def get_parser(scheduler, err_file, out_file=None, run_err_file=None, batch_err_file=None):
    """
    Factory function to provide the parser for the specified scheduler. If the scheduler is not implemented None is
    returned. The files, string, correspond to file names of the out and err files:
    err_file        stderr of the scheduler
    out_file        stdout of the scheduler
    run_err_file    stderr of the application
    batch_err_file  stderr of the submission

    Returns:
        None if scheduler is not supported.
    """
    cls = ALL_PARSERS.get(scheduler)
    return cls if cls is None else cls(err_file, out_file, run_err_file, batch_err_file)