/// <summary>
/// Adds a rule to the validation plan.
/// </summary>
/// <param name="rule"> The rule to add. </param>
/// <param name="setup"> A function that further sets up the added rule. </param>
/// <returns> </returns>
public ValidationPlan <TTarget> AddRule(
Func <TTarget, bool> rule,
Func <ValidationRule <TTarget>, ValidationRule <TTarget> > setup = null)
{
var validationRule = new ValidationRule <TTarget>(rule);
if (setup != null)
{
validationRule = setup(validationRule);
}
rules.Add(validationRule);
return(this);
}
/// <summary>
/// Initializes a new instance of the <see cref="ValidationRule{TTarget}" /> class.
/// </summary>
/// <param name="fromRule"> The rule upon which the new rule wil be based. </param>
/// <remarks>
/// This is used to clone a rule.
/// </remarks>
protected ValidationRule(ValidationRule <TTarget> fromRule)
{
condition = fromRule.condition;
CreatesEvaluationsAsInternal = fromRule.CreatesEvaluationsAsInternal;
if (fromRule.preconditions != null)
{
preconditions = new List <IValidationRule <TTarget> >(fromRule.preconditions);
}
if (fromRule.extensions != null)
{
extensions = new Dictionary <Type, object>(fromRule.extensions);
}
if (fromRule.MessageGenerator != null)
{
MessageGenerator = fromRule.MessageGenerator;
}
}
private static IEnumerable <IValidationRule <TTarget> > AllPreconditions(ValidationRule <TTarget> rule)
{
if (rule?.preconditions != null)
{
foreach (var precondition in rule.preconditions)
{
// if the precondition is a ValidationPlan, yield all of its rules and the plan itself
// this will traverse preconditions
var preconditionPlan = precondition as ValidationPlan <TTarget>;
if (preconditionPlan != null)
{
foreach (var planRule in preconditionPlan.AllRules())
{
yield return(planRule);
}
yield return(preconditionPlan);
continue;
}
// otherwise, recursively check the rule's preconditions, so that the last will be yielded first
var preconditionRule = precondition as ValidationRule <TTarget>;
if (preconditionRule != null)
{
foreach (var prePreCondition in AllPreconditions(preconditionRule))
{
yield return(prePreCondition);
}
}
// if the precondition is not a ValidationPlan, yield just the rule
yield return(precondition);
}
}
}
