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PHPMaster.com:
Overriding Strategy Logic - The Template Method Pattern
September 25, 2012 @ 08:58:01

On PHPMaster.com there's a new tutorial posted talking about the Template Method Pattern to help make some sense (and make easier to use) your implementation of the Strategy pattern.

This bring us back to the question whether it's feasible to eliminate duplicated strategy logic via Inheritance rather than switching over to plain Composition. Indeed it is, and the clean up process can be conducted through an ubiquitous pattern known as Template Method. [...] Simply put, there's a base class (usually an abstract one), which declares a concrete method (a.k.a. the template) responsible for outlining the steps or hooks of a certain algorithm. Most of the time the base type provides boilerplate implementation for some of those steps and the remaining ones are delegated to subclasses.

The subtypes then override the base's functionality and extend it with their own. They show an example of this by making a jQuery image slider (using this plugin) , an "AbstractCycleSlider" class and two subclasses for two other types - "FadeSlider" and "ScrollSlider", each outputting their own HTML. It also shows how to implement a slider using a different plugin and output both in the same script.

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