Class: Mei::Loc

Inherits:
Object
  • Object
show all
Includes:
WebServiceBase
Defined in:
lib/mei/loc.rb

Instance Attribute Summary

Attributes included from WebServiceBase

#raw_response

Class Method Summary collapse

Instance Method Summary collapse

Methods included from WebServiceBase

#get_json, #get_xml, #request_options

Constructor Details

#initialize(subauthority, solr_field) ⇒ Loc

Returns a new instance of Loc.



44
45
46
47
48
 
# File 'lib/mei/loc.rb', line 44

def initialize(subauthority, solr_field)
  @subauthority = subauthority
  @solr_field = solr_field
  #RestClient.enable Rack::Cache
end

Class Method Details

.app_root ⇒ Object 



17
18
19
20
21
22
 
# File 'lib/mei/loc.rb', line 17

def self.app_root
  return @app_root if @app_root
  @app_root = Rails.root if defined?(Rails) and defined?(Rails.root)
  @app_root ||= APP_ROOT if defined?(APP_ROOT)
  @app_root ||= '.'
end

.env ⇒ Object 



24
25
26
27
28
29
30
 
# File 'lib/mei/loc.rb', line 24

def self.env
  return @env if @env
  #The following commented line always returns "test" in a rails c production console. Unsure of how to fix this yet...
  #@env = ENV["RAILS_ENV"] = "test" if ENV
  @env ||= Rails.env if defined?(Rails) and defined?(Rails.root)
  @env ||= 'development'
end

.ldf_config ⇒ Object 



12
13
14
15
 
# File 'lib/mei/loc.rb', line 12

def self.ldf_config
  @ldf_config ||= YAML::load(File.open(ldf_config_path))[env]
                             .with_indifferent_access
end

.ldf_config_path ⇒ Object 



32
33
34
 
# File 'lib/mei/loc.rb', line 32

def self.ldf_config_path
  File.join(app_root, 'config', 'mei.yml')
end

.pop_graph(value) ⇒ Object 



8
9
10
 
# File 'lib/mei/loc.rb', line 8

def self.pop_graph(value)
  RDF::Graph.load("#{Mei::Loc.ldf_config[:ldf_server]}#{value}.ttl", format: :ttl)
end

.qskos(value) ⇒ Object 



36
37
38
39
40
41
42
 
# File 'lib/mei/loc.rb', line 36

def self.qskos value
  if value.match(/^sh\d+/)
    return ::RDF::URI.new("http://id.loc.gov/authorities/subjects/#{value}")
  else
    return ::RDF::URI.new("http://www.w3.org/2004/02/skos/core##{value}")
  end
end

Instance Method Details

#build_query_url(q) ⇒ Object 



56
57
58
59
60
 
# File 'lib/mei/loc.rb', line 56

def build_query_url q
  escaped_query = URI.escape(q)
  authority_fragment = Qa::Authorities::Loc.get_url_for_authority(@subauthority) + URI.escape(@subauthority)
  return "http://id.loc.gov/search/?q=#{escaped_query}&q=#{authority_fragment}&format=json"
end

#get_skos_concepts(subject) ⇒ Object 



136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
 
# File 'lib/mei/loc.rb', line 136

def get_skos_concepts subject
  broader_list = []
  narrower_list = []
  variant_list = []

  #xml_response = Nokogiri::XML(response).remove_namespaces!

  repo = pop_graph(subject)
  repo.query(:subject=>::RDF::URI.new(subject), :predicate=>Mei::Loc.qskos('broader')).each_statement do |result_statement|
    if !result_statement.object.literal? and result_statement.object.uri?
      broader_label = nil
      broader_uri = result_statement.object.to_s
      #if Mei::Loc.repo.query(:subject=>::RDF::URI.new(broader_uri), :predicate=>Mei::Loc.qskos('narrower'), :object=>::RDF::URI.new(subject)).count > 0
      valid = false

      broader_repo = pop_graph(broader_uri)
      broader_repo.query(:subject=>::RDF::URI.new(broader_uri)).each_statement do |broader_statement|
        if broader_statement.predicate.to_s == Mei::Loc.qskos('prefLabel')
          broader_label ||= broader_statement.object.value if broader_statement.object.literal?
        end

        if broader_statement.predicate.to_s == Mei::Loc.qskos('member')
          valid = true if broader_statement.object.to_s == 'http://id.loc.gov/authorities/subjects/collection_LCSHAuthorizedHeadings'
        end
      end
      broader_label ||= broader_uri
      broader_list << {:uri_link=>broader_uri, :label=>broader_label} if valid
      #end
    end
  end

