RFR JDK-8066577: Cleanup and make better use of the stream API in the jrtfs code

[Paul Sandoz]

> On 27 Aug 2016, at 00:57, Alan Bateman <Alan.Bateman at oracle.com> wrote:
> 
> On 26/08/2016 17:48, Xueming Shen wrote:
> 
>> Hi,
>> 
>> This is a aged rfe from Paul's code review comments for the old code. base. The
>> implementation has been changed lots since.  Some has gone, some has been updated
>> accordingly. Just went through the list and here is the change set for some minor issues
>> still present.
>> 
>> issue: https://bugs.openjdk.java.net/browse/JDK-8066577
>> webrev: http://cr.openjdk.java.net/~sherman/8066577/webrev
> You might want to re-check the synchronization in JrtDirectoryStream, it looks the next/hasNext methods are synchronizing on the Iterator instance.
> 

Yes, i missed that. The Iterator will need to synchronize on its enclosing instance.

Paul.