Class: DbpediaConceptSearch

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(query_class, query_string) ⇒ DbpediaConceptSearch

Returns a new instance of DbpediaConceptSearch.



17
18
19
20
 
# File 'lib/dbpedia_concept_search.rb', line 17

def initialize(query_class, query_string)
  @query_class = query_class
  @query_string = query_string
end

Instance Attribute Details

#query_class ⇒ Object (readonly)

Returns the value of attribute query_class.



7
8
9
 
# File 'lib/dbpedia_concept_search.rb', line 7

def query_class
  @query_class
end

#query_string ⇒ Object (readonly)

Returns the value of attribute query_string.



7
8
9
 
# File 'lib/dbpedia_concept_search.rb', line 7

def query_string
  @query_string
end

Class Method Details

.hostname ⇒ Object 



9
10
11
 
# File 'lib/dbpedia_concept_search.rb', line 9

def self.hostname
  @hostname ||= 'lookup.dbpedia.org'
end

.hostname=(hostname) ⇒ Object 



13
14
15
 
# File 'lib/dbpedia_concept_search.rb', line 13

def self.hostname=(hostname)
  @hostname = hostname
end

Instance Method Details

#cleaned_query_string ⇒ Object 



26
27
28
 
# File 'lib/dbpedia_concept_search.rb', line 26

def cleaned_query_string
  query_string.gsub(/\s/, '%20')
end

#collapse_singular_child_into_plural_parent(hash) ⇒ Object 



95
96
97
98
99
100
101
102
103
 
# File 'lib/dbpedia_concept_search.rb', line 95

def collapse_singular_child_into_plural_parent(hash)
  parents = Hash.new
  hash.each do |key, value|
    if value.kind_of?(Hash) and Regexp.new("^#{value.keys.first.gsub(/y\s*$/, 'i')}(s|es)") =~ key
      parents[key] = value.values.first
    end
  end
  hash.merge(parents)
end

#dbpedia_url ⇒ Object 



22
23
24
 
# File 'lib/dbpedia_concept_search.rb', line 22

def dbpedia_url
  %Q{http://#{DbpediaConceptSearch.hostname}/api/search.asmx/KeywordSearch?QueryClass=#{query_class}&QueryString=#{cleaned_query_string}}
end

#downcase_hash(hash) ⇒ Object 



47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/dbpedia_concept_search.rb', line 47

def downcase_hash(hash)
  if hash.kind_of? Hash
    hash.each_with_object({}) do |(k, v), h|
      h[k.downcase] = downcase_hash(v)
      h.delete(k) unless k == k.downcase
    end
  elsif hash.kind_of? Array
    hash.collect do |h|
      downcase_hash(h)
    end
  else
    return hash
  end
end

#hash_from_xml ⇒ Object 



79
80
81
 
# File 'lib/dbpedia_concept_search.rb', line 79

def hash_from_xml
  @hash ||= Nori.new.parse(xml)
end

#hash_results ⇒ Object 



87
88
89
 
# File 'lib/dbpedia_concept_search.rb', line 87

def hash_results
  hash_from_xml['ArrayOfResult']['Result'] if hash_from_xml['ArrayOfResult']
end

#hash_results_array ⇒ Object 



91
92
93
 
# File 'lib/dbpedia_concept_search.rb', line 91

def hash_results_array
  hash_results.kind_of?(Array) ? hash_results : [hash_results]
end

#infanticide(hash) ⇒ Object 



62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/dbpedia_concept_search.rb', line 62

def infanticide(hash)
  if hash.kind_of?(Hash)
    hash = collapse_singular_child_into_plural_parent(hash)
    hash.each_with_object({}) do |(k, v), h|
      h[k] = infanticide(v)
    end

  end
  if hash.kind_of?(Array)
    hash.collect do |h|
      infanticide(h)
    end
  else
    return hash
  end
end

#processed_hash(hash) ⇒ Object 



42
43
44
45
 
# File 'lib/dbpedia_concept_search.rb', line 42

def processed_hash(hash)
  hash = infanticide(hash)
  hash = downcase_hash(hash)
end

#response ⇒ Object 



34
35
36
 
# File 'lib/dbpedia_concept_search.rb', line 34

def response
  @response ||= Typhoeus::Request.get(dbpedia_url)
end

#results ⇒ Object 



38
39
40
 
# File 'lib/dbpedia_concept_search.rb', line 38

def results
  hash_results_array.compact.collect{|result| Hashie::Mash.new(processed_hash(result))}
end

#to_json ⇒ Object 



83
84
85
 
# File 'lib/dbpedia_concept_search.rb', line 83

def to_json
  processed_hash(hash_results_array.compact).to_json
end

#xml ⇒ Object 



30
31
32
 
# File 'lib/dbpedia_concept_search.rb', line 30

def xml
  @xml ||= response.body
end