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require 'set'
module Logging
module Filters
# The `Level` filter class provides a simple level-based filtering mechanism
# that allows events whose log level matches a preconfigured list of values.
class Level < ::Logging::Filter
# Creates a new level filter that will only allow the given _levels_ to
# propagate through to the logging destination. The _levels_ should be
# given in symbolic form.
#
# Examples
# Logging::Filters::Level.new(:debug, :info)
#
def initialize(*levels)
super()
levels = levels.flatten.map {|level| ::Logging::level_num(level)}
@levels = Set.new(levels)
end
# Returns the event if it should be forwarded to the logging appender.
# Otherwise, `nil` is returned. The log event is allowed if the
# `event.level` matches one of the levels provided to the filter when it
# was constructred.
def allow(event)
@levels.include?(event.level) ? event : nil
end
end
end
end
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