/// <summary>
/// Given a validation rule and a collection of tuples of parameter to object bindings (represented as list),
/// create corresponding RuleBindings.
/// We create a separate rule binding for each parameter to object binding tuple.
/// </summary>
/// <param name="rule"></param>
/// <param name="objectBindings"></param>
/// <returns></returns>
private static IEnumerable <RuleBinding <TResult> > GetRuleBindings(ValidationRule <TResult> rule, IEnumerable <IEnumerable <ParameterObjectBinding> > objectBindings)
{
var result = new List <RuleBinding <TResult> >();
foreach (var objectBinding in objectBindings)
{
var bindings = (from dependency in rule.Signature
select new ValidationRuleDependencyBinding
{
ValidationRuleDependency = dependency,
ParameterObjectBinding = objectBinding.Single(b => b.ParameterName == dependency.ParameterExpression.Name)
}).Distinct(new ValidationRuleDependencyBindingComparer());
if (bindings.Count() != rule.Signature.Count())
{
continue;
}
result.Add(new RuleBinding <TResult>
{
DependencyBindings = bindings.ToArray(),
ValidationRule = rule
});
}
return(result);
}
/// <summary>
/// Given a validation rule with dependency expressions and a collection of objects
/// return a list of tuples (represented as lists) with all permutations of matching objects.
/// </summary>
/// <param name="rule"></param>
/// <param name="objects"></param>
/// <returns></returns>
private static IEnumerable <IEnumerable <ParameterObjectBinding> > GetRuleArgumentObjectBindings(ValidationRule <TResult> rule, IEnumerable <TEntity> objects)
{
List <IEnumerable <ParameterObjectBinding> > bindings = new List <IEnumerable <ParameterObjectBinding> >();
var dependencyParameters = rule.GetValidationRuleDependencyParameters();
var parameterObjectBindings =
(from obj in objects
from parameter in dependencyParameters
where parameter.ParameterObjectType.IsAssignableFrom(obj.GetType())
select new ParameterObjectBinding {
ParameterName = parameter.ParameterName, ParameterObjectType = parameter.ParameterObjectType, ParameterObject = obj
})
.GroupBy(x => x.ParameterName);
foreach (var group in parameterObjectBindings.ToList())
{
bindings.Add(group.ToList());
}
return(GetPermutations(bindings));
}