Implement FileUtils#contains.

            }

        }

    }

    /**

     * Test if a file lives under the given directory, either as a direct child

     * or a distant grandchild.

     * <p>

     * Both files <em>must</em> have been resolved using

     * {@link File#getCanonicalFile()} to avoid symlink or path traversal

     * attacks.

     */

    public static boolean contains(File dir, File file) {

        String dirPath = dir.getAbsolutePath();

        String filePath = file.getAbsolutePath();

        if (dirPath.equals(filePath)) {

            return true;

        }

        if (!dirPath.endsWith("/")) {

            dirPath += "/";

        }

        return filePath.startsWith(dirPath);

    }

}