#MOC
## 例
- コーヒーショップの注文システム
- コーヒーにいくつかの追加オプション（例えば、ミルク、シュガー、ホイップクリームなど）がある
- 追加オプションは、コーヒーのコストに影響を及ぼす
```mermaid
classDiagram
Coffee <|.. SimpleCoffee
Coffee <|.. MilkCoffee
Coffee <|.. WhipCoffee
MilkCoffee o-- Coffee
WhipCoffee o-- Coffee
class Coffee{
+getCost()(abstract)
+getDescription()(abstract)
}
class SimpleCoffee{
+getCost()
+getDescription()
}
class MilkCoffee{
-coffee
+getCost()
+getDescription()
}
class WhipCoffee{
-coffee
+getCost()
+getDescription()
}
```
```php
interface Coffee
{
public function getCost();
public function getDescription();
}
class SimpleCoffee implements Coffee
{
public function getCost()
{
return 10;
}
public function getDescription()
{
return 'Simple coffee';
}
}
class MilkCoffee implements Coffee
{
protected $coffee;
public function __construct(Coffee $coffee)
{
$this->coffee = $coffee;
}
public function getCost()
{
return $this->coffee->getCost() + 2;
}
public function getDescription()
{
return $this->coffee->getDescription() . ', milk';
}
}
class WhipCoffee implements Coffee
{
protected $coffee;
public function __construct(Coffee $coffee)
{
$this->coffee = $coffee;
}
public function getCost()
{
return $this->coffee->getCost() + 5;
}
public function getDescription()
{
return $this->coffee->getDescription() . ', whip';
}
}
// Client code
$someCoffee = new SimpleCoffee();
echo $someCoffee->getCost(); // output: 10
echo $someCoffee->getDescription(); // output: Simple coffee
$someCoffee = new MilkCoffee($someCoffee);
echo $someCoffee->getCost(); // output: 12
echo $someCoffee->getDescription(); // output: Simple coffee, milk
$someCoffee = new WhipCoffee($someCoffee);
echo $someCoffee->getCost(); // output: 17
echo $someCoffee->getDescription(); // output: Simple coffee, milk, whip
```
## 📚ドキュメント
- [12. Decorator パターン | TECHSCORE(テックスコア)](https://www.techscore.com/tech/DesignPattern/Decorator)
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