lib/fixer/feed.rb in fixer-0.4 vs lib/fixer/feed.rb in fixer-0.5.0

@@ -1,27 +1,48 @@
+require 'net/http'
 require 'nokogiri'
-require 'open-uri'
 
 module Fixer
-  class Feed
-    def initialize(type)
-      @type = type
-    end
+   class Feed
+     include Enumerable
 
-    def get
-      doc = Nokogiri::XML(feed)
-      doc.xpath('/gesmes:Envelope/xmlns:Cube/xmlns:Cube', doc.root.namespaces).map do |node|
-        Builder.new(node).build
-      end
-    end
+     FEEDS = {
+       current:     'daily',
+       ninety_days: 'hist-90d',
+       historical:  'hist'
+     }
 
-    private
+     def initialize(feed = :current)
+       @feed = FEEDS[feed] or raise ArgumentError
+     end
 
-    def feed
-      open(path).read
-    end
+     def each(&block)
+       xml
+         .xpath('/gesmes:Envelope/xmlns:Cube/xmlns:Cube', namespaces)
+         .each do |day|
+           day.xpath('./xmlns:Cube').each do |fx|
+             yield date:     day['time'],
+                   iso_code: fx['currency'],
+                   rate:     Float(fx['rate'])
+           end
+         end
+     end
 
-    def path
-      "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-#{@type}.xml"
-    end
-  end
+     private
+
+     def body
+       Net::HTTP.get uri
+     end
+
+     def namespaces
+       xml.root.namespaces
+     end
+
+     def uri
+       URI "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-#{@feed}.xml"
+     end
+
+     def xml
+       Nokogiri::XML body
+     end
+   end
 end