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module Logging
# The `Filter` class allows for filtering messages based on event
# properties independently of the standard minimum-level restriction.
#
# All other Filters inherit from this class, and must override the
# `allow` method to return the event if it should be allowed into the log.
# Otherwise the `allow` method should return `nil`.
class Filter
# Returns the event if it should be allowed into the log. Returns `nil` if
# the event should _not_ be allowed into the log. Subclasses should override
# this method and provide their own filtering semantics.
def allow( event )
event
end
end
end
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