/**
 * Class StudentListWithGrade
 * contains a letter grade and is also an ordered list of student names
 * It can be seen as comparable and the comparison will be simply based
 * on the letter grade associated with this list (no comparison as a list of
 * student names at al.)
 * 
 * @author Lucia Moura
 *
 */
public class StudentListWithGrade extends OrderedList<String> implements Comparable<StudentListWithGrade> {

	private String letterGrade;
	
	StudentListWithGrade(String grade) {
		letterGrade=grade;
	}
	
	@Override	
	public int compareTo(StudentListWithGrade arg0) {
		int comp=this.letterGrade.compareTo(arg0.letterGrade);
		if (comp == 0)
			return 0;
		else 
			if (this.letterGrade.charAt(0)>arg0.letterGrade.charAt(0)) return -1;
			else if (this.letterGrade.charAt(0)<arg0.letterGrade.charAt(0)) return 1;
			else {
				Integer second1=2; 
				if (this.letterGrade.length()>1)
					if (this.letterGrade.charAt(1)=='-') second1=1;
					else
					if (this.letterGrade.charAt(1)=='+') second1=3;
				Integer second2=2;
				if (arg0.letterGrade.length()>1)
					if (arg0.letterGrade.charAt(1)=='-') second2=1;
					else
					if (arg0.letterGrade.charAt(1)=='+') second2=3;
				return (second1.compareTo(second2));
			}
		
			
			
	}
	
	/**
	 * getter method for letter grade
	 * @return the letter grade associated with this list of student names
	 */
	public String getLetterGrade() {
		return letterGrade;
	}
	
	/* Overides toString method returning concatenation of the letter grade and the ordered list
	 * @see OrderedList#toString()
	 */
	public String toString() {
		return getLetterGrade()+ super.toString();
	}
	
   
}