Class: CurrencySpy::DnbNord

Inherits:
Scraper
  • Object
show all
Defined in:
lib/currency_spy/dnb_nord.rb

Overview

Class designed to fetch data from DnB Nord’s website.

Constant Summary

Constants inherited from Scraper

Scraper::RATE_DATA

Instance Attribute Summary collapse

Attributes inherited from Scraper

#available_codes, #currency_code, #institution

Instance Method Summary collapse

Methods inherited from Scraper

#fetch_rates, #page

Constructor Details

#initialize ⇒ DnbNord

Constructor. Initializes the following:

  • url is set to nil

  • institution name

  • a list of currency codes available from that source

  • session_no number of the session. There are two sessions. 1 means the first at 8:15 am and 2 means the second one held at 12:15



12
13
14
15
16
17
18
 
# File 'lib/currency_spy/dnb_nord.rb', line 12

def initialize
  super
  @url = nil
  @institution = 'DnB Nord'
  @available_codes = %w(EUR USD GBP CHF DKK NOK SEK CZK JPY HUF CAD AUD LTL)
  @session_no = nil
end

Instance Attribute Details

#session_date ⇒ Object

Returns the value of attribute session_date.



5
6
7
 
# File 'lib/currency_spy/dnb_nord.rb', line 5

def session_date
  @session_date
end

#session_no ⇒ Object

Returns the value of attribute session_no.



5
6
7
 
# File 'lib/currency_spy/dnb_nord.rb', line 5

def session_no
  @session_no
end

Instance Method Details

#buy_rate ⇒ Object

Fetches the buying rate



40
41
42
43
44
45
46
47
48
49
 
# File 'lib/currency_spy/dnb_nord.rb', line 40

def buy_rate
  regexp = Regexp.new(currency_code)
  res = nil
  page.search("//td").each do |td|
    if (regexp.match(td.content))
      res = td.next_element.content.to_f
    end
  end
  return res
end

#rate_time ⇒ Object

Fetches the time of given rates



52
53
54
55
 
# File 'lib/currency_spy/dnb_nord.rb', line 52

def rate_time
  hour = @session_time == 2 ? "12:15" : "08:15"
  DateTime.parse(hour)
end

#sell_rate ⇒ Object

Fetches the selling rate



28
29
30
31
32
33
34
35
36
37
 
# File 'lib/currency_spy/dnb_nord.rb', line 28

def sell_rate
  regexp = Regexp.new(currency_code)
  res = nil
  page.search("//td").each do |td|
    if (regexp.match(td.content))
      res = td.next_element.next_element.content.to_f
    end
  end
  return res
end

#url ⇒ Object

Determines the correct url of the web page to fetch rates from based of the instance variable session_no



21
22
23
24
25
 
# File 'lib/currency_spy/dnb_nord.rb', line 21

def url
  dnb_session_no = @session_no ||= 1
  session_time = dnb_session_no == 2 ? "12:15" : "08:15"
  return "http://www.dnbnord.pl/pl/tabela-kursow-walut-dla-kredytow/go:godzina=#{session_time}"
end