# module ActiveSupport::Memoizable

### Public Class Methods

extended(base) click to toggle source

    # File lib/active_support/memoizable.rb, line 7
    def self.extended(base)
      ActiveSupport::Deprecation.warn "ActiveSupport::Memoizable is deprecated and will be removed in future releases,"          "simply use Ruby memoization pattern instead.", caller
      super
    end

memoized_ivar_for(symbol) click to toggle source

    # File lib/active_support/memoizable.rb, line 13
    def self.memoized_ivar_for(symbol)
      "@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym
    end

### Public Instance Methods

memoize(*symbols) click to toggle source

    # File lib/active_support/memoizable.rb, line 66
        def memoize(*symbols)
          symbols.each do |symbol|
            original_method = :"_unmemoized_#{symbol}"
            memoized_ivar = ActiveSupport::Memoizable.memoized_ivar_for(symbol)

            class_eval "          include InstanceMethods                                                  # include InstanceMethods
                                                                                       #
              if method_defined?(:#{original_method})                                  # if method_defined?(:_unmemoized_mime_type)
                raise "Already memoized #{symbol}"                                     #   raise "Already memoized mime_type"
              end                                                                      # end
              alias #{original_method} #{symbol}                                       # alias _unmemoized_mime_type mime_type
                                                                                       #
              if instance_method(:#{symbol}).arity == 0                                # if instance_method(:mime_type).arity == 0
                def #{symbol}(reload = false)                                          #   def mime_type(reload = false)
                  if reload || !defined?(#{memoized_ivar}) || #{memoized_ivar}.empty?  #     if reload || !defined?(@_memoized_mime_type) || @_memoized_mime_type.empty?
                    #{memoized_ivar} = [#{original_method}]                            #       @_memoized_mime_type = [_unmemoized_mime_type]
                  end                                                                  #     end
                  #{memoized_ivar}[0]                                                  #     @_memoized_mime_type[0]
                end                                                                    #   end
              else                                                                     # else
                def #{symbol}(*args)                                                   #   def mime_type(*args)
                  #{memoized_ivar} ||= {} unless frozen?                               #     @_memoized_mime_type ||= {} unless frozen?
                  args_length = method(:#{original_method}).arity                      #     args_length = method(:_unmemoized_mime_type).arity
                  if args.length == args_length + 1 &&                                 #     if args.length == args_length + 1 &&
                    (args.last == true || args.last == :reload)                        #       (args.last == true || args.last == :reload)
                    reload = args.pop                                                  #       reload = args.pop
                  end                                                                  #     end
                                                                                       #
                  if defined?(#{memoized_ivar}) && #{memoized_ivar}                    #     if defined?(@_memoized_mime_type) && @_memoized_mime_type
                    if !reload && #{memoized_ivar}.has_key?(args)                      #       if !reload && @_memoized_mime_type.has_key?(args)
                      #{memoized_ivar}[args]                                           #         @_memoized_mime_type[args]
                    elsif #{memoized_ivar}                                             #       elsif @_memoized_mime_type
                      #{memoized_ivar}[args] = #{original_method}(*args)               #         @_memoized_mime_type[args] = _unmemoized_mime_type(*args)
                    end                                                                #       end
                  else                                                                 #     else
                    #{original_method}(*args)                                          #       _unmemoized_mime_type(*args)
                  end                                                                  #     end
                end                                                                    #   end
              end                                                                      # end
                                                                                       #
              if private_method_defined?(#{original_method.inspect})                   # if private_method_defined?(:_unmemoized_mime_type)
                private #{symbol.inspect}                                              #   private :mime_type
              elsif protected_method_defined?(#{original_method.inspect})              # elsif protected_method_defined?(:_unmemoized_mime_type)
                protected #{symbol.inspect}                                            #   protected :mime_type
              end                                                                      # end
    ", __FILE__, __LINE__ + 1
          end
        end