override public IPermission Union(IPermission target)
{
if (null == target)
{
return(this.Copy());
}
if (target.GetType() != this.GetType())
{
throw ADP.PermissionTypeMismatch();
}
if (IsUnrestricted())
{ // MDAC 84803
return(this.Copy());
}
SqlClientPermission newPermission = (SqlClientPermission)target.Copy();
if (!newPermission.IsUnrestricted())
{
newPermission.AllowBlankPassword |= AllowBlankPassword;
if (null != _keyvalues)
{
foreach (DBConnectionString entry in _keyvalues)
{
newPermission.AddPermissionEntry(entry);
}
}
}
return(newPermission.IsEmpty() ? null : newPermission);
}
override public IPermission Intersect(IPermission target)
{ // used during Deny actions
if (null == target)
{
return(null);
}
if (target.GetType() != this.GetType())
{
throw ADP.PermissionTypeMismatch();
}
if (this.IsUnrestricted())
{ // MDAC 84803, NDPWhidbey 29121
return(target.Copy());
}
DBDataPermission operand = (DBDataPermission)target;
if (operand.IsUnrestricted())
{ // NDPWhidbey 29121
return(this.Copy());
}
SqlClientPermission newPermission = (SqlClientPermission)operand.Copy();
newPermission.AllowBlankPassword &= AllowBlankPassword;
if ((null != _keyvalues) && (null != newPermission._keyvalues))
{
newPermission._keyvalues.Clear();
newPermission._keyvaluetree.Intersect(newPermission._keyvalues, _keyvaluetree);
}
else
{
// either target.Add or this.Add have not been called
// return a non-null object so IsSubset calls will fail
newPermission._keyvalues = null;
newPermission._keyvaluetree = null;
}
if (newPermission.IsEmpty())
{ // no intersection, MDAC 86773
newPermission = null;
}
return(newPermission);
}
