Class: IBGE

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ IBGE

Returns a new instance of IBGE.



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# File 'lib/eia/ibge.rb', line 6

def initialize()
    @webservice_url = 'http://api.sidra.ibge.gov.br' 
end

Instance Method Details

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/eia/ibge.rb', line 10

def connected?()
  response = Net::HTTP.get(URI(@webservice_url + '/values/t/1612/n1/1'))

  if response.to_s == '' then
    return false
  else
    return true
  end
end

#consume_json(json_string, table_code) ⇒ Object 



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# File 'lib/eia/ibge.rb', line 66

def consume_json(json_string, table_code)
  begin
    output = JSON.parse(json_string)
    heading = output.delete_at(0)
    identifier = heading["D1N"]

    if identifier.include? "Trimestre Móvel" then 
      periodicity = 6
    elsif identifier.eql? "Trimestre" then
      periodicity = 4
    elsif identifier.include? "Ano" then
      periodicity = 5
    elsif identifier.include? "Mês" then
      periodicity = 2
    else
      puts "Error! Unexpected case! Found is: #{identifier}. Report to the dev team."
      return Array.new
    end

    data_array = Array.new

    output.each do |hash|
      data = nil
      date = nil
      variable = nil
      classification = Array.new
      location = nil
      unit = nil
      val = nil

      hash.each do |key, value|
        case key
          when "D1C" #date
            date = value
          when "D2N" #variable
            variable = value
          when "D3N" #location
            location = value
          when "MN" #unit
            unit = value
          when "V" #value
            val = value.to_f
          else
            if key.include? "D" and key.include? "N" and key[1].to_i > 3 then
              classification << "#{heading[key]}: #{value}"
            end
            #Else this information is discarded
        end
      end

      data_array << DataIBGE.new(table_code, date, variable, location, 
                                 classification, unit, val, periodicity)
    end 
    
    return data_array 

  rescue Exception => e
    if e.to_s.include? "incompatível com a tabela" then
      return Array.new
    else
      puts "Error parsing the JSON response: #{e}\nTrace: #{e.backtrace}"
      return nil
    end
  end
end

#get_series(code, period, variables, territorial_level, classification) ⇒ Object

string form specifying terriories classification : a string in the form c_lvl_k | list_of_products; c_lvl_j | list_of_products; …



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# File 'lib/eia/ibge.rb', line 28

def get_series(code, period, variables, territorial_level, classification)
  url = @webservice_url + "/values"

  if code != '' and code != nil then
    url += "/t/#{code}"
  end

  if period != '' and period != nil then
    url += "/p/#{period}"
  else
    url += "/p/all"
  end

  if variables != '' and variables != nil then
    url += "/v/#{variables}"
  else
    url += "/v/all"
  end

  if territorial_level != '' and territorial_level != nil then
    territorial_level.split(';').each do |word|
      ws = word.split('|')
      url += "/n#{ws[0]}/#{ws[1]}" 
    end
  else
    url += "/n1/all"
  end
  
  if classification != '' and classification != nil then
    classification.split(';').each do |word|
      ws = word.split('|')
      url += "/c#{ws[0]}/#{ws[1]}"
    end
  end

  return consume_json(Net::HTTP.get(URI(url)), code)
end