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Contents
# frozen_string_literal: true
module Valkyrie::Persistence::Fedora
# Lazily iterates over a doubly linked list, fixing up nodes if necessary.
# Used for reading ordered members out of Fedora, and then converting them to
# member_ids.
class OrderedReader
include Enumerable
attr_reader :root
# @param root [Valkyrie::Persistence::Fedora::OrderedList]
def initialize(root)
@root = root
end
# Enumerates through each node in the RDF linked list
# @yield [Valkyrie::Persistence::Fedora::OrderedList::HeadSentinel, Valkyrie::Persistence::Fedora::ListNode]
def each
proxy = first_head
while proxy
yield proxy unless proxy.nil?
next_proxy = proxy.next
next_proxy.try(:prev=, proxy) if next_proxy&.prev != proxy
proxy = next_proxy
end
end
private
# Access the "first" (head) node for the linked list
# @return [Valkyrie::Persistence::Fedora::OrderedList::HeadSentinel]
def first_head
root.head
end
end
end
Version data entries
19 entries across 19 versions & 1 rubygems