目的
構建一個清晰的業務規則規范，其中每條規則都能被針對性地檢查，每個規范類中都有一個稱為isSatisfiedBy的方法，方法判斷給定的規則是否滿足規范從而回傳 true 或 false，
- RulerZ
UML圖
★官方PHP高級學習交流社群「點擊」管理整理了一些資料，BAT等一線大廠進階知識體系備好（相關學習資料以及筆面試題）以及不限于：分布式架構、高可擴展、高性能、高并發、服務器性能調優、TP6，laravel，YII2，Redis，Swoole、Swoft、Kafka、Mysql優化、shell腳本、Docker、微服務、Nginx等多個知識點高級進階干貨
代碼
- Item.php
<?php
namespace DesignPatterns\Behavioral\Specification;
class Item
{
/**
* @var float
*/
private $price;
public function __construct(float $price)
{
$this->price = $price;
}
public function getPrice(): float
{
return $this->price;
}
}
- SpecificationInterface.php
<?php
namespace DesignPatterns\Behavioral\Specification;
interface SpecificationInterface
{
public function isSatisfiedBy(Item $item): bool;
}
- OrSpecification.php
<?php
namespace DesignPatterns\Behavioral\Specification;
class OrSpecification implements SpecificationInterface
{
/**
* @var SpecificationInterface[]
*/
private $specifications;
/**
* @param SpecificationInterface[] ...$specifications
*/
public function __construct(SpecificationInterface ...$specifications)
{
$this->specifications = $specifications;
}
/**
* 如果有一條規則符合條件，回傳 true，否則回傳 false
*/
public function isSatisfiedBy(Item $item): bool
{
foreach ($this->specifications as $specification) {
if ($specification->isSatisfiedBy($item)) {
return true;
}
}
return false;
}
}
- PriceSpecification.php
<?php
namespace DesignPatterns\Behavioral\Specification;
class PriceSpecification implements SpecificationInterface
{
/**
* @var float|null
*/
private $maxPrice;
/**
* @var float|null
*/
private $minPrice;
/**
* @param float $minPrice
* @param float $maxPrice
*/
public function __construct($minPrice, $maxPrice)
{
$this->minPrice = $minPrice;
$this->maxPrice = $maxPrice;
}
public function isSatisfiedBy(Item $item): bool
{
if ($this->maxPrice !== null && $item->getPrice() > $this->maxPrice) {
return false;
}
if ($this->minPrice !== null && $item->getPrice() < $this->minPrice) {
return false;
}
return true;
}
}
- AndSpecification.php
<?php
namespace DesignPatterns\Behavioral\Specification;
class AndSpecification implements SpecificationInterface
{
/**
* @var SpecificationInterface[]
*/
private $specifications;
/**
* @param SpecificationInterface[] ...$specifications
*/
public function __construct(SpecificationInterface ...$specifications)
{
$this->specifications = $specifications;
}
/**
* 如果有一條規則不符合條件，回傳 false，否則回傳 true
*/
public function isSatisfiedBy(Item $item): bool
{
foreach ($this->specifications as $specification) {
if (!$specification->isSatisfiedBy($item)) {
return false;
}
}
return true;
}
}
- NotSpecification.php
<?php
namespace DesignPatterns\Behavioral\Specification;
class NotSpecification implements SpecificationInterface
{
/**
* @var SpecificationInterface
*/
private $specification;
public function __construct(SpecificationInterface $specification)
{
$this->specification = $specification;
}
public function isSatisfiedBy(Item $item): bool
{
return !$this->specification->isSatisfiedBy($item);
}
}
測驗
- Tests/SpecificationTest.php
<?php
namespace DesignPatterns\Behavioral\Specification\Tests;
use DesignPatterns\Behavioral\Specification\Item;
use DesignPatterns\Behavioral\Specification\NotSpecification;
use DesignPatterns\Behavioral\Specification\OrSpecification;
use DesignPatterns\Behavioral\Specification\AndSpecification;
use DesignPatterns\Behavioral\Specification\PriceSpecification;
use PHPUnit\Framework\TestCase;
class SpecificationTest extends TestCase
{
public function testCanOr()
{
$spec1 = new PriceSpecification(50, 99);
$spec2 = new PriceSpecification(101, 200);
$orSpec = new OrSpecification($spec1, $spec2);
$this->assertFalse($orSpec->isSatisfiedBy(new Item(100)));
$this->assertTrue($orSpec->isSatisfiedBy(new Item(51)));
$this->assertTrue($orSpec->isSatisfiedBy(new Item(150)));
}
public function testCanAnd()
{
$spec1 = new PriceSpecification(50, 100);
$spec2 = new PriceSpecification(80, 200);
$andSpec = new AndSpecification($spec1, $spec2);
$this->assertFalse($andSpec->isSatisfiedBy(new Item(150)));
$this->assertFalse($andSpec->isSatisfiedBy(new Item(1)));
$this->assertFalse($andSpec->isSatisfiedBy(new Item(51)));
$this->assertTrue($andSpec->isSatisfiedBy(new Item(100)));
}
public function testCanNot()
{
$spec1 = new PriceSpecification(50, 100);
$notSpec = new NotSpecification($spec1);
$this->assertTrue($notSpec->isSatisfiedBy(new Item(150)));
$this->assertFalse($notSpec->isSatisfiedBy(new Item(50)));
}
}
PHP 互聯網架構師成長之路*「設計模式」終極指南
PHP 互聯網架構師 50K 成長指南+行業問題解決總綱（持續更新）
面試10家公司，識訓9個offer，2020年PHP 面試問題
★如果喜歡我的文章，想與更多資深開發者一起交流學習的話，獲取更多大廠面試相關技術咨詢和指導，歡迎加入我們的群啊，暗號：phpzh（君羊號碼856460874），
2020年最新PHP進階教程，全系列！
內容不錯的話希望大家支持鼓勵下點個贊/喜歡，歡迎一起來交流；另外如果有什么問題 建議 想看的內容可以在評論提出
轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/82450.html
標籤：PHP