Class: HipHoldingSearch

Inherits:
Hip3Service show all
Includes:
MarcHelper
Defined in:
app/service_adaptors/hip_holding_search.rb

Constant Summary

Constants inherited from Service

Service::LinkOutFilterTask, Service::StandardTask

Instance Attribute Summary collapse

Attributes inherited from Service

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

Instance Method Summary collapse

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 Hip3Service

#add_copies, #get_bibnum, #url_service_type

Methods included from MetadataHelper

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

Methods inherited from Service

#credits, #display_name, #handle_wrapper, #link_out_filter, #preempted_by, required_config_params, #response_url, #translate

Constructor Details

#initialize(config) ⇒ HipHoldingSearch

Returns a new instance of HipHoldingSearch.



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# File 'app/service_adaptors/hip_holding_search.rb', line 9

def initialize(config)
  # Default preemption by any holding
  @bib_limit = 4
  @preempted_by = { "existing_type" => "holding" }
  @keyword_exact_match = true
  # If you are sending an OpenURL from a library service, you may
  # have the HIP bibnum, and include it in the OpenURL as, eg.
  # rft_id=http://catalog.library.jhu.edu/bib/343434 (except URL-encoded)
  # Then you'd set rft_id_bibnum_prefix to http://catalog.library.jhu.edu/bib/
  @rft_id_bibnum_prefix = nil
  @profile = "general"
  super(config)
  # Trim question-mark from base_url, if given
  @base_path.chop! if (@base_path.rindex('?') ==  @base_path.length)    
end

Instance Attribute Details

#base_path ⇒ Object (readonly)

Returns the value of attribute base_path.



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# File 'app/service_adaptors/hip_holding_search.rb', line 5

def base_path
  @base_path
end

Instance Method Details

#handle(request) ⇒ Object 



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# File 'app/service_adaptors/hip_holding_search.rb', line 31

def handle(request)
  
  # Only do anything if we have no holdings results from someone else.
  holdings = request.service_types.where(:service_type_value_name => "holding")
  
  if (holdings.length > 0)
    return request.dispatched(self, true)
  end

  ref_metadata = request.referent.metadata
  
  bib_searcher = Hip3::BibSearcher.new(@base_path)

  search_hash = {}

  if ( request.referent.format != "book" && 
      (! ref_metadata['jtitle'].blank?) && 
      ref_metadata['bititle'].blank? )
    hip_title_index = Hip3::BibSearcher::SERIAL_TITLE_KW_INDEX    
  else
    hip_title_index = Hip3::BibSearcher::TITLE_KW_INDEX
  end
  
  title = ref_metadata['jtitle']     
  title = ref_metadata['btitle'] if title.blank?
  title = ref_metadata['title'] if title.blank?
  
  #title_terms = search_terms_for_title_tokenized(title)
  # tokenized was too much recall, not enough precision. Try phrase
  # search. 
  title_terms = search_terms_for_title_phrase(title)
  unless ( title_terms )
    Rails.logger.debug("#{self.service_id} is missing title, can not search.")
    return request.dispatched(self, true)
  end
  
  
  search_hash[hip_title_index] = title_terms

  # Do we have the bibnum?
  bibnum = get_bibnum(request.referent) 
  bib_searcher.bibnum = bibnum if bibnum 
  
  # If it's a non-journal thing, add the author if we have an aulast (preferred) or au. 
  # But wait--if it's a book _part_, don't include the author name, since
  # it _might_ just be the author of the part, not of the book. 
  unless (request.referent.format == "journal" ||
            ( request.referent.format == "book" &&  ! ref_metadata['atitle'].blank?))
    # prefer aulast
    if (! ref_metadata['aulast'].blank?)
      search_hash[ Hip3::BibSearcher::AUTHOR_KW_INDEX ] = [ref_metadata['aulast']]
    elsif (! ref_metadata['au'].blank?)
      search_hash[ Hip3::BibSearcher::AUTHOR_KW_INDEX ] = [ref_metadata['au']]
    end
    
  end
  
  bib_searcher.search_hash = search_hash 
  unless bib_searcher.insufficient_query
    timing_debug("start search")
    
    bibs = bib_searcher.search

    timing_debug("bib searching")

    # Ssee if any our matches are exact title matches. 'exact' after normalizing a bit, including removing subtitles.
    matches = [];

