class UUIDTools::UUID

UUIDTools was designed to be a simple library for generating any of the various types of UUIDs. It conforms to RFC 4122 whenever possible.

@example

UUID.md5_create(UUID_DNS_NAMESPACE, "www.widgets.com")
# => #<UUID:0x287576 UUID:3d813cbb-47fb-32ba-91df-831e1593ac29>
UUID.sha1_create(UUID_DNS_NAMESPACE, "www.widgets.com")
# => #<UUID:0x2a0116 UUID:21f7f8de-8051-5b89-8680-0195ef798b6a>
UUID.timestamp_create
# => #<UUID:0x2adfdc UUID:64a5189c-25b3-11da-a97b-00c04fd430c8>
UUID.random_create
# => #<UUID:0x19013a UUID:984265dc-4200-4f02-ae70-fe4f48964159>

Attributes

ifconfig_command[RW]
ifconfig_path_default[RW]
ip_command[RW]
ip_path_default[RW]
clock_seq_hi_and_reserved[RW]

Returns the value of attribute ‘clock_seq_hi_and_reserved`

clock_seq_low[RW]

Returns the value of attribute ‘clock_seq_low`

nodes[RW]

Returns the value of attribute ‘nodes`

time_hi_and_version[RW]

Returns the value of attribute ‘time_hi_and_version`

time_low[RW]

Returns the value of attribute ‘time_low`

time_mid[RW]

Returns the value of attribute ‘time_mid`

Public Class Methods

convert_byte_string_to_int(byte_string) click to toggle source

@api private

    # File lib/uuidtools.rb
768 def self.convert_byte_string_to_int(byte_string)
769   if byte_string.respond_to?(:force_encoding)
770     byte_string.force_encoding(Encoding::ASCII_8BIT)
771   end
772 
773   integer = 0
774   size = byte_string.size
775   if byte_string[0].respond_to? :ord
776     for i in 0...size
777       integer += (byte_string[i].ord << (((size - 1) - i) * 8))
778     end
779   else
780     for i in 0...size
781       integer += (byte_string[i] << (((size - 1) - i) * 8))
782     end
783   end
784   
785   return integer
786 end
convert_int_to_byte_string(integer, size) click to toggle source

@api private

    # File lib/uuidtools.rb
755 def self.convert_int_to_byte_string(integer, size)
756   byte_string = ""
757   if byte_string.respond_to?(:force_encoding)
758     byte_string.force_encoding(Encoding::ASCII_8BIT)
759   end
760   size.times do |i|
761     byte_string << ((integer >> (((size - 1) - i) * 8)) & 0xFF)
762   end
763   return byte_string
764 end
create_from_hash(hash_class, namespace, name) click to toggle source

Creates a new UUID from a SHA1 or MD5 hash

@api private

    # File lib/uuidtools.rb
730 def self.create_from_hash(hash_class, namespace, name)
731   if hash_class == Digest::MD5
732     version = 3
733   elsif hash_class == Digest::SHA1
734     version = 5
735   else
736     raise ArgumentError,
737       "Expected Digest::SHA1 or Digest::MD5, got #{hash_class.name}."
738   end
739   hash = hash_class.new
740   hash.update(namespace.raw)
741   hash.update(name)
742   hash_string = hash.to_s[0..31]
743   new_uuid = self.parse("#{hash_string[0..7]}-#{hash_string[8..11]}-" +
744     "#{hash_string[12..15]}-#{hash_string[16..19]}-#{hash_string[20..31]}")
745 
746   new_uuid.time_hi_and_version &= 0x0FFF
747   new_uuid.time_hi_and_version |= (version << 12)
748   new_uuid.clock_seq_hi_and_reserved &= 0x3F
749   new_uuid.clock_seq_hi_and_reserved |= 0x80
750   return new_uuid
751 end
first_mac(instring) click to toggle source

