/// <summary>
/// Adds a validator to the validator composer, checking all elements in a collection.
/// </summary>
/// <typeparam name="T">The type of elements the final validator will be able to validate.</typeparam>
/// <typeparam name="TItem">The type of elements in the inner collection.</typeparam>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{T, TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="itemsSelector">A method that gets the collection of elments to validate.</param>
/// <param name="itemValidator">The validator that should be used to validate each element in the collection returned by <paramref name="itemsSelector"/>.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with the validation rules defined by <paramref name="itemValidator"/>.</returns>
public static TReturn WhereAll <T, TItem, TReturn>(this IValidatorComposer <T, TReturn> composer, Func <T, IEnumerable <TItem> > itemsSelector, IValidator <TItem> itemValidator)
{
return(Where(composer, Validator <T> .Create(x =>
{
using (var e = itemsSelector(x).GetEnumerator())
{
var m = itemValidator.Validate(e.Current);
if (m.IsError)
{
return m;
}
}
return Message.NoError;
})));
}
/// <summary>
/// Adds a validator to the validator composer with an <c>And</c> operator.
/// </summary>
/// <typeparam name="T">The type of elements the final validator will be able to validate.</typeparam>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{T, TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="validator">A validator that should be added to the composer.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with the validation rules defined by <paramref name="validator"/>.</returns>
public static TReturn Where <T, TReturn>(this IValidatorComposer <T, TReturn> composer, IValidator <T> validator)
{
return(composer.WithValidator(Validator <T> .And(composer.Validator, validator)));
}
/// <summary>
/// Adds a predicate method to the validator composer, using <paramref name="onError"/> when the predicate does not hold true.
/// </summary>
/// <typeparam name="T">The type of elements the final validator will be able to validate.</typeparam>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{T, TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="predicate">A method that takes an element for validation as input and returns a bool indicating if validation was successful.</param>
/// <param name="onError">A method that generates an error message from the invalid element, when <paramref name="predicate"/> returns <c>false</c>.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with <paramref name="predicate"/>.</returns>
public static TReturn Where <T, TReturn>(this IValidatorComposer <T, TReturn> composer, Predicate <T> predicate, Func <T, Message> onError)
{
return(Where(composer, Validator <T> .Create(x => predicate(x) ? Message.NoError : onError(x))));
}
/// <summary>
/// Adds a predicate method to the validator composer, using <paramref name="errorMessage"/> when the predicate does not hold true.
/// </summary>
/// <typeparam name="T">The type of elements the final validator will be able to validate.</typeparam>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{T, TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="predicate">A method that takes an element for validation as input and returns a bool indicating if validation was successful.</param>
/// <param name="errorMessage">The message returned when <paramref name="predicate"/> returns <c>false</c>.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with <paramref name="predicate"/>.</returns>
public static TReturn Where <T, TReturn>(this IValidatorComposer <T, TReturn> composer, Predicate <T> predicate, Message errorMessage)
{
return(Where(composer, Validator <T> .Create(x => predicate(x) ? Message.NoError : errorMessage)));
}
/// <summary>
/// Adds a predicate method to the validator composer, with a generic message when the predicate does not hold true.
/// </summary>
/// <typeparam name="T">The type of elements the final validator will be able to validate.</typeparam>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{T, TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="predicate">A method that takes an element for validation as input and returns a bool indicating if validation was successful.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with <paramref name="predicate"/>.</returns>
public static TReturn Where <T, TReturn>(this IValidatorComposer <T, TReturn> composer, Predicate <T> predicate)
{
return(Where(composer, predicate, x => new Message($"[red:{x}] is not a valid value.")));
}
/// <summary>
/// Adds a predicate method to the validator composer, using <paramref name="errorMessage"/> when the predicate does not hold true.
/// </summary>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="predicate">A method that returns a bool indicating if validation was successful.</param>
/// <param name="errorMessage">The message returned when <paramref name="predicate"/> returns <c>false</c>.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with <paramref name="predicate"/>.</returns>
public static TReturn Where <TReturn>(this IValidatorComposer <TReturn> composer, Func <bool> predicate, Message errorMessage)
{
return(Where(composer, Validator.Create(() => predicate() ? Message.NoError : errorMessage)));
}
/// <summary>
/// Adds a predicate method to the validator composer, with a generic message when the predicate does not hold true.
/// </summary>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="predicate">A method that returns a bool indicating if validation was successful.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with <paramref name="predicate"/>.</returns>
public static TReturn Where <TReturn>(this IValidatorComposer <TReturn> composer, Func <bool> predicate)
{
return(Where(composer, predicate, new Message("Validation failed.")));
}
/// <summary>
/// Adds a validator to the validator composer, checking all elements in a collection.
/// </summary>
/// <typeparam name="T">The type of elements the final validator will be able to validate.</typeparam>
/// <typeparam name="TItem">The type of elements in the inner collection.</typeparam>
/// <typeparam name="TReturn">The returned composer type. See <see cref="IValidatorComposer{T, TReturn}"/> for details.</typeparam>
/// <param name="composer">The validator composer being extended.</param>
/// <param name="itemsSelector">A method that gets the collection of elments to validate.</param>
/// <param name="itemValidatorComposer">A method for fluently configure validation of each element returned by <paramref name="itemsSelector"/>.</param>
/// <returns>A <typeparamref name="TReturn"/> that extends <paramref name="composer"/> with the validation rules defined by <paramref name="itemValidatorComposer"/>.</returns>
public static TReturn WhereAll <T, TItem, TReturn>(this IValidatorComposer <T, TReturn> composer, Func <T, IEnumerable <TItem> > itemsSelector, Func <ValidatorComposer <TItem>, ValidatorComposer <TItem> > itemValidatorComposer)
{
return(WhereAll(composer, itemsSelector, itemValidatorComposer(ValidatorComposer <TItem> .NoRules).Validator));
}
