/// <summary>
/// Validate user input arguments.
/// </summary>
/// <param name="compareBy"></param>
/// <returns></returns>
private bool Validate(AgeCompareCriteria compareBy)
{
if (compareBy == AgeCompareCriteria.Undefined)
{
throw new ArgumentException("The comparison type criteria was not defined");
}
if (_people == null)
{
throw new ArgumentException("A list people were expected");
}
return(true);
}
/// <summary>
/// Find the people whose ages differ according to the age comparison type criteria.
/// </summary>
/// <param name="compareBy">The age comparison type criteria</param>
/// <returns></returns>
private IEnumerable <Answer> SetAgeDifferences(AgeCompareCriteria compareBy)
{
Validate(compareBy);
// Get comparison results
var answerCandidates = _people.CombinationBuilder((a, b) => SetBirthdateInterval(a, b)).ToList <Answer>();
if (answerCandidates.Count < 1)
{
return(new List <Answer>());
}
return(answerCandidates.ToList().OrderBy(a => a.AgeInterval));
}
