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module Hydra::ContentNegotiation
# Replaces Fedora URIs in a graph with a Hydra-configured alternative.
class FedoraUriReplacer
# @param [String] fedora_base_uri the internal Fedora base uri
# @param [RDF::Graph] graph the original graph that needs URIs replaced
# @param [#call] replacer a function that is called with id and graph and returns a string representation of the new uri.
def initialize(fedora_base_uri, graph, replacer)
@fedora_base_uri = fedora_base_uri
@graph = graph
@replacer = replacer
end
def run
RDF::Graph.new.insert(*replaced_objects)
end
private
attr_reader :fedora_base_uri, :graph, :replacer
def replace_uri(uri)
id = ActiveFedora::Base.uri_to_id(uri)
RDF::URI(replacer.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
30 entries across 30 versions & 1 rubygems