[milo-dev] Decoding ArrayDimensions

[Joe San <codeintheopen@xxxxxxxxx>]

I was trying to understand the idea behind the unflatten method for the ArrayDimensions that is implemented in milo! Can you give me a small example for what the recursive method is doing in the ArrayUtil.java class?

It is these two methods what I'm trying to understand!

public static Object unflatten(Object array, int[] dimensions) {
    Class<?> type = getType(array);

    return unflatten(type, array, dimensions, 0);
}

private static Object unflatten(Class<?> type, Object array, int[] dimensions, int offset) {
    if (dimensions.length == 1) {
        Object a = Array.newInstance(type, dimensions[0]);

        for (int i = 0; i < dimensions[0]; i++) {
            Array.set(a, i, Array.get(array, offset + i));
        }

        return a;
    } else {
        Object a = Array.newInstance(type, dimensions);

        int[] tail = Arrays.copyOfRange(dimensions, 1, dimensions.length);

        for (int i = 0; i < dimensions[0]; i++) {
            Object element = unflatten(type, array, tail, offset + i * length(tail));
            Array.set(a, i, element);
        }

        return a;
    }
}