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 2002-2021.
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//    may be used to endorse or promote products derived from this software
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// $Maintainer: Chris Bielow $
// $Authors: Chris Bielow $
// --------------------------------------------------------------------------
 
#pragma once
 
#include <OpenMS/OpenMSConfig.h>
#include <OpenMS/DATASTRUCTURES/String.h>
#include <OpenMS/METADATA/MetaInfoInterface.h>
 
#include <algorithm>
#include <map>
#include <vector>
 
namespace OpenMS
{
  namespace Detail
  {
    template<typename T>
    struct MetaKeyGetter
    {
      static void getKeys(const T& object, std::vector<String>& keys)
      {
        object.getKeys(keys);
      };
    };
  }
 
  class /*OPENMS_DLLAPI -- disabled since it's template code only */ MetaInfoInterfaceUtils
  {
public:
    MetaInfoInterfaceUtils() = delete;
    MetaInfoInterfaceUtils(const MetaInfoInterfaceUtils&) = delete;
    MetaInfoInterfaceUtils& operator=(MetaInfoInterfaceUtils&) = delete;
    // no Move semantics for utils class
 
 
 
 
    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, typename Detail::MetaKeyGetter<typename T_In::value_type> getter = Detail::MetaKeyGetter<typename T_In::value_type>())
    {
      // make sure min_frequency is within [0,100]
      min_frequency = std::min(100.0f, std::max(0.0f, 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)
      {
        getter.getKeys(*it, 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 (const auto& [key, count] : counter)
      {
        if (count >= required_counts) 
        {
          common_keys.insert(common_keys.end(), key);
        }
      }
      return common_keys;
    }
  
  }; // class
 
} // namespace OPENMS