Match and return the first Mac address found

    # File lib/uuidtools.rb
649 def self.first_mac(instring)
650   mac_regexps = [
651     Regexp.new("address:? (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"),
652     Regexp.new("addr:? (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"),
653     Regexp.new("ether:? (#{(["[0-9a-fA-F]{1,2}"] * 6).join(":")})"),
654     Regexp.new("HWaddr:? (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"),
655     Regexp.new("link/ether? (#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"),
656     Regexp.new("(#{(["[0-9a-fA-F]{2}"] * 6).join(":")})"),
657     Regexp.new("(#{(["[0-9a-fA-F]{2}"] * 6).join("-")})")
658   ]
659   parse_mac = lambda do |output|
660     (mac_regexps.map do |regexp|
661        result = output[regexp, 1]
662        result.downcase.gsub(/-/, ":") if result != nil
663     end).compact.first
664   end
665 
666   mac = parse_mac.call(instring)
667   if mac
668     # expand octets that were compressed (solaris)
669     return (mac.split(':').map do |octet|
670       (octet.length == 1 ? "0#{octet}" : octet)
671     end).join(':')
672   else
673     return nil
674   end
675 end
ifconfig(all=nil) click to toggle source

Call the ifconfig or ip command that is found

    # File lib/uuidtools.rb
633 def self.ifconfig(all=nil)
634   # find the path of the ifconfig command
635   ifconfig_path = UUID.ifconfig_path
636 
637   # if it does not exist, try the ip command
638   if ifconfig_path == nil
639     ifconfig_path = "#{UUID.ip_path} addr list"
640     # all makes no sense when using ip(1)
641     all = nil
642   end
643 
644   all_switch = all == nil ? "" : "-a"
645   return `#{ifconfig_path} #{all_switch}` if not ifconfig_path == nil
646 end
ifconfig_path() click to toggle source

Find the path of the ifconfig(8) command if it is present

    # File lib/uuidtools.rb
615 def self.ifconfig_path
616   path = `which #{UUID.ifconfig_command} 2>/dev/null`.strip
617   path = UUID.ifconfig_path_default if (path == "" && File.exist?(UUID.ifconfig_path_default))
618   return (path === "" ? nil : path)
619 end
ip_path() click to toggle source

Find the path of the ip(8) command if it is present

    # File lib/uuidtools.rb
624 def self.ip_path
625   path = `which #{UUID.ip_command} 2>/dev/null`.strip
626   path = UUID.ip_path_default if (path == "" && File.exist?(UUID.ip_path_default))
627   return (path === "" ? nil : path)
628 end
mac_address() click to toggle source

Returns the MAC address of the current computer’s network card. Returns nil if a MAC address could not be found.

    # File lib/uuidtools.rb
680 def self.mac_address
681   if !defined?(@@mac_address)
682     require 'rbconfig'
683 
684     os_class = UUID.os_class
685 
686     if os_class == :windows
687       begin
688         @@mac_address = UUID.first_mac `ipconfig /all`
689       rescue
690       end
691     else # linux, bsd, macos, solaris
692       @@mac_address = UUID.first_mac(UUID.ifconfig(:all))
693     end
694 
695     if @@mac_address != nil
696       if @@mac_address.respond_to?(:to_str)
697         @@mac_address = @@mac_address.to_str
698       else
699         @@mac_address = @@mac_address.to_s
700       end
701       @@mac_address.downcase!
702       @@mac_address.strip!
703     end
704 
705     # Verify that the MAC address is in the right format.
706     # Nil it out if it isn't.
707     unless @@mac_address.respond_to?(:scan) &&
708         @@mac_address.scan(/#{(["[0-9a-f]{2}"] * 6).join(":")}/)
709       @@mac_address = nil
710     end
711   end
712   return @@mac_address
713 end
mac_address=(new_mac_address) click to toggle source

Allows users to set the MAC address manually in cases where the MAC address cannot be obtained programatically.

