MS2File.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2017.
//
// This software is released under a three-clause BSD license:
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//  * Redistributions in binary form must reproduce the above copyright
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//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
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// --------------------------------------------------------------------------
// $Maintainer: Timo Sachsenberg $
// $Authors: Andreas Bertsch $
// --------------------------------------------------------------------------

#ifndef OPENMS_FORMAT_MS2FILE_H
#define OPENMS_FORMAT_MS2FILE_H

#include <OpenMS/DATASTRUCTURES/String.h>
#include <OpenMS/CONCEPT/Exception.h>
#include <OpenMS/SYSTEM/File.h>
#include <OpenMS/CONCEPT/ProgressLogger.h>
#include <OpenMS/METADATA/DocumentIdentifier.h>

#include <vector>
#include <fstream>

namespace OpenMS
{
  class OPENMS_DLLAPI MS2File :
    public ProgressLogger
  {
public:

    MS2File();

    virtual ~MS2File();

    template <typename MapType>
    void load(const String & filename, MapType & exp)
    {
      //startProgress(0,0,"loading DTA2D file");

      if (!File::exists(filename))
      {
        throw Exception::FileNotFound(__FILE__, __LINE__, OPENMS_PRETTY_FUNCTION, filename);
      }
      if (!File::readable(filename))
      {
        throw Exception::FileNotReadable(__FILE__, __LINE__, OPENMS_PRETTY_FUNCTION, filename);
      }

      exp.reset();

      //set DocumentIdentifier
      exp.setLoadedFileType(filename);
      exp.setLoadedFilePath(filename);

      std::ifstream in(filename.c_str());

      UInt spectrum_number = 0;
      typename MapType::SpectrumType spec;
      typename MapType::SpectrumType::PeakType p;

      String line;
      bool first_spec(true);

      // line number counter
      Size line_number = 0;

      while (getline(in, line, '\n'))
      {
        ++line_number;

        line.trim();
        if (line.empty()) continue;

        // header
        if (line[0] == 'H')
        {
          continue;
        }

        // scan
        if (line[0] == 'S')
        {
          if (!first_spec)
          {
            spec.setMSLevel(2);
            spec.setNativeID(String("index=") + (spectrum_number++));
            exp.addSpectrum(spec);
          }
          else
          {
            first_spec = false;
          }
          spec.clear(true);
          line.simplify();
          std::vector<String> split;
          line.split(' ', split);
          if (split.size() != 4)
          {
            throw Exception::ParseError(__FILE__, __LINE__, OPENMS_PRETTY_FUNCTION, "line (" + String(line_number) + ") '" + line  + "' should contain four values, got " + String(split.size()) + "!", "");
          }
          spec.getPrecursors().resize(1);
          spec.getPrecursors()[0].setMZ(split[3].toDouble());
          continue;
        }

        // charge-independent analysis
        if (line[0] == 'I')
        {
          continue;
        }

        // charge specification
        if (line[0] == 'Z')
        {
          continue;
        }

        // charge-dependent analysis
        if (line[0] == 'D')
        {
          continue;
        }

        // yet another peak, hopefully
        line.simplify();
        std::vector<String> split;
        line.split(' ', split);
        if (split.size() != 2)
        {
          throw Exception::ParseError(__FILE__, __LINE__, OPENMS_PRETTY_FUNCTION, "line (" + String(line_number) + ") '" + line  + "' should contain two values, got " + String(split.size()) + "!", "");
        }

        try
        {
          p.setPosition(split[0].toDouble());
          p.setIntensity(split[1].toFloat());
        }
        catch (Exception::ConversionError /*&e*/)
        {
          throw Exception::ParseError(__FILE__, __LINE__, OPENMS_PRETTY_FUNCTION, "ConversionError: line (" + String(line_number) + ") '" + line  + "' does not contain two numbers!", "");
        }
        spec.push_back(p);
      }

      if (!first_spec)
      {
        spec.setMSLevel(2);
        spec.setNativeID(String("index=") + (spectrum_number++));
        exp.addSpectrum(spec);
      }
    }

    /*
    template <typename MapType> void store(const String& filename, MapType& map)
    {

    }
    */

protected:

  };

} // namespace OpenMS

#endif // OPENMS_FORMAT_MS2FILE_H