Create instance of anonymous class with SPOON

I need to pass an instance of an anonymous class as a function parameter, in Spoon. In my case I have an anonymous Comparator that I need to pass to a function that gets Comparator<?> as a parameter.

Here's my code:

public boolean isToBeProcessed(CtType<?> candidate) {
        if(candidate instanceof CtClass<?> && ((CtClass<?>)candidate).isAnonymous()==true){
            CtClass<?> clas = (CtClass<?>)candidate;
            List<CtMethod<?>> list = clas.filterChildren(
                  new AbstractFilter<CtMethod<?>>(CtMethod.class) {
                    @Override
                    public boolean matches(CtMethod<?> method) {
                      return method.getSimpleName().equals("compare");
                    }
                  }
                ).list();
        return !(list==null || list.isEmpty());
        }
        return false;
    }
    
    @Override
    public void process(CtType<?> element) {
        // here I need to pass the anonymous Comparator class
        testComparator( ??? ); 
    }

    public void testComparator(Comparator<?> comparator) {
      ......
    }

I'm new to Spoon and I would appreciate your help with this.

Thanks.