Class: GoogleScholarLink

Inherits:
Service show all
Defined in:
app/service_adaptors/google_scholar_link.rb

Overview

Generates a LINK to search google scholar for the requested article. G.Scholar has no API, all we can do is link out.

Will only generate link for citations that appear article-level and have author and title.

You probably want to only execute if there is no found fulltext, by configuring in umlaut_services.yml with:

preempted_by:

existing_type: fulltext

It will only be preempted by fulltext created in earlier waves of service execution, service order ‘priority’ matters.

optional config: service_type, defaults to ‘highlighted_link’, but maybe

you want it actually under 'fulltext' or something.

Constant Summary

Constants inherited from Service

Service::LinkOutFilterTask, Service::StandardTask

Instance Attribute Summary

Attributes inherited from Service

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

Instance Method Summary collapse

Methods inherited from Service

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

Constructor Details

#initialize(config) ⇒ GoogleScholarLink

Returns a new instance of GoogleScholarLink.



21
22
23
24
25
26
 
# File 'app/service_adaptors/google_scholar_link.rb', line 21

def initialize(config)
  @service_type = "highlighted_link"
  @display_name = "Google Scholar"
  
  super(config)
end

Instance Method Details

#construct_query(request) ⇒ Object 



52
53
54
55
56
57
58
59
60
61
62
 
# File 'app/service_adaptors/google_scholar_link.rb', line 52

def construct_query(request)
  metadata = request.referent.metadata
  
  title_query   = "allintitle: \"#{metadata["atitle"]}\""
    
  author_query  = (metadata["aulast"] || metadata["au"]).strip.split(/\s+|[[:punct:]]+/).
    reject {|term| term.length <= 3}.
    collect { |term| "author:#{term}" }.join(" ")
  
  "#{title_query} #{author_query}"
end

#handle(request) ⇒ Object 



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
# File 'app/service_adaptors/google_scholar_link.rb', line 33

def handle(request)
  return request.dispatched(self, true) unless should_link_out_to?(request)

  link = "http://scholar.google.com/scholar?q=#{CGI.escape construct_query(request)}"
  
  request.add_service_response(
    :service            => self,      
    :display_text       => "Look for article on Google Scholar",
    :display_text_i18n  => "display_text",
    :url                => link,
    :service_type_value => @service_type,
    :notes              => "This article <b>may</b> be available on the public web, look for links labelled <span class='gscholar_example'>[html]</span> or <span class='gscholar_example'>[pdf]</span>".html_safe,
    :notes_i18n         => "notes_html"
  )
  
  return request.dispatched(self, true)
end

#service_types_generated ⇒ Object 



28
29
30
 
# File 'app/service_adaptors/google_scholar_link.rb', line 28

def service_types_generated
  [ServiceTypeValue[@service_type]]
end

#should_link_out_to?(request) ⇒ Boolean

Returns:

  • (Boolean) 


64
65
66
67
68
69
70
71
 
# File 'app/service_adaptors/google_scholar_link.rb', line 64

def should_link_out_to?(request)
  return false unless (! request.title_level_citation?)
  
  metadata = request.referent.metadata
  
  metadata["atitle"] && (metadata["au"] || metadata["aulast"])
  
end