TCollectionProxyFactory.cxx

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// @(#)root/io:$Id: TCollectionProxyFactory.cxx 31746 2009-12-09 21:55:27Z pcanal $
// Author: Markus Frank 28/10/04

/*************************************************************************
 * 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.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TGenCollectionProxy
//
// Proxy around an arbitrary container, which implements basic
// functionality and iteration. The purpose of this implementation
// is to shield any generated dictionary implementation from the
// underlying streamer/proxy implementation and only expose
// the creation functions.
//
// In particular this is used to implement splitting and abstract
// element access of any container. Access to compiled code is necessary
// to implement the abstract iteration sequence and functionality like
// size(), clear(), resize(). resize() may be a void operation.
//
//////////////////////////////////////////////////////////////////////////

#include "TError.h"
#include "TClassEdit.h"
#include "TCollectionProxyFactory.h"
#include "TGenCollectionProxy.h"
#include "TGenCollectionStreamer.h"

#include "TEmulatedMapProxy.h"
#include "TEmulatedCollectionProxy.h"

// Do not clutter global namespace with shit....
namespace {
   static TClassEdit::ESTLType stl_type(const std::string& class_name)  {
      // return the STL type.
      int nested = 0;
      std::vector<std::string> inside;
      int num = TClassEdit::GetSplit(class_name.c_str(),inside,nested);
      if ( num > 1 )  {
         return (TClassEdit::ESTLType)TClassEdit::STLKind(inside[0].c_str());
      }
      return TClassEdit::kNotSTL;
   }

   static TEmulatedCollectionProxy* GenEmulation(const char* class_name)  {
      // Generate an emulated collection proxy.

      if ( class_name )  {
         std::string cl = class_name;
         if ( cl.find("stdext::hash_") != std::string::npos )
            cl.replace(3,10,"::");
         if ( cl.find("__gnu_cxx::hash_") != std::string::npos )
            cl.replace(0,16,"std::");
         TEmulatedCollectionProxy * result = 0;
         switch ( stl_type(cl) )  {
            case TClassEdit::kNotSTL:
               return 0;
            case TClassEdit::kMap:
            case TClassEdit::kMultiMap:
               result = new TEmulatedMapProxy(class_name);
               break;
            default:
               result = new TEmulatedCollectionProxy(class_name);
         }
         if ( result->IsValid() ) { 
            return result;
         }
      }
      return 0;
   }
}

TVirtualCollectionProxy*
TCollectionProxyFactory::GenEmulatedProxy(const char* class_name)
{
   // Generate emulated collection proxy for a given class.

   return GenEmulation(class_name);
}

TClassStreamer*
TCollectionProxyFactory::GenEmulatedClassStreamer(const char* class_name)
{
   // Generate emulated class streamer for a given collection class.

   TCollectionClassStreamer* s = new TCollectionClassStreamer();
   s->AdoptStreamer(GenEmulation(class_name));
   return s;
}

TMemberStreamer*
TCollectionProxyFactory::GenEmulatedMemberStreamer(const char* class_name)
{
   // Generate emulated member streamer for a given collection class.
   TCollectionMemberStreamer* s = new TCollectionMemberStreamer();
   s->AdoptStreamer(GenEmulation(class_name));
   return s;
}

TCollectionProxyFactory::Proxy_t*
TCollectionProxyFactory::GenExplicitProxy( const ::ROOT::TCollectionProxyInfo &info, TClass *cl)
{
   // Generate proxy from static functions.
   return new TGenCollectionProxy(info,cl);
}

TGenCollectionStreamer*
TCollectionProxyFactory::GenExplicitStreamer( const ::ROOT::TCollectionProxyInfo &info, TClass *cl )
{
   // Generate streamer from static functions.
   TGenCollectionStreamer* ptr = new TGenCollectionStreamer(info,cl);
   return ptr;
}

TClassStreamer*
TCollectionProxyFactory::GenExplicitClassStreamer( const ::ROOT::TCollectionProxyInfo &info, TClass *cl )
{
   // Generate class streamer from static functions.
   TCollectionClassStreamer* s = new TCollectionClassStreamer();
   s->AdoptStreamer(GenExplicitStreamer(info,cl));
   return s;
}

TMemberStreamer*
TCollectionProxyFactory::GenExplicitMemberStreamer( const ::ROOT::TCollectionProxyInfo &info, TClass *cl)
{
   // Generate member streamer from static functions.
   TCollectionMemberStreamer* s = new TCollectionMemberStreamer();
   s->AdoptStreamer(GenExplicitStreamer(info,cl));
   return s;
}

void TCollectionStreamer::InvalidProxyError()   {
   // Issue Error about invalid proxy.
   Fatal("TCollectionStreamer>","No proxy available. Data streaming impossible.");
}

TCollectionStreamer::TCollectionStreamer() : fStreamer(0)
{
   // Initializing constructor.
}

TCollectionStreamer::TCollectionStreamer(const TCollectionStreamer& c) : fStreamer(0)
{
   // Copy constructor.
   if ( c.fStreamer )  {
      fStreamer = dynamic_cast<TGenCollectionProxy*>(c.fStreamer->Generate());
      R__ASSERT(fStreamer != 0);
      return;
   }
   InvalidProxyError();
}

TCollectionStreamer::~TCollectionStreamer()
{
   // Standard destructor.
   if ( fStreamer )  {
      delete fStreamer;
   }
}

void TCollectionStreamer::AdoptStreamer(TGenCollectionProxy* streamer)
{
   // Attach worker proxy.
   if ( fStreamer )  {
      delete fStreamer;
   }
   fStreamer = streamer;
}

void TCollectionStreamer::Streamer(TBuffer &buff, void *pObj, int /* siz */, TClass* onFileClass )
{
   // Streamer for I/O handling.
   if ( fStreamer )  {
      TVirtualCollectionProxy::TPushPop env(fStreamer, pObj);
      fStreamer->SetOnFileClass( onFileClass );
      fStreamer->Streamer(buff);

      return;
   }
   InvalidProxyError();
}

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