Mapping attributes using extender mapping

You can use extender mapping to map an attribute assignment to a function.

To map an attribute to a function using extender mapping:

1. In the Outline view, click the class containing the attribute that you want to map to a function.
2. In the BOM Editor, in the BOM to XOM Mapping section, specify the name of the extender class in the Extender name field.
3. Define the attribute as a Java™ static method named set followed by the name of the attribute.

   When the attribute is static, the extender method takes the execution class corresponding to the attribute type as parameter. In the case of an instance attribute, the extender method takes two parameters: the execution class type, and the execution class corresponding to the attribute type.

4. Save the BOM.

public class CartExtender {  
  public static void setAverageItemPrice(ShoppingCart cart, double v) {
    cart.setValue(cart.getNumberOfItems()*v);
  }
}