--- /dev/null
+<?php
+
+/**
+ * A class for representing links in JSON Activities
+ *
+ * @category Feed
+ * @package StatusNet
+ * @author Zach Copley <zach@status.net>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ */
+
+class ActivityStreamsLink
+{
+ private $linkDict;
+
+ function __construct($url = null, $rel = null, $mediaType = null)
+ {
+ // links MUST have a URL
+ if (empty($url)) {
+ throw new Exception('Links must have a URL.');
+ }
+
+ $this->linkDict = array(
+ 'url' => $url,
+ 'rel' => $rel, // extension
+ 'type' => $mediaType // extension
+ );
+ }
+
+ function asArray()
+ {
+ return array_filter($this->linkDict);
+ }
+}