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Contents
module Hydra::ContentNegotiation
# Replaces Fedora URIs in a graph with a Hydra-configured alternative.
class FedoraUriReplacer
def initialize(fedora_base_uri, graph)
@fedora_base_uri = fedora_base_uri
@graph = graph
end
def run
RDF::Graph.new.insert(*replaced_objects)
end
private
attr_reader :fedora_base_uri, :graph
def replace_uri(uri)
id = ActiveFedora::Base.uri_to_id(uri)
RDF::URI(Hydra.config.id_to_resource_uri.call(id, graph))
end
def replaced_objects
replaced_subjects.map do |statement|
if fedora_uri?(statement.object)
RDF::Statement.from([statement.subject, statement.predicate, replace_uri(statement.object)])
else
statement
end
end
end
def fedora_uri?(subject)
subject.to_s.start_with?(fedora_base_uri.to_s)
end
def replaced_subjects
graph.each_statement.to_a.map do |s|
if fedora_uri?(s.subject)
RDF::Statement.from([replace_uri(s.subject), s.predicate, s.object])
else
s
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems