Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2011, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
Implementation of FilterAttachable.
Add a filter to end of the filter list.
Loop through the filters in the list. As soon as a filter decides on
ACCEPT or DENY, then that value is returned. If all of the filters return
NEUTRAL, then NEUTRAL is returned.