php构建型模式(Builder pattern)

练代码，增加了调用时的输出。

<?php
/*
The builder pattern separates the construction of a complex object from its
representation, making it possible for the same construction process to create
different representations. While some creational patterns construct a product
in one call, builder pattern does it step by step under the control of the director.
*/
 
class Car {
    private $wheels;
    private $color;
 
    public function getWheels() {
        echo 'Car_getWheels<br/>';
        return $this->wheels;
    }
 
    public function setWheels($weels) {
        echo 'Car_setWheels<br/>';
        $this->wheels = $weels;
    }
 
    public function getColor() {
        echo 'Car_getColor<br/>';
        return $this->color;
    }
 
    public function setColor($color) {
        echo 'Car_setColor<br/>';
        $this->color = $color;
    }
 
    public function __toString() {
        return  'Color: ' . $this->color . '. Wheels: ' . $this->wheels;
    }
 
}
 
interface CarBuilderInterface {
    public function setColor($color);
    public function setWheels($wheels);
    public function getResult();
}
 
class CarBuilder implements CarBuilderInterface {
    private $car;
 
    public function __construct() {
        echo 'CarBuilder__construct<br/>';
        $this->car = new Car();
    }
 
    public function setColor($color){
        echo 'CarBuilder_setColor<br/>';
        $this->car->setColor($color);
        return $this;
    }
    public function setWheels($wheels){
        echo 'CarBuilder_setWheels<br/>';
        $this->car->setWheels($wheels);
        return $this;
    }
    public function getResult(){
        echo 'CarBuilder_getResult<br/>';
        return $this->car;
    }
}
 
class CarBuilderDirector {
    private $builder;
 
    public function __construct(CarBuilder $builder) {
        echo 'CarBuilderDirector__construct<br/>';
        $this->builder = $builder;
    }
 
    public function build() {
        echo 'CarBuilderDirector__build<br/>';
        $this->builder->setColor('Red');
        $this->builder->setWheels(4);
        return $this;
    }
 
    public function getCar() {
        echo 'CarBuilderDirector__getCar<br/>';
        return $this->builder->getResult();
    }
}
 
$carBuilder = new CarBuilder();
$carBuilderDirector = new CarBuilderDirector($carBuilder);
$car = $carBuilderDirector->build()->getCar();
echo $car;
 
?>

输出

CarBuilder__construct
CarBuilderDirector__construct
CarBuilderDirector__build
CarBuilder_setColor
Car_setColor
CarBuilder_setWheels
Car_setWheels
CarBuilderDirector__getCar
CarBuilder_getResult
Color: Red. Wheels: 4