Class: Qa::LinkedData::Mapper::TermResultsMapperService

Inherits:
Object
  • Object
show all
Defined in:
app/services/qa/linked_data/mapper/term_results_mapper_service.rb

Class Method Summary collapse

Class Method Details

.map_values(graph:, subject_uri:, prefixes: nil, ldpath_map: nil, predicate_map: nil) ⇒ Hash<Symbol><Array<Object>>

Extract predicates specified in the predicate_map from the graph and return as an array of value maps for each search result subject URI. If a sort key is present, a subject will only be included in the results if it has a statement with the sort predicate.

Examples:

prefixes

{
  locid: 'http://id.loc.gov/vocabulary/identifiers/',
  skos: 'http://www.w3.org/2004/02/skos/core#',
}

ldpath map

{
  uri: :subject_uri,
  id: 'locid:lccn :: xsd::string',
  label: 'skos:prefLabel :: xsd::string',
  altlabel: 'skos:altLabel :: xsd::string',
  broader:  'skos:broader :: xsd::anyURI',
  narrower: 'skos:narrower :: xsd::anyURI',
  sameas: 'skos:exactMatch :: xsd::anyURI'
}

predicate map

{
  uri: :subject_uri,
  id_predicate: 'http://id.loc.gov/vocabulary/identifiers/lccn',
  label_predicate: 'http://www.w3.org/2004/02/skos/core#prefLabel',
  altlabel_predicate: 'http://www.w3.org/2004/02/skos/core#altLabel',
  broader_predicate:  'http://www.w3.org/2004/02/skos/core#broader',
  narrower_predicate: 'http://www.w3.org/2004/02/skos/core#narrower',
  sameas_predicate: 'http://www.w3.org/2004/02/skos/core#exactMatch'
}

value map

[
  {:uri=>[#<RDF::URI:0x3fcff54a829c URI:http://id.loc.gov/authorities/genreForms/gf2011026559>],
   :id=>[#<RDF::Literal:0x3fcff4a367b4("gf2011026559")>],
   :label=>[#<RDF::Literal:0x3fcff54a9a98("Science Fiction"@en)>],
   :altlabel=>[#<RDF::Literal:0x3fcff54a9a98("Sci-fi"@en)>],
   :broader=>[#<RDF::URI:0x3fcff54a8234 URI:http://id.loc.gov/authorities/genreForms/gf2014026339>],
   :narrower=>[#<RDF::URI:0x3fcff54a8283 URI:http://id.loc.gov/authorities/genreForms/gf2014026551>],
   :sameas=>[#<RDF::URI:0x3fcff54a8248 URI:http://id.loc.gov/authorities/names/n2010043281>]}
]

Parameters:

  • graph (RDF::Graph) —

    the graph from which to extract result values

  • subject_uri (RDF::URI) —

    the uri of the term represented by the graph

  • prefixes (Hash<Symbol><String>) (defaults to: nil) —

    URL map of prefixes to use with ldpaths

  • ldpath (Hash<Symbol><String||Symbol>) —

    value either maps to a ldpath in the graph or is :subject_uri indicating to use the subject uri as the value

  • predicate_map (Hash<Symbol><String||Symbol>) (defaults to: nil) —

    value either maps to a predicate in the graph or is :subject_uri indicating to use the subject uri as the value

Returns:

  • (Hash<Symbol><Array<Object>>) —

    mapped result values for the term with hash of map key = array of object values for predicates identified in map parameter.



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# File 'app/services/qa/linked_data/mapper/term_results_mapper_service.rb', line 55

def map_values(graph:, subject_uri:, prefixes: nil, ldpath_map: nil, predicate_map: nil)
  if ldpath_map.present?
    map_values_with_ldpath_map(graph: graph, ldpath_map: ldpath_map, prefixes: prefixes, subject_uri: subject_uri)
  else
    map_values_with_predicate_map(graph: graph, predicate_map: predicate_map, subject_uri: subject_uri)
  end
end