/**
* Navigate stream feed through link relations
*
* @param StreamFeed $streamFeed The stream feed to navigate through
* @param LinkRelation $relation The "direction" expressed as link relation
* @return null|StreamFeed
*/
public function navigateStreamFeed(StreamFeed $streamFeed, LinkRelation $relation)
{
$url = $streamFeed->getLinkUrl($relation);
if (empty($url)) {
return null;
}
return $this->readStreamFeed($url, $streamFeed->getEntryEmbedMode());
}
/**
* @test
*/
public function get_link_url_returns_null_on_missing_url()
{
$feed = new StreamFeed(['links' => [['relation' => 'first', 'uri' => 'http://sample.uri:12345/stream']]]);
$this->assertNull($feed->getLinkUrl(LinkRelation::LAST()));
}
