Class: Currency::Exchange::Rate::Source::Historical
- Defined in:
- lib/currency/exchange/rate/source/historical.rb
Overview
Gets historical rates from database using Active::Record. Rates are retrieved using Currency::Exchange::Rate::Source::Historical::Rate as a database record proxy.
See Currency::Exchange::Rate::Source::Historical::Writer for a rate archiver.
Defined Under Namespace
Classes: RateLoader, Writer
Instance Attribute Summary collapse
-
#source ⇒ Object
Select specific rate source.
Attributes inherited from Base
#pivot_currency, #time_quantitizer, #verbose
Instance Method Summary collapse
- #clear_rates ⇒ Object
-
#get_rate(c1, c2, time) ⇒ Object
Returns a Rate.
-
#get_rates(time = nil) ⇒ Object
Return a list of base Rates.
-
#get_raw_rates(time = nil) ⇒ Object
Return a list of raw rates.
-
#initialize(*opt) ⇒ Historical
constructor
A new instance of Historical.
-
#name ⇒ Object
This Exchange’s name is the same as its #uri.
- #source_key ⇒ Object
Methods inherited from Base
#__subclass_responsibility, #clear_rate, #convert, #currencies, #get_rate_base, #new_rate, #normalize_time, #rate, #rates, #to_s
Constructor Details
#initialize(*opt) ⇒ Historical
Returns a new instance of Historical.
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# File 'lib/currency/exchange/rate/source/historical.rb', line 18 def initialize @source = nil # any super end |
Instance Attribute Details
#source ⇒ Object
Select specific rate source. Defaults to nil
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# File 'lib/currency/exchange/rate/source/historical.rb', line 16 def source @source end |
Instance Method Details
#clear_rates ⇒ Object
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# File 'lib/currency/exchange/rate/source/historical.rb', line 42 def clear_rates @rates_cache.clear @raw_rates_cache.clear super end |
#get_rate(c1, c2, time) ⇒ Object
Returns a Rate.
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# File 'lib/currency/exchange/rate/source/historical.rb', line 50 def get_rate(c1, c2, time) # rate = get_rates(time).select{ | r | r.c1 == c1 && r.c2 == c2 }[0] # $stderr.puts "#{self}.get_rate(#{c1}, #{c2}, #{time.inspect}) => #{rate.inspect}" # rate end |
#get_rates(time = nil) ⇒ Object
Return a list of base Rates.
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# File 'lib/currency/exchange/rate/source/historical.rb', line 59 def get_rates(time = nil) @rates_cache["#{source_key}:#{time}"] ||= get_raw_rates(time).collect do | rr | rr.to_rate end end |
#get_raw_rates(time = nil) ⇒ Object
Return a list of raw rates.
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# File 'lib/currency/exchange/rate/source/historical.rb', line 68 def get_raw_rates(time = nil) @raw_rates_cache["#{source_key}:#{time}"] ||= ::Currency::Exchange::Rate::Source::Historical::Rate.new(:c1 => nil, :c2 => nil, :date => time, :source => source). find_matching_this(:all) end |
#name ⇒ Object
This Exchange’s name is the same as its #uri.
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# File 'lib/currency/exchange/rate/source/historical.rb', line 30 def name "historical #{source_key}" end |
#source_key ⇒ Object
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# File 'lib/currency/exchange/rate/source/historical.rb', line 24 def source_key @source ? @source.join(',') : '' end |