def self.create_from_hash(hash_class, namespace, name)
if hash_class == Digest::MD5
version = 3
elsif hash_class == Digest::SHA1
version = 5
else
raise ArgumentError,
"Expected Digest::SHA1 or Digest::MD5, got #{hash_class.name}."
end
hash = hash_class.new
hash.update(namespace.raw)
hash.update(name)
hash_string = hash.to_s[0..31]
new_uuid = self.parse("#{hash_string[0..7]}-#{hash_string[8..11]}-" +
"#{hash_string[12..15]}-#{hash_string[16..19]}-#{hash_string[20..31]}")
new_uuid.time_hi_and_version &= 0x0FFF
new_uuid.time_hi_and_version |= (version << 12)
new_uuid.clock_seq_hi_and_reserved &= 0x3F
new_uuid.clock_seq_hi_and_reserved |= 0x80
return new_uuid
end