PayloadFile.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
 
#include <framework/database/DBObjPtr.h>
#include <string>
 
 
namespace Belle2 {
  class PayloadFile {
  public:
    explicit PayloadFile(const std::string& fileName): m_fileName(fileName) {};
 
    std::string getFileName() const {return m_fileName;};
 
    std::string getContent() const;
 
  private:
    std::string m_fileName; 
  };
 
  template<> class DBObjPtr<PayloadFile>: public DBAccessorBase {
  public:
    explicit DBObjPtr(const std::string& name = "", bool required = true):
      DBAccessorBase(DBStoreEntry::c_RawFile, name, required), m_payloadFile(isValid() ? m_entry->getFilename() : "")
    {
      // if the payload changes also change the filename
      addCallback([this](const std::string&) {m_payloadFile = PayloadFile(isValid() ? m_entry->getFilename() : "");});
    }
    inline bool isValid() const {return (m_entry) && (m_entry->getFilename() != "");}
    inline const PayloadFile& operator *()  const {return m_payloadFile; }  
    inline const PayloadFile* operator ->() const {return &m_payloadFile; }   
  private:
    PayloadFile m_payloadFile;
  };
}