/// <summary>
/// Sets the conversion function for a particular conversion function lookup.
/// </summary>
/// <typeparam name="TQuantity">The quantity type, must implement <see cref="IQuantity"/>.</typeparam>
/// <param name="conversionLookup">The quantity conversion function lookup key.</param>
/// <param name="conversionFunction">The quantity conversion function.</param>
internal void SetConversionFunction <TQuantity>(ConversionFunctionLookupKey conversionLookup, ConversionFunction <TQuantity> conversionFunction)
where TQuantity : IQuantity
{
IQuantity TypelessConversionFunction(IQuantity quantity) => conversionFunction((TQuantity)quantity);
_conversionFunctions[conversionLookup] = TypelessConversionFunction;
}
/// <summary>
/// Sets the conversion function from two units of the same quantity type.
/// </summary>
/// <typeparam name="TQuantity">The type of quantity, must implement <see cref="IQuantity"/>.</typeparam>
/// <param name="from">From unit enum value, such as <see cref="LengthUnit.Kilometer" />.</param>
/// <param name="to">To unit enum value, such as <see cref="LengthUnit.Centimeter"/>.</param>
/// <param name="conversionFunction">The quantity conversion function.</param>
public void SetConversionFunction <TQuantity>(Enum from, Enum to, ConversionFunction <TQuantity> conversionFunction)
where TQuantity : IQuantity
{
var quantityType = typeof(TQuantity);
var conversionLookup = new ConversionFunctionLookupKey(quantityType, from, quantityType, to);
SetConversionFunction(conversionLookup, conversionFunction);
}
/// <summary>
/// Gets the conversion function by its lookup key.
/// </summary>
/// <param name="lookupKey"></param>
internal ConversionFunction GetConversionFunction(ConversionFunctionLookupKey lookupKey)
{
IQuantity EchoFunction(IQuantity fromQuantity) => fromQuantity;
// If from/to units and to quantity types are equal, then return a function that echoes the input quantity
// in order to not have to map conversion functions to "self".
if (lookupKey.Item1 == lookupKey.Item3 && Equals(lookupKey.Item2, lookupKey.Item4))
{
return(EchoFunction);
}
return(_conversionFunctions[lookupKey]);
}
/// <summary>
/// Sets the conversion function for a particular conversion function lookup.
/// </summary>
/// <param name="lookupKey">The lookup key.</param>
/// <param name="conversionFunction">The quantity conversion function.</param>
internal void SetConversionFunction(ConversionFunctionLookupKey lookupKey, ConversionFunction conversionFunction)
{
_conversionFunctions[lookupKey] = conversionFunction;
}
/// <summary>
/// Sets the conversion function from two units of different quantity types.
/// </summary>
/// <param name="fromType">From quantity type, must implement <see cref="IQuantity"/>.</param>
/// <param name="from">From unit enum value, such as <see cref="LengthUnit.Kilometer" />.</param>
/// <param name="toType">To quantity type, must implement <see cref="IQuantity"/>.</param>
/// <param name="to">To unit enum value, such as <see cref="LengthUnit.Centimeter"/>.</param>
/// <param name="conversionFunction">The quantity conversion function.</param>
public void SetConversionFunction(Type fromType, Enum from, Type toType, Enum to, ConversionFunction conversionFunction)
{
var conversionLookup = new ConversionFunctionLookupKey(fromType, from, toType, to);
SetConversionFunction(conversionLookup, conversionFunction);
}
/// <summary>
///
/// </summary>
/// <param name="lookupKey"></param>
/// <param name="conversionFunction"></param>
/// <returns>true if set; otherwise, false.</returns>
public bool TryGetConversionFunction(ConversionFunctionLookupKey lookupKey, out ConversionFunction conversionFunction)
{
return(_conversionFunctions.TryGetValue(lookupKey, out conversionFunction));
}
/// <summary>
/// Try to get the conversion function for two units of the same quantity type.
/// </summary>
/// <param name="fromType">From quantity type, must implement <see cref="IQuantity"/>.</param>
/// <param name="from">From unit enum value, such as <see cref="LengthUnit.Kilometer" />.</param>
/// <param name="toType">To quantity type, must implement <see cref="IQuantity"/>.</param>
/// <param name="to">To unit enum value, such as <see cref="LengthUnit.Centimeter"/>.</param>
/// <param name="conversionFunction">The quantity conversion function.</param>
/// <returns>true if set; otherwise, false.</returns>
public bool TryGetConversionFunction(Type fromType, Enum from, Type toType, Enum to, out ConversionFunction conversionFunction)
{
var conversionLookup = new ConversionFunctionLookupKey(fromType, from, toType, to);
return(TryGetConversionFunction(conversionLookup, out conversionFunction));
}
/// <summary>
/// Gets the conversion function from two units of different quantity types.
/// </summary>
/// <param name="fromType">From quantity type, must implement <see cref="IQuantity"/>.</param>
/// <param name="from">From unit enum value, such as <see cref="LengthUnit.Kilometer" />.</param>
/// <param name="toType">To quantity type, must implement <see cref="IQuantity"/>.</param>
/// <param name="to">To unit enum value, such as <see cref="LengthUnit.Centimeter"/>.</param>
public ConversionFunction GetConversionFunction(Type fromType, Enum from, Type toType, Enum to)
{
var conversionLookup = new ConversionFunctionLookupKey(fromType, from, toType, to);
return(GetConversionFunction(conversionLookup));
}
