8273484: Cleanup unnecessary null comparison before instanceof check in java.naming

[turbanoff]

Update code checks both non-null and instance of a class in java.naming module classes.
The checks and explicit casts could also be replaced with pattern matching for the instanceof operator.
For example:
The following code:

    return (obj != null &&
            obj instanceof CompoundName &&
            impl.equals(((CompoundName)obj).impl));

Can be simplified to:

    return (obj instanceof CompoundName other) &&
            impl.equals(other.impl);

See similar cleanup in java.base - https://bugs.openjdk.java.net/browse/JDK-8258422

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8273484: Cleanup unnecessary null comparison before instanceof check in java.naming

Reviewers

• Aleksei Efimov (@AlekseiEfimov - Committer)
• Daniel Fuchs (@dfuch - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/5374/head:pull/5374
$ git checkout pull/5374

Update a local copy of the PR:
$ git checkout pull/5374
$ git pull https://git.openjdk.java.net/jdk pull/5374/head

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Checkout this PR locally:
$ git pr checkout 5374

View PR using the GUI difftool:
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Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/5374.diff

[bridgekeeper]

👋 Welcome back turbanoff! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@turbanoff The following label will be automatically applied to this pull request:

• core-libs

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[mlbridge]

Webrevs

• 01: Full - Incremental (4b1bc753)
• 00: Full (0c72cddc)

[AlekseiEfimov]

Hi Andrey,
The changes look good to me.
And it looks like there is one more method to cleanup: LdapReferralContext.setHopCount

[turbanoff]

Good catch! Improved.
Not sure why IDEA don't report such case. Created https://youtrack.jetbrains.com/issue/IDEA-277851

[AlekseiEfimov]

The latest version looks good to me.
Our CI system is also happy with this patch - no java.naming test failures observed.

[dfuch]

Nice simplification and usage of the new instanceof pattern. Thanks Andrey for this patch!
LGTM - Aleksei or I will sponsor this if needed.

[openjdk]

@turbanoff This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8273484: Cleanup unnecessary null comparison before instanceof check in java.naming

Reviewed-by: aefimov, dfuchs

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 92 new commits pushed to the master branch:

• f189dff: 8273595: tools/jpackage tests do not work on apt-based Linux distros like Debian
• 922e86f: 8273522: Rename test property vm.cds.archived.java.heap to vm.cds.write.archived.java.heap
• f42b927: 8273609: Fix trivial doc typos in the compiler area
• e4cd209: 8273611: Remove unused ProfilePrint_lock
• f690a01: 8273278: Support XSLT on GraalVM Native Image--deterministic bytecode generation in XSLT
• 5e1df2c: 8273162: AbstractSplittableWithBrineGenerator does not create a random salt
• d4177a9: 8273351: bad tag in jdk.random module-info.java
• ec9d1be: 8273194: Document the two possible cases when Lookup::ensureInitialized returns
• 81d2ace: 8273369: Computing micros between two instants unexpectedly overflows for some cases
• efe3ed1: 8273358: macOS Monterey does not have the font Times needed by Serif
• ... and 82 more: https://git.openjdk.java.net/jdk/compare/c640fe42c2b5e6668a2a875678be44443942c868...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@AlekseiEfimov, @dfuch) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[turbanoff]

/integrate

[openjdk]

@turbanoff
Your change (at version 4b1bc75) is now ready to be sponsored by a Committer.

[AlekseiEfimov]

/sponsor

[openjdk]

Going to push as commit 2ee1f96.
Since your change was applied there have been 92 commits pushed to the master branch:

• f189dff: 8273595: tools/jpackage tests do not work on apt-based Linux distros like Debian
• 922e86f: 8273522: Rename test property vm.cds.archived.java.heap to vm.cds.write.archived.java.heap
• f42b927: 8273609: Fix trivial doc typos in the compiler area
• e4cd209: 8273611: Remove unused ProfilePrint_lock
• f690a01: 8273278: Support XSLT on GraalVM Native Image--deterministic bytecode generation in XSLT
• 5e1df2c: 8273162: AbstractSplittableWithBrineGenerator does not create a random salt
• d4177a9: 8273351: bad tag in jdk.random module-info.java
• ec9d1be: 8273194: Document the two possible cases when Lookup::ensureInitialized returns
• 81d2ace: 8273369: Computing micros between two instants unexpectedly overflows for some cases
• efe3ed1: 8273358: macOS Monterey does not have the font Times needed by Serif
• ... and 82 more: https://git.openjdk.java.net/jdk/compare/c640fe42c2b5e6668a2a875678be44443942c868...master

Your commit was automatically rebased without conflicts.

[openjdk]

@AlekseiEfimov @turbanoff Pushed as commit 2ee1f96.

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