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Contents
module RDF
##
# An RDF blank node, also known as an anonymous or unlabeled node.
#
# @example Creating a blank node with an implicit identifier
# bnode = RDF::Node.new
#
# @example Creating a blank node with an UUID identifier
# bnode = RDF::Node.uuid
# bnode.to_s #=> "_:504c0a30-0d11-012d-3f50-001b63cac539"
#
# @see http://rubygems.org/gems/uuid
# @see http://rubygems.org/gems/uuidtools
class Node < Resource
##
# Returns a blank node with a random UUID-based identifier.
#
# @return [RDF::Node]
def self.uuid
begin
require 'uuid'
self.new(UUID.generate)
rescue LoadError => e
begin
require 'uuidtools'
self.new(UUIDTools::UUID.random_create)
rescue LoadError => e
raise LoadError.new("no such file to load -- uuid or uuidtools")
end
end
end
# @return [String]
attr_accessor :id
##
# @param [#to_s] id
def initialize(id = nil)
@id = (id || "g#{object_id}").to_s
end
##
# Returns `true`.
#
# @return [Boolean]
def node?
true
end
##
# Returns `true`.
#
# @return [Boolean]
def anonymous?
true
end
alias_method :unlabeled?, :anonymous?
##
# Returns `false`.
#
# @return [Boolean]
def labeled?
!unlabeled?
end
##
# Returns a string representation of this blank node.
#
# @return [String]
def to_s
"_:%s" % id.to_s
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems