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.


  public static void verifyRowFromMap(ImmutableBytesWritable key, Result result) throws IOException {
    byte[] row = key.get();
    CellScanner scanner = result.cellScanner();
    while (scanner.advance()) {
      Cell cell = scanner.current();


      //assert that all Cells in the Result have the same key
     Assert.assertEquals(0, Bytes.compareTo(row, 0, row.length,
         cell.getRowArray(), cell.getRowOffset(), cell.getRowLength()));
    }


    for (int j = 0; j < FAMILIES.length; j++) {
      byte[] actual = result.getValue(FAMILIES[j], null);
      Assert.assertArrayEquals("Row in snapshot does not match, expected:" + Bytes.toString(row)

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      Result[] next = scanner.next(3);


      assertTrue(next.length == 2);
      CellScanner cellScanner = next[0].cellScanner();
      cellScanner.advance();
      Cell current = cellScanner.current();
      assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
          current.getRowLength(), row1, 0, row1.length));
      cellScanner = next[1].cellScanner();
      cellScanner.advance();
      current = cellScanner.current();
      assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
          current.getRowLength(), row2, 0, row2.length));
    } finally {
      if (table != null) {
        table.close();
      }
    }

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      ResultScanner scanner = table.getScanner(s);
      Result[] next = scanner.next(4);
      assertEquals(3, next.length);
      CellScanner cellScanner = next[0].cellScanner();
      cellScanner.advance();
      Cell current = cellScanner.current();
      assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
          current.getRowLength(), row2, 0, row2.length));
      cellScanner = next[1].cellScanner();
      cellScanner.advance();
      current = cellScanner.current();
      assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
          current.getRowLength(), row3, 0, row3.length));
      cellScanner = next[2].cellScanner();
      cellScanner.advance();
      current = cellScanner.current();
      assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
          current.getRowLength(), row4, 0, row4.length));
    } finally {
      if (table != null) {
        table.close();
      }
    }

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    try {
      Get get = new Get(row1);
      get.setAuthorizations(new Authorizations(SECRET, CONFIDENTIAL));
      Result result = table.get(get);
      assertTrue(!result.isEmpty());
      Cell cell = result.getColumnLatestCell(fam, qual);
      assertTrue(Bytes.equals(value, 0, value.length, cell.getValueArray(), cell.getValueOffset(),
          cell.getValueLength()));
    } finally {
      if (table != null) {
        table.close();
      }
    }

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      Scan scan = new Scan();
      scan.setAuthorizations(new Authorizations(VisibilityUtils.SYSTEM_LABEL));
      ResultScanner scanner = ht.getScanner(scan);
      Result result = null;
      while ((result = scanner.next()) != null) {
        Cell label = result.getColumnLatestCell(LABELS_TABLE_FAMILY, LABEL_QUALIFIER);
        Cell userAuth = result.getColumnLatestCell(LABELS_TABLE_FAMILY, user.getBytes());
        if (Bytes.equals(SECRET.getBytes(), 0, SECRET.getBytes().length, label.getValueArray(),
            label.getValueOffset(), label.getValueLength())
            || Bytes.equals(CONFIDENTIAL.getBytes(), 0, CONFIDENTIAL.getBytes().length,
                label.getValueArray(), label.getValueOffset(), label.getValueLength())) {
          assertNotNull(userAuth);

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        try {
          ht = new HTable(conf, LABELS_TABLE_NAME);
          ResultScanner scanner = ht.getScanner(new Scan());
          Result result = null;
          while ((result = scanner.next()) != null) {
            Cell label = result.getColumnLatestCell(LABELS_TABLE_FAMILY, LABEL_QUALIFIER);
            Cell userAuth = result.getColumnLatestCell(LABELS_TABLE_FAMILY, user.getBytes());
            if (Bytes.equals(PRIVATE.getBytes(), 0, PRIVATE.getBytes().length,
                label.getValueArray(), label.getValueOffset(), label.getValueLength())) {
              assertNotNull(userAuth);
            } else {
              assertNull(userAuth);

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                  long columnHash = Arrays.hashCode(column);
                  long hashCode = cfHash + columnHash;
                  byte[] hashCodeBytes = Bytes.toBytes(hashCode);
                  byte[] checkedValue = HConstants.EMPTY_BYTE_ARRAY;
                  if (hashCode % 2 == 0) {
                    Cell kv = result.getColumnLatestCell(cf, column);
                    checkedValue = kv != null ? CellUtil.cloneValue(kv) : null;
                    Preconditions.checkNotNull(checkedValue,
                        "Column value to be checked should not be null");
                  }
                  buf.setLength(0); // Clear the buffer

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          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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    for(int i=0;i<keys.length;i++) {
      byte [] family = families[idxs[i][0]];
      byte [] qualifier = qualifiers[idxs[i][1]];
      byte [] value = values[idxs[i][2]];
      Cell key = keys[i];


      byte[] famb = CellUtil.cloneFamily(key);
      byte[] qualb = CellUtil.cloneQualifier(key);
      byte[] valb = CellUtil.cloneValue(key);
      assertTrue("(" + i + ") Expected family [" + Bytes.toString(family)

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