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

Nested Classes

Modifier and Type	Class and Description
static class	IndexHelper.IndexInfo

Constructor Summary

Constructors

Constructor and Description
IndexHelper()

Method Summary

Methods

Modifier and Type	Method and Description
static java.util.List<IndexHelper.IndexInfo>	deserializeIndex(FileDataInput in, CType type) Deserialize the index into a structure and return it
static java.util.Comparator<IndexHelper.IndexInfo>	getComparator(CType nameComparator, boolean reversed)
static int	indexFor(Composite name, java.util.List<IndexHelper.IndexInfo> indexList, CType comparator, boolean reversed, int lastIndex) The index of the IndexInfo in which a scan starting with @name should begin.
static void	skipBloomFilter(java.io.DataInput in)
static void	skipIndex(java.io.DataInput in) 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

Throws:

java.io.IOException

skipIndex

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

Skip the index

Parameters:

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

Throws:

java.io.IOException - if an I/O error occurs.

deserializeIndex

public static java.util.List<IndexHelper.IndexInfo> deserializeIndex(FileDataInput in,
                                                     CType type)
                                                              throws java.io.IOException

Deserialize the index into a structure and return it

Parameters:

in - input source

type - the comparator type for the column family

Returns:

ArrayList - list of de-serialized indexes

Throws:

java.io.IOException - if an I/O error occurs.

indexFor

public static int indexFor(Composite name,
           java.util.List<IndexHelper.IndexInfo> indexList,
           CType comparator,
           boolean reversed,
           int lastIndex)

The index of the IndexInfo in which a scan starting with @name should begin.

Parameters:

name - name of the index

indexList - list of the indexInfo objects

comparator - comparator type

reversed - is name reversed

Returns:

int index

getComparator

public static java.util.Comparator<IndexHelper.IndexInfo> getComparator(CType nameComparator,
                                                        boolean reversed)