Determine if Carrots and Tatters are grown

I'm trying to determine if crops including carrots and potatoes have fully grown. Following code works but not for carrots and potatoes.

Code:java

@EventHandler(ignoreCancelled = true, priority = EventPriority.LOWEST)
    public void onBlockGrow(BlockGrowEvent event)
    {
        MaterialData newDataValue = event.getNewState().getData();
        if (newDataValue instanceof Crops)
            if (((Crops) newDataValue).getState() == CropState.RIPE) //this line is never reached for carrots or potatoes
            {
                //Do something
            }
    }

For carrots and potatoes it seems like the MaterialData returned for the new state is just that MaterialData and not Crops. For Wheat Crops is returned which is a sublass of MaterialData and has all the Data in nice enums. Is this a bug or am I missing something?

Of course I could do the quick hackerino and just compare the datavalues. But with the upcoming update I would prefer not having hardcoded ids and datavalues floating around in my code.

 

Diemex right now hackerino seems to be the only method