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

org.apache.hadoop.hbase.filter.QualifierFilter
This filter is used to filter based on the column qualifier. It takes an operator (equal, greater, not equal, etc) and a byte [] comparator for the column qualifier portion of a key.
This filter can be wrapped with {@link WhileMatchFilter} and {@link SkipFilter}to add more control.
Multiple filters can be combined using {@link FilterList}.
If an already known column qualifier is looked for, use {@link Get#addColumn}directly rather than a filter.

      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new QualifierFilter(CompareOp.EQUAL,
        new RegexStringComparator("col[1-5]"));
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int expectedIndex = 1;
    for(Result result : ht.getScanner(scan)) {

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      Scan scan = new Scan();
      scan.addFamily(ACL_LIST_FAMILY);


      String columnName = Bytes.toString(column);
      scan.setFilter(new QualifierFilter(CompareOp.EQUAL, new RegexStringComparator(
                     String.format("(%s%s%s)|(%s%s)$",
                     ACL_KEY_DELIMITER, columnName, ACL_KEY_DELIMITER,
                     ACL_KEY_DELIMITER, columnName))));


      Set<byte[]> qualifierSet = new TreeSet<byte[]>(Bytes.BYTES_COMPARATOR);

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      Scan scan = new Scan();
      scan.addFamily(ACL_LIST_FAMILY);


      String columnName = Bytes.toString(column);
      scan.setFilter(new QualifierFilter(CompareOp.EQUAL, new RegexStringComparator(
                     String.format("(%s%s%s)|(%s%s)$",
                     ACL_KEY_DELIMITER, columnName, ACL_KEY_DELIMITER,
                     ACL_KEY_DELIMITER, columnName))));


      Set<byte[]> qualifierSet = new TreeSet<byte[]>(Bytes.BYTES_COMPARATOR);

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new QualifierFilter(CompareOp.EQUAL,
      new RegexStringComparator("col[1-5]"));
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int expectedIndex = 1;
    for(Result result : ht.getScanner(scan)) {

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new QualifierFilter(CompareOp.EQUAL,
        new RegexStringComparator("col[1-5]"));
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int expectedIndex = 1;
    for(Result result : ht.getScanner(scan)) {

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new QualifierFilter(CompareOp.EQUAL,
      new RegexStringComparator("col[1-5]"));
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int expectedIndex = 1;
    for(Result result : ht.getScanner(scan)) {

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      ht.put(put);
    }
    Scan scan = new Scan();
    scan.setReversed(true);
    scan.addFamily(FAMILY);
    Filter filter = new QualifierFilter(CompareOp.EQUAL,
        new RegexStringComparator("col[1-5]"));
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int expectedIndex = 5;
    for (Result result : scanner) {

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  @Test
  public void testQualifierFilter() throws Exception {
    // Match two keys (one from each family) in half the rows
    long expectedRows = numRows / 2;
    long expectedKeys = 2;
    Filter f = new QualifierFilter(CompareOp.EQUAL,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2")));
    Scan s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys less than same qualifier
    // Expect only two keys (one from each family) in half the rows
    expectedRows = numRows / 2;
    expectedKeys = 2;
    f = new QualifierFilter(CompareOp.LESS,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys less than or equal
    // Expect four keys (two from each family) in half the rows
    expectedRows = numRows / 2;
    expectedKeys = 4;
    f = new QualifierFilter(CompareOp.LESS_OR_EQUAL,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2")));
    s = new Scan();
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys not equal
    // Expect four keys (two from each family)
    // Only look in first group of rows
    expectedRows = numRows / 2;
    expectedKeys = 4;
    f = new QualifierFilter(CompareOp.NOT_EQUAL,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2")));
    s = new Scan(HConstants.EMPTY_START_ROW, Bytes.toBytes("testRowTwo"));
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys greater or equal
    // Expect four keys (two from each family)
    // Only look in first group of rows
    expectedRows = numRows / 2;
    expectedKeys = 4;
    f = new QualifierFilter(CompareOp.GREATER_OR_EQUAL,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2")));
    s = new Scan(HConstants.EMPTY_START_ROW, Bytes.toBytes("testRowTwo"));
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys greater
    // Expect two keys (one from each family)
    // Only look in first group of rows
    expectedRows = numRows / 2;
    expectedKeys = 2;
    f = new QualifierFilter(CompareOp.GREATER,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2")));
    s = new Scan(HConstants.EMPTY_START_ROW, Bytes.toBytes("testRowTwo"));
    s.setFilter(f);
    verifyScanNoEarlyOut(s, expectedRows, expectedKeys);
    
    // Match keys not equal to
    // Look across rows and fully validate the keys and ordering
    // Expect varied numbers of keys, 4 per row in group one, 6 per row in
    // group two
    f = new QualifierFilter(CompareOp.NOT_EQUAL,
        new BinaryComparator(QUALIFIERS_ONE[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[3], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[1], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[0], FAMILIES[1], QUALIFIERS_ONE[3], VALUES[0]),
        // testRowOne-2
        new KeyValue(ROWS_ONE[2], FAMILIES[0], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[2], FAMILIES[0], QUALIFIERS_ONE[3], VALUES[0]),
        new KeyValue(ROWS_ONE[2], FAMILIES[1], QUALIFIERS_ONE[0], VALUES[0]),
        new KeyValue(ROWS_ONE[2], 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[3], VALUES[0]),
        new KeyValue(ROWS_ONE[3], FAMILIES[1], QUALIFIERS_ONE[0], 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 "test*-2"
    // Expect 4 keys per row across both groups
    f = new QualifierFilter(CompareOp.NOT_EQUAL,
        new RegexStringComparator("test.+-2"));
    s = new Scan();
    s.setFilter(f);
    
    kvs = new KeyValue [] {

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  @Test
  public void testSkipFilter() throws Exception {
    // Test for qualifier regex: "testQualifierOne-2"
    // Should only get rows from second group, and all keys
    Filter f = new SkipFilter(new QualifierFilter(CompareOp.NOT_EQUAL,
        new BinaryComparator(Bytes.toBytes("testQualifierOne-2"))));
    Scan s = new Scan();
    s.setFilter(f);
    
    KeyValue [] kvs = {

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    // 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")));
    f = new FilterList(Operator.MUST_PASS_ONE, filters);
    s = new Scan();

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