RFR: 8283335 : Add exists and readAttributesIfExists methods to FileSystemProvider [v2]

[Alan Bateman]

On Sun, 26 Jun 2022 11:13:58 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> Hi,
>> 
>> Please review the following patch which will:
>> 
>> - Enhance the java.nio.file.spi.FileSystemProvider abstract class to include the methods
>> 
>>   - public boolean exists(Path path, LinkOption... options)
>>   - public <A extends BasicFileAttributes> A readAttributesIfExists(Path path, Class<A> type, LinkOption... options)
>> 
>> 
>> This change allows for providers to provide optimizations when the file's attributes are not needed.
>> 
>> Mach5 tiers 1 - 3  run clean with this change
>> 
>> The CSR may be viewed at [JDK-8283336](https://bugs.openjdk.org/browse/JDK-8283336)
>> 
>> 
>> Best,
>> Lance
>
> Lance Andersen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updates based on review feedback

The implementation changes in latest version address my previous points, thanks!  I don't the test as it duplicates most of the existing of the TestProvider in this directory and the naming is inconsistent with the existing tests. I expect you should be able to just extent TestProvider and override the two methods to record that they can been called.

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PR: https://git.openjdk.org/jdk/pull/9249