    # File lib/uuidtools.rb
718 def self.mac_address=(new_mac_address)
719   @@mac_address = new_mac_address
720 end
md5_create(namespace, name) click to toggle source

Creates a UUID using the MD5 hash. (Version 3)

    # File lib/uuidtools.rb
347 def self.md5_create(namespace, name)
348   return self.create_from_hash(Digest::MD5, namespace, name)
349 end
new(time_low, time_mid, time_hi_and_version, clock_seq_hi_and_reserved, clock_seq_low, nodes) click to toggle source

Creates a new UUID structure from its component values. @see UUID.md5_create @see UUID.sha1_create @see UUID.timestamp_create @see UUID.random_create @api private

    # File lib/uuidtools.rb
 80 def initialize(time_low, time_mid, time_hi_and_version,
 81     clock_seq_hi_and_reserved, clock_seq_low, nodes)
 82   unless time_low >= 0 && time_low < 4294967296
 83     raise ArgumentError,
 84       "Expected unsigned 32-bit number for time_low, got #{time_low}."
 85   end
 86   unless time_mid >= 0 && time_mid < 65536
 87     raise ArgumentError,
 88       "Expected unsigned 16-bit number for time_mid, got #{time_mid}."
 89   end
 90   unless time_hi_and_version >= 0 && time_hi_and_version < 65536
 91     raise ArgumentError,
 92       "Expected unsigned 16-bit number for time_hi_and_version, " +
 93       "got #{time_hi_and_version}."
 94   end
 95   unless clock_seq_hi_and_reserved >= 0 && clock_seq_hi_and_reserved < 256
 96     raise ArgumentError,
 97       "Expected unsigned 8-bit number for clock_seq_hi_and_reserved, " +
 98       "got #{clock_seq_hi_and_reserved}."
 99   end
100   unless clock_seq_low >= 0 && clock_seq_low < 256
101     raise ArgumentError,
102       "Expected unsigned 8-bit number for clock_seq_low, " +
103       "got #{clock_seq_low}."
104   end
105   unless nodes.kind_of?(Enumerable)
106     raise TypeError,
107       "Expected Enumerable, got #{nodes.class.name}."
108   end
109   unless nodes.size == 6
110     raise ArgumentError,
111       "Expected nodes to have size of 6."
112   end
113   for node in nodes
114     unless node >= 0 && node < 256
115       raise ArgumentError,
116         "Expected unsigned 8-bit number for each node, " +
117         "got #{node}."
118     end
119   end
120   @time_low = time_low
121   @time_mid = time_mid
122   @time_hi_and_version = time_hi_and_version
123   @clock_seq_hi_and_reserved = clock_seq_hi_and_reserved
124   @clock_seq_low = clock_seq_low
125   @nodes = nodes
126 end
os_class() click to toggle source

Determine what OS we’re running on. Helps decide how to find the MAC

    # File lib/uuidtools.rb
585 def self.os_class
586   require 'rbconfig'
587   os_platform = RbConfig::CONFIG['target_os']
588   os_class = nil
589   if (os_platform =~ /win/i && !(os_platform =~ /darwin/i)) ||
590       os_platform =~ /w32/i
591     os_class = :windows
592   elsif os_platform =~ /solaris/i
593     os_class = :solaris
594   elsif os_platform =~ /netbsd/i
595     os_class = :netbsd
596   elsif os_platform =~ /openbsd/i
597     os_class = :openbsd
598   end
599 end
parse(uuid_string) click to toggle source

Parses a UUID from a string.

    # File lib/uuidtools.rb
154 def self.parse(uuid_string)
155   unless uuid_string.kind_of? String
156     raise TypeError,
157       "Expected String, got #{uuid_string.class.name} instead."
158   end
159   uuid_components = uuid_string.downcase.scan(UUIDTools::UUID_REGEXP).first
160   raise ArgumentError, "Invalid UUID format." if uuid_components.nil?
161   time_low = uuid_components[0].to_i(16)
162   time_mid = uuid_components[1].to_i(16)
163   time_hi_and_version = uuid_components[2].to_i(16)
164   clock_seq_hi_and_reserved = uuid_components[3].to_i(16)
165   clock_seq_low = uuid_components[4].to_i(16)
166   nodes = []
167   6.times do |i|
168     nodes << uuid_components[5][(i * 2)..(i * 2) + 1].to_i(16)
169   end
170   return self.new(time_low, time_mid, time_hi_and_version,
171     clock_seq_hi_and_reserved, clock_seq_low, nodes)
172 end
parse_hexdigest(uuid_hex) click to toggle source

Parse a UUID from a hexdigest String.

