/**
* Validates the given prefix.
*/
protected function validatePrefix()
{
if ($this->board->prefixRequired && empty($this->prefix)) {
throw new UserInputException('prefix');
}
$prefixes = $this->board->getPrefixOptions();
if (!empty($this->prefix) && !isset($prefixes[$this->prefix])) {
throw new UserInputException('prefix', 'invalid');
}
}
/**
* Changes the prefix of the selected thread.
*/
public function changePrefix()
{
if (!$this->board->getModeratorPermission('canEditPost')) {
return;
}
$prefixOptions = $this->board->getPrefixOptions();
if (empty($this->prefix) && !$this->board->prefixRequired || isset($prefixOptions[$this->prefix])) {
$this->thread->setPrefix($this->prefix);
if ($this->thread->lastPostTime == $this->board->getLastPostTime()) {
WCF::getCache()->clearResource('boardData', true);
}
}
}