public void close(){
  if (data != null) {
    data.clear();
    data=null;
  }
  if (headers != null) {
    headers.clear();
    headers=null;
  }
  if (timeToDataIndex != null) {
    timeToDataIndex.clear();
    timeToDataIndex=null;
  }
}

public void close ( ) { if ( data != null ) { data . clear ( ) ; data = null ; } if ( headers != null ) { headers . clear ( ) ; headers = null ; } if ( timeToDataIndex != null ) { timeToDataIndex . clear ( ) ; timeToDataIndex = null ; } }
reset object ' s data collections
