/// <summary>
/// Evaluates the set of business rules applying to a given situation.
/// </summary>
/// <param name="situation">Situation to which business rules are applied.</param>
/// <param name="item">Parameter of the situation (typically the entity that is
/// subject to the business process).</param>
/// <param name="failedRules">Collection to which should be added the business rules
/// that failed, or <b>null</b> if this information is not requested.</param>
/// <returns><b>true</b> if all rules were successful, otherwise <b>false</b>.</returns>
public static bool Evaluate(string situation, object item, BusinessRuleCollection failedRules)
{
if (situation == null)
{
throw new ArgumentNullException("situation");
}
List <BusinessRule> businessRulesForThisSituation;
if (!businessRules.TryGetValue(situation, out businessRulesForThisSituation))
{
return(true);
}
else
{
bool success = true;
foreach (BusinessRule rule in businessRulesForThisSituation)
{
if (rule.Evaluate(item))
{
continue;
}
success = false;
if (failedRules != null)
{
failedRules.Add(rule);
}
}
return(success);
}
}
/// <summary>
/// Throws an exception when fails at least one of the business rules applying to a
/// given situation.
/// </summary>
/// <param name="situation">Situation to which business rules are applied.</param>
/// <param name="item">Parameter of the situation (typically the entity that is
/// subject to the business process).</param>
/// <exception cref="BusinessRuleException">At least one of the business rules was
/// not fulfilled.</exception>
public static void Assert(string situation, object item)
{
BusinessRuleCollection failedRules = new BusinessRuleCollection();
if (!Evaluate(situation, item, failedRules))
{
throw new BusinessRuleException(failedRules);
}
}
private void ThrowExceptionIfUserIsInvalid(Domain.User.User newUser)
{
var brokenRules = new BusinessRuleCollection(_userValidator.GetBrokenRules(newUser));
if (brokenRules.HasRules())
{
throw new ValidationException(brokenRules.GetRulesSummary());
}
}
private void ThrowExceptionIfTaskIsInvalid(Domain.Task.Task newTask)
{
var brokenRules = new BusinessRuleCollection(_taskValidator.GetBrokenRules(newTask));
if (brokenRules.HasRules())
{
throw new ValidationException(brokenRules.GetRulesSummary());
}
}
public void AddRulesTest()
{
var rule = new BusinessRule
{
Description = "test"
};
var rules = new BusinessRuleCollection();
rules.AddRule(rule);
Assert.IsTrue(rules.HasRules());
}
public void GetRulesSummaryTest()
{
var rule1 = new BusinessRule
{
Description = "test1"
};
var rule2 = new BusinessRule
{
Description = "test2"
};
var rules = new BusinessRuleCollection();
rules.AddRule(rule1);
rules.AddRule(rule2);
var expected = "test1" + Environment.NewLine + "test2";
Assert.AreEqual(expected, string.Join(Environment.NewLine, rules.GetRulesSummary()));
}
