/**
* Tries to build a new Message.
* @param string $xmlString to build Message
* @return Message if $xmlString was valid, throws Exception otherwise
*/
public static function createFromXml($xmlString)
{
$doc = @DOMDocument::loadXML($xmlString);
if ($doc == null) {
throw new Exception('Unvalid XML string.');
}
/*
* Validating every message agains a definition in the web is wasting
* time. So let's validate against a local schema.
if (!$doc->validate()) {
throw new Exception('Unvalid XML.');
}
*/
/*
* The validation makes a lot of checks for us. We don't have to look
* for '<' and '>' characters.
*/
if (!$doc->schemaValidate('uBookMessage.xsd')) {
throw new Exception('Unvalid uBookMessage.');
}
$elem = $doc->documentElement;
$from = $elem->getAttribute('from');
$message = new self($from);
$message->parseBookList($elem);
$message->parseServerList($elem);
return $message;
}
