RunInfoProxy.h

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#ifndef CondCore_CondDB_RunInfoProxy_h
#define CondCore_CondDB_RunInfoProxy_h
//
// Package:     CondDB
// Class  :     RunInfoProxy
// 
//
// Author:      Giacomo Govi
// Created:     Dec 2016
//

#include "CondCore/CondDB/interface/Types.h"
//

namespace cond {

  namespace persistency {

    class SessionImpl;
    class RunInfoProxyData;

    // value semantics. to be used WITHIN the parent session transaction ( therefore the session should be kept alive ).
    class RunInfoProxy {
    public:
      typedef std::vector<std::tuple<Time_t,boost::posix_time::ptime,boost::posix_time::ptime> > RunInfoData;
    public:
      // more or less compliant with typical iterator semantics...   
      class Iterator  : public std::iterator<std::input_iterator_tag, cond::RunInfo_t> {
      public:
    //
    Iterator();
    explicit Iterator( RunInfoData::const_iterator current );
    Iterator( const Iterator& rhs );

    //
    Iterator& operator=( const Iterator& rhs );
    
    // returns a VALUE not a reference!
    cond::RunInfo_t operator*();

    //
    Iterator& operator++();
    Iterator operator++(int);
    
    //
    bool operator==( const Iterator& rhs ) const;
    bool operator!=( const Iterator& rhs ) const;
    
      private:
    RunInfoData::const_iterator m_current;
      };
    
    public:
      RunInfoProxy();

      //
      explicit RunInfoProxy( const std::shared_ptr<SessionImpl>& session );
      
      //
      RunInfoProxy( const RunInfoProxy& rhs );
      
      //
      RunInfoProxy& operator=( const RunInfoProxy& rhs );
      
      // loads in memory the RunInfo data for the specified run range
      void load( Time_t low, Time_t up );
      
      // loads in memory the RunInfo data for the specified run range
      void load( const boost::posix_time::ptime& low, const boost::posix_time::ptime& up );

      // clear all the iov data in memory
      void reset();
      
      // start the iteration. 
      Iterator begin() const;

      // 
      Iterator end() const;
      
      //
      Iterator find( Time_t target ) const;

      //
      Iterator find( const boost::posix_time::ptime&  target ) const;

      //
      cond::RunInfo_t get( Time_t target ) const;

      // 
      cond::RunInfo_t get( const boost::posix_time::ptime&  target ) const;

      // 
      int size() const;
      
    private:
      void checkTransaction( const std::string& ctx );
      
    private:
      std::shared_ptr<RunInfoProxyData> m_data;
      std::shared_ptr<SessionImpl> m_session;
      };

  }
}

#endif