class StorageBase

abstract class StorageBase implements KeyValueStoreInterface {
  
  /**
   * The name of the collection holding key and value pairs.
   *
   * @var string
   */
  protected $collection;
  
  /**
   * {@inheritdoc}
   */
  public function __construct($collection) {
    $this->collection = $collection;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCollectionName() {
    return $this->collection;
  }
  
  /**
   * {@inheritdoc}
   */
  public function get($key, $default = NULL) {
    $values = $this->getMultiple([
      $key,
    ]);
    return $values[$key] ?? $default;
  }
  
  /**
   * {@inheritdoc}
   */
  public function setMultiple(array $data) {
    foreach ($data as $key => $value) {
      $this->set($key, $value);
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function delete($key) {
    $this->deleteMultiple([
      $key,
    ]);
  }

}