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

org.apache.hadoop.hbase.filter.Filter
Interface for row and column filters directly applied within the regionserver. A filter can expect the following call sequence:
- {@link #reset()}
- {@link #filterAllRemaining()} -> true indicates scan is over, false, keep going on.
- {@link #filterRowKey(byte[],int,int)} -> true to drop this row,if false, we will also call
- {@link #filterKeyValue(KeyValue)} -> true to drop this key/value
- {@link #filterRow(List)} -> allows directmodification of the final list to be submitted
- {@link #filterRow()} -> last chance to drop entire row based on the sequence offilterValue() calls. Eg: filter a row if it doesn't contain a specified column.
Filter instances are created one per region/scan. This interface replaces the old RowFilterInterface. When implementing your own filters, consider inheriting {@link FilterBase} to helpyou reduce boilerplate. @see FilterBase

      ht.put(put);
    }
    Scan scan = new Scan();
    scan.setReversed(true);
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for (Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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        switch(qcode) {
          case INCLUDE:
          case INCLUDE_AND_SEEK_NEXT_ROW:
          case INCLUDE_AND_SEEK_NEXT_COL:


            Filter f = matcher.getFilter();
            outResult.add(f == null ? kv : f.transform(kv));
            count++;


            if (qcode == ScanQueryMatcher.MatchCode.INCLUDE_AND_SEEK_NEXT_ROW) {
              if (!matcher.moreRowsMayExistAfter(kv)) {
                return false;

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        if (scanner != null) scanner.close();
      }
    }


    protected Scan constructScan(byte[] valuePrefix) throws IOException {
      Filter filter = new SingleColumnValueFilter(
          FAMILY_NAME, QUALIFIER_NAME, CompareFilter.CompareOp.EQUAL,
          new BinaryComparator(valuePrefix)
      );
      Scan scan = new Scan();
      scan.addColumn(FAMILY_NAME, QUALIFIER_NAME);

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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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      final String name = "testScan";
      byte [] prefix = Bytes.toBytes(name);
      scan.setFilter(new PrefixFilter(prefix));
      scanProto = ProtobufUtil.toScan(scan);
      desScan = ProtobufUtil.toScan(scanProto);
      Filter f = desScan.getFilter();
      assertTrue(f instanceof PrefixFilter);
    }


    assertEquals(scan.getMaxVersions(), desScan.getMaxVersions());
    TimeRange tr = scan.getTimeRange();

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        if (scanner != null) scanner.close();
      }
    }


    protected Scan constructScan(byte[] valuePrefix) throws IOException {
      Filter filter = new SingleColumnValueFilter(
          FAMILY_NAME, QUALIFIER_NAME, CompareFilter.CompareOp.EQUAL,
          new BinaryComparator(valuePrefix)
      );
      Scan scan = new Scan();
      scan.addColumn(FAMILY_NAME, QUALIFIER_NAME);

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      // Check two things:
      // 1. result list contains expected values
      // 2. result list is sorted properly


      Scan scan = new Scan();
      Filter filter = new SingleColumnValueExcludeFilter(cf_essential, col_normal,
                                                         CompareOp.NOT_EQUAL, filtered_val);
      scan.setFilter(filter);
      scan.setLoadColumnFamiliesOnDemand(true);
      InternalScanner s = region.getScanner(scan);

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        region.put(put);
      }


      Scan scan = new Scan();
      scan.setLoadColumnFamiliesOnDemand(true);
      Filter bogusFilter = new FilterBase() {
        @Override
        public boolean isFamilyEssential(byte[] name) {
          return Bytes.equals(name, cf_first);
        }
        @Override

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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);

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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);

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