Class: Currency::Currency::Factory

Inherits:
Object
  • Object
show all
Defined in:
lib/currency/currency/factory.rb

Overview

Responsible for creating Currency::Currency objects on-demand.

Constant Summary collapse

@@default = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*opts) ⇒ Factory

Returns a new instance of Factory.



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# File 'lib/currency/currency/factory.rb', line 19

def initialize(*opts)
  @currency_by_code = { }
  @currency_by_symbol = { }
  @currency = nil
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sel, *args, &blk) ⇒ Object

If selector is [A-Z][A-Z], load the currency.

factory.USD
=> #<Currency::Currency:0xb7d0917c @formatter=nil, @scale_exp=2, @scale=100, @symbol="$", @format_left=-3, @code=:USD, @parser=nil, @format_right=-2>



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# File 'lib/currency/currency/factory.rb', line 110

def method_missing(sel, *args, &blk)
  if args.size == 0 && (! block_given?) && /^[A-Z][A-Z][A-Z]$/.match(sel.to_s)
    self.get_by_code(sel)
  else
    super
  end
end

Class Method Details

.default ⇒ Object

Returns the default Currency::Factory.



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# File 'lib/currency/currency/factory.rb', line 10

def self.default
  @@default ||= self.new
end

.default=(x) ⇒ Object

Sets the default Currency::Factory.



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# File 'lib/currency/currency/factory.rb', line 14

def self.default=(x)
  @@default = x
end

Instance Method Details

#currency ⇒ Object

Returns the default Currency. Defaults to self.get_by_code(:USD).



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# File 'lib/currency/currency/factory.rb', line 94

def currency
  @currency ||= self.get_by_code(:USD)
end

#currency=(x) ⇒ Object

Sets the default Currency.



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# File 'lib/currency/currency/factory.rb', line 100

def currency=(x)
  @currency = x
end

#get_by_code(x) ⇒ Object

Lookup Currency by code.



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# File 'lib/currency/currency/factory.rb', line 27

def get_by_code(x)
  x = ::Currency::Currency.cast_code(x)
  # $stderr.puts "get_by_code(#{x})"
  @currency_by_code[x] ||= install(load(::Currency::Currency.new(x)))
end

#get_by_symbol(symbol) ⇒ Object

Lookup Currency by symbol.



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# File 'lib/currency/currency/factory.rb', line 35

def get_by_symbol(symbol)
  @currency_by_symbol[symbol] ||= install(load(::Currency::Currency.new(nil, symbol)))
end

#install(currency) ⇒ Object

Installs a new Currency for #get_by_symbol and #get_by_code.

Raises:



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# File 'lib/currency/currency/factory.rb', line 85

def install(currency)
  raise ::Currency::Exception::UnknownCurrency.new() unless currency
  @currency_by_symbol[currency.symbol] ||= currency unless currency.symbol.nil?
  @currency_by_code[currency.code] = currency
end

#load(currency) ⇒ Object

This method initializes a Currency object as requested from #get_by_code or #get_by_symbol.

This method must initialize:

currency.code
currency.scale

Optionally:

currency.symbol
currency.symbol_html

Subclasses that provide Currency metadata should override this method. For example, loading Currency metadata from a database or YAML file.



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# File 'lib/currency/currency/factory.rb', line 55

def load(currency)
  # $stderr.puts "BEFORE: load(#{currency.code})"

  # Basic
  if currency.code == :USD || currency.symbol == '$'
	# $stderr.puts "load('USD')"
    currency.code = :USD
    currency.symbol = '$'
    currency.scale = 100
  elsif currency.code == :CAD
    # $stderr.puts "load('CAD')"
    currency.symbol = '$'
    currency.scale = 100
  elsif currency.code == :EUR
    # $stderr.puts "load('CAD')"
    currency.symbol = nil
    currency.symbol_html = '&#8364;'
    currency.scale = 100
  else
    currency.symbol = nil
    currency.scale = 100
  end
  
  # $stderr.puts "AFTER: load(#{currency.inspect})"

  currency
end