/**
* Compare which object has a greater score.
* If scores are the same, then compare by their last names.
* If the last names are still the same, then compare by their first names.
*
* Pre-condition:
* x not null
* y not null
* Post-condition:
* return 1 if x < y
* return 0 if x = y
* return -1 if x > y
*/
public int Compare(object x, object y)
{
scoreRecord r1 = (scoreRecord)x;
scoreRecord r2 = (scoreRecord)y;
if (r2.score == r1.score)
{
if (r2.lastName == r1.lastName)
{
if (r2.firstName == r1.firstName)
{
return(0);
}
else
{
// second object has higher position if its name is in smaller alphabetical order
return(String.Compare(r1.firstName, r2.firstName, StringComparison.OrdinalIgnoreCase));
}
}
else
{
// second object has higher position if its name is in smaller alphabetical order
return(String.Compare(r1.lastName, r2.lastName, StringComparison.OrdinalIgnoreCase));
}
}
else
{
// second object has higher position if its score is higher
return((r2.score > r1.score) ? 1 : -1);
}
}
public void CompareTestSameScoresAndLastNameDifferntFirstName()
{
ScoreComparer sc = new ScoreComparer();
scoreRecord higherPositionCandidate = new scoreRecord();
scoreRecord lowerPositionCandidate = new scoreRecord();
higherPositionCandidate.firstName = "ABC";
higherPositionCandidate.lastName = "XYZ";
higherPositionCandidate.score = 50;
lowerPositionCandidate.firstName = "DEF";
lowerPositionCandidate.lastName = "XYZ";
lowerPositionCandidate.score = 50;
Assert.IsTrue(sc.Compare(lowerPositionCandidate, higherPositionCandidate) > 0);
Assert.IsTrue(sc.Compare(higherPositionCandidate, lowerPositionCandidate) < 0);
Assert.IsTrue(sc.Compare(higherPositionCandidate, higherPositionCandidate) == 0);
}
public void CompareTestDifferentScores()
{
ScoreComparer sc = new ScoreComparer();
scoreRecord higherPositionCandidate = new scoreRecord();
scoreRecord lowerPositionCandidate = new scoreRecord();
higherPositionCandidate.firstName = "ABC";
higherPositionCandidate.lastName = "XYZ";
higherPositionCandidate.score = 99;
lowerPositionCandidate.firstName = "ABC";
lowerPositionCandidate.lastName = "XYZ";
lowerPositionCandidate.score = 80;
Assert.IsTrue(sc.Compare(lowerPositionCandidate, higherPositionCandidate) > 0);
Assert.IsTrue(sc.Compare(higherPositionCandidate, lowerPositionCandidate) < 0);
Assert.IsTrue(sc.Compare(higherPositionCandidate, higherPositionCandidate) == 0);
}
