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


  private void internalPreRead(final ObserverContext<RegionCoprocessorEnvironment> c,
      final Query query) throws IOException {
    TableName tableName = getTableName(c.getEnvironment());
    User activeUser = getActiveUser();
    Filter filter = query.getFilter();
    boolean cellFirstStrategy = query.getACLStrategy();
    // Don't wrap an AccessControlFilter
    if (filter != null && filter instanceof AccessControlFilter) {
      return;
    }
    Filter newFilter = (filter != null)
      ? new FilterList(FilterList.Operator.MUST_PASS_ALL,
          Lists.newArrayList(
            new AccessControlFilter(authManager, activeUser, tableName, cellFirstStrategy),
            filter))
      : new AccessControlFilter(authManager, activeUser, tableName, cellFirstStrategy);

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    try {
      authorizations = scan.getAuthorizations();
    } catch (DeserializationException de) {
      throw new IOException(de);
    }
    Filter visibilityLabelFilter = createVisibilityLabelFilter(region, authorizations);
    if (visibilityLabelFilter != null) {
      Filter filter = scan.getFilter();
      if (filter != null) {
        scan.setFilter(new FilterList(filter, visibilityLabelFilter));
      } else {
        scan.setFilter(visibilityLabelFilter);
      }

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    try {
      authorizations = get.getAuthorizations();
    } catch (DeserializationException de) {
      throw new IOException(de);
    }
    Filter visibilityLabelFilter = createVisibilityLabelFilter(e.getEnvironment().getRegion(),
        authorizations);
    if (visibilityLabelFilter != null) {
      Filter filter = get.getFilter();
      if (filter != null) {
        get.setFilter(new FilterList(filter, visibilityLabelFilter));
      } else {
        get.setFilter(visibilityLabelFilter);
      }

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      if (table.isSystemTable() && !table.equals(LABELS_TABLE_NAME)) {
        return null;
      }
      return new VisibilityLabelFilter(new BitSet(0));
    }
    Filter visibilityLabelFilter = null;
    if (this.scanLabelGenerator != null) {
      List<String> labels = null;
      try {
        labels = this.scanLabelGenerator.getLabels(getActiveUser(), authorizations);
      } catch (Throwable t) {

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  }


  private List<String> getUserAuthsFromLabelsTable(byte[] user) throws IOException {
    Scan s = new Scan();
    s.addColumn(LABELS_TABLE_FAMILY, user);
    Filter filter = createVisibilityLabelFilter(this.regionEnv.getRegion(), new Authorizations(
        SYSTEM_LABEL));
    s.setFilter(filter);
    List<String> auths = new ArrayList<String>();
    // We do ACL check here as we create scanner directly on region. It will not make calls to
    // AccessController CP methods.

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        HTable table = getTable(tableName);
        byte [][] columnsArray = null;
        columnsArray = columns.toArray(new byte[0][]);
        Scan scan = new Scan(startAndPrefix);
        scan.addColumns(columnsArray);
        Filter f = new WhileMatchFilter(
            new PrefixFilter(startAndPrefix));
        scan.setFilter(f);
        return addScanner(table.getScanner(scan));
      } catch (IOException e) {
        throw new IOError(e.getMessage());

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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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      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 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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      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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