设计模式——建造者模式

设计模式

发布日期: 2022-06-06

文章字数: 344

阅读时长: 1 分

说明

将一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。首先看下关系图：

示例

下面讲解下设计模式的代码实现

创建产品类

class Product{
    private $parts = [];
    public function add(string $part): void{
        $this->parts[] = $part;
    }
    public function show():void{
        print_r($this->parts);
    }
}

创建建造者接口

interface Builder{
    public function buildPartA(): void;
    public function buildPartB(): void;
    public function getResult(): Product;
}

创建多个建造者实现类

class ConcreteBuilder1 implements Builder{
    private $product;
    public function __construct(){
        $this->product = new Product();
    }

    public function buildPartA(): void{
        $this->product->add('部件A');
    }
    public function buildPartB(): void{
        $this->product->add('部件B');
    }
    public function getResult(): Product{
        return $this->product;
    }
}

class ConcreteBuilder2 implements Builder{
    private $product;
    public function __construct(){
        $this->product = new Product();
    }

    public function buildPartA(): void{
        $this->product->add('部件X');
    }
    public function buildPartB(): void{
        $this->product->add('部件Y');
    }
    public function getResult(): Product{
        return $this->product;
    }
}

创建构造器

class Director{
    public function construct(Builder $builder){
        $builder->buildPartA();
        $builder->buildPartB();
    }
}

我们来测试下：

class FactoryTest{
    public static function index(){
        $director = new Director();
        $builder1 = new ConcreteBuilder1();
        $builder2 = new ConcreteBuilder2();
        
        $director->construct($builder1);
        $product1 = $builder1->getResult();
        $product1->show();
        
        $director->construct($builder2);
        $product2 = $builder2->getResult();
        $product2->show();
    }
}