FileSystem.h

/**************************************************************************
 * BASF2 (Belle Analysis Framework 2)                                     *
 * Copyright(C) 2013-2018 Belle II Collaboration                          *
 *                                                                        *
 * Author: The Belle II Collaboration                                     *
 * Contributors: Christian Pulvermacher, Thomas Kuhr, Martin Ritter       *
 *                                                                        *
 * This software is provided "as is" without any warranty.                *
 **************************************************************************/
#pragma once
 
#include <string>
#include <vector>
#include <fstream>
 
namespace Belle2 {
  class FileSystem {
  public:
    static std::string findFile(const std::string& path, bool silent = false);
 
    static std::string findFile(const std::string& path, const std::string& dataType, bool silent = false);
 
    static bool fileExists(const std::string& filename);
    static bool fileDirExists(const std::string& filename);
    static bool isFile(const std::string& filename);
    static bool isDir(const std::string& filename);
    static bool isSymLink(const std::string& filename);
 
    static std::string calculateMD5(const std::string& filename);
 
    static std::string calculateAdler32(const std::string& filename);
 
    static bool loadLibrary(std::string library, bool fullname = true);
 
    class Lock {
    public:
 
      explicit Lock(const std::string& fileName, bool readonly = false);
 
      ~Lock();
 
      bool lock(int timeout = 300, bool ignoreErrors = false);
 
    private:
      int m_file;  
      bool m_readOnly; 
    };
 
    class TemporaryFile: public std::fstream {
    public:
      explicit TemporaryFile(std::ios_base::openmode mode = std::ios_base::trunc | std::ios_base::out);
      TemporaryFile(const TemporaryFile&) = delete;
      TemporaryFile(TemporaryFile&&) = delete;
      TemporaryFile& operator=(const TemporaryFile&) = delete;
      ~TemporaryFile();
      std::string getName() const { return m_filename; }
    private:
      std::string m_filename;
    };
 
  private:
    FileSystem() = delete;
 
    static std::string findFile(const std::string& path, const std::vector<std::string>& dirs, bool silent);
  };
}