    # Various variant normalized forms of the title from the OpenURL
    # request. #compact removes nil values. 
    request_titles = [title, 
                     normalize_title( title ), 
                     normalize_title( title, :remove_subtitle => true)   ].compact
    


    if ( @keyword_exact_match )
      bibs.each do |bib|
        # various variant normalized forms of the title from the bib
        # #compact removes nil values. 
        bib_titles = [ bib.title, 
                       normalize_title(bib.title, :remove_subtitle => true),
                       normalize_title(bib.title) ].compact

        # Do any of the various forms match? Set intersection on our
        # two sets.
        if ( bib_titles & request_titles ).length > 0
          matches.push( bib )
        end        
      end
    end
    
    responses_added = Hash.new

    timing_debug("Finding matches")
    
    if (matches.length > 0 )
      
      # process as exact matches with method from Hip3Service
      # Add copies
      # Add 856 urls.
      responses_added = {}

      unless preempted_by(request, "fulltext")

        # Let's do some analysis of our results. If it's got a matching
        # bibnum, then include it as an EXACT match.
        req_bibnum = get_bibnum(request.referent)
        if ( req_bibnum )
          matches.each do |bib|
            if (req_bibnum == bib.bibNum)
              responses_added.merge!( add_856_links(request, [bib.marc_xml])  )
              responses_added.merge!( add_copies( request, [bib] ))
              matches.delete(bib)
            end                                            
          end
        end

        timing_debug("Identified matches")
        
        # Otherwise, sort records with matching dates FIRST.
        # Some link generators use an illegal 'year' parameter, bah. 
        if ( date = (request.referent['date'] || request.referent['year']))
          req_year = date[0,4]
          matches = matches.partition {|bib| get_years(bib.marc_xml).include?( req_year )}.flatten            
        end

        timing_debug("Date sorted")
        
        responses_added.merge!( add_856_links(request, matches.collect{|b| b.marc_xml}, :match_reliability => ServiceResponse::MatchUnsure ) )

        timing_debug("added 856's")
      end

      responses_added.merge!(  add_copies(request, matches, :match_reliability => ServiceResponse::MatchUnsure ) )

      timing_debug("added copies")
      
    end
    
    if (bibs.length > 0 && (! responses_added['holding']))
      # process as holdings_search      
      request.add_service_response(
        :service => self,
        :source_name => @display_name,
        :count => bibs.length,
        :display_text => "#{bibs.length} possible #{case; when bibs.length > 1 ; 'matches' ; else; 'match' ; end} in #{display_name}",
        :url => bib_searcher.search_url,
        :service_type_value => :holding_search)
    end      
  end
  return request.dispatched(self, true)
end

#search_terms_for_title_phrase(title) ⇒ Object

Another algorithm for turning a title into HIP search terms. This one doesn’t tokenize, but keeps the whole title as a phrase search. Does eliminate punctuation. Does not remove things that look like a sub-title. Returns an array with one item.



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# File 'app/service_adaptors/hip_holding_search.rb', line 214

def search_terms_for_title_phrase(title)
  title_cleaned = normalize_title(title)

  if title_cleaned.blank?
    # Not enough metadata to search.
    return nil      
  end

  return [title_cleaned]    
end

#search_terms_for_title_tokenized(title) ⇒ Object

One algorithm for turning a title into HIP search terms. Tokenizes the title into individual words, eliminates stop-words, and combines each word with ‘AND’. We started with this for maximum recall, but after some experimentation seems to have too low precision without sufficient enough increase in recall. Returns an array of keywords.



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# File 'app/service_adaptors/hip_holding_search.rb', line 191

def search_terms_for_title_tokenized(title)
  title_cleaned = normalize_title(title)
  
  if title_cleaned.blank?
    # Not enough metadata to search.
    return nil      
  end
  
  # plus remove some obvious stop words, cause HIP is going to choke on em
  title_cleaned.gsub!(/\bthe\b|\band\b|\bor\b|\bof\b|\ba\b/i,'')

  title_kws = title_cleaned.split 
  # limit to 12 keywords
  title_kws = title_kws.slice( (0..11) )

  return title_kws
end

#service_types_generated ⇒ Object 



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# File 'app/service_adaptors/hip_holding_search.rb', line 25

def service_types_generated
  # Add one more to whatever the Hip3Service does. 
  return super.push(ServiceTypeValue['holding_search'])    
end

#timing_debug(waypoint = "Waypoint") ⇒ Object 



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# File 'app/service_adaptors/hip_holding_search.rb', line 225

def timing_debug(waypoint = "Waypoint")
  @last_timed ||= Time.now

  before = @last_timed
  @last_timed = Time.now

  interval = @last_timed - before

  Rails.logger.debug("#{service_id}: #{waypoint}: #{interval}")
  
end