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DbObject.h

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//====================================================================
//      DbObject definition
//--------------------------------------------------------------------
//
//      Package    : DbCnv/DbSvc ( The LHCb Offline System)
//
//  Description: Generic persistable object
//
//      Author     : M.Frank
//  History    :
// +---------+----------------------------------------------+---------
// |    Date |                 Comment                      | Who     
// +---------+----------------------------------------------+---------
// | 11/07/99| Initial version                              | MF
// +---------+----------------------------------------------+---------
//====================================================================
#ifndef DBCNV_DBOBJECT_H
#define DBCNV_DBOBJECT_H 1

// Framework include files
#include "GaudiDb/DbOOMs.h"
// STL include files
#include <string>

// Forward declarations
class StreamBuffer;
class PersistentObject;
class DbPersistentGuard;
class DbTypeInfo;
class DbObject;
class DbLink;
template <class T>  class dbVarray;
template <class T>  class dbHandle;
template <class T>  class DbWrapper;
template <class T>  class DbFactory;

class DbObject    {
  // That's my friend, the real persistent part!
  friend DbPersistent;
  friend class DbObjectAccessor;
  friend dbHandle<DbObject>;
  friend DbWrapper<DbObject>;
  friend DbFactory<DbObject>;
protected:
  union  Internals    {
  public:
    long               m_objSize;
    DbPersistentGuard* m_guard;
  };
  mutable Internals m_internals;
  static void decreaseCounter();
  static void increaseCounter();
  static void badAssignMessage();
  unsigned char storageType()   const;
  virtual ~DbObject();
public:
  static long numInstances();
  static DbObject* create(void* buffer);
  void* operator new(size_t size, const DbTypeInfo& info);
  void* operator new(size_t size, dbHandle<DbContainer>& cntHdl, const DbTypeInfo& info);
  void* operator new(size_t size);
  void operator delete(void* ptr);
  void operator delete(void *ptr, const DbTypeInfo& info);
  void operator delete(void *ptr, dbHandle<DbContainer>& cntHdl, const DbTypeInfo& info);
  DbObject();
  long addRef();
  long release();
  virtual bool deleteObject();
  DbResult addAssocEntry(const std::string& db, const std::string& cnt, const std::string& obj, dbHandle<DbLink>& result);
  long addLink(const std::string& db, const std::string& cnt, const std::string& obj, const dbHandle<DbLink>& lnk);
  long addInvalidLink();
  // Check if object is persistent
  bool isPersistent()   const;
  long numLink()    const;
  dbVarray< dbHandle<DbLink> >& links();
  const dbVarray< dbHandle<DbLink> >& links()  const;
  StreamBuffer& streamBuffer();
  StreamBuffer& linkBuffer();
  long bufferSize() const;
  long objSize()  const;
  void setObjSize(long length);
  long linkSize()  const   {
    return bufferSize() - objSize();
  }
};

#endif  // DBCNV_DBOBJECT_H

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