//
//  CRF++ -- Yet Another CRF toolkit
//
//  $Id: stream_wrapper.h 1588 2007-02-12 09:03:39Z taku $;
//
//  Copyright(C) 2005-2007 Taku Kudo <taku@chasen.org>
//
#ifndef CRFPP_STREAM_WRAPPER_H__
#define CRFPP_STREAM_WRAPPER_H__

#include <iostream>
#include <fstream>
#include <cstring>

namespace CRFPP {

  class istream_wrapper {
  private:
    std::istream* is;
  public:
    std::istream &operator*() const  { return *is; }
    std::istream *operator->() const { return is;  }
    std::istream *get() { return is; }
    explicit istream_wrapper(const char* filename): is(0) {
      if (std::strcmp(filename, "-") == 0)
        is = &std::cin;
      else
        is = new std::ifstream(filename);
    }

    ~istream_wrapper() {
      if (is != &std::cin) delete is;
    }
  };

  class ostream_wrapper {
  private:
    std::ostream* os;
  public:
    std::ostream &operator*() const  { return *os; }
    std::ostream *operator->() const { return os;  }
    std::ostream *get() { return os; }
    explicit ostream_wrapper(const char* filename): os(0) {
      if (std::strcmp(filename, "-") == 0)
        os = &std::cout;
      else
        os = new std::ofstream(filename);
    }

    ~ostream_wrapper() {
      if (os != &std::cout) delete os;
    }
  };
}

#endif