class Series implements Comparable{
  String ID;
  String Title;
  int StartYear;
  int EndYear;
  int Span;
  int drawRow;

  Series(String _ID, String _Title, int _StartYear, int _EndYear){
    //println("made a series");
    ID = _ID;
    Title = _Title;
    StartYear = _StartYear;
    EndYear = _EndYear;
    Span = EndYear - StartYear; // span in years
    drawRow = 0; // the row location where the series will be drawn
  }
  
  int getSpan(){
    return Span;
  }
  
   int getStart(){
    return StartYear;
  }
  
  public int compareTo(Object anotherSeries)  {
    //if (!(anotherSeries instanceof Series)) throw new ClassCastException("A Series object expected.");
    int anotherSeriesStart = ((Series) anotherSeries).getStart();  
    return this.getStart() - anotherSeriesStart;  // return negative if this is earlier
  }

}