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  1. class ConcreteDecorator {
  2.     decoratedVisitor: Visitor
  3.  
  4.     visitLeaf(leaf) {
  5.         // Do some stuff before
  6.         result := decoratedVisitor.visitLeaf(leaf)
  7.         // Do some stuff after
  8.         return result;
  9.     }
  10.  
  11.     visitComposite(composite) {
  12.         // Do some stuff before
  13.         result := decoratedVisitor.visitComposite(leaf)
  14.         // Do some stuff after
  15.         return result;
  16.     }
  17. }
  18.    
  19. visitor := new ConcreteVisitorA()
  20. visitor := new ConcreteDecoratorA(visitor)
  21. Visitor := new ConcreteDecoratorB(visitor)
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