How to get an instance of sun.nio.fs.UnixFileSystem on a Windows machine?

Question

In particular, I'd like to use the (unfortunately not visible) sun.nio.fs.Globs.toUnixRegexPattern(String glob).

Ok, stepping back and giving a bit of context

I have an iterator of pathes into a remote, unix-like file system (think ssh unixhost find path -type f). I also have a user-supplied glob pattern which I now want to match each path against.

On a unix machine, the following works just fine:

matcher = FileSystems.getDefault().getPathMatcher("glob:" + glob);
// ...
for (String s : remoteFind(...)) {
    if (matcher.matches(Paths.get(s))) {
       // matches, do something
    }
}

But when this is run on Windows, the same program totally fails because the FileSystems.getDefault() returns a Windows filesystem (the horror, the horror) and '\' is used as separator, etc. You get the picture. Nothing matches.

Of course I can stop all this nonsense and just rewrite (or rather, copy) sun.nio.fs.Globs.toUnixRegexPattern(String glob), but is there another, more elegant way?

Answer 1

Ok, so just to close this question, as stated in the comments I ended up writing a method in my FileUtil that is almost verbatim a copy of sun.nio.fs.Globs.toUnixRegexPattern(String glob). Works great.

If somebody finds a better way please add a different answer here.

Answer 2

If you do not make any file system operations locally, you could try to set

 -Dfile.separator=/

system variable to mimic the unix path separator. This variable should be passed to JVM on startup

Answer 3

As sun.nio.fs.UnixFileSystem is not even part of my Windows JDK, I went one step back and looked for FileSystemProviders that are available on all platforms. So I found JrtFileSystemProvider, which can be (mis-)used to get a Unix-like path matcher on Windows (the following is copy & paste from some Kotlin code, but you get the idea):

val jrtFileSystem = FileSystems.getFileSystem(URI("jrt:/"))
// ...
val pattern = "..."
val matcher = jrtFileSystem.getPathMatcher("glob:$pattern")
// ...
matcher.matches(jrtFileSystem.getPath("path/to/match"))