module Backend

  class Redis

    class StringHash < Basic

      # Writes the hash into Redis.
      #
      # Note: We could use multi, but it did not help.
      #
      def dump hash
        clear
        hash.each_pair do |key, value|
          backend.hset namespace, key, value
        end
      end
      
      # Clears the hash.
      #
      def clear
        backend.del namespace
      end

      # Get a collection.
      #
      def collection sym
        raise "Can't retrieve a collection from a StringHash. Use Index::Redis::ListHash."
      end

      # Get a single value.
      #
      def member sym
        backend.hget namespace, sym
      end

    end

  end

end