public static void loadLibraryFromJar()

in src/main/java/jsitter/interop/LibLoader.java [52:96]
33 lines of code
10 McCabe index (conditional complexity)

    public static void loadLibraryFromJar(String path) throws IOException {

        if (null == path || !path.startsWith("/")) {
            throw new IllegalArgumentException("The path has to be absolute (start with '/').");
        }

        // Obtain filename from path
        String[] parts = path.split("/");
        String filename = (parts.length > 1) ? parts[parts.length - 1] : null;

        // Check if the filename is okay
        if (filename == null || filename.length() < MIN_PREFIX_LENGTH) {
            throw new IllegalArgumentException("The filename has to be at least 3 characters long.");
        }

        // Prepare temporary file
        if (temporaryDir == null) {
            temporaryDir = createTempDirectory(NATIVE_FOLDER_PATH_PREFIX);
            temporaryDir.deleteOnExit();
        }

        File temp = new File(temporaryDir, filename);

        try (InputStream is = LibLoader.class.getResourceAsStream(path)) {
            Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException e) {
            temp.delete();
            throw e;
        } catch (NullPointerException e) {
            temp.delete();
            throw new FileNotFoundException("File " + path + " was not found inside JAR.");
        }

        try {
            System.load(temp.getAbsolutePath());
        } finally {
            if (isPosixCompliant()) {
                // Assume POSIX compliant file system, can be deleted after loading
                temp.delete();
            } else {
                // Assume non-POSIX, and don't delete until last file descriptor closed
                temp.deleteOnExit();
            }
        }
    }