Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and Iterative Development, Third Edition

Chapter 25. GRASP: More Objects with Responsibilities

	Luck is the residue of design.
	--Branch Rickey

Objectives

• Learn to apply the remaining GRASP patterns.

Introduction

Previously, we applied five GRASP patterns:

• Information Expert, Creator, High Cohesion, Low Coupling, and Controller

The final four GRASP patterns are covered in this chapter. They are:

• Polymorphism

• Indirection

• Pure Fabrication

• Protected Variations

Once these have been explained, we will have a rich and shared vocabulary with which to discuss designs. And as some of the “Gang-of-Four” (GoF) design patterns (such as Strategy and Abstract Factory) are also introduced in subsequent chapters, ...