/// <summary>
/// Gets a collection of <see cref="OfferSettingsDisplay"/> from an <see cref="ILineItemContainer"/>.
/// </summary>
/// <param name="container">
/// The container.
/// </param>
/// <returns>
/// The <see cref="IEnumerable{OfferSettingsDisplay}"/>.
/// </returns>
internal static IEnumerable <OfferSettingsDisplay> GetOfferSettingsDisplays(this ILineItemContainer container)
{
if (!container.ContainsAnyCoupons())
{
return(Enumerable.Empty <OfferSettingsDisplay>());
}
return(container.Items.Select(GetOfferSettingsDisplay));
}
/// <summary>
/// Validates the constraint against the <see cref="ILineItemContainer"/>
/// </summary>
/// <param name="value">
/// The value to object to which the constraint is to be applied.
/// </param>
/// <param name="customer">
/// The <see cref="ICustomerBase"/>.
/// </param>
/// <returns>
/// The <see cref="Attempt{ILineItemContainer}"/> indicating whether or not the constraint can be enforced.
/// </returns>
public override Attempt<ILineItemContainer> TryApply(ILineItemContainer value, ICustomerBase customer)
{
return !value.ContainsAnyCoupons()
? this.Success(value)
: this.Fail(value, "One or more coupons have already been added.");
}
/// <summary>
/// Validates the constraint against the <see cref="ILineItemContainer"/>
/// </summary>
/// <param name="value">
/// The value to object to which the constraint is to be applied.
/// </param>
/// <param name="customer">
/// The <see cref="ICustomerBase"/>.
/// </param>
/// <returns>
/// The <see cref="Attempt{ILineItemContainer}"/> indicating whether or not the constraint can be enforced.
/// </returns>
public override Attempt <ILineItemContainer> TryApply(ILineItemContainer value, ICustomerBase customer)
{
return(!value.ContainsAnyCoupons()
? this.Success(value)
: this.Fail(value, "One or more coupons have already been added."));
}
