LangUtils.java

public static boolean match(@Nullable Pattern pattern, @Nullable String input) {
    if (pattern == null || input == null) {
        return false;
    }
    return pattern.matcher(input).matches();
}

@Nullable
public static String toStr(@Nullable Object value) {
    return (value != null) ? value.toString() : null;
}

public static <T> Stream<T> safeStream(@Nullable T[] array) {
    if (array == null || array.length == 0) {
        return Stream.empty();
    } else {
        return Arrays.stream(array);
    }
}

public static int toInt(Integer value, int fallback) {
    return value != null ? value : fallback;
}

@Nullable
public static <T> T first(@Nullable Collection<T> collection) {
    if (collection == null) {
        return null;
    }
    for (T elem : collection) {
        return elem;
    }
    return null;
}