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DbPersistent.h

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//====================================================================
//      DbPersistent definition
//--------------------------------------------------------------------
//
//      Package    : System ( The LHCb Offline System)
//
//  Description: Definition of abstract persistent object
//
//      Author     : M.Frank
//  History    :
// +---------+----------------------------------------------+---------
// |    Date |                 Comment                      | Who     
// +---------+----------------------------------------------+---------
// | 11/07/99| Initial version                              | MF
// +---------+----------------------------------------------+---------
//====================================================================
#ifndef DBCNV_DBSVC_DBPERSISTENT_H
#define DBCNV_DBSVC_DBPERSISTENT_H 1

// Forward declarations
class StreamBuffer;
class DbLink;
class DbObject;
class DbTypeInfo;
class DbContainer;
class DbPersistent;
class DbPersistent;
template <class T> class dbHandle;
template <class T> class dbVarray;
//template <> class dbHandle<DbLink>;
//template <> class dbHandle<DbContainer>;

class DbPersistentGuard  {
  friend class DbObject;
protected:
  virtual ~DbPersistentGuard()   {
  }
public:
  virtual unsigned long addRef() const = 0;
  virtual unsigned long release() const = 0;
  virtual unsigned char type()  const = 0;
  virtual void setContainer (const dbHandle<DbContainer>& cntH) = 0;
  virtual dbHandle<DbContainer>& container() const = 0;
  virtual void setPersistent (DbPersistent* cntH) = 0;
  virtual unsigned long* oid()  const   = 0;
  virtual DbPersistent* persistent() const = 0;
  virtual void setObjectSize(long siz) = 0;
  virtual long objectSize()  const = 0;
  virtual void setSize(long siz) = 0;
  virtual long size()  const = 0;
  virtual dbVarray< dbHandle<DbLink> >& links() const = 0;
  virtual StreamBuffer& objBuffer() const = 0;
  virtual StreamBuffer& linkBuffer() const = 0;
};

class DbPersistent    {
protected:
public:
  DbPersistent();
  virtual ~DbPersistent();

  // Access proper type information
  virtual const DbTypeInfo* typeInfo() const = 0;
  virtual bool getBuffer(long start, long length, StreamBuffer& buff) = 0;
  virtual bool setBuffer(long start, long length, const StreamBuffer& buff) = 0;

  virtual void release();
  virtual bool load(DbObject* pObject);
  virtual bool save(const DbObject* pObject);
  static DbPersistentGuard* createGuard();
  static DbPersistentGuard* guard(DbObject* pObj);
  static const DbPersistentGuard* guard(const DbObject* pObj);
  static void setGuard(DbObject* pObj, DbPersistentGuard* pGuard);
  static DbPersistent* persistent(const DbObject* pObj);
  static DbObject* create(const DbTypeInfo* type, DbPersistent* persistent, const dbHandle<DbContainer>& cntH);
  static DbObject* load (DbPersistent* persistent, const dbHandle<DbContainer>& cntH);
  static void* allocate (const dbHandle<DbContainer>& nearH, const DbTypeInfo& type );
};

// We cannot include the implementation while processing the ddl file!
#if !defined(ooddl) && !defined(__CINT__)
#include "GaudiDb/DbPersistent.icpp"
#endif

#endif // DBCNV_DBSVC_DBPERSISTENT_H

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