MetaInfoInterfaceUtils.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2018.
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// $Maintainer: Chris Bielow $
// $Authors: Chris Bielow $
// --------------------------------------------------------------------------

#pragma once

#include <OpenMS/OpenMSConfig.h>
#include <OpenMS/DATASTRUCTURES/String.h>

#include <algorithm>
#include <map>
#include <vector>

namespace OpenMS
{

  class /*OPENMS_DLLAPI -- disabled since it's template code only */ MetaInfoInterfaceUtils
  {
public:
    


    template<typename T_In, typename T_Out>
    static T_Out findCommonMetaKeys(const typename T_In::const_iterator& it_start, const typename T_In::const_iterator& it_end, float min_frequency)
    {
      // make sure min_frequency is within [0,100]
      min_frequency = std::min((float)100.0, std::max((float)0.0, min_frequency));

      std::map<String, uint> counter;
      typedef std::vector<String> KeysType;
      KeysType keys;
      for (typename T_In::const_iterator it = it_start; it != it_end; ++it)
      {
        it->getKeys(keys);
        for (KeysType::const_iterator itk = keys.begin(); itk != keys.end(); ++itk)
        {
          ++counter[*itk];
        }
      }
      // pick the keys which occur often enough
      const uint required_counts = uint(min_frequency / 100.0 * std::distance(it_start, it_end));
      T_Out common_keys;
      for (std::map<String, uint>::const_iterator it = counter.begin(); it != counter.end(); ++it)
      {
        if (it->second >= required_counts) 
        {
          common_keys.insert(common_keys.end(), it->first);
        }
      }
      return common_keys;
    }

private:
    MetaInfoInterfaceUtils();
    MetaInfoInterfaceUtils(const MetaInfoInterfaceUtils&);
    MetaInfoInterfaceUtils& operator=(MetaInfoInterfaceUtils&);
  
  }; // class

} // namespace OPENMS