Class: Triannon::LdpToOaMapper
- Inherits:
-
Object
- Object
- Triannon::LdpToOaMapper
- Defined in:
- app/services/triannon/ldp_to_oa_mapper.rb
Instance Attribute Summary collapse
-
#id ⇒ Object
Returns the value of attribute id.
-
#oa_graph ⇒ Object
Returns the value of attribute oa_graph.
Class Method Summary collapse
-
.ldp_to_oa(ldp_anno) ⇒ Object
maps an AnnotationLdp to an OA RDF::Graph.
Instance Method Summary collapse
- #extract_base ⇒ Object
- #extract_bodies ⇒ Object
- #extract_targets ⇒ Object
-
#initialize(ldp_anno) ⇒ LdpToOaMapper
constructor
A new instance of LdpToOaMapper.
-
#map_choice(uri_obj, predicate) ⇒ Boolean
if uri_obj has a type of RDF::Vocab::OA.Choice, then this is a skolemized blank node; add appropriate statements to @oa_graph to represent the blank node and its contents and return true to be added to @oa_graph, e.g.
-
#map_content_as_text(uri_obj, predicate, subject_obj = @root_uri) ⇒ Boolean
if uri_obj has a type of RDF::Vocab::CNT.ContentAsText, then this is a skolemized blank node; add appropriate statements to @oa_graph to represent the blank node and its contents and return true to be added to @oa_graph, e.g.
-
#map_external_ref(uri_obj, predicate, subject_obj = @root_uri) ⇒ Boolean
if uri_obj is the subject of a Triannon.externalReference then add appropriate statements to @oa_graph and return true to be added to @oa_graph, e.g.
-
#map_specific_resource(uri_obj, predicate) ⇒ Boolean
if uri_obj has a type of RDF::Vocab::OA.SpecificResource, then this is a skolemized blank node; add appropriate statements to @oa_graph to represent the blank node and its contents and return true to be added to @oa_graph, e.g.
Constructor Details
#initialize(ldp_anno) ⇒ LdpToOaMapper
Returns a new instance of LdpToOaMapper.
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 15 def initialize ldp_anno @ldp_anno = ldp_anno @ldp_anno_graph = ldp_anno.stripped_graph g = RDF::Graph.new @oa_graph = OA::Graph.new g end |
Instance Attribute Details
#id ⇒ Object
Returns the value of attribute id.
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 13 def id @id end |
#oa_graph ⇒ Object
Returns the value of attribute oa_graph.
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 13 def oa_graph @oa_graph end |
Class Method Details
.ldp_to_oa(ldp_anno) ⇒ Object
maps an AnnotationLdp to an OA RDF::Graph
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 5 def self.ldp_to_oa ldp_anno mapper = Triannon::LdpToOaMapper.new ldp_anno mapper.extract_base mapper.extract_bodies mapper.extract_targets mapper.oa_graph end |
Instance Method Details
#extract_base ⇒ Object
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 22 def extract_base root_subject_solns = @ldp_anno_graph.query OA::Graph.anno_query if root_subject_solns.count == 1 stored_url = Triannon.config[:ldp]['url'].strip stored_url.chop! if stored_url.end_with?('/') container_path = Triannon.config[:ldp]['uber_container'] if container_path container_path.strip! container_path = container_path[1..-1] if container_path.start_with?('/') container_path.chop! if container_path.end_with?('/') stored_url = "#{stored_url}/#{container_path}" end @id = root_subject_solns[0].s.to_s.split("#{stored_url}/").last base_url = Triannon.config[:triannon_base_url] base_url.strip! base_url.chop! if base_url[-1] == '/' @root_uri = RDF::URI.new(base_url + "/#{@id}") end @ldp_anno_graph.each_statement do |stmnt| if stmnt.predicate == RDF.type && stmnt.object == RDF::Vocab::OA.Annotation @oa_graph << [@root_uri, RDF.type, RDF::Vocab::OA.Annotation] elsif stmnt.predicate == RDF::Vocab::OA.motivatedBy @oa_graph << [@root_uri, stmnt.predicate, stmnt.object] elsif stmnt.predicate == RDF::Vocab::OA.annotatedAt @oa_graph << [@root_uri, stmnt.predicate, stmnt.object] end end end |
#extract_bodies ⇒ Object
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 52 def extract_bodies @ldp_anno.body_uris.each { |body_uri| if !map_external_ref(body_uri, RDF::Vocab::OA.hasBody) && !map_content_as_text(body_uri, RDF::Vocab::OA.hasBody) && !map_specific_resource(body_uri, RDF::Vocab::OA.hasBody) map_choice(body_uri, RDF::Vocab::OA.hasBody) end } end |
#extract_targets ⇒ Object
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 62 def extract_targets @ldp_anno.target_uris.each { |target_uri| if !map_external_ref(target_uri, RDF::Vocab::OA.hasTarget) && !map_specific_resource(target_uri, RDF::Vocab::OA.hasTarget) map_choice(target_uri, RDF::Vocab::OA.hasTarget) end } end |
#map_choice(uri_obj, predicate) ⇒ Boolean
if uri_obj has a type of RDF::Vocab::OA.Choice, then this is a skolemized blank node;
add appropriate statements to @oa_graph to represent the blank node and its contents and return true
to be added to @oa_graph, e.g. RDF::Vocab::OA.hasTarget
