RFR: 8254090: Collectors.toUnmodifiableList exposes shared secret

[Paul Sandoz]

On Thu, 8 Oct 2020 20:52:01 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Add check for ArrayList.class before passing it to the shared secret.

Marked as reviewed by psandoz (Reviewer).

src/java.base/share/classes/java/util/stream/Collectors.java line 303:

> 301:                                    list -> {
> 302:                                        if (list.getClass() == ArrayList.class) { // ensure it's trusted
> 303:                                            return (List<T>)SharedSecrets.getJavaUtilCollectionAccess()

While we are in this method i think it should be possible to remove the all casts and the `@SuppressWarnings` (javac's
type inference got better after this method was added?).

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PR: https://git.openjdk.java.net/jdk/pull/569