imgtools/imglib/boostlibrary/boost/date_time/period.hpp
author timothy.murphy@nokia.com
Tue, 25 May 2010 12:38:07 +0100
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#ifndef DATE_TIME_PERIOD_HPP___
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#define DATE_TIME_PERIOD_HPP___
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/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
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 * Use, modification and distribution is subject to the 
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 * Boost Software License, Version 1.0. (See accompanying
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 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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 * Author: Jeff Garland, Bart Garst 
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 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
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 */
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/*! \file period.hpp
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  This file contain the implementation of the period abstraction. This is
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  basically the same idea as a range.  Although this class is intended for
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  use in the time library, it is pretty close to general enough for other
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  numeric uses.
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*/
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#include "boost/operators.hpp"
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namespace boost {
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namespace date_time {
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  //!Provides generalized period type useful in date-time systems
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  /*!This template uses a class to represent a time point within the period
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    and another class to represent a duration.  As a result, this class is
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    not appropriate for use when the number and duration representation 
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    are the same (eg: in the regular number domain).
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    A period can be specified by providing either the begining point and 
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    a duration or the begining point and the end point( end is NOT part 
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    of the period but 1 unit past it. A period will be "invalid" if either
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    end_point <= begin_point or the given duration is <= 0. Any valid period 
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    will return false for is_null().
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    Zero length periods are also considered invalid. Zero length periods are
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    periods where the begining and end points are the same, or, the given 
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    duration is zero. For a zero length period, the last point will be one 
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    unit less than the begining point.
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    In the case that the begin and last are the same, the period has a 
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    length of one unit.
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    The best way to handle periods is usually to provide a begining point and
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    a duration.  So, day1 + 7 days is a week period which includes all of the
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    first day and 6 more days (eg: Sun to Sat).
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   */
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  template<class point_rep, class duration_rep>
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  class period : private
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      boost::less_than_comparable<period<point_rep, duration_rep> 
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    , boost::equality_comparable< period<point_rep, duration_rep> 
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    > >
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  {
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  public:
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    typedef point_rep point_type;
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    typedef duration_rep duration_type;
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    period(point_rep first_point, point_rep end_point);
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    period(point_rep first_point, duration_rep len);
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    point_rep begin() const;
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    point_rep end() const;
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    point_rep last() const;
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    duration_rep length() const;
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    bool is_null() const;
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    bool operator==(const period& rhs) const;
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    bool operator<(const period& rhs) const;
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    void shift(const duration_rep& d);
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    void expand(const duration_rep& d);
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    bool contains(const point_rep& point) const;
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    bool contains(const period& other) const;
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    bool intersects(const period& other) const;
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    bool is_adjacent(const period& other) const;
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    bool is_before(const point_rep& point) const;
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    bool is_after(const point_rep& point) const;
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    period intersection(const period& other) const;
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    period merge(const period& other) const;
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    period span(const period& other) const;
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  private:
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    point_rep begin_;
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    point_rep last_;
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  };
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  //! create a period from begin to last eg: [begin,end)
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  /*! If end <= begin then the period will be invalid
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  period<point_rep,duration_rep>::period(point_rep first_point, 
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                                         point_rep end_point) : 
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    begin_(first_point), 
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    last_(end_point - duration_rep::unit())
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  {}
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  //! create a period as [begin, begin+len)
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  /*! If len is <= 0 then the period will be invalid
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  period<point_rep,duration_rep>::period(point_rep first_point, duration_rep len) :
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    begin_(first_point), 
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    last_(first_point + len-duration_rep::unit())
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  { }
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  //! Return the first element in the period
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  template<class point_rep, class duration_rep>
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  inline
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  point_rep period<point_rep,duration_rep>::begin() const 
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  {
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    return begin_;
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  }
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  //! Return one past the last element 
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  template<class point_rep, class duration_rep>
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  inline
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  point_rep period<point_rep,duration_rep>::end() const 
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  {
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    return last_ + duration_rep::unit();
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  }
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  //! Return the last item in the period
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  template<class point_rep, class duration_rep>
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  inline
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  point_rep period<point_rep,duration_rep>::last() const 
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  {
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    return last_;
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  }
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  //! True if period is ill formed (length is zero or less)
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  template<class point_rep, class duration_rep>
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  inline
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  bool period<point_rep,duration_rep>::is_null() const 
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  {
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    return end() <= begin_;
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  }
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  //! Return the length of the period
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  template<class point_rep, class duration_rep>
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  inline
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  duration_rep period<point_rep,duration_rep>::length() const
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  {
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    if(last_ < begin_){ // invalid period
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      return last_+duration_rep::unit() - begin_;
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    }
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    else{
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      return end() - begin_; // normal case
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    }
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  }
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  //! Equality operator
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  template<class point_rep, class duration_rep>
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  inline
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  bool period<point_rep,duration_rep>::operator==(const period& rhs) const 
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  {
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    return  ((begin_ == rhs.begin_) && 
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             (last_ == rhs.last_));
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  }
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  //! Strict as defined by rhs.last <= lhs.last
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  template<class point_rep, class duration_rep>
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  inline
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  bool period<point_rep,duration_rep>::operator<(const period& rhs) const 
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  {
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    return (last_ < rhs.begin_);
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  } 
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  //! Shift the start and end by the specified amount
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  template<class point_rep, class duration_rep>
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  inline
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  void period<point_rep,duration_rep>::shift(const duration_rep& d)
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  {
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    begin_ = begin_ + d;
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    last_  = last_  + d;
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  }
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  /** Expands the size of the period by the duration on both ends.
