Layer Supertype

A type that acts as the supertype for all type in its layer.

• Overview
• How It Works
• When to Use It

Overview

It’s not uncommon for all the objects in a layer to have methods you don’t want to have duplicated throughout the system. You can move all of this behavior into a common Layer Supertype.

How It Works

All you need is a super class for all the objects in a layer. If you have more than one kind of object in a layer, it’s useful to have more than one Layer Supertype.

For example, a Domain Object super class for all the domain objects in a Domain Model. Common features, such as the storage and handling of Identity Fields, can go there. Similarly all Data Mappers in the mapping layer can have a super class that relies on the fact that all domain objects have a common super class.

When to Use It

Use Layer Supertype when you have a common features from all objects in a layer.