Class: Isi

Inherits:
Service show all
Includes:
MetadataHelper
Defined in:
lib/service_adaptors/isi.rb

Overview

Uses ISI Web of Knowledge to generates links to “cited by” and “similar” articles.

REQUIREMENTS: You must be an ISI customer if you want these links to actually work for your users. Off-campus users should be sent through EZProxy, see the EZProxy plug-in.

You need to register for the the Thomson ‘Links Article Match Retrieval’ (LAMR) service api, which is used here. To register, see: wokinfo.com/products_tools/products/related/amr/

You register by IP address, so no API key is needed once your registration goes through.

If you later need to change the IP addresses entitled to use this API, use scientific.thomson.com/scientific/techsupport/cpe/form.html. to request a change.

Note, as of 13 april 09, there’s a bug in ISI where journal titles including ampersands cause an error. We will catch those errors and output a ‘warning’ instead of an ‘error’, since it’s a known problem.

Constant Summary

Constants inherited from Service

Service::LinkOutFilterTask, Service::StandardTask

Instance Attribute Summary

Attributes inherited from Service

#name, #priority, #request, #service_id, #session_id, #status, #task, #url

Instance Method Summary collapse

Methods included from MetadataHelper

#get_doi, #get_gpo_item_nums, #get_identifier, #get_isbn, #get_issn, #get_lccn, #get_oclcnum, #get_pmid, #get_search_creator, #get_search_terms, #get_search_title, #get_sudoc, #get_top_level_creator, #get_year, #normalize_lccn, #normalize_title, #raw_search_title, #title_is_serial?

Methods included from MarcHelper

#add_856_links, #edition_statement, #get_title, #get_years, #gmd_values, #service_type_for_856, #should_skip_856_link?, #strip_gmd

Methods inherited from Service

#credits, #display_name, #handle_wrapper, #link_out_filter, #preempted_by, required_config_params, #response_to_view_data, #response_url, #view_data_from_service_type

Constructor Details

#initialize(config) ⇒ Isi

Returns a new instance of Isi.



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# File 'lib/service_adaptors/isi.rb', line 37

def initialize(config)
  #defaults
  @wos_app_name = "Umlaut"
  @display_name = "Web of Knowledge\xc2\xae" # trademark symbol
  @api_url = "https://ws.isiknowledge.com/cps/xrpc"
  @include_cited_by = true
  @include_similar = true
  
  @credits = {
    @display_name => "http://apps.webofknowledge.com"
  }
  
  super(config)
end

Instance Method Details

#add_responses(request, isi_response) ⇒ Object 



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# File 'lib/service_adaptors/isi.rb', line 196

def add_responses(request, isi_response)
  #raise if it's an error HTTP response
  isi_response.value
  
  response_xml = Nokogiri::XML(isi_response.body)
  
  # Check for errors.
  if (error = (response_xml.at('val[@name = "error"]') || response_xml.at("error") || response_xml.at('null[@name = "error"]')))
   raise IsiResponseException.new("ISI service reported error: #{error.inner_text}")      
  end
  
  results = response_xml.at('map[@name ="cite_id"] map[@name="WOS"]')
  unless (results)
    error_message = "#{self.id}: "
    error_message << 'Unexpected ISI response. The ISI response was not reported as an error, but did not contain a <map name="WOS"> inside a <map name="cite_id"> as we expected it to:'
    error_message << "\n ISI XML request:\n#{gen_lamr_request(request)}\n"
    error_message << "\n ISI http response status: #{isi_response.code}\n"
    error_message << "\n ISI http response body:\n#{isi_response.body}\n"
    Rails.logger.error(error_message)
  end

  
  # cited by
  count = results.at('val[@name="timesCited"]')
  count = count ? count.inner_text.to_i : 0    
  
  cited_by_url = results.at('val[@name="citingArticlesURL"]')
  cited_by_url = cited_by_url.inner_text if cited_by_url

  if (@include_cited_by && count > 0 && cited_by_url )
    label = ServiceTypeValue[:cited_by].display_name_pluralize.downcase.capitalize    
    if count && count == 1
      label = ServiceTypeValue[:cited_by].display_name.downcase.capitalize
    end
    
    request.add_service_response(:service=>self, 
      :display_text => "#{count} #{label}", 
      :count=> count, 
      :url => cited_by_url,
      :debug_info => "url: " + cited_by_url,
      :service_type_value => :cited_by)
  end
  
  # similar
  
  similar_url = results.at('val[@name ="relatedRecordsURL"]')
  similar_url = similar_url.inner_text if similar_url

  if (@include_similar && similar_url )
      request.add_service_response( :service=>self, 
        :display_text => " #{ServiceTypeValue[:similar].display_name_pluralize.downcase.capitalize}", 
        :url => similar_url,
        :debug_info => "url: " + similar_url,
        :service_type_value => :similar)
  end
  
end

#do_lamr_request(xml) ⇒ Object 



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# File 'lib/service_adaptors/isi.rb', line 186

def do_lamr_request(xml)
  uri = URI.parse(@api_url)
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true if (uri.scheme == 'https')

  headers = {'Content-Type' => 'application/xml'}
  
  return http.post(uri.request_uri, xml, headers)
end

#gen_lamr_request(request) ⇒ Object

produces XML to be posted to Thomson ‘Links Article Match Retrieval’ service api.



