RFR: 8263514: Minor issue in JavacFileManager.SortFiles.REVERSE

[Aleksey Shipilev-5]

SonarCloud reports the problem in  JavacFileManager.SortFiles.REVERSE definition:
 Neither "Math.abs" nor negation should be used on numbers that could be "MIN_VALUE"

        REVERSE {
            @Override
            public int compare(Path f1, Path f2) {
                return -f1.getFileName().compareTo(f2.getFileName());
            }
        }

Since `compareTo` can technically return `MIN_VALUE`, we cannot simply negate it. Luckily, we can just swap the `f1` and `f2` comparison order to achieve the same effect without exposing us to this corner case.

-------------

Commit messages:
 - 8263514: Minor issue in JavacFileManager.SortFiles.REVERSE

Changes: https://git.openjdk.java.net/jdk/pull/2970/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2970&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263514
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2970.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2970/head:pull/2970

PR: https://git.openjdk.java.net/jdk/pull/2970

[Vicente Romero-3]

On Fri, 12 Mar 2021 13:52:51 GMT, Aleksey Shipilev <[hidden email]> wrote:

> SonarCloud reports the problem in  JavacFileManager.SortFiles.REVERSE definition:
>  Neither "Math.abs" nor negation should be used on numbers that could be "MIN_VALUE"
>
>         REVERSE {
>             @Override
>             public int compare(Path f1, Path f2) {
>                 return -f1.getFileName().compareTo(f2.getFileName());
>             }
>         }
>
> Since `compareTo` can technically return `MIN_VALUE`, we cannot simply negate it. Luckily, we can just swap the `f1` and `f2` comparison order to achieve the same effect without exposing us to this corner case.

looks good

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Marked as reviewed by vromero (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2970

[Aleksey Shipilev-5]

On Mon, 15 Mar 2021 17:22:12 GMT, Vicente Romero <[hidden email]> wrote:

>> SonarCloud reports the problem in  JavacFileManager.SortFiles.REVERSE definition:
>>  Neither "Math.abs" nor negation should be used on numbers that could be "MIN_VALUE"
>>
>>         REVERSE {
>>             @Override
>>             public int compare(Path f1, Path f2) {
>>                 return -f1.getFileName().compareTo(f2.getFileName());
>>             }
>>         }
>>
>> Since `compareTo` can technically return `MIN_VALUE`, we cannot simply negate it. Luckily, we can just swap the `f1` and `f2` comparison order to achieve the same effect without exposing us to this corner case.
>
> looks good

Thanks!

-------------

PR: https://git.openjdk.java.net/jdk/pull/2970

[Aleksey Shipilev-5]

On Fri, 12 Mar 2021 13:52:51 GMT, Aleksey Shipilev <[hidden email]> wrote:

> SonarCloud reports the problem in  JavacFileManager.SortFiles.REVERSE definition:
>  Neither "Math.abs" nor negation should be used on numbers that could be "MIN_VALUE"
>
>         REVERSE {
>             @Override
>             public int compare(Path f1, Path f2) {
>                 return -f1.getFileName().compareTo(f2.getFileName());
>             }
>         }
>
> Since `compareTo` can technically return `MIN_VALUE`, we cannot simply negate it. Luckily, we can just swap the `f1` and `f2` comparison order to achieve the same effect without exposing us to this corner case.

This pull request has now been integrated.

Changeset: 5ab52448
Author:    Aleksey Shipilev <[hidden email]>
URL:       https://git.openjdk.java.net/jdk/commit/5ab52448
Stats:     1 line in 1 file changed: 0 ins; 0 del; 1 mod

8263514: Minor issue in JavacFileManager.SortFiles.REVERSE

Reviewed-by: vromero

-------------

PR: https://git.openjdk.java.net/jdk/pull/2970