Original file
=============
public Product getProduct(Node node) {
    // --- bunch of logic here ---
    if (nodeName.equals("ItemNum")) {
        product.setItemNumber(
            new Integer(StringUtils.parseInt(nodeValue, 0)));
    }
    if (nodeName.equals("AvgPrice")) {
        product.setAveragePrice(
            new Double(StringUtils.parseDouble(nodeValue, 0.0)));
    }
}

Converted file
==============
public Product getProduct(Node node) {
    // --- bunch of logic here ---
    if (msg.isSetField(ItemNum.FIELD)) {
        product.setItemNumber(msg.getInt(ItemNum.FIELD));
    }
    if (msg.isSetField(AvgPrice.FIELD)) {
        product.setAveragePrice(msg.getDouble(AvgPrice.FIELD));
    }
}