The state mode (State) code examples of PHP design pattern (29)

purpose

State mode can encapsulate different behaviors based on the same kind of transaction of an object. It provides a concise way for an object to change its behavior at runtime without having to resort to a single large conditional judgment statement.

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Code

  • 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();
    }
}

test

  • 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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Origin blog.csdn.net/weixin_43814458/article/details/108680876