Class: Qa::LinkedData::Mapper::GraphLdpathMapperService

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

Class Method Summary collapse

Class Method Details

.map_values(graph:, ldpath_map:, subject_uri:, prefixes: {}) ⇒ <Hash<Symbol><Array<Object>>] mapped result values with hash of map key = array of object values identified by the ldpath map.

Extract values for ldpath specified in the ldpath_map from the graph and return as a value map for a single subject URI.

Examples:

prefixes

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

ldpath map

{
  uri: :subject_uri,
  id: 'locid:lccn :: xsd::string',
  label: 'skos:prefLabel :: xsd::string',
  altlabel: 'skos:altLabel :: xsd::string',
  sort: 'vivo:rank :: xsd::integer'
}

value map for a single result

{:uri=>[#<RDF::URI:0x3fcff54a829c URI:http://id.loc.gov/authorities/names/n2010043281>],
 :id=>[#<RDF::Literal:0x3fcff4a367b4("n2010043281")>],
 :label=>[#<RDF::Literal:0x3fcff54a9a98("Valli, Sabrina"@en)>],
 :altlabel=>[],
 :sort=>[#<RDF::Literal:0x3fcff54b4c18("2")>]}

Parameters:

  • graph (RDF::Graph) —

    the graph from which to extract result values

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

    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

  • subject_uri (RDF::URI) —

    the subject within the graph for which the values are being extracted

Returns:

  • (<Hash<Symbol><Array<Object>>] mapped result values with hash of map key = array of object values identified by the ldpath map.) —

    <Hash<Symbol><Array<Object>>] mapped result values with hash of map key = array of object values identified by the ldpath map.



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# File 'app/services/qa/linked_data/mapper/graph_ldpath_mapper_service.rb', line 35

def self.map_values(graph:, ldpath_map:, subject_uri:, prefixes: {})
  value_map = {}
  ldpath_map.each do |key, ldpath|
    next value_map[key] = [subject_uri] if ldpath == :subject_uri
    ldpath_program = ldpath_service.ldpath_program(ldpath: ldpath, prefixes: prefixes)
    values = ldpath_service.ldpath_evaluate(program: ldpath_program, graph: graph, subject_uri: subject_uri)
    value_map[key] = values
  end
  value_map = yield value_map if block_given?
  value_map
end