DO NOT MERGE) ExifInterface: Make saveAttributes throw an exception before change

    private int mThumbnailOffset;

    private int mThumbnailLength;

    private byte[] mThumbnailBytes;

    private boolean mIsSupportedFile;

    // Pattern to check non zero timestamp

    private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*");

        try {

            InputStream in = new FileInputStream(mFilename);

            getJpegAttributes(in);

            mIsSupportedFile = true;

        } catch (IOException e) {

            // Ignore exceptions in order to keep the compatibility with the old versions of

            // ExifInterface.

            mIsSupportedFile = false;

            Log.w(TAG, "Invalid image.", e);

        } finally {

            addDefaultValuesForCompatibility();

     * and make a single call rather than multiple calls for each attribute.

     */

    public void saveAttributes() throws IOException {

        if (!mIsSupportedFile) {

            throw new UnsupportedOperationException(

                    "ExifInterface only supports saving attributes on JPEG formats.");

        }

        // Keep the thumbnail in memory

        mThumbnailBytes = getThumbnail();