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# File 'lib/service_adaptors/isi.rb', line 102

def gen_lamr_request(request)
  output = ""
  
  builder = Builder::XmlMarkup.new(:target => output, :indent => 2)
  builder.instruct!(:xml, :encoding => "UTF-8")    

  builder.request(:xmlns => "http://www.isinet.com/xrpc41", :src => "app.id=Umlaut") do
    builder.fn(:name => "LinksAMR.retrieve") do
      builder.list do
        # first map is authentication info. empty 'map' element since we are IP authenticated. 
        builder.map
        # specify what we're requesting
        builder.map do
          builder.list(:name=>"WOS") do
            builder.val("timesCited")
            builder.val("ut")
            builder.val("doi")
            builder.val("sourceURL")
            builder.val("citingArticlesURL")
            builder.val("relatedRecordsURL")
          end
        end
        # specify our query
        builder.map do
          builder.map(:name => "cite_id") do
            # Here's the tricky part, depends on what we've got.
            metadata = request.referent.metadata

            # DOI
            if ( doi = get_doi(request.referent))
              builder.val(doi, :name => "doi")
            end

            if ( pmid = get_pmid(request.referent))
              builder.val(pmid, :name => "pmid")
            end

            # Journal title is crucial for ISI -- ISSN alone is
            # not enough, weirdly!
            if ( ! metadata['jtitle'].blank? )
              builder.val(metadata['jtitle'], :name => "stitle" )
            else
              builder.val(metadata['title'], :name => 'stitle' )
            end
            
            # ISSN, not actually used much by ISI, but can't hurt. 
            if ( issn = request.referent.issn )
              # ISSN _needs_ a hyphen for WoS, bah!
              unless issn.match( /\-/ )
                issn = issn[0,4] + '-' + issn[4,7]
              end
              builder.val(issn, :name => "issn")
            end

            # article title often helpful. 
            unless ( metadata['atitle'].blank?)
              builder.val( metadata['atitle'], :name => "atitle")
            end
            # year
            unless ( metadata['date'].blank?)
              #first four digits are year
              builder.val( metadata["date"][0,4], :name => "year" )
            end

            # Vol/issue/page.  Oddly, issue isn't used very strongly
            # by ISI, but can't hurt. 
            unless ( metadata['volume'].blank? )
              builder.val(metadata['volume'], :name => 'vol')
            end
            unless ( metadata['issue'].blank? )
              builder.val( metadata['issue'] , :name => 'issue')
            end
            unless ( metadata['spage'].blank? )
              builder.val(metadata['spage'], :name => 'spage ')
            end
            
          end
        end          
      end
    end
  end
  return output
end

#handle(request) ⇒ Object 



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# File 'lib/service_adaptors/isi.rb', line 52

def handle(request)
  
  unless ( sufficient_metadata?(request.referent))
     return request.dispatched(self, true)
  end
  
  xml = gen_lamr_request(request)
  
  isi_response = do_lamr_request(xml)
  
  
  begin
    add_responses( request, isi_response )
  rescue IsiResponseException => e
    # Is this the known problem with ampersands?
    # if so, output a warning, but report success not exception,
    # because this is a known condition.
    metadata = request.referent.metadata
    if ( (metadata["title"] && metadata["title"].include?('&')) ||
         (metadata["jtitle"] && metadata['jtitle'].include?('&')))
      Rails.logger.warn("ISI LAMR still exhibiting ampersand problems: #{e.message} ; OpenURL: ?#{request.to_context_object.kev}")
      return request.dispatched(self, true)
    else    
      # Log the error, return exception condition. 
      Rails.logger.error("#{e.message} ; OpenURL: ?#{request.to_context_object.kev}")
      return request.dispatched(self, false, e)
    end
  end
  
  return request.dispatched(self, true)
end

#service_types_generated ⇒ Object 



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# File 'lib/service_adaptors/isi.rb', line 33

def service_types_generated
  return [ServiceTypeValue[:cited_by]]
end

#sufficient_metadata?(referent) ⇒ Boolean

A DOI is always sufficient. Otherwise, it gets complicated because the ISI service is kind of picky in weird ways. ISSN alone is not enough, we need jtitle. Once you have jtitle, Vol/issue/start page are often enough, but article title really helps, and jtitle+atitle+year is often enough too.

Returns:

  • (Boolean) 


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# File 'lib/service_adaptors/isi.rb', line 88

def sufficient_metadata?(referent)
  metadata = referent.metadata
  return get_doi(referent) || get_pmid(referent) ||
      (  ( metadata['jtitle'] || 
           metadata['title'] )   &&           
         (! (metadata['atitle'].blank? ||
            metadata['date'].blank?
            ) ||
          ! ( metadata['volume'].blank? || metadata['issue'].blank? ||
              metadata['spage'].blank?))
      )    
end