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.

        ByteBuffer super_column = null;
        if (scLength > 0)
            super_column = ByteBuffer.wrap(readBuf(scLength, dis));


        TDeserializer dser = new TDeserializer(new TBinaryProtocol.Factory());
        SlicePredicate pred = new SlicePredicate();
        FBUtilities.deserialize(dser, pred, dis);


        AbstractBounds range = AbstractBounds.serializer().deserialize(dis);
        int max_keys = dis.readInt();
        return new RangeSliceCommand(keyspace, column_family, super_column, pred, range, max_keys);

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    private void testRangeSliceCommandWrite() throws IOException
    {
        ByteBuffer startCol = ByteBufferUtil.bytes("Start");
        ByteBuffer stopCol = ByteBufferUtil.bytes("Stop");
        ByteBuffer emptyCol = ByteBufferUtil.bytes("");
        SlicePredicate namesPred = new SlicePredicate();
        namesPred.column_names = Statics.NamedCols;
        SliceRange emptySliceRange = new SliceRange(emptyCol, emptyCol, false, 100); 
        SliceRange nonEmptySliceRange = new SliceRange(startCol, stopCol, true, 100);
        SlicePredicate emptyRangePred = new SlicePredicate();
        emptyRangePred.slice_range = emptySliceRange;
        SlicePredicate nonEmptyRangePred = new SlicePredicate();
        nonEmptyRangePred.slice_range = nonEmptySliceRange;
        IPartitioner part = StorageService.getPartitioner();
        AbstractBounds bounds = new Range(part.getRandomToken(), part.getRandomToken());
        
        Message namesCmd = new RangeSliceCommand(Statics.KS, "Standard1", null, namesPred, bounds, 100).getMessage();

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  public <SN, N, V> Mutator<K> addSubDelete(K key, String cf, HSuperColumn<SN, N, V> sc, long clock)
  {
    Deletion d = new Deletion().setTimestamp(clock);


    if (sc.getColumns() != null) {
      SlicePredicate pred = new SlicePredicate();
      for (HColumn<N, V> col : sc.getColumns()) {
        pred.addToColumn_names(col.getNameSerializer().toByteBuffer(
            col.getName()));
      }
      d.setPredicate(pred);
    }

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  @Override
  public <N> Mutator<K> addDeletion(K key, String cf, N columnName,
      Serializer<N> nameSerializer, long clock) {
    Deletion d;
    if (columnName != null) {
      SlicePredicate sp = new SlicePredicate();
      sp.addToColumn_names(nameSerializer.toByteBuffer(columnName));
      d = new Deletion().setTimestamp(clock).setPredicate(sp);
    } else {
      d = new Deletion().setTimestamp(clock);
    }
    getPendingMutations().addDeletion(key, Arrays.asList(cf), d);

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  @Override
  public <N> Mutator<K> addCounterDeletion(K key, String cf,
      N counterColumnName, Serializer<N> nameSerializer) {
    Deletion d;
    if (counterColumnName != null) {
      SlicePredicate sp = new SlicePredicate();
      sp.addToColumn_names(nameSerializer.toByteBuffer(counterColumnName));
      d = new Deletion().setPredicate(sp);
    } else {
      d = new Deletion();
    }
    getPendingMutations().addDeletion(key, Arrays.asList(cf), d);

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  @Override
  public <SN, N> Mutator<K> addCounterSubDeletion(K key, String cf,
      HCounterSuperColumn<SN, N> sc) {
    Deletion d = new Deletion();
    if (sc.getColumns() != null) {
      SlicePredicate pred = new SlicePredicate();
      for (HCounterColumn<N> col : sc.getColumns()) {
        pred.addToColumn_names(col.getNameSerializer().toByteBuffer(
            col.getName()));
      }
      d.setPredicate(pred);
    }
    d.setSuper_column(sc.getNameByteBuffer());

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  @Override
  public <SN, N> Mutator<K> addSubDelete(K key, String cf, SN sColumnName,
      N columnName, Serializer<SN> sNameSerializer,
      Serializer<N> nameSerializer, long clock) {
    Deletion d = new Deletion().setTimestamp(clock);
    SlicePredicate predicate = new SlicePredicate();
    predicate.addToColumn_names(nameSerializer.toByteBuffer(columnName));
    d.setPredicate(predicate);
    d.setSuper_column(sNameSerializer.toByteBuffer(sColumnName));
    getPendingMutations().addDeletion(key, Arrays.asList(cf), d);
    return this;
  }

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    sliceRange.setStart(new byte[0]);
    sliceRange.setFinish(new byte[0]);
    sliceRange.setCount(columnCount + 1);
    
    
    SlicePredicate slicePredicate = new SlicePredicate();
    slicePredicate.setSlice_range(sliceRange);
    
    // Set row range from request
    KeyRange range = new KeyRange(count + 1);
    if (start.length() > 0) {
      range.setStart_key(Hex.decodeHex(start.toCharArray()));

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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(ByteBufferUtil.bytes(columnName)));
            ConfigHelper.setInputSlicePredicate(job.getConfiguration(), predicate);


            job.waitForCompletion(true);
        }
        return 0;

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    private void testRangeSliceCommandWrite() throws IOException
    {
        ByteBuffer startCol = ByteBufferUtil.bytes("Start");
        ByteBuffer stopCol = ByteBufferUtil.bytes("Stop");
        ByteBuffer emptyCol = ByteBufferUtil.bytes("");
        SlicePredicate namesPred = new SlicePredicate();
        namesPred.column_names = Statics.NamedCols;
        SliceRange emptySliceRange = new SliceRange(emptyCol, emptyCol, false, 100); 
        SliceRange nonEmptySliceRange = new SliceRange(startCol, stopCol, true, 100);
        SlicePredicate emptyRangePred = new SlicePredicate();
        emptyRangePred.slice_range = emptySliceRange;
        SlicePredicate nonEmptyRangePred = new SlicePredicate();
        nonEmptyRangePred.slice_range = nonEmptySliceRange;
        IPartitioner part = StorageService.getPartitioner();
        AbstractBounds<RowPosition> bounds = new Range<Token>(part.getRandomToken(), part.getRandomToken()).toRowBounds();
        
        Message namesCmd = new RangeSliceCommand(Statics.KS, "Standard1", null, namesPred, bounds, 100).getMessage(MessagingService.version_);

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