Strategy

Terminology:

• Context
• Strategy
• Concrete Strategy

Purpose

To separate strategies and to enable fast switching between them. Also this pattern is a good alternative to inheritance (instead of having an abstract class that is extended).

Examples

• sorting a list of objects, one strategy by date, the other by id
• simplify unit testing: e.g. switching between file and in-memory storage

UML Diagram

Code

You can also find this code on GitHub

Context.php

Context.php

Comparator.php

Comparator.php

DateComparator.php

DateComparator.php

IdComparator.php

IdComparator.php

Test

Tests/StrategyTest.php

Tests/StrategyTest.php