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Contents
module RDF
##
# @since 0.2.0
module Countable
extend RDF::Util::Aliasing::LateBound
# Extends Enumerator with {Countable}, which is used by {Countable#enum_for}
class Enumerator < ::Enumerator
include RDF::Countable
end
##
# Returns `true` if `self` contains no RDF statements.
#
# @return [Boolean]
def empty?
each {return false}
true
end
##
# Returns the number of RDF statements in `self`.
#
# @return [Integer]
def count
count = 0
each { count += 1 }
count
end
alias_method :size, :count
##
# @private
# @param [Symbol, #to_sym] method
# @return [Enumerator]
# @see Object#enum_for
def enum_for(method = :each, *args)
# Ensure that enumerators support the `#empty?` and `#count` methods:
this = self
Countable::Enumerator.new do |yielder|
this.send(method, *args) {|y| yielder << y}
end
end
alias_method :to_enum, :enum_for
end # Countable
end # RDF
Version data entries
12 entries across 12 versions & 1 rubygems