    # File lib/uuidtools.rb
253 def self.parse_hexdigest(uuid_hex)
254   unless uuid_hex.kind_of?(String)
255     raise ArgumentError,
256       "Expected String, got #{uuid_hex.class.name} instead."
257   end
258 
259   time_low = uuid_hex[0...8].to_i(16)
260   time_mid = uuid_hex[8...12].to_i(16)
261   time_hi_and_version = uuid_hex[12...16].to_i(16)
262   clock_seq_hi_and_reserved = uuid_hex[16...18].to_i(16)
263   clock_seq_low = uuid_hex[18...20].to_i(16)
264   nodes_string = uuid_hex[20...32]
265   nodes = []
266   for i in 0..5
267     nodes << nodes_string[(i * 2)..(i * 2) + 1].to_i(16)
268   end
269 
270   return self.new(time_low, time_mid, time_hi_and_version,
271                   clock_seq_hi_and_reserved, clock_seq_low, nodes)
272 end
parse_int(uuid_int) click to toggle source

Parses a UUID from an Integer.

    # File lib/uuidtools.rb
231 def self.parse_int(uuid_int)
232   unless uuid_int.kind_of?(Integer)
233     raise ArgumentError,
234       "Expected Integer, got #{uuid_int.class.name} instead."
235   end
236 
237   time_low = (uuid_int >> 96) & 0xFFFFFFFF
238   time_mid = (uuid_int >> 80) & 0xFFFF
239   time_hi_and_version = (uuid_int >> 64) & 0xFFFF
240   clock_seq_hi_and_reserved = (uuid_int >> 56) & 0xFF
241   clock_seq_low = (uuid_int >> 48) & 0xFF
242   nodes = []
243   for i in 0..5
244     nodes << ((uuid_int >> (40 - (i * 8))) & 0xFF)
245   end
246 
247   return self.new(time_low, time_mid, time_hi_and_version,
248                   clock_seq_hi_and_reserved, clock_seq_low, nodes)
249 end
parse_raw(raw_string) click to toggle source

Parses a UUID from a raw byte string.

    # File lib/uuidtools.rb
176 def self.parse_raw(raw_string)
177   unless raw_string.kind_of? String
178     raise TypeError,
179       "Expected String, got #{raw_string.class.name} instead."
180   end
181 
182   if raw_string.respond_to?(:force_encoding)
183     raw_string.force_encoding(Encoding::ASCII_8BIT)
184   end
185 
186   raw_length = raw_string.length
187   if raw_length < 16
188     # Option A: Enforce raw_string be 16 characters (More strict)
189     #raise ArgumentError,
190     #  "Expected 16 bytes, got #{raw_string.length} instead."
191 
192     # Option B: Pad raw_string to 16 characters (Compatible with existing behavior)
193     raw_string = raw_string.rjust(16, "\0")
194   elsif raw_length > 16
195     # NOTE: As per "Option B" above, existing behavior would use the lower
196     # 128-bits of an overly long raw_string instead of using the upper 128-bits.
197     start_index = raw_length - 16
198     raw_string = raw_string[start_index...raw_length]
199   end
200 
201   raw_bytes = []
202   if raw_string[0].respond_to? :ord
203     for i in 0...raw_string.size
204       raw_bytes << raw_string[i].ord
205     end
206   else
207     raw_bytes = raw_string
208   end
209 
210   time_low = ((raw_bytes[0] << 24) +
211               (raw_bytes[1] << 16)  +
212               (raw_bytes[2] << 8)  +
213                raw_bytes[3])
214   time_mid = ((raw_bytes[4] << 8) +
215                raw_bytes[5])
216   time_hi_and_version = ((raw_bytes[6] << 8) +
217                           raw_bytes[7])
218   clock_seq_hi_and_reserved = raw_bytes[8]
219   clock_seq_low = raw_bytes[9]
220   nodes = []
221   for i in 10...16
222     nodes << raw_bytes[i]
223   end
224 
225   return self.new(time_low, time_mid, time_hi_and_version,
226                   clock_seq_hi_and_reserved, clock_seq_low, nodes)
227 end
random_create() click to toggle source

