Adapter を PHP で

<?php namespace RefactoringGuru\Adapter\RealWorld; /** * The Target interface represents the interface that your application's classes * already follow. */ interface Notification { public function send(string $title, string $message); } /** * Here's an example of the existing class that follows the Target interface. * * The truth is that many real apps may not have this interface clearly defined. * If you're in that boat, your best bet would be to extend the Adapter from one * of your application's existing classes. If that's awkward (for instance, * SlackNotification doesn't feel like a subclass of EmailNotification), then * extracting an interface should be your first step. */ class EmailNotification implements Notification { private $adminEmail; public function __construct(string $adminEmail) { $this->adminEmail = $adminEmail; } public function send(string $title, string $message): void { mail($this->adminEmail, $title, $message); echo "Sent email with title '$title' to '{$this->adminEmail}' that says '$message'."; } } /** * The Adaptee is some useful class, incompatible with the Target interface. You * can't just go in and change the code of the class to follow the Target * interface, since the code might be provided by a 3rd-party library. */ class SlackApi { private $login; private $apiKey; public function __construct(string $login, string $apiKey) { $this->login = $login; $this->apiKey = $apiKey; } public function logIn(): void { // Send authentication request to Slack web service. echo "Logged in to a slack account '{$this->login}'.\n"; } public function sendMessage(string $chatId, string $message): void { // Send message post request to Slack web service. echo "Posted following message into the '$chatId' chat: '$message'.\n"; } } /** * The Adapter is a class that links the Target interface and the Adaptee class. * In this case, it allows the application to send notifications using Slack * API. */ class SlackNotification implements Notification { private $slack; private $chatId; public function __construct(SlackApi $slack, string $chatId) { $this->slack = $slack; $this->chatId = $chatId; } /** * An Adapter is not only capable of adapting interfaces, but it can also * convert incoming data to the format required by the Adaptee. */ public function send(string $title, string $message): void { $slackMessage = "#" . $title . "# " . strip_tags($message); $this->slack->logIn(); $this->slack->sendMessage($this->chatId, $slackMessage); } } /** * The client code can work with any class that follows the Target interface. */ function clientCode(Notification $notification) { // ... echo $notification->send("Website is down!", "<strong style='color:red;font-size: 50px;'>Alert!</strong> " . "Our website is not responding. Call admins and bring it up!"); // ... } echo "Client code is designed correctly and works with email notifications:\n"; $notification = new EmailNotification("developers@example.com"); clientCode($notification); echo "\n\n"; echo "The same client code can work with other classes via adapter:\n"; $slackApi = new SlackApi("example.com", "XXXXXXXX"); $notification = new SlackNotification($slackApi, "Example.com Developers"); clientCode($notification); 

Client code is designed correctly and works with email notifications: Sent email with title 'Website is down!' to 'developers@example.com' that says '<strong style='color:red;font-size: 50px;'>Alert!</strong> Our website is not responding. Call admins and bring it up!'. The same client code can work with other classes via adapter: Logged in to a slack account 'example.com'. Posted following message into the 'Example.com Developers' chat: '#Website is down!# Alert! Our website is not responding. Call admins and bring it up!'.