/// <summary>
/// Recursively validates <paramref name="entity"/> by traversing all of its properties
/// </summary>
/// <param name="entity">The object to validate</param>
/// <param name="parentContext">The rule context of the object that <paramref name="entity"/> belongs to</param>
/// <param name="rules">The set of rules from the parent object to apply to <paramref name="entity"/></param>
/// <param name="traverseProperties">Whether or not to traverse this <paramref name="entity"/>'s properties</param>
/// <returns></returns>
private IEnumerable <LogMessage> RecursiveValidate(object entity, ObjectPath entityPath, RuleContext parentContext, IEnumerable <Rule> rules, bool traverseProperties = true)
{
var messages = Enumerable.Empty <LogMessage>();
if (entity == null)
{
return(messages);
}
// Ensure that the rules can be re-enumerated without re-evaluating the enumeration.
var collectionRules = rules.ReEnumerable();
var list = entity as IList;
var dictionary = entity as IDictionary;
if (traverseProperties && list != null)
{
// Recursively validate each list item and add the
// item index to the location of each validation message
var listMessages = list.SelectMany((item, index)
=> RecursiveValidate(item, entityPath.AppendIndex(index), parentContext.CreateChild(item, index), collectionRules));
messages = messages.Concat(listMessages);
}
else if (traverseProperties && dictionary != null)
{
// Dictionaries that don't provide any type info cannot be traversed, since it result in infinite iteration
var shouldTraverseEntries = dictionary.IsTraversableDictionary();
// Recursively validate each dictionary entry and add the entry
// key to the location of each validation message
var dictMessages = dictionary.SelectMany((key, value)
=> RecursiveValidate(value, entityPath.AppendProperty((string)key), parentContext.CreateChild(value, (string)key), collectionRules, shouldTraverseEntries));
messages = messages.Concat(dictMessages);
}
// If this is a class, validate its value and its properties.
else if (traverseProperties && entity.GetType().IsClass() && entity.GetType() != typeof(string))
{
// Validate each property of the object
var propertyMessages = entity.GetValidatableProperties()
.SelectMany(p => ValidateProperty(p, p.GetValue(entity), entityPath.AppendProperty(p.Name), parentContext));
messages = messages.Concat(propertyMessages);
}
// Validate the value of the object itself
var valueMessages = ValidateObjectValue(entity, collectionRules, parentContext);
return(messages.Concat(valueMessages));
}
public void PushIndex(int index)
{
_path.Push(Path.AppendIndex(index));
}
