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User Guide
The information contained in this section applies to IBM WebSphere Commerce Version 7.0.0.9 and Feautre Pack 8. The documentation also applies to all subsequent releases and modifications until otherwise indicated in new editions.
Developing
The topics in the Developing section describe tasks performed by an application developer.
Customizing WebSphere Commerce
You can extend the WebSphere Commerce product to fit your business needs. This topic describes the prerequisite skills and required knowledge that you need to customize business logic. After you have the required knowledge, use WebSphere Commerce Developer to take tutorials that guide you step-by-step through various customization scenarios.
Calculation framework
Commerce systems need to calculate monetary amounts and apply them to business objects. Business rules and legal requirements specify how and when these monetary amounts should be calculated. When these rules and requirements change, a good commerce system can adapt to the changes with little or no programming changes.
Calculation framework customization
In the WebSphere Commerce calculation framework, all calculation commands use the com.ibm.commerce.order.calculation.Item to access OrderItemAccessBean. To customize calculation commands, use the Item object, a wrapper class of the OrderItemAccessBean, instead of directly using the OrderItemAccessBean.

Calculation framework customization

In the WebSphere Commerce calculation framework, all calculation commands use the com.ibm.commerce.order.calculation.Item to access OrderItemAccessBean. To customize calculation commands, use the Item object, a wrapper class of the OrderItemAccessBean, instead of directly using the OrderItemAccessBean.

To customize calculation commands, for example, if you have shipping charges from an external system, you must set the result back to the original supplied calculation framework. Extend the supplied shipping calculation command and apply the result to the ORDERITEMS database table with the following code:

iItems[i].setShippingTotal(orderItemShippingCharges);
iItems[i}.commit();