lib/bmg/operator/rename.rb in bmg-0.5.0 vs lib/bmg/operator/rename.rb in bmg-0.6.0

@@ -12,22 +12,21 @@
     # Keys of the renaming Hash SHOULD be existing attributes of the
     # input tuples. Values of the renaming Hash SHOULD NOT be existing
     # attributes of the input tuples.
     #
     class Rename
-      include Operator
+      include Operator::Unary
 
       def initialize(type, operand, renaming)
         @type = type
         @operand = operand
         @renaming = renaming
       end
-      attr_reader :type
 
     private
 
-      attr_reader :operand, :renaming
+      attr_reader :renaming
 
     public
 
       def each
         @operand.each do |tuple|
@@ -63,9 +62,15 @@
 
     protected ### optimization
 
       def _restrict(type, predicate)
         operand.restrict(predicate.rename(reverse_renaming)).rename(renaming)
+      end
+
+    protected ### inspect
+
+      def args
+        [ renaming ]
       end
 
     private
 
       def rename(tuple, renaming)