On Wed, 3 Jan 2024 18:16:24 GMT, Joe Darcy <da...@openjdk.org> wrote:
> Since it doesn't seem possible to do so, I did not attempt to relay
> "non-sealed" information in this PR :-)
Naively, I thought that something like this is possible _in principle_; I might
be mistaken though:
diff --git a/src/java.base/share/classes/java/lang/Class.java
b/src/java.base/share/classes/java/lang/Class.java
index 851d65d06ad..014845860d0 100644
--- a/src/java.base/share/classes/java/lang/Class.java
+++ b/src/java.base/share/classes/java/lang/Class.java
@@ -4771,6 +4771,30 @@ public boolean isSealed() {
return getPermittedSubclasses() != null;
}
+ private boolean isNonSealed() {
+ if (isSealed())
+ return false;
+ if (!isInterface() && Modifier.isFinal(getModifiers())) {
+ // unlike interface, class can be final
+ return false;
+ }
+ // if an ancestor is sealed, this class can either be non-sealed or
final
+ return hasSealedAncestor(this);
+ }
+
+ private boolean hasSealedAncestor(Class<?> clazz) {
+ var superclass = clazz.getSuperclass();
+ if (superclass != null) {
+ if (superclass.isSealed() || hasSealedAncestor(superclass))
+ return true;
+ }
+ for (var superinterface : clazz.getInterfaces()) {
+ if (superinterface.isSealed() || hasSealedAncestor(superinterface))
+ return true;
+ }
+ return false;
+ }
+
private native Class<?>[] getPermittedSubclasses0();
/*
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/17239#discussion_r1440867004
