Need example of putting filter in Restlet Component

Question

I have a Restlet (v2.1.1) component that is using a ServerResource to process HTTP GET requests. I would like to put filters and/or routers into the component so that they can do some processing before the request gets to the ServerResource. I have been searching the Internet for an example of doing this, as well as reading the "Restlet in Action" book. I have discovered something interesting: There are plenty of examples of how to set up a ServerResource within a component. There are plenty of examples of how to create and set up filters and routers. Unfortunately, search as I might, through the book and on the Internet, I cannot find an example of using both! According to the book and the tutorials on the Internet, we should be able to create a component, set up a ServerResource in the component, and use a filter to preprocess requests that go to the ServerResource. None of the documentation anywhere seems to tell us exactly how to do this. Am I misreading everything? Is there reall…

Accepted Answer

You need to attach the filter to the router and then attach the ServerResource to the filter using the method `setNext(Class<? extends ServerResource> targetClass)`:

```
Filter myFilter = new MyFilter(getContext());
myFilter.setNext(MyServerResource.class);
router.attach("/test", myFilter);
```

Now you can preprocess using the filter's `beforeHandle(Request request, Response response)` method. If you return `CONTINUE` in this method, the filter will pass the request to the ServerResource.

Need example of putting filter in Restlet Component

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