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require 'set'
module Logging
module Filters
# The `Level` filter class provides a simple level-based filtering mechanism
# that filters messages to only include those from an enumerated list of
# levels to log.
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 )
levels = levels.map { |level| ::Logging::level_num(level) }
@levels = Set.new levels
end
def allow( event )
@levels.include?(event.level) ? event : nil
end
end
end
end
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