RFR JDK-8073924: Update test/java/nio/charset/Charset/NIOCharsetAvailability.java to work with module system

[Alan Bateman]

On 26/02/2015 02:47, Xueming Shen wrote:
> Please help review the change for JDK-8073924.
>
> issue: https://bugs.openjdk.java.net/browse/JDK-8073924
> webrev: http://cr.openjdk.java.net/~sherman/8073924/webrev
This looks okay although you should avoid walking the entire file system 
with:

   Path root1 = fs.getPath("/java.base/sun/nio.cs");
   Path root1 = fs.getPath("/jdk.charsets/sun/nio/cs/ext");
   Stream.concat(Files.walk(root1), Files.walk(root2))...

An alternative is of course Files.walkFileTree and FileVisitor that 
returns SKIP_SUBTREE.

One other thing to be aware if that jrt file system needs to change soon 
to have /modules and /packages top level directories. Sundar is working 
on that so I guess this test will need to be updated as part of that work.

-Alan