/// <summary>
/// Run the validation rules contained in <code>validators</code>
/// for element <code>element</code>. Throw an exception if validation
/// fails.
/// </summary>
/// <typeparam name="T">the type of the element to validate.</typeparam>
/// <typeparam name="TK">the type of the UI element keys on which errors must be displayed.</typeparam>
/// <typeparam name="TV">the type of the error messages.</typeparam>
/// <param name="element">the element to validate.</param>
/// <param name="validators">the validators.</param>
/// <exception cref="ArgumentNullException">if any of the method parameters is <code>null</code>.</exception>
/// <exception cref="GojulValidationException{TK, TV}">if the validation fails.</exception>
public static async Task ValidateAsync <T, TK, TV>(T element, IEnumerable <IGojulValidator <T, TK, TV> > validators)
{
if (element == null)
{
throw new ArgumentNullException("element is null");
}
Condition.Requires(validators).IsNotNull();
var errorMessageContainer = new GojulValidationErrorMessageContainer <TK, TV>();
foreach (var v in validators)
{
await v.ValidateAsync(element, errorMessageContainer).ConfigureAwait(false);
}
if (errorMessageContainer.HasErrors)
{
throw new GojulValidationException <TK, TV>("Validation failed", errorMessageContainer);
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="message">the error message.</param>
/// <param name="errorMessageContainer">the error message container which is the cause of the error.</param>
/// <exception cref="ArgumentNullException">if <code>errorMessageContainer</code> is <code>null</code></exception>.
public GojulValidationException(string message, GojulValidationErrorMessageContainer <TK, TV> errorMessageContainer) : base(message)
{
Condition.Requires(errorMessageContainer).IsNotNull();
this.ErrorMessageContainer = errorMessageContainer;
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="errorMessageContainer">the error message container which is the cause of the error.</param>
/// <exception cref="ArgumentNullException">if <code>errorMessageContainer</code> is <code>null</code></exception>.
public GojulValidationException(GojulValidationErrorMessageContainer <TK, TV> errorMessageContainer) : this("A validation error occurred", errorMessageContainer)
{
}