RFR: 8283335 : Add exists and readAttributesIfExists methods to FileSystemProvider

[Alan Bateman]

On Wed, 22 Jun 2022 22:18:05 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> I think that this is the only use of `stat2()`. It could be deleted if this method were replaced with this:

The purpose of these additions to the SPI is to improve the performance of user facing methods that don't throw an exception when the file doesn't exist. It needs a stat/equivalent that doesn't throw so this is the reason for stat2. The equivalent on Windows will need to added too.

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