafObject::Class()->ReadBuffer(b, this, R__v, R__s, R__c);
             if (R__v == 2) fVirtual = kTRUE;
             fObjAddress = 0;
             fClass  = gROOT->GetClass(fTitle.Data());
             if (!fClass) Warning("Streamer","Cannot find class:%s",fTitle.Data());
             return;
          }
          //====process old versions before automatic schema evolution
          TLeaf::Streamer(b);
          fObjAddress = 0;
          fClass  = gROOT->GetClass(fTitle.Data());
          if (!fClass) Warning("Streamer","Cannot find class:%s",fTitle.Data());
          if (R__v  < 1) fVirtual = kFALSE;
          if (R__v == 1) fVirtual = kTRUE;
          if (R__v == 3) b >> fVirtual;
          //====end of old versions

       } else {
          TLeafObject::Class()->WriteBuffer(b,this);
       }
    }