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vendor/rails/actionmailer/lib/action_mailer/adv_attr_accessor.rb

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module ActionMailer

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  module AdvAttrAccessor #:nodoc:

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    def self.included(base)

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      base.extend(ClassMethods)

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    end

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    module ClassMethods #:nodoc:

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      def adv_attr_accessor(*names)

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        names.each do |name|

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          ivar = "@#{name}"

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          define_method("#{name}=") do |value|

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            instance_variable_set(ivar, value)

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          end

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          define_method(name) do |*parameters|

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            raise ArgumentError, "expected 0 or 1 parameters" unless parameters.length <= 1

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            if parameters.empty?

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              if instance_variable_names.include?(ivar)

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                instance_variable_get(ivar)

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              end

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            else

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              instance_variable_set(ivar, parameters.first)

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            end

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          end

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        end

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      end

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    end

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  end

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end

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