How to use

isEmpty

method

in

org.apache.hbase.thirdparty.org.apache.commons.collections4.MapUtils

void filterCellByStore(Entry logEntry) {
 Map<byte[], Long> maxSeqIdInStores =
   regionMaxSeqIdInStores.get(Bytes.toString(logEntry.getKey().getEncodedRegionName()));
 if (MapUtils.isEmpty(maxSeqIdInStores)) {
  return;
 }
 // Create the array list for the cells that aren't filtered.
 // We make the assumption that most cells will be kept.
 ArrayList<Cell> keptCells = new ArrayList<>(logEntry.getEdit().getCells().size());
 for (Cell cell : logEntry.getEdit().getCells()) {
  if (CellUtil.matchingFamily(cell, WALEdit.METAFAMILY)) {
   keptCells.add(cell);
  } else {
   byte[] family = CellUtil.cloneFamily(cell);
   Long maxSeqId = maxSeqIdInStores.get(family);
   // Do not skip cell even if maxSeqId is null. Maybe we are in a rolling upgrade,
   // or the master was crashed before and we can not get the information.
   if (maxSeqId == null || maxSeqId.longValue() < logEntry.getKey().getSequenceId()) {
    keptCells.add(cell);
   }
  }
 }
 // Anything in the keptCells array list is still live.
 // So rather than removing the cells from the array list
 // which would be an O(n^2) operation, we just replace the list
 logEntry.getEdit().setCells(keptCells);
}

/**
 * Null-safe check if the specified map is not empty.
 * <p>
 * Null returns false.
 *
 * @param map  the map to check, may be null
 * @return true if non-null and non-empty
 * @since 3.2
 */
public static boolean isNotEmpty(final Map<?,?> map) {
  return !MapUtils.isEmpty(map);
}