assert systemId != null;
if ( systemId == null ) return null;
	public URL findResource( ModuleHandle moduleHandle, String fileName,			int type )	{		assert moduleHandle != null;		if ( fileName == null )			return null;		URL systemId = moduleHandle.getModule( ).getSystemId( );		assert systemId != null;		URL url = tryFileSearch( systemId, fileName );		if ( url != null )			return url;		// if system id indicates a file protocol, it must have been checked		// in the tryFileSearch(). DO NOT call tryURISearch in these cases.		if ( systemId == null				|| URIUtil.FILE_SCHEMA						.equalsIgnoreCase( systemId.getProtocol( ) ) )			return null;		return tryURLSearch( systemId, fileName );	}