Creates a UUID from a random value.

    # File lib/uuidtools.rb
276 def self.random_create()
277   new_uuid = self.parse_raw(SecureRandom.random_bytes(16))
278   new_uuid.time_hi_and_version &= 0x0FFF
279   new_uuid.time_hi_and_version |= (4 << 12)
280   new_uuid.clock_seq_hi_and_reserved &= 0x3F
281   new_uuid.clock_seq_hi_and_reserved |= 0x80
282   return new_uuid
283 end
sha1_create(namespace, name) click to toggle source

Creates a UUID using the SHA1 hash. (Version 5)

    # File lib/uuidtools.rb
353 def self.sha1_create(namespace, name)
354   return self.create_from_hash(Digest::SHA1, namespace, name)
355 end
timestamp_create(timestamp=nil) click to toggle source

Creates a UUID from a timestamp.

    # File lib/uuidtools.rb
287 def self.timestamp_create(timestamp=nil)
288   # We need a lock here to prevent two threads from ever
289   # getting the same timestamp.
290   @@mutex.synchronize do
291     # Always use GMT to generate UUIDs.
292     if timestamp.nil?
293       gmt_timestamp = Time.now.gmtime
294     else
295       gmt_timestamp = timestamp.gmtime
296     end
297     # Convert to 100 nanosecond blocks
298     gmt_timestamp_100_nanoseconds = (gmt_timestamp.tv_sec * 10000000) +
299       (gmt_timestamp.tv_usec * 10) + 0x01B21DD213814000
300     mac_address = self.mac_address
301     node_id = 0
302     if mac_address != nil
303       nodes = mac_address.split(":").collect do |octet|
304         octet.to_i(16)
305       end
306     else
307       nodes = SecureRandom.random_bytes(6).unpack("C*")
308       nodes[0] |= 0b00000001
309     end
310     6.times do |i|
311       node_id += (nodes[i] << (40 - (i * 8)))
312     end
313     clock_sequence = @@last_clock_sequence
314     if clock_sequence.nil?
315       clock_sequence = self.convert_byte_string_to_int(
316         SecureRandom.random_bytes(16)
317       )
318     end
319     if @@last_node_id != nil && @@last_node_id != node_id
320       # The node id has changed.  Change the clock id.
321       clock_sequence = self.convert_byte_string_to_int(
322         SecureRandom.random_bytes(16)
323       )
324     elsif @@last_timestamp != nil &&
325         gmt_timestamp_100_nanoseconds <= @@last_timestamp
326       clock_sequence = clock_sequence + 1
327     end
328     @@last_timestamp = gmt_timestamp_100_nanoseconds
329     @@last_node_id = node_id
330     @@last_clock_sequence = clock_sequence
331 
332     time_low = gmt_timestamp_100_nanoseconds & 0xFFFFFFFF
333     time_mid = ((gmt_timestamp_100_nanoseconds >> 32) & 0xFFFF)
334     time_hi_and_version = ((gmt_timestamp_100_nanoseconds >> 48) & 0x0FFF)
335     time_hi_and_version |= (1 << 12)
336     clock_seq_low = clock_sequence & 0xFF;
337     clock_seq_hi_and_reserved = (clock_sequence & 0x3F00) >> 8
338     clock_seq_hi_and_reserved |= 0x80
339 
340     return self.new(time_low, time_mid, time_hi_and_version,
341       clock_seq_hi_and_reserved, clock_seq_low, nodes)
342   end
343 end

