private function add_query(puzzle_message_RequestInterface $request, $value)
{
if ($value instanceof puzzle_Query) {
$original = $request->getQuery();
// Do not overwrite existing query string variables by overwriting
// the object with the query string data passed in the URL
$request->setQuery($value->overwriteWith($original->toArray()));
} elseif (is_array($value)) {
// Do not overwrite existing query string variables
$query = $request->getQuery();
foreach ($value as $k => $v) {
if (!isset($query[$k])) {
$query[$k] = $v;
}
}
} else {
throw new InvalidArgumentException('query value must be an array ' . 'or puzzle_Query object');
}
}
