Module: SelectiveAttributeProxy

Included in:
AWS::S3::ACL::Grant, AWS::S3::ACL::Grantee, AWS::S3::ACL::Policy, AWS::S3::Logging::Status, AWS::S3::Owner, AWS::S3::S3Object
Defined in:
lib/aws/s3/extensions.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/aws/s3/extensions.rb', line 127

def self.included(klass)
  klass.extend(ClassMethods)
  klass.class_eval(<<-EVAL, __FILE__, __LINE__)
    # Default name for attribute storage
    @@attribute_proxy         = :attributes
    @@attribute_proxy_options = {:exclusively => true}
    
    def self.attribute_proxy
      @@attribute_proxy
    end
    
    def self.attribute_proxy_options
      @@attribute_proxy_options
    end
    
    private
      # By default proxy all attributes
      def proxiable_attribute?(name)
        return true unless self.class.attribute_proxy_options[:exclusively]
        send(self.class.attribute_proxy).has_key?(name)
      end
      
      def method_missing(method, *args, &block)
        # Autovivify attribute storage
        if method == self.class.attribute_proxy
          ivar = "@\#{method}"
          instance_variable_set(ivar, {}) unless instance_variable_get(ivar).is_a?(Hash)
          instance_variable_get(ivar)
        # Delegate to attribute storage
        elsif method.to_s =~ /^(\\w+)(=?)$/ && proxiable_attribute?($1)
          attributes_hash_name = self.class.attribute_proxy
          $2.empty? ? send(attributes_hash_name)[$1] : send(attributes_hash_name)[$1] = args.first
        else
          super
        end
      end
  EVAL
end