private function AddSchemaSingleton(Php\Writer $writer, $schemaClass)
{
$writer->StartDocComment();
$writer->AddDocComment($schemaClass, 'var');
$writer->EndDocComment();
$writer->AddCommand('private static $singleton');
$writer->StartDocComment();
$writer->AddDocComment('Get unique ' . $schemaClass . '.');
$writer->AddDocComment($schemaClass, 'return');
$writer->EndDocComment();
$writer->StartFunction('static function Singleton');
$writer->Start_If('self::$singleton === null');
$writer->AddCommand('self::$singleton = new self()');
$writer->End_If();
$writer->AddCommand('return self::$singleton');
$writer->EndFunction();
}
