1.7. 简单工厂

1.7.1. 目的

简单的创建对象型工厂模式

It differs from the static factory because it is not static. Therefore, you can have multiple factories, differently parameterized, you can subclass it and you can mock it. It always should be preferred over a static factory!

1.7.2. UML 图

Alt SimpleFactory UML Diagram

1.7.3. 代码

你可以在 GitHub 上找到这些代码

SimpleFactory.php

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<?php declare(strict_types=1);

namespace DesignPatterns\Creational\SimpleFactory;

class SimpleFactory
{
    public function createBicycle(): Bicycle
    {
        return new Bicycle();
    }
}

Bicycle.php

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<?php declare(strict_types=1);

namespace DesignPatterns\Creational\SimpleFactory;

class Bicycle
{
    public function driveTo(string $destination)
    {
    }
}

1.7.4. Usage

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 $factory = new SimpleFactory();
 $bicycle = $factory->createBicycle();
 $bicycle->driveTo('Paris');

1.7.5. 测试

Tests/SimpleFactoryTest.php

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<?php declare(strict_types=1);

namespace DesignPatterns\Creational\SimpleFactory\Tests;

use DesignPatterns\Creational\SimpleFactory\Bicycle;
use DesignPatterns\Creational\SimpleFactory\SimpleFactory;
use PHPUnit\Framework\TestCase;

class SimpleFactoryTest extends TestCase
{
    public function testCanCreateBicycle()
    {
        $bicycle = (new SimpleFactory())->createBicycle();
        $this->assertInstanceOf(Bicycle::class, $bicycle);
    }
}