question: public static _Fields findByThriftId ( int fieldId ) { switch ( fieldId ) { case 1 : return MESSAGE_TYPE ; case 2 : return REQUEST_INFO ; case 3 : return RESPONSE_INFO ; case 4 : return TRACE_INFO ; case 5 : return GLOBAL_CONTEXT ; case 6 : return LOCAL_CONTEXT ; case 7 : return HEARTBEAT_INFO ; default : return null ; } }
target:  Find the _Fields constant that matches fieldId, or null if its not found.