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.

  public void testFilterList() throws Exception {
    // Test getting a single row, single key using Row, Qualifier, and Value 
    // regular expression and substring filters
    // Use must pass all
    List<Filter> filters = new ArrayList<Filter>();
    filters.add(new RowFilter(CompareOp.EQUAL,
      new RegexStringComparator(".+-2")));
    filters.add(new QualifierFilter(CompareOp.EQUAL,
      new RegexStringComparator(".+-2")));
    filters.add(new ValueFilter(CompareOp.EQUAL,
      new SubstringComparator("One")));
    Filter f = new FilterList(Operator.MUST_PASS_ALL, filters);
    Scan s = new Scan();
    s.addFamily(FAMILIES[0]);
    s.setFilter(f);
    KeyValue [] kvs = {
        new KeyValue(ROWS_ONE[2], FAMILIES[0], QUALIFIERS_ONE[2], VALUES[0])
    };
    verifyScanFull(s, kvs);


    // Test getting everything with a MUST_PASS_ONE filter including row, qf,
    // val, regular expression and substring filters
    filters.clear();
    filters.add(new RowFilter(CompareOp.EQUAL,
      new RegexStringComparator(".+Two.+")));
    filters.add(new QualifierFilter(CompareOp.EQUAL,
      new RegexStringComparator(".+-2")));
    filters.add(new ValueFilter(CompareOp.EQUAL,
      new SubstringComparator("One")));

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        break;
      case RandomRowFilter:
        filter = new RandomRowFilter(chance);
        break;
      case RowFilter:
        filter = new RowFilter(CompareOp.valueOf(op), comparator.build());
        break;
      case SingleColumnValueFilter:
        filter = new SingleColumnValueFilter(Base64.decode(family),
          qualifier != null ? Base64.decode(qualifier) : null,
          CompareOp.valueOf(op), comparator.build());

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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.setStopRow(increment(lte_));
            }


            // The WhileMatchFilter will short-circuit the scan after we no longer match. The
            // setStopRow call will limit the number of regions we need to scan
            addFilter(new WhileMatchFilter(new RowFilter(CompareOp.LESS_OR_EQUAL, new BinaryComparator(lte_))));
        }
        if (configuredOptions_.hasOption("regex")) {
            regex_ = Utils.slashisize(configuredOptions_.getOptionValue("regex"));
            addFilter(new RowFilter(CompareOp.EQUAL, new RegexStringComparator(regex_)));
        }
        if (configuredOptions_.hasOption("minTimestamp") || configuredOptions_.hasOption("maxTimestamp")){
            scan.setTimeRange(minTimestamp_, maxTimestamp_);
        }
        if (configuredOptions_.hasOption("timestamp")){

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    private void addRowFilter(CompareOp op, byte[] val) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Adding filter " + op.toString() +
                    " with value " + Bytes.toStringBinary(val));
        }
        addFilter(new RowFilter(op, new BinaryComparator(val)));
    }

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    // Add a WhileMatchFilter to make the scan terminate as soon
    // as we see a non-matching key.  This is probably redundant
    // since the stopRow above should already take care of it for us.
    scan.setFilter(
      new WhileMatchFilter(
        new RowFilter(
          CompareFilter.CompareOp.EQUAL,
          new BinaryComparator(startRow))));
    return tableSplit;
  }

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                scan.setStopRow(increment(lte_));
            }


            // The WhileMatchFilter will short-circuit the scan after we no longer match. The
            // setStopRow call will limit the number of regions we need to scan
            addFilter(new WhileMatchFilter(new RowFilter(CompareOp.LESS_OR_EQUAL, new BinaryComparator(lte_))));
        }
        if (configuredOptions_.hasOption("regex")) {
            regex_ = Utils.slashisize(configuredOptions_.getOptionValue("regex"));
            addFilter(new RowFilter(CompareOp.EQUAL, new RegexStringComparator(regex_)));
        }
        if (configuredOptions_.hasOption("minTimestamp") || configuredOptions_.hasOption("maxTimestamp")){
            scan.setTimeRange(minTimestamp_, maxTimestamp_);
        }
        if (configuredOptions_.hasOption("timestamp")){

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    private void addRowFilter(CompareOp op, byte[] val) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Adding filter " + op.toString() +
                    " with value " + Bytes.toStringBinary(val));
        }
        addFilter(new RowFilter(op, new BinaryComparator(val)));
    }

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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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