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8283417: Update java.nio buffers to use sealed classes

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Reviewed-by: rriggs, darcy, iris, alanb
This commit is contained in:
Brian Burkhalter 2022-03-24 16:11:57 +00:00
parent 19f01ab701
commit b36cf35ad9
7 changed files with 45 additions and 8 deletions
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14
src/java.base/share/classes/java/nio/X-Buffer.java.template
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -264,9 +264,19 @@ import jdk.internal.util.ArraysSupport;
* @since 1.4
*/
public abstract class $Type$Buffer
public abstract sealed class $Type$Buffer
extends Buffer
implements Comparable<$Type$Buffer>{#if[char]?, Appendable, CharSequence, Readable}
permits
#if[byte]
Heap$Type$Buffer, MappedByteBuffer
#else[byte]
#if[char]
StringCharBuffer,
#end[char]
Heap$Type$Buffer, Direct$Type$BufferS, Direct$Type$BufferU,
ByteBufferAs$Type$BufferB, ByteBufferAs$Type$BufferL
#end[byte]
{
// Cached array base offset
private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset($type$[].class);