In Jersey 1.x, you can use `ContainerRequest.getFormParameters()` to do request filtering on the form data, but I don't see an obvious equivalent in Jersey 2.x. I've implemented the `ContainerRequestFilter` interface which gives me access to a `ContainerRequestContext`, but from there how can get the form data?

Jersey 1.x example:

```
public class MyFilter implements ContainerRequestFilter {
  public ContainerRequest filter(ContainerRequest request) {
    Form f = request.getFormParameters();

    // examine form data and filter as needed
  }
}

```

Jersey 2.x example:

```
public class MyFilter implements ContainerRequestFilter {
  public void filter(ContainerRequestContext context) {
    // how do I get to the Form data now?
  }
}

```