protected boolean canActAs(SignetSubject actingAs, Subsystem subsystem)
public boolean canActAs(SignetSubject actingAs, Subsystem subsystem)
	protected boolean canActAs(SignetSubject actingAs, Subsystem subsystem)	{		// Everyone can act as nobody else, i.e. self		if (null == actingAs)			return true;		Set proxies;		proxies = Common.filterProxies(getProxiesReceived(), Status.ACTIVE);		proxies = Common.filterProxies(proxies, subsystem);		proxies = Common.filterProxiesByGrantor(proxies, actingAs);		return (proxies.size() > 0);	}