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//
// G4FileUtilities
//
// Class Description:
//
// File utilities to access files with POSIX interface

// Author: Youhei Morita, 24.08.2001
// --------------------------------------------------------------------
#ifndef G4FILE_UTILITIES_HH
#define G4FILE_UTILITIES_HH 1

#include "G4Types.hh"
#include "G4String.hh"

#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <iostream>

class G4FileUtilities
{
  public:

    G4FileUtilities();
      // Constructor

    ~G4FileUtilities();
      // Destructor

    G4bool FileExists(const G4String& file);
      // checks if the "file" exists.  returns true if it does

    std::string StrErrNo() const { return ::strerror(errno); }
      // returns the error message of the last system call as string

    G4int Shell(const G4String& str) { return ::system(str.c_str()); }
      // executes the shell command.  returns zero if success

    G4int CopyFile(const G4String& srcFile, const G4String& dstFile);
      // copies the "srcFile" to "dstFile".  returns zero if success

    G4int DeleteFile(const G4String& file, const G4String& option);
      // deletes the "file" with the "option".  returns zero if success

    std::string GetEnv(const G4String& env) { return ::getenv(env.c_str()); }
      // retuns the value of environment variable as string

};

#endif