# File actionpack/lib/action_controller/middleware_stack.rb, line 14
14:       def initialize(klass, *args, &block)
15:         @klass = klass
16: 
17:         options = args.extract_options!
18:         if options.has_key?(:if)
19:           @conditional = options.delete(:if)
20:         else
21:           @conditional = true
22:         end
23:         args << options unless options.empty?
24: 
25:         @args = args
26:         @block = block
27:       end

    # File actionpack/lib/action_controller/middleware_stack.rb, line 4
 4:       def self.new(klass, *args, &block)
 5:         if klass.is_a?(self)
 6:           klass
 7:         else
 8:           super
 9:         end
10:       end

    # File actionpack/lib/action_controller/middleware_stack.rb, line 51
51:       def ==(middleware)
52:         case middleware
53:         when Middleware
54:           klass == middleware.klass
55:         when Class
56:           klass == middleware
57:         else
58:           klass == middleware.to_s.constantize
59:         end
60:       end

    # File actionpack/lib/action_controller/middleware_stack.rb, line 41
41:       def active?
42:         return false unless klass
43: 
44:         if @conditional.respond_to?(:call)
45:           @conditional.call
46:         else
47:           @conditional
48:         end
49:       end

    # File actionpack/lib/action_controller/middleware_stack.rb, line 68
68:       def build(app)
69:         if block
70:           klass.new(app, *build_args, &block)
71:         else
72:           klass.new(app, *build_args)
73:         end
74:       end

    # File actionpack/lib/action_controller/middleware_stack.rb, line 62
62:       def inspect
63:         str = klass.to_s
64:         args.each { |arg| str += ", #{arg.inspect}" }
65:         str
66:       end

    # File actionpack/lib/action_controller/middleware_stack.rb, line 29
29:       def klass
30:         if @klass.respond_to?(:call)
31:           @klass.call
32:         elsif @klass.is_a?(Class)
33:           @klass
34:         else
35:           @klass.to_s.constantize
36:         end
37:       rescue NameError
38:         @klass
39:       end