/**
* Set key pattern
*
* @param null|string $keyPattern
* @throws Exception\InvalidArgumentException
* @return AdapterOptions
*/
public function setKeyPattern($keyPattern)
{
$keyPattern = (string) $keyPattern;
if ($this->keyPattern !== $keyPattern) {
// validate pattern
if ($keyPattern !== '') {
ErrorHandler::start(E_WARNING);
$result = preg_match($keyPattern, '');
$error = ErrorHandler::stop();
if ($result === false) {
throw new Exception\InvalidArgumentException(sprintf('Invalid pattern "%s"%s', $keyPattern, $error ? ': ' . $error->getMessage() : ''), 0, $error);
}
}
$this->keyPattern = $keyPattern;
}
return $this;
}
/**
* Unlink a file
*
* @param string $file
* @return void
* @throws Exception\RuntimeException
*/
protected function unlink($file)
{
ErrorHandler::start();
$res = unlink($file);
$err = ErrorHandler::stop();
// only throw exception if file still exists after deleting
if (!$res && file_exists($file)) {
throw new Exception\RuntimeException("Error unlinking file '{$file}'; file still exists", 0, $err);
}
}