TKeyMapFile.cxx

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// @(#)root/io:$Id$
// Author: Rene Brun   23/07/97

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

/**
\class TKeyMapFile
\ingroup IO
 Utility class for browsing TMapFile objects.

 When the browser is invoked for a TMapFile, a TKeyMapFile object
 is created for each object in the mapped file.
 When a TKeyMapFile object is clicked in the browser, a new copy
 of this object is copied into the local directory and the action
 corresponding to object->Browse is executed (typically Draw).
*/

#include "TKeyMapFile.h"
#include "TDirectory.h"
#include "TMapFile.h"
#include "TBrowser.h"

ClassImp(TKeyMapFile);

////////////////////////////////////////////////////////////////////////////////
/// Default constructor.

TKeyMapFile::TKeyMapFile() : TNamed(), fMapFile(0)
{
}

////////////////////////////////////////////////////////////////////////////////
/// Constructor.

TKeyMapFile::TKeyMapFile(const char *name, const char *classname, TMapFile *mapfile)
      : TNamed(name,classname)
{
   fMapFile = mapfile;
}

////////////////////////////////////////////////////////////////////////////////
/// Browse the contained objects.

void TKeyMapFile::Browse(TBrowser *b)
{
   TObject *obj = gDirectory->Get((char*)GetName());
   delete obj;
   obj = fMapFile->Get(GetName(),0);

   if( b && obj )
      obj->Browse( b );
}