question: public final void printMessageUserData ( IStructuredOutputWriter out , String msgId ) throws Exception { final Integer iid = m_seenMsgIds . get ( msgId ) ; if ( iid == null ) { out . simpleChild ( "status" , "new" ) ; return ; } final Integer clusterId = m_msgInternalIdToCluster . get ( iid ) ; if ( clusterId == null || clusterId < 0 ) { out . simpleChild ( "status" , "unclusterd" ) ; return ; } out . simpleChild ( "status" , "clustered" ) ; out . simpleChild ( "clusterId" , clusterId ) ; out . simpleChild ( "clusterName" , getClusterName ( clusterId ) ) ; out . simpleChild ( "clusterSize" , getClusterSize ( clusterId ) ) ; }
target:  Prints the how messages ids have been assigned to a cluster.