PHP7 Adapter

Structural/Adapter/Kindle.php

@@ -3,21 +3,37 @@
 namespace DesignPatterns\Structural\Adapter;
 
 /**
- * Kindle is a concrete electronic book.
+ * this is the adapted class. In production code, this could be a class from another package, some vendor code.
+ * Notice that it uses another naming scheme and the implementation does something similar but in another way
  */
 class Kindle implements EBookInterface
 {
     /**
-     * {@inheritdoc}
+     * @var int
      */
+    private $page = 1;
+
+    /**
+     * @var int
+     */
+    private $totalPages = 100;
+
     public function pressNext()
+    {
+        $this->page++;
+    }
+
+    public function unlock()
     {
     }
 
     /**
-     * {@inheritdoc}
+     * returns current page and total number of pages, like [10, 100] is page 10 of 100
+     *
+     * @return int[]
      */
-    public function pressStart()
+    public function getPage(): array
     {
+        return [$this->page, $this->totalPages];
     }
 }