private bool CheckLocalReBuildRequired(IClearanceSource clearanceSource)
{
if (!ReferenceEquals(_LastClearanceSource, clearanceSource))
{
_LocalFilterExpression = null;
_LastClearanceSource = clearanceSource;
}
var ccDate = _LastClearanceSource.LastClearanceChangeDateUtc;
if (ccDate > _ClearanceVersionWithinFilterExpression)
{
_LocalFilterExpression = null;
_ClearanceVersionWithinFilterExpression = ccDate;
}
if (_LocalFilterExpression != null)
{
foreach (Type relatedType in _UpNavigations.Values)
{
if (EntityAccessControl.GetBuilderForEntity(relatedType).CheckLocalReBuildRequired(clearanceSource))
{
_LocalFilterExpression = null;
return(true);
}
}
}
return(_LocalFilterExpression == null);
}
/// <summary>
/// returns null when nothing to validate
/// </summary>
public Expression BuildUntypedFilterExpressionIncludingPrincipals(IClearanceSource clearanceSource, Expression entitySourceExpression = null)
{
if (entitySourceExpression == null)
{
//in default we can use the lamba-entry parameter (which is our entity)
entitySourceExpression = _EntityParameter;
//we get external expressions, when we are called to build expression for just a part of the graph
//in this case a member-expression which navigates from ou child up to us is passed via this arg...
}
Expression result = this.BuildUntypedLocalFilterExpression(clearanceSource, entitySourceExpression);
foreach (var nav in _UpNavigations)
{
String navPropName = nav.Key.Name;
Type parentEntityType = nav.Value;
MemberExpression targetEntityNavigationExpression = MemberExpression.Property(entitySourceExpression, navPropName);
var builderForParentEntityType = EntityAccessControl.GetBuilderForEntity(parentEntityType);
Expression targetFilterExpression = builderForParentEntityType.BuildUntypedFilterExpressionIncludingPrincipals(clearanceSource, targetEntityNavigationExpression);
//only when the nav has any filtering...
if (targetFilterExpression != null)
{
if (result == null)
{
result = targetFilterExpression;
}
else
{
result = Expression.AndAlso(result, targetFilterExpression);
}
}
}
//can be null!
return(result);
}