Call the method setItemShipGroupQty of ShoppingCart class from a simple method

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Hi to all,

I'm trying to call from a simple method the method  
setItemShipGroupQty() of ShoppingCart but actually it accepts only  
some parameters with native type double and int and so it gives to me  
an error from the simple method.

I have tried to add this method and now everything is ok.

public void setItemShipGroupQty(ShoppingCartItem item, Double  
quantity, Integer idx) {
    this.setItemShipGroupQty(item, this.getItemIndex(item),  
quantity.doubleValue(), idx.intValue());
}

Is it ok if I add this method or did you have a different idea to  
solve this problem ?

Thanks in advance
Marco