RFR: 8350880: (zipfs) Add support for read-only zip file systems [v6]

[Jaikiran Pai]

On Mon, 19 May 2025 12:15:38 GMT, David Beaumont <duke at openjdk.org> wrote:

>> Adding read-only support to ZipFileSystem.
>> 
>> The new `accessMode` environment property allows for readOnly and readWrite values, and ensures that the requested mode is consistent with what's returned.
>> 
>> This involved a little refactoring to ensure that "read only" state was set initially and only unset at the end of initialization if appropriate.
>> 
>> By making 2 methods return values (rather than silently set non-final fields as a side effect) it's now clear in what order fields are initialized and which are final (sadly there are still non-final fields, but only a split of this class into two types can fix that, since determining multi-jar support requires reading the file system).
>
> David Beaumont has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixed test.

test/jdk/jdk/nio/zipfs/TestPosix.java line 2:

> 1: /*
> 2:  * Copyright (c) 2019, 2025, SAP SE. All rights reserved.

For non-Oracle copyright lines like these, we don't edit them and instead we introduce a newline for the Oracle copyright year. So we should revert the change to this line and introduce the following new line just after this current one:

* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25178#discussion_r2095707195