/// <summary>
/// The MultiplyBy method multiplies the NonNegativeFraction by a Fraction
/// Throws an ArgumentOutOfRangeException if Fraction is less than zero
/// </summary>
/// <param name="fraction">Fraction by which to multiply</param>
protected override void MultiplyBy(Fraction fraction)
{
if (fraction.CompareTo(0) < 0)
{
throw new ArgumentOutOfRangeException("fraction", "Cannot multiply NonNegativeFraction by a negative fraction.");
}
base.MultiplyBy(fraction);
}
/// <summary>
/// The DivideBy method divides the NonNegativeFraction by a Fraction
/// Throws an ArgumentOutOfRangeException if divisor is less than zero
/// </summary>
/// <param name="divisor">Divisor fractionAddend</param>
protected override void DivideBy(Fraction divisor)
{
if (divisor.CompareTo(0) < 0)
{
throw new ArgumentOutOfRangeException("fraction", "Cannot multiply NonNegativeFraction by a negative fraction.");
}
base.DivideBy(divisor);
}
/// <summary>
/// The Add method adds a Fraction to the NonNegativeFraction
/// If the passed Fraction would cause the NonNegativeFraction to be negative, throws an ArgumentOutOfRangeException
/// </summary>
/// <param name="fraction">Fraction to add</param>
protected override void Add(Fraction fraction)
{
//if the fractionAddend is less than zero, checks if it will cause the
if (fraction.CompareTo(0) < 0)
{
Fraction checkingFrction = Copy();
checkingFrction += fraction;
if (checkingFrction.CompareTo(0) < 0)
{
throw new ArgumentOutOfRangeException("fraction", "Argument cannot make NonNegativeFraction negative.");
}
}
base.Add(fraction);
}
/// <summary>
/// The TeaspoonsToUserFriendlyMeasurements gets a collection of user friendly measurements
/// from RecipeFraction of teaspoons
/// </summary>
/// <param name="teaspoons">RecipeFraction containing number of teaspoons in the recipe</param>
/// <returns>Collection of user friendly measurements</returns>
private static ICollection <Measurement> TeaspoonsToUserFriendlyMeasurements(RecipeFraction teaspoons)
{
//Get simplified measurements, using as many quarter cups as possible
ICollection <Measurement> convertedMeasurements = GetMeasurementsFromQuarterCup(teaspoons.Copy());
int wholeTeaspoons = teaspoons.WholePart();
/**
* If could get a third of a cup from converted recipe, get measurements
* using third cups and then quarter cups (if applicable).
* Then compare two Collections of Measurments to see if Collection with third cups is more user-friendly
*/
if (wholeTeaspoons >= RecipeConstants.TSP_PER_THIRD_CUP)
{
ICollection <Measurement> tCupMeasurements = GetMeasurementsFromThirdCup(teaspoons);
//If same number of Measurements are returned, use Collection that starts with greater Measurement
if (convertedMeasurements.Count == tCupMeasurements.Count)
{
/*can cast as USCookingVolumeMeasurement because was created in this class.
* List is of type Measurement to be usable across multiple types of measurements.
* Casting required to access Amount with its current access modifier and making public is undesirable*/
Fraction qCups = ((USCookingVolumeMeasurement)convertedMeasurements.ElementAt(0)).Amount;
Fraction tCups = ((USCookingVolumeMeasurement)tCupMeasurements.ElementAt(0)).Amount;
if (tCups.CompareTo(qCups) > 0)
{
convertedMeasurements = tCupMeasurements;
}
}
//If the Collection with third cups is shorter than collection with quarter cups, use collection with third cups
else if (tCupMeasurements.Count < convertedMeasurements.Count)
{
convertedMeasurements = tCupMeasurements;
}
}
OptimizeMeasurements(convertedMeasurements);
return(convertedMeasurements);
}