module Crystal
  module Filters
    inherit Callbacks    
          
    module ClassMethods
      def before *args, &block
        opt = args.extract_options!
        if block       
          set_callback :action, :before, opt, &block
        else 
          args.each{|executor| set_callback :action, :before, executor, opt}        
        end
      end
      
      def around *args, &block
        opt = args.extract_options!
        if block       
          set_callback :action, :around, opt, &block
        else 
          args.each{|executor| set_callback :action, :around, executor, opt}        
        end
      end
      
      def after *args, &block
        opt = args.extract_options!
        if block       
          set_callback :action, :after, opt, &block
        else 
          args.each{|executor| set_callback :action, :after, executor, opt}        
        end
      end
    end
  end
end