Jeffrey Jeffrey - 1 month ago 6
Java Question

Find the directory for a FileStore

I'm trying to find a way to detect when a flash drive has been plugged into my computer. So far, the solution I found was to poll

for changes. This does indeed tell me when the flash drive has been inserted, but as far as I can tell there is no way to retrieve the location for it.
FileStore#type
and
FileStore#name
both seem highly unreliable as their return value is implementation specific, but they appear to be the only methods that might return any relevant information that might help find the directory for the
FileStore
.

With that in mind, the following code:

public class Test {
public static void main(String[] args) throws IOException {
for (FileStore store : FileSystems.getDefault().getFileStores()) {
System.out.println(store);
System.out.println("\t" + store.name());
System.out.println("\t" + store.type());
System.out.println();
}
}
}


Gave me this output:

/ (/dev/sda5)
/dev/sda5
ext4

/* snip */

/media/TI103426W0D (/dev/sda2)
/dev/sda2
fuseblk

/media/flashdrive (/dev/sdb1)
/dev/sdb1
vfat


As it turns out,
FileStore#type
returns the format of the drive and
FileStore#name
returns the location of the device file for the drive. As far as I can tell, the only method which has the location of the drive is the
toString
method, but extracting the path name out of it seems dangerous because I'm not sure how well that particular solution would hold up on other operating systems and future versions of Java.

Is there something I'm missing here or is this simply not possible purely with Java?

System Information:

$ java -version
java version "1.7.0_03"
OpenJDK Runtime Environment (IcedTea7 2.1.1pre) (7~u3-2.1.1~pre1-1ubuntu2)
OpenJDK Client VM (build 22.0-b10, mixed mode, sharing)

$ uname -a
Linux jeffrey-pc 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 UTC 2012 i686 athlon i386 GNU/Linux

Answer

Here's a temporary work around until a better solution is found:

public Path getRootPath(FileStore fs) throws IOException {
    Path media = Paths.get("/media");
    if (media.isAbsolute() && Files.exists(media)) { // Linux
        try (DirectoryStream<Path> stream = Files.newDirectoryStream(media)) {
            for (Path p : stream) {
                if (Files.getFileStore(p).equals(fs)) {
                    return p;
                }
            }
        }
    } else { // Windows
        IOException ex = null;
        for (Path p : FileSystems.getDefault().getRootDirectories()) {
            try {
                if (Files.getFileStore(p).equals(fs)) {
                    return p;
                }
            } catch (IOException e) {
                ex = e;
            }
        }
        if (ex != null) {
            throw ex;
        }
    }
    return null;
}

As far as I know, this solution will only work for Windows and Linux systems.

You have to catch the IOException in the Windows loop because if there is no CD in the CD drive an exception is thrown when you try to retrieve the FileStore for it. This might happen before you iterate over every root.