import javaimport jacommafrom jacomma.icm.type import Symbolfrom jacomma.platform.core import Agent, AgentManager, \	 MessagePattern, AgentObserver, AgentObserverAdapter# The Message Handler classclass expander( Agent.MessageHandler ):	def onMessage( self, agent, msg ):		ptrn = msg.getContent().get( 1 )		hdlr = msg.getContent().get( 2 )		agent.registerHandler( ptrn, hdlr )		print agent, ": Registered Dynamic Handler"# The pattern test objectclass test( java.lang.Object ) :	def equals( self, msg ) :		l = msg.getContent()		return java.util.List.isInstance( l ) \			   and l.size() == 3 \			   and l.get( 0 ).equals( Symbol( "add-handler" ) ) \			   and MessagePattern.isInstance( l.get( 1 ) ) \			   and Agent.MessageHandler.isInstance( l.get( 2 ) )def create_pattern() :	return MessagePattern.createPattern( java.util.List, test() )def register( ag ) :	ag.registerHandler( create_pattern(), expander() )