#ifndef DATETIME_SPECIAL_VALUE_FORMATTER_HPP___

#define DATETIME_SPECIAL_VALUE_FORMATTER_HPP___

/* Copyright (c) 2004 CrystalClear Software, Inc.

 * Use, modification and distribution is subject to the 

 * Boost Software License, Version 1.0. (See accompanying

 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)

 * Author: Jeff Garland

 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $

 */

#include <vector>

#include <string>

#include "boost/date_time/special_defs.hpp"

namespace boost { namespace date_time {

  //! Class that provides generic formmatting ostream formatting for special values

  /*! This class provides for the formmating of special values to an output stream.

   *  In particular, it produces strings for the values of negative and positive

   *  infinity as well as not_a_date_time.  

   *

   *  While not a facet, this class is used by the date and time facets for formatting

   *  special value types.

   *

   */

  template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > >

  class special_values_formatter  

  {

  public:

    typedef std::basic_string<CharT> string_type;

    typedef CharT                    char_type;

    typedef std::vector<string_type> collection_type;

    static const char_type default_special_value_names[3][17];

    //! Construct special values formatter using default strings.

    /*! Default strings are not-a-date-time -infinity +infinity

     */

    special_values_formatter() 

    {

      std::copy(&default_special_value_names[0], 

                &default_special_value_names[3], 

                std::back_inserter(m_special_value_names));      

    }

    //! Construct special values formatter from array of strings

    /*! This constructor will take pair of iterators from an array of strings

     *  that represent the special values and copy them for use in formatting

     *  special values.  

     *@code

     *  const char* const special_value_names[]={"nadt","-inf","+inf" };

     *

     *  special_value_formatter svf(&special_value_names[0], &special_value_names[3]);

     *@endcode

     */

    special_values_formatter(const char_type* const* begin, const char_type* const* end) 

    {

      std::copy(begin, end, std::back_inserter(m_special_value_names));

    }

    special_values_formatter(typename collection_type::iterator beg, typename collection_type::iterator end)

    {

      std::copy(beg, end, std::back_inserter(m_special_value_names));

    }

    OutItrT put_special(OutItrT next, 

                        const boost::date_time::special_values& value) const 

    {

      unsigned int index = value;

      if (index < m_special_value_names.size()) {

        std::copy(m_special_value_names[index].begin(), 

                  m_special_value_names[index].end(),

                  next);

      }

      return next;

    }

  protected:

    collection_type m_special_value_names;

  };

  //! Storage for the strings used to indicate special values 

  /* using c_strings to initialize these worked fine in testing, however,

   * a project that compiled its objects separately, then linked in a separate

   * step wound up with redefinition errors for the values in this array.

   * Initializing individual characters eliminated this problem */

  template <class CharT, class OutItrT>  

  const typename special_values_formatter<CharT, OutItrT>::char_type special_values_formatter<CharT, OutItrT>::default_special_value_names[3][17] = { 

    {'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'},

    {'-','i','n','f','i','n','i','t','y'},

    {'+','i','n','f','i','n','i','t','y'} };

 } } //namespace boost::date_time

#endif