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.

          matches = true;
        } else if (result.size() > 0 && result.get(0).getValueLength() == 0 &&
            valueIsNull) {
          matches = true;
        } else if (result.size() == 1 && !valueIsNull) {
          Cell kv = result.get(0);
          int compareResult = comparator.compareTo(kv.getValueArray(),
              kv.getValueOffset(), kv.getValueLength());
          switch (compareOp) {
          case LESS:
            matches = compareResult <= 0;
            break;
          case LESS_OR_EQUAL:

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            // found, otherwise add new column initialized to the increment amount
            int idx = 0;
            for (Cell kv: family.getValue()) {
              long amount = Bytes.toLong(CellUtil.cloneValue(kv));
              if (idx < results.size() && CellUtil.matchingQualifier(results.get(idx), kv)) {
                Cell c = results.get(idx);
                if(c.getValueLength() == Bytes.SIZEOF_LONG) {
                  amount += Bytes.toLong(c.getValueArray(), c.getValueOffset(), Bytes.SIZEOF_LONG);
                } else {
                  // throw DoNotRetryIOException instead of IllegalArgumentException
                  throw new org.apache.hadoop.hbase.DoNotRetryIOException(
                      "Attempted to increment field that isn't 64 bits wide");
                }

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  }


  protected int binarySearch(final Cell [] kvs,
                             final byte [] family,
                             final byte [] qualifier) {
    Cell searchTerm =
        KeyValue.createFirstOnRow(CellUtil.cloneRow(kvs[0]),
            family, qualifier);


    // pos === ( -(insertion point) - 1)
    int pos = Arrays.binarySearch(kvs, searchTerm, KeyValue.COMPARATOR);

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    if (buffer == null || keyValueSize > buffer.length) {
      // pad to the smallest multiple of the pad width
      buffer = new byte[(int) Math.ceil(keyValueSize / PAD_WIDTH) * PAD_WIDTH];
    }


    Cell searchTerm = KeyValue.createFirstOnRow(buffer, 0,
        kvs[0].getRowArray(), kvs[0].getRowOffset(), kvs[0].getRowLength(),
        family, foffset, flength,
        qualifier, qoffset, qlength);


    // pos === ( -(insertion point) - 1)

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   * @param family family name
   * @param qualifier column qualifier
   * @return value of latest version of column, null if none found
   */
  public byte[] getValue(byte [] family, byte [] qualifier) {
    Cell kv = getColumnLatestCell(family, qualifier);
    if (kv == null) {
      return null;
    }
    return CellUtil.cloneValue(kv);
  }

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   *
   * @return the latest version of the column, or <code>null</code> if none found
   */
  public ByteBuffer getValueAsByteBuffer(byte [] family, byte [] qualifier) {


    Cell kv = getColumnLatestCell(family, 0, family.length, qualifier, 0, qualifier.length);


    if (kv == null) {
      return null;
    }
    return ByteBuffer.wrap(kv.getValueArray(), kv.getValueOffset(), kv.getValueLength());
  }

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   * @return the latest version of the column, or <code>null</code> if none found
   */
  public ByteBuffer getValueAsByteBuffer(byte [] family, int foffset, int flength,
      byte [] qualifier, int qoffset, int qlength) {


    Cell kv = getColumnLatestCell(family, foffset, flength, qualifier, qoffset, qlength);


    if (kv == null) {
      return null;
    }
    return ByteBuffer.wrap(kv.getValueArray(), kv.getValueOffset(), kv.getValueLength());
  }

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   * @throws BufferOverflowException there is insufficient space remaining in the buffer
   */
  public boolean loadValue(byte [] family, int foffset, int flength,
      byte [] qualifier, int qoffset, int qlength, ByteBuffer dst)
          throws BufferOverflowException {
    Cell kv = getColumnLatestCell(family, foffset, flength, qualifier, qoffset, qlength);


    if (kv == null) {
      return false;
    }
    dst.put(kv.getValueArray(), kv.getValueOffset(), kv.getValueLength());
    return true;
  }

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   * @return whether or not a latest value exists and is not empty
   */
  public boolean containsNonEmptyColumn(byte [] family, int foffset, int flength,
      byte [] qualifier, int qoffset, int qlength) {


    Cell kv = getColumnLatestCell(family, foffset, flength, qualifier, qoffset, qlength);


    return (kv != null) && (kv.getValueLength() > 0);
  }

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   *
   * @return whether or not a latest value exists and is empty
   */
  public boolean containsEmptyColumn(byte [] family, int foffset, int flength,
      byte [] qualifier, int qoffset, int qlength) {
    Cell kv = getColumnLatestCell(family, foffset, flength, qualifier, qoffset, qlength);


    return (kv != null) && (kv.getValueLength() == 0);
  }

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