Class: MiniHarvest::MiniHarvest

Inherits:
Object
  • Object
show all
Defined in:
lib/miniharvest.rb

Constant Summary collapse

@@marc_collection = 
Nokogiri::XML('<collection xmlns="http://www.loc.gov/MARC21/slim">')

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#from ⇒ Object

Returns the value of attribute from.



12
13
14
 
# File 'lib/miniharvest.rb', line 12

def from
  @from
end

#oai_base_uri ⇒ Object

Returns the value of attribute oai_base_uri.



12
13
14
 
# File 'lib/miniharvest.rb', line 12

def oai_base_uri
  @oai_base_uri
end

#set ⇒ Object

Returns the value of attribute set.



12
13
14
 
# File 'lib/miniharvest.rb', line 12

def set
  @set
end

Instance Method Details

#append_to_collection(records) ⇒ Object 



14
15
16
 
# File 'lib/miniharvest.rb', line 14

def append_to_collection(records)
  @@marc_collection.at('collection').add_child(records)
end

#get_records(token) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/miniharvest.rb', line 40

def get_records(token)
  params = { :verb => 'ListRecords', :resumptionToken => token }
  res = oai_request(self.oai_base_uri,params)
  resumption_token = process_request(res)
  if resumption_token != ""
    get_records(resumption_token)
  else
    puts @@marc_collection.to_s
    return
  end
end

#initial_request ⇒ Object 



34
35
36
37
38
 
# File 'lib/miniharvest.rb', line 34

def initial_request
  params = { :verb => 'ListRecords', :set => self.set, :metadataPrefix => 'marc21', :from => self.from }
  res = oai_request(self.oai_base_uri,params)
  get_records(process_request(res))
end

#oai_request(uri, params) ⇒ Object 



18
19
20
21
22
 
# File 'lib/miniharvest.rb', line 18

def oai_request(uri,params)
  oai_uri = URI(uri)
  oai_uri.query = URI.encode_www_form(params)
  return Net::HTTP.get_response(oai_uri)
end

#process_request(res) ⇒ Object 



24
25
26
27
28
29
30
31
32
 
# File 'lib/miniharvest.rb', line 24

def process_request(res)
  doc = Nokogiri::XML(res.body)
  doc.remove_namespaces!
  records =  doc.xpath('//record')
  append_to_collection(records)
  
  resumption_token =  doc.xpath('//resumptionToken')
  return resumption_token.text
end