////////////////////////////////////////////////////////////////////////
/// \class RAT::DS::MetaDB
///
/// \brief  All the meta information about the database is stored herein.
///
/// \author Phil G Jones <p.g.jones@qmul.ac.uk>
///
/// REVISION HISTORY:\n
///   2014-04-18 : P G Jones - New file. \n
///
/// \details This class stores all the relevant information about how the
/// database was setup and accessed for the processing pass.
///
////////////////////////////////////////////////////////////////////////
#ifndef __RAT_DS_MetaDB__
#define __RAT_DS_MetaDB__

#include <TObject.h>
#include <TMap.h>

#include <vector>
#include <map>

namespace RAT
{
namespace DS
{

class MetaDB : public TObject
{
public:
  MetaDB() : TObject() { }

  /// Add a override command
  ///
  /// @param[in] tableField descriptor
  /// @param[in] value to override
  void AddOverrideCommand( const std::string& tableField, const std::string& value ) { overrides.push_back( std::pair<std::string, std::string>( tableField, value ) ); }

  /// Add a loaded file's contents
  ///
  /// @param[in] file contents
  void AddFile( const std::string& file ) { files.push_back( file ); }

  /// Get a override command
  ///
  /// @param[in] index of the command to get
  /// @return pair of the tableField and value
  /// @throws out_of_range if the index is not in range
  std::pair<std::string, std::string> GetOverrideCommand( const size_t index ) const { return overrides.at( index ); }

  /// Get the number of override commands
  ///
  /// @return the total number of override commands
  size_t GetOverrideCommandCount() const { return overrides.size(); }

  /// Get a loaded file's contents
  ///
  /// @param[in] index of the file to get
  /// @return file contents
  /// @throws out_of_range if the index is not in range
  std::string GetFile( const size_t index ) const { return files.at( index ); }

  /// Get the number of loaded files
  ///
  /// @return the total number of files
  size_t GetFileCount() const { return files.size(); }

  // This ROOT macro adds dictionary methods to this class.
  // The number should be incremented whenever this class's members are changed.
  // It assumes this class has no virtual methods, use ClassDef if change this.
  ClassDefNV( MetaDB, 1 );
protected:
  std::vector< std::pair<std::string, std::string> > overrides; ///< Vector of override commands pair of table + field descriptor and value
  std::vector<std::string> files; ///< Vector of files stored as string
};

} // namespace DS

} // namespace RAT

#endif