/**
* Sets the target topic. Also reads the topic subject and the last post pointer
* from the target object.
*
* @param Topic $topic The target topic.
*
* @return void
*/
public function setTarget(Topic $topic)
{
$this->target = $topic;
$this->lastPost = $topic->getLastPost();
$this->lastPostCrdate = $this->lastPost->getTimestamp();
$this->subject = $topic->getSubject();
}
