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   1  <?php
   2  
   3  
   4  namespace Fig\Link;
   5  
   6  use Psr\Link\LinkProviderInterface;
   7  use Psr\Link\LinkInterface;
   8  
   9  /**
  10   * Class LinkProviderTrait
  11   *
  12   * @implements LinkProviderInterface
  13   */
  14  trait LinkProviderTrait
  15  {
  16      /**
  17       * An array of the links in this provider.
  18       *
  19       * The keys of the array MUST be the spl_object_hash() of the object being stored.
  20       * That helps to ensure uniqueness.
  21       *
  22       * @var LinkInterface[]
  23       */
  24      private $links = [];
  25  
  26      /**
  27       * {@inheritdoc}
  28       */
  29      public function getLinks()
  30      {
  31          return $this->links;
  32      }
  33  
  34      /**
  35       * {@inheritdoc}
  36       */
  37      public function getLinksByRel($rel)
  38      {
  39          $filter = function (LinkInterface $link) use ($rel) {
  40              return in_array($rel, $link->getRels());
  41          };
  42          return array_filter($this->links, $filter);
  43      }
  44  }