Class: IBGE

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ 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 



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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