RFR: 8283335 : Add exists and readAttributesIfExists methods to FileSystemProvider

[Lance Andersen]

On Wed, 22 Jun 2022 22:26:23 GMT, Brian Burkhalter <bpb 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
>
> src/java.base/share/classes/java/nio/file/spi/FileSystemProvider.java line 1236:
> 
>> 1234:      * atomic operation with respect to other file system operations.
>> 1235:      *
>> 1236:      *  @implSpec
> 
> One more bad indentation.

fixed in next push

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