public static int[] validate4NonNegative(int[] data, String paramName){
        validateNonNegative(data, paramName);
        return validate4(data, paramName);
    }
public static int [ ] validate4NonNegative ( int [ ] data , String paramName ) { validateNonNegative ( data , paramName ) ; return validate4 ( data , paramName ) ; }
Reformats the input array to a length 4 array and checks that all values >= 0.

If the array is length 1, returns [a, a, a, a]
If the array is length 2, return [a, a, b, b]
If the array is length 4, returns the array.

@param data An array
@param paramName The param name, for error reporting
@return An int array of length 4 that represents the input