DbTypeInfo.h

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/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id: DbTypeInfo.h 726071 2016-02-25 09:23:05Z krasznaa $
//====================================================================
//  DbTypeInfo definition
//--------------------------------------------------------------------
//
//  Package    : StorageSvc  (The POOL project)
//
//  Description: Type information for persistent objects
//
//  @author      M.Frank
//====================================================================
#ifndef POOL_DBTYPEINFO_H
#define POOL_DBTYPEINFO_H 1
 
// Framework include files
#include "DataModelRoot/RootType.h"
#include "StorageSvc/pool.h"
#include "StorageSvc/Shape.h"
#include "CxxUtils/CachedValue.h"
 
// C/C++ include files
#include <vector>
#include <atomic>
 
/*
 *  POOL namespace declaration
 */
namespace pool  {
 
  // Forward declaration
  class DbColumn;
  class DbTypeInfo;
 
  class DbTypeInfo : public Shape   {
 
  public:
    typedef RootType TypeH;
    typedef std::vector<const DbColumn*> Columns;
 
  private:
    mutable std::atomic<int> m_refCount;
    Columns     m_columns;
    int         m_mult;
    CxxUtils::CachedValue<TypeH>       m_class;
 
  protected:
    DbTypeInfo(const Guid& guid, TypeH cl, Columns& cols);
    DbTypeInfo(const Guid& guid);
 
    virtual ~DbTypeInfo();
 
    DbStatus i_fromString(const std::string& string_rep);
    static DbTypeInfo* regShape(const Guid& guid, const TypeH& type, Columns& cols);
   
  public:
    void destroy() {  delete this; }
 
    static DbTypeInfo* create(const std::string& cl_name);
    static DbTypeInfo* create(const std::string& cl_name, Columns& cols);
 
    static DbTypeInfo* create(const Guid& guid);
 
    static DbTypeInfo* create(const Guid& guid, Columns& cols);
 
    static DbTypeInfo* createEx(const Guid& guid);
 
    static DbTypeInfo* createEx(const Guid& guid, Columns& cols);
    static const DbTypeInfo* fromString(const std::string& string_rep);
    static const std::string typeName(const std::type_info& typ);
    // Requests ownership
    void addRef() const { ++m_refCount; }
    void deleteRef() const;
    TypeH clazz( bool noIdScan=false ) const;
    const Columns& columns()  const       {  return m_columns;                }
    Columns& columns()                    {  return m_columns;                }
    const std::string toString() const;
    DbStatus declareBase(const DbTypeInfo* pInfo); 
  };
}      // End namespace pool
#endif // POOL_DBTYPEINFO_H