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Contents
#!/usr/bin/env ruby -w
# encoding: UTF-8
#
# = FitMessageIdMapper.rb -- Fit4Ruby - FIT file processing library for Ruby
#
# Copyright (c) 2014 by Chris Schlaeger <cs@taskjuggler.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
module Fit4Ruby
# The FIT file maps GlobalFitMessage numbers to local numbers. Due to
# restrictions in the format, only 16 local messages can be active at any
# point in the file. If a GlobalFitMessage is needed that is currently not
# mapped, a new entry is generated and the least recently used message is
# evicted. The FitMessageIdMapper is the objects that stores those 16 active
# entries and can map global to local message numbers.
class FitMessageIdMapper
# The entry in the mapper.
class Entry < Struct.new(:global_message, :last_use)
end
def initialize
@entries = Array.new(16, nil)
end
# Add a new GlobalFitMessage to the mapper and return the local message
# number.
def add_global(message)
unless (slot = @entries.index { |e| e.nil? })
# No more free slots. We have to find the least recently used one.
slot = 0
0.upto(15) do |i|
if i != slot && @entries[slot].last_use > @entries[i].last_use
slot = i
end
end
end
@entries[slot] = Entry.new(message, Time.now)
slot
end
# Get the local message number for a given GlobalFitMessage. If there is
# no message number, nil is returned.
def get_local(message)
0.upto(15) do |i|
if (entry = @entries[i]) && entry.global_message == message
entry.last_use = Time.now
return i
end
end
nil
end
end
end
Version data entries
35 entries across 35 versions & 1 rubygems