Files.walkFileTree() visits a file leading to a loop with LOOP_DETECT option enabled

[Rajendra Gutupalli]

Hi Alan,

I have a entry in directory structure that references ancestor of the 
directory (this is a loop according to spec) but still it is being 
visited by Files.walkFileTree().
I created a directory structure as follows.  /java/DirA/dirClink is a 
link file which points to /java/DirB/DirC and /java/DirB/DirC/dirBlink 
points to /java/DirB.
Actually if there is link which points to ancestor that is not being 
visited by Files.walkFileTree(). Here is the scenario where it visits.

Directory Structure:
/java
     DirA
            dirClink -> /java/DirB/DirC
     DirB
            DirC
                   dirBlink -> /java/DirB/  (This is the link which 
should not be visited at all)

When I run code with all FileVisitOptions, I got the following print

bash-3.00$ ./jdk1.7.0/bin/java TreeTest03 /java/DirA
pre dir /java/DirA
pre dir /java/DirA/dirClink
pre dir /java/DirA/dirClink/dirBlink 
post dir /java/DirA/dirClink/dirBlink
post dir /java/DirA/dirClink
post dir /java/DirA

So my query here is-  Should pre and post VisitDirectory() be opened for 
the loop file /java/DirA/dirClink/dirBlink?

 >> when I run the code with /java/DirB input , then  the pre and post 
VisitDirectory() methods will not be called for the loop file 
/java/DirB/dirBlink

bash-3.00$ ./jdk1.7.0/bin/java TreeTest03 /java/DirB
pre dir /java/DirB
pre dir /java/DirB/DirC
post dir /java/DirB/DirC
post dir /java/DirB


Thanks
Rajendra.