Public Instance Methods

<=>(other_uuid) click to toggle source

Compares two UUIDs lexically

    # File lib/uuidtools.rb
453 def <=>(other_uuid)
454   return nil unless other_uuid.is_a?(UUIDTools::UUID)
455   check = self.time_low <=> other_uuid.time_low
456   return check if check != 0
457   check = self.time_mid <=> other_uuid.time_mid
458   return check if check != 0
459   check = self.time_hi_and_version <=> other_uuid.time_hi_and_version
460   return check if check != 0
461   check = self.clock_seq_hi_and_reserved <=>
462     other_uuid.clock_seq_hi_and_reserved
463   return check if check != 0
464   check = self.clock_seq_low <=> other_uuid.clock_seq_low
465   return check if check != 0
466   6.times do |i|
467     if (self.nodes[i] < other_uuid.nodes[i])
468       return -1
469     end
470     if (self.nodes[i] > other_uuid.nodes[i])
471       return 1
472     end
473   end
474   return 0
475 end
eql?(other) click to toggle source

Returns true if this UUID is exactly equal to the other UUID.

    # File lib/uuidtools.rb
578 def eql?(other)
579   return self == other
580 end
hash() click to toggle source

Returns an integer hash value.

    # File lib/uuidtools.rb
518 def hash
519   self.frozen? ? generate_hash : (@hash ||= generate_hash)
520 end
hexdigest() click to toggle source

Returns the hex digest of the UUID object.

    # File lib/uuidtools.rb
485 def hexdigest
486   (self.frozen? ?
487     generate_hexdigest : (@hexdigest ||= generate_hexdigest)
488   ).dup
489 end
inspect() click to toggle source

Returns a representation of the object’s state

    # File lib/uuidtools.rb
479 def inspect
480   return "#<UUID:0x#{self.object_id.to_s(16)} UUID:#{self.to_s}>"
481 end
mac_address() click to toggle source

Returns the IEEE 802 address used to generate this UUID or nil if a MAC address was not used.

    # File lib/uuidtools.rb
430 def mac_address
431   return nil if self.version != 1
432   return nil if self.random_node_id?
433   return (self.nodes.collect do |node|
434     sprintf("%2.2x", node)
435   end).join(":")
436 end
nil_uuid?() click to toggle source

Returns true if this UUID is the nil UUID (00000000-0000-0000-0000-000000000000).

    # File lib/uuidtools.rb
372 def nil_uuid?
373   return false if self.time_low != 0
374   return false if self.time_mid != 0
375   return false if self.time_hi_and_version != 0
376   return false if self.clock_seq_hi_and_reserved != 0
377   return false if self.clock_seq_low != 0
378   self.nodes.each do |node|
379     return false if node != 0
380   end
381   return true
382 end
random_node_id?() click to toggle source

This method applies only to version 1 UUIDs. Checks if the node ID was generated from a random number or from an IEEE 802 address (MAC address). Always returns false for UUIDs that aren’t version 1. This should not be confused with version 4 UUIDs where more than just the node id is random.

    # File lib/uuidtools.rb
364 def random_node_id?
365   return false if self.version != 1
366   return ((self.nodes.first & 0x01) == 1)
367 end
raw() click to toggle source

Returns the raw bytes that represent this UUID.

    # File lib/uuidtools.rb
493 def raw
494   (self.frozen? ? generate_raw : (@raw ||= generate_raw)).dup
495 end
timestamp() click to toggle source

Returns the timestamp used to generate this UUID

    # File lib/uuidtools.rb
440 def timestamp
441   return nil if self.version != 1
442   gmt_timestamp_100_nanoseconds = 0
443   gmt_timestamp_100_nanoseconds +=
444     ((self.time_hi_and_version  & 0x0FFF) << 48)
445   gmt_timestamp_100_nanoseconds += (self.time_mid << 32)
446   gmt_timestamp_100_nanoseconds += self.time_low
447   return Time.at(
448     (gmt_timestamp_100_nanoseconds - 0x01B21DD213814000) / 10000000.0)
449 end
to_i() click to toggle source

Returns an integer representation for this UUID.

