org.apache.cassandra.io.sstable

Class ColumnNameHelper

java.lang.Object

org.apache.cassandra.io.sstable.ColumnNameHelper

public class ColumnNameHelper
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
ColumnNameHelper()

Method Summary

Methods

Modifier and Type	Method and Description
static java.util.List<java.nio.ByteBuffer>	maxComponents(java.util.List<java.nio.ByteBuffer> maxSeen, Composite candidate, CellNameType comparator) finds the max cell name component(s) Note that this method *can modify maxSeen*.
static java.util.List<java.nio.ByteBuffer>	mergeMax(java.util.List<java.nio.ByteBuffer> maxColumnNames, java.util.List<java.nio.ByteBuffer> candidates, CellNameType comparator) Merge 2 lists of max cell name components.
static java.util.List<java.nio.ByteBuffer>	mergeMin(java.util.List<java.nio.ByteBuffer> minColumnNames, java.util.List<java.nio.ByteBuffer> candidates, CellNameType comparator) Merge 2 lists of min cell name components.
static java.util.List<java.nio.ByteBuffer>	minComponents(java.util.List<java.nio.ByteBuffer> minSeen, Composite candidate, CellNameType comparator) finds the min cell name component(s) Note that this method *can modify maxSeen*.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnNameHelper

public ColumnNameHelper()

Method Detail

maxComponents

public static java.util.List<java.nio.ByteBuffer> maxComponents(java.util.List<java.nio.ByteBuffer> maxSeen,
                                                Composite candidate,
                                                CellNameType comparator)

finds the max cell name component(s) Note that this method *can modify maxSeen*.

Parameters:

maxSeen - the max columns seen so far

candidate - the candidate column(s)

comparator - the comparator to use

Returns:

a list with the max column(s)

minComponents

public static java.util.List<java.nio.ByteBuffer> minComponents(java.util.List<java.nio.ByteBuffer> minSeen,
                                                Composite candidate,
                                                CellNameType comparator)

finds the min cell name component(s) Note that this method *can modify maxSeen*.

Parameters:

minSeen - the max columns seen so far

candidate - the candidate column(s)

comparator - the comparator to use

Returns:

a list with the min column(s)

mergeMin

public static java.util.List<java.nio.ByteBuffer> mergeMin(java.util.List<java.nio.ByteBuffer> minColumnNames,
                                           java.util.List<java.nio.ByteBuffer> candidates,
                                           CellNameType comparator)

Merge 2 lists of min cell name components.

Parameters:

minColumnNames - lhs

candidates - rhs

comparator - comparator to use

Returns:

a list with smallest column names according to (sub)comparator

mergeMax

public static java.util.List<java.nio.ByteBuffer> mergeMax(java.util.List<java.nio.ByteBuffer> maxColumnNames,
                                           java.util.List<java.nio.ByteBuffer> candidates,
                                           CellNameType comparator)

Merge 2 lists of max cell name components.

Parameters:

maxColumnNames - lhs

candidates - rhs

comparator - comparator to use

Returns:

a list with biggest column names according to (sub)comparator