Examples of org.apache.hadoop.hbase.filter.RowFilter

org.apache.hadoop.hbase.filter.RowFilter
This filter is used to filter based on the key. It takes an operator (equal, greater, not equal, etc) and a byte [] comparator for the row, and column qualifier portions of a key.
This filter can be wrapped with {@link WhileMatchFilter} to add more control.
Multiple filters can be combined using {@link FilterList}.
If an already known row range needs to be scanned, use {@link Scan} startand stop rows directly rather than a filter.

    // Make sure key is of some substance... non-null and > than first key.
    assertTrue(key != null && key.length > 0 &&
      Bytes.BYTES_COMPARATOR.compare(key, new byte [] {'a', 'a', 'a'}) >= 0);
    LOG.info("Key=" + Bytes.toString(key));
    Scan s = startRow == null? new Scan(): new Scan(startRow);
    Filter f = new RowFilter(op, new BinaryComparator(key));
    f = new WhileMatchFilter(f);
    s.setFilter(f);
    return s;
  }

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    putThread.start();
    FlushThread flushThread = new FlushThread();
    flushThread.start();


    Scan scan = new Scan();
    scan.setFilter(new RowFilter(CompareFilter.CompareOp.EQUAL,
      new BinaryComparator(Bytes.toBytes("row0"))));


    int expectedCount = numFamilies * numQualifiers;
    List<KeyValue> res = new ArrayList<KeyValue>();

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        if (key.length == 0 || option == null) 
            return false;


        BinaryComparator comp = new BinaryComparator(option);
        RowFilter rowFilter = new RowFilter(op, comp);
        return rowFilter.filterRowKey(key, 0, key.length);
    }

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        LOG.info("Adding filter " + op.toString() + " with value " + Bytes.toStringBinary(val));
        FilterList scanFilter = (FilterList) scan.getFilter();
        if (scanFilter == null) {
            scanFilter = new FilterList();
        }
        scanFilter.addFilter(new RowFilter(op, new BinaryComparator(val)));
        scan.setFilter(scanFilter);
    }

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    SplitLogTask sltDeserialized = SplitLogTask.parseFrom(bytes);
    assertTrue(slt.equals(sltDeserialized));
  }


  @Test public void testCompareFilter() throws Exception {
    Filter f = new RowFilter(CompareOp.EQUAL,
      new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    byte [] bytes = f.toByteArray();
    Filter ff = RowFilter.parseFrom(bytes);
    assertNotNull(ff);
  }

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    HServerLoad hsl = (HServerLoad)Writables.getWritable(hsl092bytes, new HServerLoad());
    // TO BE CONTINUED
  }


  @Test public void testCompareFilter() throws Exception {
    Filter f = new RowFilter(CompareOp.EQUAL,
      new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    byte [] bytes = Writables.getBytes(f);
    Filter ff = (Filter)Writables.getWritable(bytes, new RowFilter());
    assertNotNull(ff);
  }

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    // Make sure key is of some substance... non-null and > than first key.
    assertTrue(key != null && key.length > 0 &&
      Bytes.BYTES_COMPARATOR.compare(key, new byte [] {'a', 'a', 'a'}) >= 0);
    LOG.info("Key=" + Bytes.toString(key));
    Scan s = startRow == null? new Scan(): new Scan(startRow);
    Filter f = new RowFilter(op, new BinaryComparator(key));
    f = new WhileMatchFilter(f);
    s.setFilter(f);
    return s;
  }

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    Scan scan = new Scan();
    scan.setStartRow(Bytes.toBytes(1));
    scan.setStopRow(Bytes.toBytes(3));
    scan.addColumn(FAMILY, FAMILY);
    scan.setFilter(new RowFilter(CompareFilter.CompareOp.NOT_EQUAL, new BinaryComparator(Bytes.toBytes(1))));


    ResultScanner scanner = foo.getScanner(scan);
    Result[] bar = scanner.next(100);
    assertEquals(1, bar.length);
  }

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      scan.addColumn(family.getBytes(), column.getBytes());
      scan.setStartRow(startRow.getBytes());
      scan.setTimeRange(startTime, endTime);
      scan.setMaxVersions();
      if(filterByRowKey) {
        RowFilter rf = new RowFilter(CompareOp.EQUAL, new 
            RegexStringComparator("[0-9]+-"+rkey+"$")); 
        scan.setFilter(rf);
      }
      ResultScanner results = table.getScanner(scan);
      Iterator<Result> it = results.iterator();

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    // Make sure key is of some substance... non-null and > than first key.
    assertTrue(key != null && key.length > 0 &&
      Bytes.BYTES_COMPARATOR.compare(key, new byte [] {'a', 'a', 'a'}) >= 0);
    LOG.info("Key=" + Bytes.toString(key));
    Scan s = startRow == null? new Scan(): new Scan(startRow);
    Filter f = new RowFilter(op, new BinaryComparator(key));
    f = new WhileMatchFilter(f);
    s.setFilter(f);
    return s;
  }

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