/** * Returns the parent directory of <code>dir</code>. * * @param dir the <code>File</code> being queried * @return the parent directory of <code>dir</code>, or <code>null</code> if <code>dir</code> is * <code>null</code> */ public File getParentDirectory(File dir) { if (dir == null || !dir.exists()) { return null; } ShellFolder sf; try { sf = getShellFolder(dir); } catch (FileNotFoundException e) { return null; } File psf = sf.getParentFile(); if (psf == null) { return null; } if (isFileSystem(psf)) { File f = psf; if (!f.exists()) { // This could be a node under "Network Neighborhood". File ppsf = psf.getParentFile(); if (ppsf == null || !isFileSystem(ppsf)) { // We're mostly after the exists() override for windows below. f = createFileSystemRoot(f); } } return f; } else { return psf; } }