java.nio.file.spi.AbstractPath?

[Vince Bonfanti]

The JavaDocs list an AbstractPath class, but I can't find an
implementation anywhere:

    http://java.sun.com/javase/7/docs/api/java/nio/file/spi/AbstractPath.html

I've downloaded the May 19, 2009 binary snapshot (b101?) from the NIO2
project page, and also the August 20, 2009 source bundle (b70?) from
the OpenJDK download page, but neither contains AbstractPath.

BTW, which of these is the latest? In general, what's the best way to
get the latest source (other than via Mercurial--I have no experience
with Mercurial--and I'm not sure I need to be that close to the
bleeding edge anyway). Thanks.

Vince