    # File lib/uuidtools.rb
506 def to_i
507   self.frozen? ? generate_i : (@integer ||= generate_i)
508 end
to_s() click to toggle source

Returns a string representation for this UUID.

    # File lib/uuidtools.rb
499 def to_s
500   (self.frozen? ? generate_s : (@string ||= generate_s)).dup
501 end
Also aliased as: to_str
to_str()
Alias for: to_s
to_uri() click to toggle source

Returns a URI string for this UUID.

    # File lib/uuidtools.rb
512 def to_uri
513   return "urn:uuid:#{self.to_s}"
514 end
valid?() click to toggle source

Returns true if this UUID is valid.

    # File lib/uuidtools.rb
418 def valid?
419   if [0b000, 0b100, 0b110, 0b111].include?(self.variant) &&
420     (1..5).include?(self.version)
421     return true
422   else
423     return false
424   end
425 end
variant() click to toggle source

Returns the UUID variant. Possible values: 0b000 - Reserved, NCS backward compatibility. 0b100 - The variant specified in this document. 0b110 - Reserved, Microsoft Corporation backward compatibility. 0b111 - Reserved for future definition.

    # File lib/uuidtools.rb
403 def variant
404   variant_raw = (clock_seq_hi_and_reserved >> 5)
405   result = nil
406   if (variant_raw >> 2) == 0
407     result = 0x000
408   elsif (variant_raw >> 1) == 2
409     result = 0x100
410   else
411     result = variant_raw
412   end
413   return (result >> 6)
414 end
version() click to toggle source

Returns the UUID version type. Possible values: 1 - Time-based with unique or random host identifier 2 - DCE Security version (with POSIX UIDs) 3 - Name-based (MD5 hash) 4 - Random 5 - Name-based (SHA-1 hash)

    # File lib/uuidtools.rb
392 def version
393   return (time_hi_and_version >> 12)
394 end

Protected Instance Methods

generate_hash() click to toggle source

Generates an integer hash value.

@api private

    # File lib/uuidtools.rb
534 def generate_hash
535   return self.to_i % 0x3fffffff
536 end
generate_hexdigest() click to toggle source

Generates the hex digest of the UUID object.

@api private

    # File lib/uuidtools.rb
527 def generate_hexdigest
528   return self.to_i.to_s(16).rjust(32, "0")
529 end
generate_i() click to toggle source

Generates an integer representation for this UUID.

@api private

    # File lib/uuidtools.rb
542 def generate_i
543   return (begin
544     bytes = (time_low << 96) + (time_mid << 80) +
545       (time_hi_and_version << 64) + (clock_seq_hi_and_reserved << 56) +
546       (clock_seq_low << 48)
547     6.times do |i|
548       bytes += (nodes[i] << (40 - (i * 8)))
549     end
550     bytes
551   end)
552 end
generate_raw() click to toggle source

Generates the raw bytes that represent this UUID.

@api private

    # File lib/uuidtools.rb
571 def generate_raw
572   return self.class.convert_int_to_byte_string(self.to_i, 16)
573 end
generate_s() click to toggle source

Generates a string representation for this UUID.

@api private

    # File lib/uuidtools.rb
558 def generate_s
559   result = sprintf("%8.8x-%4.4x-%4.4x-%2.2x%2.2x-", @time_low, @time_mid,
560     @time_hi_and_version, @clock_seq_hi_and_reserved, @clock_seq_low);
561   6.times do |i|
562     result << sprintf("%2.2x", @nodes[i])
563   end
564   return result.downcase
565 end