org.apache.cassandra.io.sstable
Class IndexHelper

java.lang.Object
  org.apache.cassandra.io.sstable.IndexHelper

public class IndexHelper
extends java.lang.Object

Provides helper to serialize, deserialize and use column indexes.

Nested Class Summary

static class

IndexHelper.IndexInfo

Constructor Summary

IndexHelper()

Method Summary

static BloomFilter	defreezeBloomFilter(java.io.DataInput file) Defreeze the bloom filter.
static java.util.ArrayList<IndexHelper.IndexInfo>	deserializeIndex(FileDataInput in) Deserialize the index into a structure and return it
static java.util.Comparator<IndexHelper.IndexInfo>	getComparator(AbstractType nameComparator)
static int	indexFor(java.nio.ByteBuffer name, java.util.List<IndexHelper.IndexInfo> indexList, AbstractType comparator, boolean reversed) the index of the IndexInfo in which @name will be found.
static void	skipBloomFilter(java.io.DataInput in) Skip the bloom filter
static void	skipIndex(java.io.DataInput file) Skip the index

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IndexHelper

public IndexHelper()

Method Detail

skipBloomFilter

public static void skipBloomFilter(java.io.DataInput in)
                            throws java.io.IOException

Skip the bloom filter

Parameters:

in - the data input from which the bloom filter should be skipped

Throws:

java.io.IOException

skipIndex

public static void skipIndex(java.io.DataInput file)
                      throws java.io.IOException

Skip the index

Parameters:

file - the data input from which the index should be skipped

Throws:

java.io.IOException

deserializeIndex

public static java.util.ArrayList<IndexHelper.IndexInfo> deserializeIndex(FileDataInput in)
                                                                   throws java.io.IOException

Deserialize the index into a structure and return it

Throws:

java.io.IOException

defreezeBloomFilter

public static BloomFilter defreezeBloomFilter(java.io.DataInput file)
                                       throws java.io.IOException

Defreeze the bloom filter.

Returns:

bloom filter summarizing the column information

Throws:

java.io.IOException

indexFor

public static int indexFor(java.nio.ByteBuffer name,
                           java.util.List<IndexHelper.IndexInfo> indexList,
                           AbstractType comparator,
                           boolean reversed)

the index of the IndexInfo in which @name will be found. If the index is @indexList.size(), the @name appears nowhere.

getComparator

public static java.util.Comparator<IndexHelper.IndexInfo> getComparator(AbstractType nameComparator)