Class: Crossref::Metadata

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Metadata

Returns a new instance of Metadata.



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# File 'lib/crossref.rb', line 11

def initialize(opts = {})
  @base_url =  opts[:base_url] || 'http://crossref.org/openurl/?noredirect=true&format=unixref'      
  @doi = opts[:doi]
  @pid = opts[:pid]
  @base_url += '&pid=' + @pid if @pid
  
  if @doi
    @doi = sanitize_doi(@doi)
    @url = @base_url + "&id=doi:" + @doi
    @xml = get_xml(@url)
  end
end

Instance Attribute Details

#doi(doi) ⇒ Object

Returns the value of attribute doi.



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# File 'lib/crossref.rb', line 9

def doi
  @doi
end

#url ⇒ Object

Returns the value of attribute url.



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# File 'lib/crossref.rb', line 9

def url
  @url
end

#xml ⇒ Object

Returns the value of attribute xml.



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# File 'lib/crossref.rb', line 9

def xml
  @xml
end

Instance Method Details

#authors ⇒ Object 



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# File 'lib/crossref.rb', line 44

def authors
  authors = []
  xpath_ns('contributors/person_name[@contributor_role="author"]').each do |a| 
   authors << hashify_nodes(a.children) 
  end
  authors
end

#journal ⇒ Object 



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# File 'lib/crossref.rb', line 61

def journal
  journal = hashify_nodes(xpath_ns('journal_metadata').first.children)
  journal[:volume] = xpath_first('journal_issue/journal_volume/volume') 
  journal[:issue] = xpath_first('journal_issue/issue')
  journal[:first_page] = xpath_first('first_page')
  journal[:last_page] = xpath_first('last_page')

  journal
end

#published ⇒ Object 



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# File 'lib/crossref.rb', line 53

def published
  pub = Hash.new
  pub[:year] = xpath_first('publication_date/year')
  pub[:month] = xpath_first('publication_date/month')
  pub
end

#resource ⇒ Object 



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# File 'lib/crossref.rb', line 71

def resource
  xpath_first('doi_data/resource')
end

#result? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/crossref.rb', line 30

def result?
  if self.xml.nil? || xpath_ns('error').size == 1
    false
  else
    xpath_ns('doi_record').size == 1
  end
end

#title ⇒ Object 



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# File 'lib/crossref.rb', line 39

def title
  xpath_first('titles/title')
end

#xpath_first(q) ⇒ Object 



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# File 'lib/crossref.rb', line 79

def xpath_first(q)
  if info = xpath_ns(q).first
    info.content
  else
    nil
  end
end

#xpath_ns(q, ns = 'http://www.crossref.org/xschema/1.0') ⇒ Object 



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# File 'lib/crossref.rb', line 75

def xpath_ns(q, ns = 'http://www.crossref.org/xschema/1.0')
  self.xml.xpath("//#{q.split('/').map {|e| "xmlns:#{e}"}.join('/')}", 'xmlns' => ns)
end