Hook: Define StockItem

Requirement

A new type of StockItem is needed to represent items contained in some StoringStock.

Method of Adaptation

Add Feature

Level of Support

Open Ended

HotSpot

Data management

Participants

StockItemImpl, NewStockItem

Changes

1. subclass NewStockItem of StockItemImpl.
2. NewStockItem.clone overrides StockItemImpl.clone .
3. if the natural order is not the order of the names:
1. NewStockItem.compareTo overrides StockItemImpl.compareTo .
4. if two NewStockItems can be equal although they are not identical:
1. NewStockItem.equals overrides StockItemImpl.equals .
5. add new attributes as necessary.
6. add new methods as necessary.

Constraints

• This hook describes only the changes necessary if you use the Pure Java implementation of the data management classes.

Comments

• Usually you will need a new type of StockItem for every type of StoringStock that your application uses. The new type is needed so that any information relevant to this class of objects can be stored appropriately and efficiently.