  puts 'pre-a'
  repo.query(:subject=>::RDF::URI.new(subject), :predicate=>Mei::Loc.qskos('narrower')).each_statement do |result_statement|
    puts 'a'
    if !result_statement.object.literal? and result_statement.object.uri?
      narrower_label = nil
      narrower_uri = result_statement.object.to_s
      valid = false

      narrower_repo = pop_graph(narrower_uri)
      puts 'b'
      puts narrower_uri
      narrower_repo.query(:subject=>::RDF::URI.new(narrower_uri)).each_statement do |narrower_statement|
        if narrower_statement.predicate.to_s == Mei::Loc.qskos('prefLabel')
          narrower_label ||= narrower_statement.object.value if narrower_statement.object.literal?
        end

        if narrower_statement.predicate.to_s == Mei::Loc.qskos('member')
          valid = true if narrower_statement.object.to_s == 'http://id.loc.gov/authorities/subjects/collection_LCSHAuthorizedHeadings'
        end
      end
      narrower_label ||= narrower_uri
      narrower_list << {:uri_link=>narrower_uri, :label=>narrower_label} if valid
    end
  end

  repo.query(:subject=>::RDF::URI.new(subject), :predicate=>Mei::Loc.qskos('altLabel')).each_statement do |result_statement|
    variant_list << result_statement.object.value if result_statement.object.literal?
  end

  return broader_list, narrower_list, variant_list
end

#loc_response_to_qa(data, counter) ⇒ Object

Simple conversion from LoC-based struct to QA hash



82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
 
# File 'lib/mei/loc.rb', line 82

def loc_response_to_qa(data, counter)
  json_link = data.links.select { |link| link.first == 'application/json' }
  if json_link.present?
    json_link = json_link[0][1]

    broader, narrower, variants = get_skos_concepts(json_link.gsub('.json',''))
  end

  #count = ActiveFedora::Base.find_with_conditions("subject_tesim:#{data.id.gsub('info:lc', 'http://id.loc.gov').gsub(':','\:')}", rows: '100', fl: 'id' ).length
  #FIXME
  count = ActiveFedora::Base.search_with_conditions("#{@solr_field}:#{solr_clean(data.id.gsub('info:lc', 'http://id.loc.gov'))}", rows: '100', fl: 'id' ).length
  #count = 0
  if count >= 99
    count = "99+"
  else
    count = count.to_s
  end



  {
      "uri_link" => data.id.gsub('info:lc', 'http://id.loc.gov') || data.title,
      "label" => data.title,
      "broader" => broader,
      "narrower" => narrower,
      "variants" => variants,
      "count" => count
  }
end

#parse_authority_response ⇒ Object

Reformats the data received from the LOC service



63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/mei/loc.rb', line 63

def parse_authority_response
  threaded_responses = []
  #end_response = Array.new(20)
  end_response = []
  position_counter = 0
  @raw_response.select {|response| response[0] == "atom:entry"}.map do |response|
    threaded_responses << Thread.new(position_counter) { |local_pos|
      end_response[local_pos] = loc_response_to_qa(response_to_struct(response), position_counter)
    }
    position_counter+=1
    #sleep(0.05)

    #loc_response_to_qa(response_to_struct(response))
  end
  threaded_responses.each { |thr|  thr.join }
  end_response
end

#response_to_struct(response) ⇒ Object 



117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# File 'lib/mei/loc.rb', line 117

def response_to_struct response
  result = response.each_with_object({}) do |result_parts, result|
    next unless result_parts[0]
    key = result_parts[0].sub('atom:', '').sub('dcterms:', '')
    info = result_parts[1]
    val = result_parts[2]

    case key
      when 'title', 'id', 'name', 'updated', 'created'
        result[key] = val
      when 'link'
        result["links"] ||= []
        result["links"] << [info["type"], info["href"]]
    end
  end

  OpenStruct.new(result)
end

#search(q) ⇒ Object 



50
51
52
53
 
# File 'lib/mei/loc.rb', line 50

def search q
  @raw_response = get_json(build_query_url(q))
  parse_authority_response
end

#solr_clean(term) ⇒ Object 



113
114
115
 
# File 'lib/mei/loc.rb', line 113

def solr_clean(term)
  return term.gsub('\\', '\\\\').gsub(':', '\\:').gsub(' ', '\ ')
end