Class: YANAPI::Query

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

Direct Known Subclasses

CategoryQuery, QuestionQuery, TermQuery, UserQuery

Constant Summary collapse

HOST = 
'http://answers.yahooapis.com'
SERVICE = 
'AnswersService'
SERVICE_VERSION = 
'V1'
VALID_PARAMS = 
[:appid, :output, :callback]
REQUIRED_PARAMS = 
[:appid]
VALID_OUTPUT_FORMATS = 
[nil, 'xml', 'php', 'rss', 'json']

Instance Method Summary collapse

Constructor Details

#initialize(params) ⇒ Query

It accepts a two dimensional hash: => ‘questionSearch’, :query_params =>

{:appid => 'YahooDemo', :query => 'Haus'}



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# File 'lib/yanapi/query.rb', line 21

def initialize(params)
  @method = params[:method]
  @params = check_params(params[:query_params])
  @url = build_url(@params)
  @output = @params[:output] || 'xml'            
end

Instance Method Details

#get ⇒ Object

main method



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# File 'lib/yanapi/query.rb', line 29

def get
  http_response = Net::HTTP.get_response(@url)
  
  case @output
  when 'xml'
    # Set the value to STRICT (0), otherwise no errors will be raised!
    xml = Nokogiri::XML::Document.parse(http_response.body, nil, nil, 0)
    result = prove_xml(xml) ? http_response.body : nil
  when 'json'
    raise NotImplementedError, 'We do not handle JSON yet!'
  when 'php'
    raise NotImplementedError, 'We do not handle PHP yet!'
  when 'rss'
    raise NotImplementedError, 'We do not handle RSS yet!'
  end

  # TODO: make a fine grained distinction
  case http_response
  when Net::HTTPSuccess
    return result

  when Net::HTTPBadRequest,
    Net::HTTPForbidden,
    Net::HTTPServiceUnavailable
    raise ExternalError.new("#{http_response}:\n\n#{result}")
  else
    raise ExternalError.new("#{http_response}:\n\n#{result}")
  end

# are all external errors caught here?
rescue Net::HTTPError, SocketError, Timeout::Error,
       IOError, SystemCallError => e
  raise ExternalError, e
# add JSON, PHP, RSS errors here
rescue Nokogiri::XML::SyntaxError => e
  raise ContentError.new(e)
end