Seal public abstract API classes that are not supposed to be extended.

Author: woess

truffle/src/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Location.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0
@@ -54,7 +54,7 @@
  * @see DynamicObject
  * @since 0.8 or earlier
  */
-public abstract class Location {
+public abstract sealed class Location permits LocationImpl {
     /**
      * Constructor for subclasses.
      *

truffle/src/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/LocationImpl.java

@@ -48,7 +48,7 @@
 
 /** @since 0.17 or earlier */
 @SuppressWarnings("deprecation")
-abstract class LocationImpl extends Location {
+abstract non-sealed class LocationImpl extends Location {
     /**
      * @since 0.17 or earlier
      */

truffle/src/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Property.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0
@@ -46,7 +46,7 @@
  *
  * @since 0.8 or earlier
  */
-public abstract class Property {
+public abstract sealed class Property permits PropertyImpl {
     /**
      * Constructor for subclasses.
      *

truffle/src/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Shape.java

@@ -78,7 +78,7 @@
  * @see Property
  * @since 0.8 or earlier
  */
-public abstract class Shape {
+public abstract sealed class Shape permits ShapeImpl {
     static final int OBJECT_FLAGS_MASK = 0x0000_ffff;
     static final int OBJECT_FLAGS_SHIFT = 0;
     static final int OBJECT_SHARED = 1 << 16;

truffle/src/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/ShapeImpl.java

@@ -80,7 +80,7 @@
  * @since 0.17 or earlier
  */
 @SuppressWarnings("deprecation")
-abstract class ShapeImpl extends Shape {
+abstract sealed class ShapeImpl extends Shape permits ShapeBasic, ShapeExt {
     /** Shape and object flags. */
     protected final int flags;