PHP \DesignPatterns\Structural\Adapter\Book \DesignPatterns\Structural\Adapter\EBookAdapter \DesignPatterns\Structural\Adapter\Book \DesignPatterns\Structural\Adapter\Kindle \DesignPatterns\Structural\Adapter\EBookInterface \DesignPatterns\Structural\Adapter\PaperBookInterface Fields Constants Constructors Methods private