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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    // 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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    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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    Filter rowFilter = null;
    String filterCriteria = (args.length > 3) ? args[3]: null;
    if (filterCriteria == null) return null;
    if (filterCriteria.startsWith("^")) {
      String regexPattern = filterCriteria.substring(1, filterCriteria.length());
      rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator(regexPattern));
    } else {
      rowFilter = new PrefixFilter(Bytes.toBytes(filterCriteria));
    }
    return rowFilter;
  }

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    Filter rowFilter = null;
    String filterCriteria = (args.length > 3) ? args[3]: null;
    if (filterCriteria == null) return null;
    if (filterCriteria.startsWith("^")) {
      String regexPattern = filterCriteria.substring(1, filterCriteria.length());
      rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator(regexPattern));
    } else {
      rowFilter = new PrefixFilter(Bytes.toBytes(filterCriteria));
    }
    return rowFilter;
  }

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    Filter exportFilter = null;
    String filterCriteria = (args.length > 5) ? args[5]: null;
    if (filterCriteria == null) return null;
    if (filterCriteria.startsWith("^")) {
      String regexPattern = filterCriteria.substring(1, filterCriteria.length());
      exportFilter = new RowFilter(CompareOp.EQUAL, new RegexStringComparator(regexPattern));
    } else {
      exportFilter = new PrefixFilter(Bytes.toBytes(filterCriteria));
    }
    return exportFilter;
  }

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  @Test
  public void testRowFilter() throws Exception {
    // Match a single row, all keys
    long expectedRows = 1;
    long expectedKeys = colsPerRow;
    Filter f = new RowFilter(CompareOp.EQUAL,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    Scan s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match a two rows, one from each group, using regex
    expectedRows = 2;
    expectedKeys = colsPerRow;
    f = new RowFilter(CompareOp.EQUAL,
        new RegexStringComparator("testRow.+-2"));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match rows less than
    // Expect all keys in one row
    expectedRows = 1;
    expectedKeys = colsPerRow;
    f = new RowFilter(CompareOp.LESS,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match rows less than or equal
    // Expect all keys in two rows
    expectedRows = 2;
    expectedKeys = colsPerRow;
    f = new RowFilter(CompareOp.LESS_OR_EQUAL,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match rows not equal
    // Expect all keys in all but one row
    expectedRows = numRows - 1;
    expectedKeys = colsPerRow;
    f = new RowFilter(CompareOp.NOT_EQUAL,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys greater or equal
    // Expect all keys in all but one row
    expectedRows = numRows - 1;
    expectedKeys = colsPerRow;
    f = new RowFilter(CompareOp.GREATER_OR_EQUAL,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys greater
    // Expect all keys in all but two rows
    expectedRows = numRows - 2;
    expectedKeys = colsPerRow;
    f = new RowFilter(CompareOp.GREATER,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match rows not equal to testRowTwo-2
    // Look across rows and fully validate the keys and ordering
    // Should see all keys in all rows but testRowTwo-2
    f = new RowFilter(CompareOp.NOT_EQUAL,
        new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    s = new Scan();
    s.setFilter(f);
    
    KeyValue [] kvs = {
        // testRowOne-0
        new KeyValue(ROWS_ONE[0], FAMILIES[0], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[0], QUALIFIERS_ONE[2], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[0], QUALIFIERS_ONE[3], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[1], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[1], QUALIFIERS_ONE[2], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[1], QUALIFIERS_ONE[3], VALUES[0]),
        // testRowOne-3
        new KeyValue(ROWS_ONE[3], FAMILIES[0], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[3], FAMILIES[0], QUALIFIERS_ONE[2], VALUES[0]),
        new KeyValue(ROWS_ONE[3], FAMILIES[0], QUALIFIERS_ONE[3], VALUES[0]),
        new KeyValue(ROWS_ONE[3], FAMILIES[1], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[3], FAMILIES[1], QUALIFIERS_ONE[2], VALUES[0]),
        new KeyValue(ROWS_ONE[3], FAMILIES[1], QUALIFIERS_ONE[3], VALUES[0]),
        // testRowTwo-0
        new KeyValue(ROWS_TWO[0], FAMILIES[0], QUALIFIERS_TWO[0], VALUES[1]),
        new KeyValue(ROWS_TWO[0], FAMILIES[0], QUALIFIERS_TWO[2], VALUES[1]),
        new KeyValue(ROWS_TWO[0], FAMILIES[0], QUALIFIERS_TWO[3], VALUES[1]),
        new KeyValue(ROWS_TWO[0], FAMILIES[1], QUALIFIERS_TWO[0], VALUES[1]),
        new KeyValue(ROWS_TWO[0], FAMILIES[1], QUALIFIERS_TWO[2], VALUES[1]),
        new KeyValue(ROWS_TWO[0], FAMILIES[1], QUALIFIERS_TWO[3], VALUES[1]),
        // testRowTwo-2
        new KeyValue(ROWS_TWO[2], FAMILIES[0], QUALIFIERS_TWO[0], VALUES[1]),
        new KeyValue(ROWS_TWO[2], FAMILIES[0], QUALIFIERS_TWO[2], VALUES[1]),
        new KeyValue(ROWS_TWO[2], FAMILIES[0], QUALIFIERS_TWO[3], VALUES[1]),
        new KeyValue(ROWS_TWO[2], FAMILIES[1], QUALIFIERS_TWO[0], VALUES[1]),
        new KeyValue(ROWS_TWO[2], FAMILIES[1], QUALIFIERS_TWO[2], VALUES[1]),
        new KeyValue(ROWS_TWO[2], FAMILIES[1], QUALIFIERS_TWO[3], VALUES[1]),
        // testRowTwo-3
        new KeyValue(ROWS_TWO[3], FAMILIES[0], QUALIFIERS_TWO[0], VALUES[1]),
        new KeyValue(ROWS_TWO[3], FAMILIES[0], QUALIFIERS_TWO[2], VALUES[1]),
        new KeyValue(ROWS_TWO[3], FAMILIES[0], QUALIFIERS_TWO[3], VALUES[1]),
        new KeyValue(ROWS_TWO[3], FAMILIES[1], QUALIFIERS_TWO[0], VALUES[1]),
        new KeyValue(ROWS_TWO[3], FAMILIES[1], QUALIFIERS_TWO[2], VALUES[1]),
        new KeyValue(ROWS_TWO[3], FAMILIES[1], QUALIFIERS_TWO[3], VALUES[1]),
    };
    verifyScanFull(s, kvs);
    
    // Test across rows and groups with a regex
    // Filter out everything that doesn't match "*-2"
    // Expect all keys in two rows
    f = new RowFilter(CompareOp.EQUAL,
        new RegexStringComparator(".+-2"));
    s = new Scan();
    s.setFilter(f);
    
    kvs = new KeyValue [] {

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  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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 * Test HBase Writables serializations
 */
public class TestSerialization {


  @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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