Examples of org.apache.hadoop.hbase.Cell

org.apache.hadoop.hbase.Cell
The unit of storage in HBase consisting of the following fields:
```
 1) row 2) column family 3) column qualifier 4) timestamp 5) type 6) MVCC version 7) value 
```
Uniqueness is determined by the combination of row, column family, column qualifier, timestamp, and type.
The natural comparator will perform a bitwise comparison on row, column family, and column qualifier. Less intuitively, it will then treat the greater timestamp as the lesser value with the goal of sorting newer cells first.
This interface does not include methods that allocate new byte[]'s such as those used in client or debugging code. These should be placed in a sub-interface or the {@link CellUtil} class.
Cell implements Comparable which is only meaningful when comparing to other keys in the same table. It uses CellComparator which does not work on the -ROOT- and .META. tables.
In the future, we may consider adding a boolean isOnHeap() method and a getValueBuffer() method that can be used to pass a value directly from an off-heap ByteBuffer to the network without copying into an on-heap byte[].
Historic note: the original Cell implementation (KeyValue) requires that all fields be encoded as consecutive bytes in the same byte[], whereas this interface allows fields to reside in separate byte[]'s.

              timestamp = kv.getTimestamp();
            }
          }
          assertTrue(timestamp >= prevTimestamp);
          prevTimestamp = timestamp;
          Cell previousKV = null;


          for (Cell kv : result.rawCells()) {
            byte[] thisValue = CellUtil.cloneValue(kv);
            if (previousKV != null) {
              if (Bytes.compareTo(CellUtil.cloneValue(previousKV), thisValue) != 0) {
                LOG.warn("These two KV should have the same value." + " Previous KV:" + previousKV
                    + "(memStoreTS:" + previousKV.getMvccVersion() + ")" + ", New KV: " + kv
                    + "(memStoreTS:" + kv.getMvccVersion() + ")");
                assertEquals(0, Bytes.compareTo(CellUtil.cloneValue(previousKV), thisValue));
              }
            }
            previousKV = kv;

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    Result res = this.region.get(get);
    List<Cell> kvs = res.getColumnCells(Incrementer.family, Incrementer.qualifier);


    // we just got the latest version
    assertEquals(kvs.size(), 1);
    Cell kv = kvs.get(0);
    assertEquals(expected, Bytes.toLong(kv.getValueArray(), kv.getValueOffset()));
    this.region = null;
  }

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    Result res = this.region.get(get);
    List<Cell> kvs = res.getColumnCells(Appender.family, Appender.qualifier);


    // we just got the latest version
    assertEquals(kvs.size(), 1);
    Cell kv = kvs.get(0);
    byte[] appendResult = new byte[kv.getValueLength()];
    System.arraycopy(kv.getValueArray(), kv.getValueOffset(), appendResult, 0, kv.getValueLength());
    assertArrayEquals(expected, appendResult);
    this.region = null;
  }

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  }


  @Override
  public void filterRowCells(List<Cell> kvs) {
    Iterator<? extends Cell> it = kvs.iterator();
    Cell kv;
    while(it.hasNext()) {
      kv = it.next();
      if(!stampSet.contains(kv.getTimestamp())) {
        it.remove();
      }
    }
  }

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      for (int i = 0; i < cellCount; i++) {
        if (!cellScanner.advance()) {
          throw new DoNotRetryIOException("Cell count of " + cellCount + " but at index " + i +
            " no cell returned: " + toShortString(proto));
        }
        Cell cell = cellScanner.current();
        if (put == null) {
          put = new Put(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength(), timestamp);
        }
        put.add(cell);
      }
    } else {
      if (proto.hasRow()) {

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        if (!cellScanner.advance()) {
          // TextFormat should be fine for a Delete since it carries no data, just coordinates.
          throw new DoNotRetryIOException("Cell count of " + cellCount + " but at index " + i +
            " no cell returned: " + TextFormat.shortDebugString(proto));
        }
        Cell cell = cellScanner.current();
        if (delete == null) {
          delete =
            new Delete(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength(), timestamp);
        }
        delete.addDeleteMarker(KeyValueUtil.ensureKeyValue(cell));
      }
    } else {
      delete = new Delete(row, timestamp);

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      for (int i = 0; i < cellCount; i++) {
        if (!cellScanner.advance()) {
          throw new DoNotRetryIOException("Cell count of " + cellCount + " but at index " + i +
            " no cell returned: " + toShortString(proto));
        }
        Cell cell = cellScanner.current();
        if (append == null) {
          append = new Append(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength());
        }
        append.add(KeyValueUtil.ensureKeyValue(cell));
      }
    } else {
      append = new Append(row);

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      for (int i = 0; i < cellCount; i++) {
        if (!cellScanner.advance()) {
          throw new DoNotRetryIOException("Cell count of " + cellCount + " but at index " + i +
            " no cell returned: " + TextFormat.shortDebugString(proto));
        }
        Cell cell = cellScanner.current();
        if (increment == null) {
          increment = new Increment(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength());
        }
        increment.add(KeyValueUtil.ensureKeyValue(cell));
      }
    } else {
      increment = new Increment(row);

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        familyMap1.put(new SimpleByteRange(entry.getKey()), (List<Cell>) entry.getValue());
      }
    }
    RegionScanner scanner = getRegion(e).getScanner(new Scan(get));
    List<Cell> cells = Lists.newArrayList();
    Cell prevCell = null;
    ByteRange curFam = new SimpleByteRange();
    boolean curColAllVersions = (request == OpType.DELETE);
    long curColCheckTs = opTs;
    boolean foundColumn = false;
    try {

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    // We already checked (prePut vs preBatchMutation)
    if (m.getAttribute(TAG_CHECK_PASSED) != null) {
      return;
    }
    for (CellScanner cellScanner = m.cellScanner(); cellScanner.advance();) {
      Cell cell = cellScanner.current();
      if (cell.getTagsLengthUnsigned() > 0) {
        Iterator<Tag> tagsItr = CellUtil.tagsIterator(cell.getTagsArray(), cell.getTagsOffset(),
          cell.getTagsLengthUnsigned());
        while (tagsItr.hasNext()) {
          if (tagsItr.next().getType() == AccessControlLists.ACL_TAG_TYPE) {
            throw new AccessDeniedException("Mutation contains cell with reserved type tag");
          }
        }

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