# File lib/action_controller/filters.rb, line 504
        def find_or_create_filter(filter,position)
          if found_filter = find_filter(filter) { |f| f.send("#{position}?") }
            found_filter
          else
            f = class_for_filter(filter).new(filter)
            # apply proxy to filter if necessary
            case position
            when :before
              BeforeFilterProxy.new(f)
            when :after
              AfterFilterProxy.new(f)
            else
              f
            end
          end
        end