public virtual IPermission Union <TActualResultType>(IPermission target) where TActualResultType : ObjectAccessPermission
{
try {
if (!(target is ObjectAccessPermission))
{
throw new ArgumentException("Can't unite anything other than an ObjectAccessPermission or one of its descendants!");
}
if (!typeof(ObjectAccessPermission).IsAssignableFrom(typeof(TActualResultType)))
{
throw new ArgumentException("Resultant object Type must be an ObjectAccessPermission or one of its descendants!");
}
List <ParticularAccessItem> resultItems = new List <ParticularAccessItem>();
IEnumerable <ParticularAccessItem> allItems = AccessItemList.Union(((ObjectAccessPermission)target).AccessItemList);
if (target is ConditionalObjectAccessPermission)
{
resultItems.AddRange(allItems.Distinct());
}
else
{
foreach (ParticularAccessItem item in allItems)
{
// only process items not already stored in the result set
if (!resultItems.Exists(i => i.ObjectType == item.ObjectType && i.Access == item.Access))
{
// a conditional item (with an actual condition) has precedence over unconditional items...
// NOTE: multiple non mutually-exclusive conditional items will be ignored!
ConditionalParticularAccessItem conditionalItem = item as ConditionalParticularAccessItem;
if (conditionalItem == null || conditionalItem != null && string.IsNullOrEmpty(conditionalItem.Condition))
{
var duplicateItems = allItems.Where(i => i.ObjectType == item.ObjectType && i.Access == item.Access && !object.ReferenceEquals(i, item));
conditionalItem =
(ConditionalParticularAccessItem)duplicateItems.FirstOrDefault(i => i is ConditionalParticularAccessItem && !string.IsNullOrEmpty(((ConditionalParticularAccessItem)i).Condition));
}
if (conditionalItem != null)
{
resultItems.Add(new ConditionalParticularAccessItem(conditionalItem.ObjectType, conditionalItem.Access, conditionalItem.Modifier, conditionalItem.Condition));
}
else
{
resultItems.Add(new ParticularAccessItem(item.ObjectType, item.Access, item.Modifier));
}
}
}
}
ObjectAccessPermission result = (ObjectAccessPermission)Activator.CreateInstance(typeof(TActualResultType));
resultItems.ForEach(item => result.AccessItemList.Add(item));
return(result);
} catch (Exception ex) {
throw new Exception(ex.ToString());
}
}
public override void FromXml(SecurityElement element)
{
base.FromXml(element);
condition = null;
if (element != null)
{
foreach (SecurityElement particularAccessItemElement in element.Children)
{
string tempCondition = particularAccessItemElement.Attribute(conditionAttr);
if (condition != null && condition != tempCondition)
{
throw new ArgumentException("Stored particular access item conditions do not match!");
}
condition = tempCondition ?? condition;
}
}
var newAccessList = AccessItemList.Select(item => new ConditionalParticularAccessItem(item.ObjectType, item.Access, item.Modifier, condition)).ToList();
AccessItemList.Clear();
foreach (ParticularAccessItem item in newAccessList)
{
AccessItemList.Add(item);
}
}
