Decorator
Design Pattern
Publish Date:   2019-05-15

Decorator Pattern

Decorator

AddOnDecoractor is-A Beverage
SolidCoffeeCLass is-A Beverage
Decorator is-A AddOnDecoractor
Decorate Has-A SolidCoffeeCLass

This should only be used when the Cost() function is vastly different from each other.

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abstract class Beverage() {
	abstract public function cost();
}

abstract class AddOnDecorator extends Beverage {
	
	abstract public function cost();
}

class Espresso extends Beverage {
	
	public function cost(){
		return 1;
	}
}

class Caramel extends AddOnDecorator {
	
	Beverage $beverage;

	__constructor(Beverage $beverage) {

		this.beverage = $beverage;
	}

	public function cost() {

		return this->beverage->cost() + '0.2';
	}

}


$coffee = new Caramel(new Espresso());
$coffee->cost();
---> 1.2
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