kanel/specification

An implementation of the Specification design pattern

, _(*1)

Specification design pattern

Implementation of the "Specification" design pattern., _(*2)

The Goal of this pattern is to have separate classes of logic in order to do condition composition without rewriting and maintaining the conditions at different places., _(*3)

How to

All the classes should extend Kanel/Specification (abstract class), _(*4)

$isAvailable = new isProductAvailable(); 
$isShippable = new isProductShippable();
$isOnSale = new isProductOnSale();

Then perform a composition of specification, _(*5)

$specification = $isAvailable->and($isOnSale)->xor($isShippable);

if ($specification->isSatisfiedBy($product)) {

}

Available operators :

• and
• or
• xor
• not

If you look for another implementation of the specification design pattern look at kanel/specifications2, _(*6)