AlgFactory.h

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// $Id: AlgFactory.h,v 1.14 2003/05/16 01:26:38 gmieg Exp $
//
// AlgFactory.h
//
// AlgFactory creates Algorithm objects derived from AlgBase.
//
// Author:  G. Irwin 2/2000

#ifndef ALGFACTORY_H
#define ALGFACTORY_H

#include "TList.h"

#include "Algorithm/AlgHandle.h"

class AlgBase;
class AlgConfig;
class AlgHandle;
class ConfigRecord;
class VldContext;

class AlgFactory
{

public:
   static AlgFactory &GetInstance();

   AlgHandle GetAlgHandle(const char *algnm, const char *cnfnm);
   ConfigRecord *GetOwnedConfigRecord(const VldContext *vld);
   void Register(const char *algnm,     const char *cnfnm,
                 const char *libnm = 0, const char *cclnm = 0);

private:
   static AlgFactory *fsTheInstance;
   TList fAlgHandleList;
   Bool_t fConfigRecordIsModified;

   AlgFactory();
   virtual ~AlgFactory();

// These methods are private and not implemented to prevent copying.
   AlgFactory(const AlgFactory &);
   void operator=(const AlgFactory &);

// This section sets up the singleton machinery.
// Cleaner struct used to clean up singleton at end of job
   struct Cleaner {
     void UseMe() { }                  // Dummy method to quiet compiler
    ~Cleaner() {
       if (AlgFactory::fsTheInstance != 0) {
         delete AlgFactory::fsTheInstance;
         AlgFactory::fsTheInstance = 0;
   } } };

   friend struct Cleaner; 

ClassDef(AlgFactory,0) // Creates Algorithm objects derived from AlgBase

};

#endif                                                   // ALGFACTORY_H

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