2.2. Most (Bridge)
2.2.1. Przeznaczenie
Pozwala oddzielić abstrakcję obiektu od jego implementacji.
2.2.2. Diagram UML
2.2.3. Kod
Ten kod znajdziesz również na GitHub.
Formatter.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge;
6
7interface Formatter
8{
9 public function format(string $text): string;
10}
PlainTextFormatter.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge;
6
7class PlainTextFormatter implements Formatter
8{
9 public function format(string $text): string
10 {
11 return $text;
12 }
13}
HtmlFormatter.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge;
6
7class HtmlFormatter implements Formatter
8{
9 public function format(string $text): string
10 {
11 return sprintf('<p>%s</p>', $text);
12 }
13}
Service.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge;
6
7abstract class Service
8{
9 public function __construct(protected Formatter $implementation)
10 {
11 }
12
13 final public function setImplementation(Formatter $printer)
14 {
15 $this->implementation = $printer;
16 }
17
18 abstract public function get(): string;
19}
HelloWorldService.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge;
6
7class HelloWorldService extends Service
8{
9 public function get(): string
10 {
11 return $this->implementation->format('Hello World');
12 }
13}
PingService.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge;
6
7class PingService extends Service
8{
9 public function get(): string
10 {
11 return $this->implementation->format('pong');
12 }
13}
2.2.4. Testy
Tests/BridgeTest.php
1<?php
2
3declare(strict_types=1);
4
5namespace DesignPatterns\Structural\Bridge\Tests;
6
7use DesignPatterns\Structural\Bridge\HelloWorldService;
8use DesignPatterns\Structural\Bridge\HtmlFormatter;
9use DesignPatterns\Structural\Bridge\PlainTextFormatter;
10use PHPUnit\Framework\TestCase;
11
12class BridgeTest extends TestCase
13{
14 public function testCanPrintUsingThePlainTextFormatter()
15 {
16 $service = new HelloWorldService(new PlainTextFormatter());
17
18 $this->assertSame('Hello World', $service->get());
19 }
20
21 public function testCanPrintUsingTheHtmlFormatter()
22 {
23 $service = new HelloWorldService(new HtmlFormatter());
24
25 $this->assertSame('<p>Hello World</p>', $service->get());
26 }
27}