+ /**
+ * Get the attachment's thumbnail record, if any.
+ *
+ * @return File_thumbnail
+ */
+ function getThumbnail()
+ {
+ return File_thumbnail::staticGet('file_id', $this->id);
+ }
+
+ /**
+ * Blow the cache of notices that link to this URL
+ *
+ * @param boolean $last Whether to blow the "last" cache too
+ *
+ * @return void
+ */
+
+ function blowCache($last=false)
+ {
+ self::blow('file:notice-ids:%s', $this->url);
+ if ($last) {
+ self::blow('file:notice-ids:%s;last', $this->url);
+ }
+ self::blow('file:notice-count:%d', $this->id);
+ }
+
+ /**
+ * Stream of notices linking to this URL
+ *
+ * @param integer $offset Offset to show; default is 0
+ * @param integer $limit Limit of notices to show
+ * @param integer $since_id Since this notice
+ * @param integer $max_id Before this notice
+ *
+ * @return array ids of notices that link to this file
+ */
+
+ function stream($offset=0, $limit=NOTICES_PER_PAGE, $since_id=0, $max_id=0)
+ {
+ $stream = new FileNoticeStream($this);
+ return $stream->getNotices($offset, $limit, $since_id, $max_id);
+ }
+
+ function noticeCount()
+ {
+ $cacheKey = sprintf('file:notice-count:%d', $this->id);
+
+ $count = self::cacheGet($cacheKey);
+
+ if ($count === false) {
+
+ $f2p = new File_to_post();
+
+ $f2p->file_id = $this->id;
+
+ $count = $f2p->count();
+
+ self::cacheSet($cacheKey, $count);
+ }
+
+ return $count;
+ }
+}