PHP设计模式之状态模式（State）代码实例大全（29）

布满荆棘的人生 2022-12-08 13:00 205阅读 0赞

## 目的 ##

状态模式可以基于一个对象的同种事务而封装出不同的行为。它提供一种简洁的方式使得对象在运行时可以改变自身行为，而不必借助单一庞大的条件判断语句。

## UML图 ##

![20200919144419223.png][]

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## 代码 ##

*  ContextOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    class ContextOrder extends StateOrder
    {
        public function getState():StateOrder
        {
            return static::$state;
        }
    
        public function setState(StateOrder $state)
        {
            static::$state = $state;
        }
    
        public function done()
        {
            static::$state->done();
        }
    
        public function getStatus(): string
        {
            return static::$state->getStatus();
        }
    }

*  StateOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    abstract class StateOrder
    {
        /**
         * @var array
         */
        private $details;
    
        /**
         * @var StateOrder $state
         */
        protected static $state;
    
        /**
         * @return mixed
         */
        abstract protected function done();
    
        protected function setStatus(string $status)
        {
            $this->details['status'] = $status;
            $this->details['updatedTime'] = time();
        }
    
        protected function getStatus(): string
        {
            return $this->details['status'];
        }
    }

*  ShippingOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    class ShippingOrder extends StateOrder
    {
        public function __construct()
        {
            $this->setStatus('shipping');
        }
    
        protected function done()
        {
            $this->setStatus('completed');
        }
    }

*  CreateOrder.php

<?php
    
    namespace DesignPatterns\Behavioral\State;
    
    class CreateOrder extends StateOrder
    {
        public function __construct()
        {
            $this->setStatus('created');
        }
    
        protected function done()
        {
            static::$state = new ShippingOrder();
        }
    }

## 测试 ##

*  Tests/StateTest.php

<?php
    
    namespace DesignPatterns\Behavioral\State\Tests;
    
    use DesignPatterns\Behavioral\State\ContextOrder;
    use DesignPatterns\Behavioral\State\CreateOrder;
    use DesignPatterns\Behavioral\State\ShippingOrder;
    use PHPUnit\Framework\TestCase;
    
    class StateTest extends TestCase
    {
        public function testCanShipCreatedOrder()
        {
            $order = new CreateOrder();
            $contextOrder = new ContextOrder();
            $contextOrder->setState($order);
            $contextOrder->done();
    
            $this->assertEquals('shipping', $contextOrder->getStatus());
        }
    
        public function testCanCompleteShippedOrder()
        {
            $order = new ShippingOrder();
            $contextOrder = new ContextOrder();
            $contextOrder->setState($order);
            $contextOrder->done();
    
            $this->assertEquals('completed', $contextOrder->getStatus());
        }
    }

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