Examples of org.apache.cassandra.thrift.SlicePredicate

org.apache.cassandra.thrift.SlicePredicate
kipedia.org/wiki/Predicate_(mathematical_logic)), which is described as "a property that the elements of a set have in common." SlicePredicate's in Cassandra are described with either a list of column_names or a SliceRange. If column_names is specified, slice_range is ignored. @param column_name. A list of column names to retrieve. This can be used similar to Memcached's "multi-get" featureto fetch N known column names. For instance, if you know you wish to fetch columns 'Joe', 'Jack', and 'Jim' you can pass those column names as a list to fetch all three at once. @param slice_range. A SliceRange describing how to range, order, and/or limit the slice.

  /**
   * {@inheritDoc}
   */
  @Override
  public <N> Mutator<K> addDeletion(K key, String cf, N columnName, Serializer<N> nameSerializer, long clock) {
    SlicePredicate sp = new SlicePredicate();
    sp.addToColumn_names(nameSerializer.toByteBuffer(columnName));
    Deletion d = columnName != null ? new Deletion(clock).setPredicate(sp) : new Deletion(clock);
    getPendingMutations().addDeletion(key, Arrays.asList(cf), d);
    return this;
  }

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  @Test
  public void testGetSetPredicate_columnNames() {
    ConcreteSliceQueury<String, String, String, Rows<String, String, String>> q =
      new ConcreteSliceQueury<String, String, String, Rows<String, String,String>>(ko, se, se, se);
    q.setColumnNames("1", "2", "3");
    SlicePredicate p = q.getPredicate();
    assertEquals(3, p.getColumn_names().size());
    assertNull(p.getSlice_range());
  }

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  @Test
  public void testGetSetPredicate_range() {
    ConcreteSliceQueury<String, String, String, Rows<String, String, String>> q =
      new ConcreteSliceQueury<String, String, String, Rows<String, String,String>>(ko, se, se, se);
    q.setRange("1", "100", false, 10);
    SlicePredicate p = q.getPredicate();
    assertNull(p.getColumn_names());
    SliceRange range = p.getSlice_range();
    assertNotNull(range);
    assertArrayEquals(bytes("1"), range.getStart());
    assertArrayEquals(bytes("100"), range.getFinish());
    assertEquals(10, range.getCount());
  }

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      @Override
      public SuperColumn execute(Cassandra.Client cassandra) throws HectorException {
        ColumnParent clp = new ColumnParent(columnPath.getColumn_family());
        clp.setSuper_column(columnPath.getSuper_column());


        SlicePredicate sp = new SlicePredicate();
        sp.setSlice_range(sliceRange);


        try {
          List<ColumnOrSuperColumn> cosc = cassandra.get_slice(key, clp, sp,
              getThriftCl(OperationType.READ));
          if (cosc == null || cosc.isEmpty()) {

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    // only can get supercolumn by multigetSuperSlice
    ColumnParent clp = new ColumnParent(columnPath.getColumn_family());
    clp.setSuper_column(columnPath.getSuper_column());


    SliceRange sr = new SliceRange(ByteBuffer.wrap(new byte[0]), ByteBuffer.wrap(new byte[0]), reversed, size);
    SlicePredicate sp = new SlicePredicate();
    sp.setSlice_range(sr);


    Map<ByteBuffer, List<SuperColumn>> sclist = multigetSuperSlice(keys, clp, sp);


    if (sclist == null || sclist.isEmpty()) {
      return Collections.emptyMap();

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  /**
   * Will throw a runtime exception if neither columnsNames nor count were set.
   * @return
   */
  public SlicePredicate toThrift() {
    SlicePredicate pred = new SlicePredicate();


    switch (predicateType) {
    case ColumnNames:
      if (columnNames == null ) {
        return null;
      }
      pred.setColumn_names(toThriftColumnNames(columnNames));
      break;
    case Range:
      Assert.isTrue(countSet, "Count was not set, neither were column-names set, can't execute");
      SliceRange range = new SliceRange(findBytes(start), findBytes(finish), reversed, count);
      pred.setSlice_range(range);
      break;
    case Unknown:
    default:
      throw new HectorException(
          "Neither column names nor range were set, this is an invalid slice predicate");

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    private static SlicePredicate predicateFromString(String st)
    {
        assert st != null;
        TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
        SlicePredicate predicate = new SlicePredicate();
        try
        {
            deserializer.deserialize(predicate, FBUtilities.hexToBytes(st));
        }
        catch (TException e)

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            ConfigHelper.setRpcPort(job.getConfiguration(), "9160");
            ConfigHelper.setInitialAddress(job.getConfiguration(), "localhost");
            ConfigHelper.setPartitioner(job.getConfiguration(), "org.apache.cassandra.dht.RandomPartitioner");
            ConfigHelper.setInputColumnFamily(job.getConfiguration(), KEYSPACE, COLUMN_FAMILY);
            SlicePredicate predicate = new SlicePredicate().setColumn_names(Arrays.asList(ByteBuffer.wrap(columnName.getBytes())));
            ConfigHelper.setInputSlicePredicate(job.getConfiguration(), predicate);


            job.waitForCompletion(true);
        }
        return 0;

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    private static SlicePredicate predicateFromString(String st)
    {
        assert st != null;
        TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
        SlicePredicate predicate = new SlicePredicate();
        try
        {
            deserializer.deserialize(predicate, FBUtilities.hexToBytes(st));
        }
        catch (TException e)

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            throw new IOException("Expected 'cassandra://<keyspace>/<columnfamily>': " + e.getMessage());
        }


        // and configure
        SliceRange range = new SliceRange(BOUND, BOUND, false, LIMIT);
        SlicePredicate predicate = new SlicePredicate().setSlice_range(range);
        conf = job.getConfiguration();
        ConfigHelper.setInputSlicePredicate(conf, predicate);
        ConfigHelper.setInputColumnFamily(conf, ksname, cfname);


        // check the environment for connection information

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