2.1. Adapter / Wrapper

    • DB Client libraries adapter
    • using multiple different webservices and adapters normalize data sothat the outcome is the same for all

    You can also find this code on GitHub

    Book.php

    1. <?php
    2.  
    3. namespace DesignPatterns\Structural\Adapter;
    4.  
    5. class Book implements BookInterface
    6. {
    7.     /**
    8.      * @var int
    9.      */
    10.     private $page;
    11.  
    12.     public function open()
    13.     {
    14.         $this->page = 1;
    15.     }
    16.  
    17.     public function turnPage()
    18.     {
    19.         $this->page++;
    20.  
    21.     public function getPage(): int
    22.     {
    23.         return $this->page;
    24.     }
    25. }

    EBookAdapter.php

    1. <?php
    2.  
    3. namespace DesignPatterns\Structural\Adapter;
    4.  
    5. interface EBookInterface
    6. {
    7.     public function unlock();
    8.  
    9.     public function pressNext();
    10.  
    11.     /**
    12.      * returns current page and total number of pages, like [10, 100] is page 10 of 100
    13.      *
    14.      * @return int[]
    15.      */
    16.     public function getPage(): array;
    17. }

    Kindle.php

    Tests/AdapterTest.php

    1. <?php
    2.  
    3. namespace DesignPatterns\Structural\Adapter\Tests;
    4. use DesignPatterns\Structural\Adapter\Book;
    5. use DesignPatterns\Structural\Adapter\EBookAdapter;
    6. use DesignPatterns\Structural\Adapter\Kindle;
    7. use PHPUnit\Framework\TestCase;
    8.  
    9. class AdapterTest extends TestCase
    10. {
    11.     public function testCanTurnPageOnBook()
    12.     {
    13.         $book = new Book();
    14.         $book->open();
    15.         $book->turnPage();
    16.  
    17.         $this->assertEquals(2, $book->getPage());
    18.     }
    19.  
    20.     public function testCanTurnPageOnKindleLikeInANormalBook()
    21.     {
    22.         $kindle = new Kindle();
    23.         $book = new EBookAdapter($kindle);
    24.  
    25.         $book->open();
    26.         $book->turnPage();
    27.  
    28.         $this->assertEquals(2, $book->getPage());
    29.     }