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   *
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   *So before expand 
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   *@code
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   *
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   *         [-------]
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   * ^   ^   ^   ^   ^   ^  ^
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   * 1   2   3   4   5   6  7
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   * 
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   *@endcode
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   * After expand(2)
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   *@code
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   *
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   * [----------------------]
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   * ^   ^   ^   ^   ^   ^  ^
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   * 1   2   3   4   5   6  7
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   * 
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   *@endcode
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  void period<point_rep,duration_rep>::expand(const duration_rep& d)
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  {
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    begin_ = begin_ - d;
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    last_  = last_  + d;
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  }
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  //! True if the point is inside the period, zero length periods contain no points
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  template<class point_rep, class duration_rep>
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  inline
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  bool period<point_rep,duration_rep>::contains(const point_rep& point) const 
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  {
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    return ((point >= begin_) &&
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            (point <= last_));
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  }
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  //! True if this period fully contains (or equals) the other period
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  template<class point_rep, class duration_rep>
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  inline
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  bool period<point_rep,duration_rep>::contains(const period<point_rep,duration_rep>& other) const
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  {
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    return ((begin_ <= other.begin_) && (last_ >= other.last_));
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  }
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  //! True if periods are next to each other without a gap.
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  /* In the example below, p1 and p2 are adjacent, but p3 is not adjacent
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   * with either of p1 or p2.
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   *@code
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   *   [-p1-)
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   *        [-p2-)
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   *          [-p3-) 
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   *@endcode
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  bool 
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  period<point_rep,duration_rep>::is_adjacent(const period<point_rep,duration_rep>& other) const 
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  {
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    return (other.begin() == end() ||
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            begin_ == other.end());
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  }
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  //! True if all of the period is prior or t < start
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  /* In the example below only point 1 would evaluate to true.
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   *@code
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   *     [---------])
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   * ^   ^    ^     ^   ^
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   * 1   2    3     4   5
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   * 
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   *@endcode
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  bool 
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  period<point_rep,duration_rep>::is_after(const point_rep& t) const 
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  { 
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    if (is_null()) 
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    {
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      return false; //null period isn't after
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    }
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    return t < begin_;
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  }
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  //! True if all of the period is prior to the passed point or end <= t
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  /* In the example below points 4 and 5 return true.
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   *@code
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   *     [---------])
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   * ^   ^    ^     ^   ^
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   * 1   2    3     4   5
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   * 
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   *@endcode
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  bool 
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  period<point_rep,duration_rep>::is_before(const point_rep& t) const 
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  { 
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    if (is_null()) 
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    {
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      return false;  //null period isn't before anything
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    }
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    return last_ < t;
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  }
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  //! True if the periods overlap in any way
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  /* In the example below p1 intersects with p2, p4, and p6.
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   *@code
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   *       [---p1---)
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   *             [---p2---)
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   *                [---p3---) 
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   *  [---p4---) 
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   * [-p5-) 
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   *         [-p6-) 
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   *@endcode
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  bool period<point_rep,duration_rep>::intersects(const period<point_rep,duration_rep>& other) const 
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  { 
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    return ( contains(other.begin_) ||
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             other.contains(begin_) ||
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             ((other.begin_ < begin_) && (other.last_ >= begin_)));
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  }
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  //! Returns the period of intersection or invalid range no intersection
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  template<class point_rep, class duration_rep>
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  inline
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  period<point_rep,duration_rep>
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  period<point_rep,duration_rep>::intersection(const period<point_rep,duration_rep>& other) const 
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  {
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    if (begin_ > other.begin_) {
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      if (last_ <= other.last_) { //case2
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        return *this;  
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      }
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      //case 1
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      return period<point_rep,duration_rep>(begin_, other.end());
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    }
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    else {
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      if (last_ <= other.last_) { //case3
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        return period<point_rep,duration_rep>(other.begin_, this->end());
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      }
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      //case4
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      return other;
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    }
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    //unreachable
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  }
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  //! Returns the union of intersecting periods -- or null period
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  /*! 
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  period<point_rep,duration_rep>
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  period<point_rep,duration_rep>::merge(const period<point_rep,duration_rep>& other) const 
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  {
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    if (this->intersects(other)) {      
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      if (begin_ < other.begin_) {
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        return period<point_rep,duration_rep>(begin_, last_ > other.last_ ? this->end() : other.end());
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      }
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      return period<point_rep,duration_rep>(other.begin_, last_ > other.last_ ? this->end() : other.end());
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    }
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    return period<point_rep,duration_rep>(begin_,begin_); // no intersect return null
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  }
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  //! Combine two periods with earliest start and latest end.
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  /*! Combines two periods and any gap between them such that 
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   *  start = min(p1.start, p2.start)
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   *  end   = max(p1.end  , p2.end)
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   *@code
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   *        [---p1---)
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   *                       [---p2---)
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   * result:
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   *        [-----------p3----------) 
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   *@endcode
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   */
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  template<class point_rep, class duration_rep>
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  inline
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  period<point_rep,duration_rep>
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  period<point_rep,duration_rep>::span(const period<point_rep,duration_rep>& other) const 
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  {
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    point_rep start((begin_ < other.begin_) ? begin() : other.begin());
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    point_rep newend((last_  < other.last_)  ? other.end() : this->end());
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    return period<point_rep,duration_rep>(start, newend);
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  }
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} } //namespace date_time
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#endif