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<?php


namespace Fig\Link;

use Psr\Link\LinkProviderInterface;
use Psr\Link\LinkInterface;

/**
 * Class LinkProviderTrait
 *
 * @implements LinkProviderInterface
 */
trait LinkProviderTrait
{
    /**
     * An array of the links in this provider.
     *
     * The keys of the array MUST be the spl_object_hash() of the object
being stored.
     * That helps to ensure uniqueness.
     *
     * @var LinkInterface[]
     */
    private array $links = [];

    /**
     * {@inheritdoc}
     */
    public function getLinks(): iterable
    {
        return $this->links;
    }

    /**
     * {@inheritdoc}
     */
    public function getLinksByRel($rel): iterable
    {
        return array_filter($this->links, fn(LinkInterface $link) =>
in_array($rel, $link->getRels()));
    }
}