Contents

module Exlibris
  module Aleph
    # 
    # If a class is abstract, it can't be instantiated.
    # 
    module Abstract
      def self.included(klass)
        klass.class_eval do
          extend ClassAttributes
        end
      end

      module ClassAttributes
        def abstract
          @abstract ||= false
        end
        alias :abstract? :abstract

        attr_writer :abstract
        protected :abstract=
      end

      def initialize *args
        raise NotImplementedError.new("Cannot instantiate #{self.class.name}.  It is abstract") if self.class.abstract?
      end
    end
  end
end

Version data entries

10 entries across 10 versions & 1 rubygems

Version	Path
exlibris-aleph-1.1.0	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.8	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.7	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.6	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.5	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.4	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.3	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.2	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.1	lib/exlibris/aleph/abstract.rb
exlibris-aleph-1.0.0	lib/exlibris/aleph/abstract.rb