If the Logging event level is within the specified range, then if
AcceptOnMatch is true, Filter.ACCEPT is returned, and if
AcceptOnMatch is false, Filter.NEUTRAL is returned.
If LevelMinw is not defined, then there is no
minimum acceptable level (ie a level is never rejected for
being too "low"/unimportant). If LevelMax is not
defined, then there is no maximum acceptable level (ie a
level is never rejected for beeing too "high"/important).
Refer to the setThreshold method
available to all appenders extending AppenderSkeleton for a more convenient way to
filter out events by level.
Simon Kitching, based on code by Ceki Gülcü
Fields inherited from class org.apache.log4j.spi.Filter