/**
  * Esta função se encarga de tranformar um objeto json, á um objeto Livro
  * @return um novo objeto livro
  */
 function getBooksFromResult($result)
 {
     $books = array();
     $values_ = $result;
     foreach ($values_ as $value) {
         $book = new Livro();
         $book->setTitulo($value['volumeInfo']['title']);
         $authors = $value['volumeInfo']['authors'];
         echo var_dump($value);
         if (count($authors) > 0) {
             foreach ($authors as $author) {
                 $book->addAutor($author);
             }
         }
         $book->setId($value['id']);
         $book->setPaginas($value['volumeInfo']['pageCount']);
         $book->setEditora($value['volumeInfo']['publisher']);
         $book->setLinkPrevio($value['volumeInfo']['previewLink']);
         $book->setDatapublica($value['volumeInfo']['publishedDate']);
         $book->setDescripcion($value['volumeInfo']['description']);
         if (isset($value['volumeInfo']['industryIdentifiers'])) {
             $book->setIsbn($value['volumeInfo']['industryIdentifiers'][0]['identifier']);
         }
         $book->setImageLink($value['volumeInfo']['imageLinks']['thumbnail']);
         array_push($books, $book);
     }
     return $books;
 }