On Thu, 25 Aug 2022 13:36:01 GMT, Marius Hanl <[email protected]> wrote:
>> modules/javafx.graphics/src/main/java/javafx/scene/Node.java line 1919:
>>
>>> 1917: }
>>> 1918: }
>>> 1919: }
>>
>> Because we can use Java 17 now, you can use pattern matching for
>> `instanceof`. Also, from what I see, `getChildren()` can never return
>> `null`. So, we can write
>>
>> if (Node.this instanceof Parent parent) {
>> parent.getChildren().forEach(child -> child.updateDisabled());
>> }
>
> Since `getChildren()` is not final, one can easily override it and return
> null.
> Therefore, this check should still be done here.
> Maybe we even need to check that every child is not null, since again I can
> override `getChildren()` and return a list that allows null. (The default
> implementation in `Parent` throws an exception when adding a null child)
>
> Interestingly, the javadoc of `getChildren()` states that one should call the
> super method when overriding (although this can't be enforced). So this is
> probably a hypothetical case.
It's definitely a hypothetical case. `getChildren()` is called all over the
place in JavaFX without a null check, so I see no reason for null checks here.
-------------
PR: https://git.openjdk.org/jfx/pull/841
