Hook: Define MoneyBag Filter

Requirement

Only selected items of a MoneyBag shall be visible to a part of an application.

Filters are most often used in connection with displaying the contents of MoneyBags. E.g., if you want the user to select items from a MoneyBag of available items, but want to keep a safety margin, you can use a filtered MoneyBag for the source Stock.

Method of Adaptation

Enable Feature

Level of Support

Parameter Pattern

HotSpot

Filters

Participants

MoneyBagFilter, NewFilter , MoneyBag, originalMoneyBag , filteredMoneyBag

Changes

1. subclass NewFilter of MoneyBagFilter.
2. NewFilter.countItems implements MoneyBag.countItems .
3. instance originalMoneyBag of MoneyBag.
4. instance filteredMoneyBag of NewFilter with parameter originalMoneyBag.