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 bool IsSubsetOf(IPermission target)
{
if (null == target)
{
return(IsEmpty());
}
if (target.GetType() != this.GetType())
{
throw ADP.PermissionTypeMismatch();
}
SqlClientPermission superset = (target as SqlClientPermission);
bool subset = superset.IsUnrestricted();
if (!subset)
{
if (!IsUnrestricted() &&
(!AllowBlankPassword || superset.AllowBlankPassword) &&
((null == _keyvalues) || (null != superset._keyvaluetree)))
{
subset = true;
if (null != _keyvalues)
{
foreach (DBConnectionString kventry in _keyvalues)
{
if (!superset._keyvaluetree.CheckValueForKeyPermit(kventry))
{
subset = false;
break;
}
}
}
}
}
return(subset);
}
