class _Semester extends stdClass
 {
  public $title, $semester_num, $notice, $bool_using_default_title;
  public $list_courses, $list_groups, $req_by_degree_id;
  /*
   * $title		Freshman, Sophomore, Summer II, etc.
   * $rankNum		Numeric "rank" or order of the semester object. 1,2,3, etc.
   *
   * *** MIGHT SHOULD BE A GROUP INSTEAD? A group can be a list
   *				of courses, and a list of groups.  That sounds like a semester
   *				to me.  But, if not...
   * $list_courses	This is a list of courses which are required
   * $list_groups	This is a list of the groups which are required.
   */

  function __construct($semester_num = "") 
   {
    $this->semester_num = $semester_num;

    $this->bool_using_default_title = FALSE;

    //$this->list_courses = new ObjList();
    $this->list_courses = new CourseList();
    $this->list_groups = new GroupList();

    $this->assign_title();
  }

  function equals(Semester $semester) 
   {

    if ($this->semester_num == $semester->semester_num) 
     {
      return true;
    }

    return false;
  }

  function assign_title() 
   {
    if ($this->semester_num == 0) 
     {
      $this->title = t("Freshman Year");
    }
    if ($this->semester_num == 1) 
     {
      $this->title = t("Sophomore Year");
    }
    if ($this->semester_num == 2) 
     {
      $this->title = t("Junior Year");
    }
    if ($this->semester_num == 3) 
     {
      $this->title = t("Senior Year");
    }
    if ($this->semester_num == 4) 
     {
      $this->title = t("Year 5");
    }

    // Still didn't find anything?
    if ($this->title == "") {
      $this->title = t("Year") . " " . ($this->semester_num + 1);
    }

    $this->bool_using_default_title = TRUE;

  }


  function to_string() 
   {
    $rtn = "";

    $rtn .= " Semester: $this->semester_num \n";
    if (!$this->list_courses->is_empty) 
     {
      $rtn .= $this->list_courses->to_string();
    }
    if (!$this->list_groups->is_empty) 
     {
      $rtn .= $this->list_groups->to_string();
    }

    return $rtn;
  }

  function reset_list_counters() 
   {
    // Goes through all lists in the semester and
    // calls function "reset_counter" on them.
    // Important to do before we start trying to use and
    // work with the semesters.
    $this->list_courses->reset_counter();
    $this->list_groups->reset_list_counters();
  }

}