public function processUnregistration() { $dom = $this->xmlDom; $headerNode = $dom->getElementsByTagName('SIF_Header')->item(0); $originalMsgId = $headerNode->getElementsByTagName('SIF_MsgId')->item(0)->nodeValue; $originalSourceId = $headerNode->getElementsByTagName('SIF_SourceId')->item(0)->nodeValue; $originalTimestamp = $headerNode->getElementsByTagName('SIF_Timestamp')->item(0)->nodeValue; $validSourceId = Agent::checkSourceId($originalSourceId); if (!$validSourceId) { RegisterError::invalidSourceId($agent->sourceId, $originalMsgId); } else { $agent = new Agent($originalSourceId); if ($agent->isRegistered()) { if ($agent->unRegister()) { XmlHelper::buildSuccessMessage(Utility::createMessageId(), Utility::createTimestamp(), $agent->sourceId, $originalMsgId, 0); } else { RegisterError::genericError($agent->sourceId, $originalMsgId); } } else { RegisterError::notRegisteredError($originalSourceId, $originalMsgId); } } }