private final MyValueWrapper myValueWrapper = new MyValueWrapper();

public CharSequence myValueWrapper() {
    return myValueWrapper;
}

private class MyValueWrapper implements CharSequence {
    public int length() {
        int len;
        for (len = 0; charAt(len) != 0; len++);
        return len;
    }

    public char charAt(int index) {
        final int pos = this.offset + <offset> + index;
        return (char) buffer.getByte(pos);
    }
}