ruby/trema/ip.rb
#
# Copyright (C) 2008-2013 NEC Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2, 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
module Trema
#
# A wrapper class to IPAddr
#
class IP
require "ipaddr"
#
# @return [IPAddr] value object instance of proxied IPAddr.
#
attr_reader :value
#
# Creates a {IP} instance object as a proxy to IPAddr class.
#
# @overload initialize(addr)
#
# @param [String, Number] addr
# an IPv4 address specified either as a String or Number.
#
# @param [Number] prefixlen
# masking IPv4 address with given prefixlen.
#
# @raise [ArgumentError] invalid address if supplied argument is invalid
# IPv4 address.
#
# @return [IP] self
# a proxy to IPAddr.
#
def initialize addr, prefixlen = 32
if !addr.kind_of? String
@value = IPAddr.new( addr, Socket::AF_INET )
else
@value = IPAddr.new( addr )
end
if prefixlen < 32
@value = @value.mask( prefixlen )
end
end
#
# @return [ Number ] prefixlen of IPv4 address.
#
def prefixlen
range = @value.to_range
mask = range.first.to_i ^ range.last.to_i
masklen = 0
while mask != 0 do
mask = mask >> 1
masklen += 1
end
return 32 - masklen
end
#
# @return [String] the IPv4 address in its text representation.
#
def to_s
@value.to_s
end
#
# @return [Number] the IPv4 address in its numeric representation.
#
def to_i
@value.to_i
end
#
# @return [Array]
# an array of decimal numbers converted from IP address.
#
def to_a
to_s.split( "." ).collect do | each |
each.to_i
end
end
alias :to_array :to_a
end
end
### Local variables:
### mode: Ruby
### coding: utf-8-unix
### indent-tabs-mode: nil
### End: