Class: ElsevierApi::Connection

Inherits:
Object
  • Object
show all
Extended by:
URIRequest
Includes:
URIRequest
Defined in:
lib/elsevier_api/connection.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from URIRequest

get_uri_abstract, get_uri_articles_country_year_area, get_uri_author, get_uri_citation_overview, get_uri_journal_articles

Constructor Details

#initialize(key, opts = {}) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/elsevier_api/connection.rb', line 38

def initialize(key, opts={})
  @key=key
  @use_proxy=false
  @error=false
  @error_msg=nil
  if opts[:proxy_host]
    @use_proxy=true
    @proxy_host=opts[:proxy_host]
    @proxy_port=opts[:proxy_port]
    @proxy_user=opts[:proxy_user]
    @proxy_pass=opts[:proxy_pass]
  end
end

Instance Attribute Details

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/elsevier_api/connection.rb', line 35

def error
  @error
end

#error_msg ⇒ Object (readonly)

Returns the value of attribute error_msg.



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# File 'lib/elsevier_api/connection.rb', line 35

def error_msg
  @error_msg
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/elsevier_api/connection.rb', line 35

def key
  @key
end

#proxy_host ⇒ Object

Returns the value of attribute proxy_host.



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# File 'lib/elsevier_api/connection.rb', line 37

def proxy_host
  @proxy_host
end

#proxy_pass ⇒ Object

Returns the value of attribute proxy_pass.



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# File 'lib/elsevier_api/connection.rb', line 37

def proxy_pass
  @proxy_pass
end

#proxy_post ⇒ Object

Returns the value of attribute proxy_post.



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# File 'lib/elsevier_api/connection.rb', line 37

def proxy_post
  @proxy_post
end

#proxy_user ⇒ Object

Returns the value of attribute proxy_user.



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# File 'lib/elsevier_api/connection.rb', line 37

def proxy_user
  @proxy_user
end

#raw_xml ⇒ Object (readonly)

Returns the value of attribute raw_xml.



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# File 'lib/elsevier_api/connection.rb', line 35

def raw_xml
  @raw_xml
end

#use_proxy ⇒ Object

Returns the value of attribute use_proxy.



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# File 'lib/elsevier_api/connection.rb', line 36

def use_proxy
  @use_proxy
end

#xml_response ⇒ Object (readonly)

Returns the value of attribute xml_response.



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# File 'lib/elsevier_api/connection.rb', line 35

def xml_response
  @xml_response
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/elsevier_api/connection.rb', line 54

def close
  @connection.close if @connection
end

#connection ⇒ Object 



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# File 'lib/elsevier_api/connection.rb', line 51

def connection
  @connection||=get_connection
end

#get_articles_from_uri(uri) ⇒ Object 



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# File 'lib/elsevier_api/connection.rb', line 100

def get_articles_from_uri(uri)
  completo=false
  acumulado=[]
  pagina=1
  until completo do
    #puts "Page:#{pagina}"
    xml_response=retrieve_response(uri)
    if @error
      break
    else
      acumulado=acumulado+xml_response.entries_to_hash
      next_page=xml_response.next_page
      if next_page
        pagina+=1
        uri=next_page.attribute("href").value
      else
#          puts "completo"
        completo=true
      end
    end  
  end
  acumulado
end

#get_journal_articles(journal, year = nil) ⇒ Object 



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# File 'lib/elsevier_api/connection.rb', line 124

def get_journal_articles(journal,year=nil)
uri=get_uri_journal_articles(journal,year)
completo=false
acumulado=[]
until completo do
  xml_response=retrieve_response(uri)
  if @error
    break
  else
    acumulado=acumulado+xml_response.entries_to_ary
    next_page=xml_response.next_page
    if next_page
      uri=next_page.attribute("href").value
      #puts "siguiente pagina"
    else
      #puts "completo"
      completo=true
    end
  end  
end
acumulado
end

#retrieve_response(uri_string) ⇒ Object

Connect to api and retrieve a response based on URI



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# File 'lib/elsevier_api/connection.rb', line 59

def retrieve_response(uri_string)
  @xml_response=nil
  begin
    Curl::Easy.new(uri_string) do |curl|
      if @use_proxy
        curl.proxy_tunnel = true
        curl.proxy_url = "http://#{@proxy_host}:#{@proxy_port}/"
        curl.proxypwd = "#{@proxy_user}:#{proxy_pass}"
      end
      curl.follow_location = true
      curl.ssl_verify_peer = false
      curl.max_redirects = 3
      curl.headers=['Accept: application/xml', "X-ELS-APIKey: #{@key}"]
      curl.perform
      #p curl.body_str
      xml=Nokogiri::XML(curl.body_str)
      if xml.xpath("//service-error").length>0
        @error=true
        @error_msg=xml.xpath("//statusText").text
      elsif xml.xpath("//atom:error",'atom'=>'http://www.w3.org/2005/Atom').length>0
        @error=true
        @error_msg=xml.xpath("//atom:error").text
      elsif xml.children.length==0
        @error=true
        @error_msg="Empty_XML"
      else
        @error=false
        @error_msg=nil
      end
      @xml_response=ElsevierApi.process_xml(xml)
    end
  rescue Exception=>e
    #$log.info(e.message)
    @error=true
    @error_msg=e.message
  end

  @xml_response
  
end