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 183 def map_choice uri_obj, predicate solns = @ldp_anno_graph.query [uri_obj, RDF.type, RDF::Vocab::OA.Choice] if solns.count > 0 blank_node = RDF::Node.new @oa_graph << [@root_uri, predicate, blank_node] default_obj = nil item_objs = [] choice_stmts = OA::Graph.subject_statements(uri_obj, @ldp_anno_graph) choice_stmts.each { |stmt| if stmt.predicate == RDF::Vocab::OA.default default_obj = stmt.object # assume it is either ContentAsText or external ref if !map_content_as_text(default_obj, RDF::Vocab::OA.default, blank_node) map_external_ref(default_obj, RDF::Vocab::OA.default, blank_node) end elsif stmt.predicate == RDF::Vocab::OA.item item_objs << stmt.object # assume it is either ContentAsText or external ref if !map_content_as_text(stmt.object, RDF::Vocab::OA.item, blank_node) map_external_ref(stmt.object, RDF::Vocab::OA.item, blank_node) end end } # We can't know we'll hit item and default statements in graph first, # so we must do another pass through the statements to get that information choice_stmts.each { |stmt| if stmt.subject == uri_obj && stmt.object != default_obj && !item_objs.include?(stmt.object) @oa_graph << [blank_node, stmt.predicate, stmt.object] # there shouldn't be any other unmapped statements present end } true else false end end |
#map_content_as_text(uri_obj, predicate, subject_obj = @root_uri) ⇒ Boolean
if uri_obj has a type of RDF::Vocab::CNT.ContentAsText, then this is a skolemized blank node;
add appropriate statements to @oa_graph to represent the blank node and its contents and return true
to be added to @oa_graph, e.g. RDF::Vocab::OA.hasTarget
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 104 def map_content_as_text uri_obj, predicate, subject_obj = @root_uri solns = @ldp_anno_graph.query [uri_obj, RDF.type, RDF::Vocab::CNT.ContentAsText] if solns.count > 0 blank_node = RDF::Node.new @oa_graph << [subject_obj, predicate, blank_node] OA::Graph.subject_statements(uri_obj, @ldp_anno_graph).each { |stmt| if stmt.subject == uri_obj @oa_graph << [blank_node, stmt.predicate, stmt.object] else # it is a descendant statment - take as is @oa_graph << stmt end } true else false end end |
#map_external_ref(uri_obj, predicate, subject_obj = @root_uri) ⇒ Boolean
if uri_obj is the subject of a Triannon.externalReference then add appropriate
statements to @oa_graph and return true
to be added to @oa_graph, e.g. RDF::Vocab::OA.hasTarget
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 78 def map_external_ref uri_obj, predicate, subject_obj = @root_uri solns = @ldp_anno_graph.query [uri_obj, RDF::Triannon.externalReference, nil] if solns.count > 0 external_uri = solns.first.object @oa_graph << [subject_obj, predicate, external_uri] OA::Graph.subject_statements(uri_obj, @ldp_anno_graph).each { |stmt| if stmt.subject == uri_obj && stmt.predicate != RDF::Triannon.externalReference @oa_graph << [external_uri, stmt.predicate, stmt.object] else # we should never get here for external references ... end } true else false end end |
#map_specific_resource(uri_obj, predicate) ⇒ Boolean
if uri_obj has a type of RDF::Vocab::OA.SpecificResource, then this is a skolemized blank node;
add appropriate statements to @oa_graph to represent the blank node and its contents and return true
to be added to @oa_graph, e.g. RDF::Vocab::OA.hasTarget
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# File 'app/services/triannon/ldp_to_oa_mapper.rb', line 130 def map_specific_resource uri_obj, predicate solns = @ldp_anno_graph.query [uri_obj, RDF.type, RDF::Vocab::OA.SpecificResource] if solns.count > 0 blank_node = RDF::Node.new @oa_graph << [@root_uri, predicate, blank_node] source_obj = nil selector_obj = nil selector_blank_node = nil specific_res_stmts = OA::Graph.subject_statements(uri_obj, @ldp_anno_graph) specific_res_stmts.each { |stmt| if stmt.predicate == RDF::Vocab::OA.hasSource # expecting a hash URI source_obj = stmt.object if source_obj.to_s.match("#{uri_obj}#source") source_has_ext_uri = map_external_ref source_obj, RDF::Vocab::OA.hasSource, blank_node end elsif stmt.predicate == RDF::Vocab::OA.hasSelector # this becomes a blank node. Per http://www.openannotation.org/spec/core/specific.html#Selectors # "Typically if all of the information needed to resolve the Selector (or other Specifier) # is present within the graph, such as is the case for the # FragmentSelector, TextQuoteSelector, TextPositionSelector and DataPositionSelector classes, # then there is no need to have a resolvable resource that provides the same information." selector_obj = stmt.object selector_blank_node = RDF::Node.new @oa_graph << [blank_node, RDF::Vocab::OA.hasSelector, selector_blank_node] end } # We can't know we'll hit hasSource and hasSelector statements in graph first, # so we must do another pass through the statements to get that information specific_res_stmts.each { |stmt| if stmt.subject == uri_obj && stmt.object != source_obj && stmt.object != selector_obj @oa_graph << [blank_node, stmt.predicate, stmt.object] elsif stmt.subject != source_obj if selector_blank_node && stmt.subject == selector_obj @oa_graph << [selector_blank_node, stmt.predicate, stmt.object] end # there shouldn't be any other statements present end } true else false end end |