# Copyright (C) 2008 10gen Inc.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License, version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
# for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

require 'mongo/util/uuid'

module XGen
  module Mongo
    module Driver

      class ObjectID

        UUID_STRING_LENGTH = 24

        @@uuid_generator = UUID.new

        # String UUID
        attr_reader :uuid

        # +uuid+ is a string. If nil, a new UUID will be generated.
        def initialize(uuid=nil)
          # The Babble server expects 12-byte (24 hex character) keys, which
          # is why we throw away part of the UUID.
          @uuid ||= @@uuid_generator.generate(:compact).sub(/(.{12}).{8}(.{12})/, '\1\2')
        end

        def to_s
          @uuid
        end
      end
    end
  end
end