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, java.nio.ByteBuffer candidate, AbstractType<?> comparator) finds the max column name(s) if comparator is of CompositeType, candidate will be split into its components, and each component is compared to the component on the same place in maxSeen, and then returning the list with the max columns.
static java.util.List<java.nio.ByteBuffer>	mergeMax(java.util.List<java.nio.ByteBuffer> maxColumnNames, java.util.List<java.nio.ByteBuffer> candidates, AbstractType<?> columnNameComparator) if columnNameComparator is CompositeType the columns are compared by components using the subcomparator on the same position.
static java.util.List<java.nio.ByteBuffer>	mergeMin(java.util.List<java.nio.ByteBuffer> minColumnNames, java.util.List<java.nio.ByteBuffer> candidates, AbstractType<?> columnNameComparator) if columnNameComparator is CompositeType the columns are compared by components using the subcomparator on the same position.
static java.util.List<java.nio.ByteBuffer>	minComponents(java.util.List<java.nio.ByteBuffer> minSeen, java.nio.ByteBuffer candidate, AbstractType<?> comparator) finds the min column name(s) if comparator is of CompositeType, candidate will be split into its components, and each component is compared to the component on the same place in minSeen, and then returning the list with the min columns.

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,
                                                java.nio.ByteBuffer candidate,
                                                AbstractType<?> comparator)

finds the max column name(s) if comparator is of CompositeType, candidate will be split into its components, and each component is compared to the component on the same place in maxSeen, and then returning the list with the max columns. will collect at most the number of types in the comparator. if comparator is not CompositeType, maxSeen is assumed to be of size 1 and the item there is compared to the candidate.

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,
                                                java.nio.ByteBuffer candidate,
                                                AbstractType<?> comparator)

finds the min column name(s) if comparator is of CompositeType, candidate will be split into its components, and each component is compared to the component on the same place in minSeen, and then returning the list with the min columns. if comparator is not CompositeType, maxSeen is assumed to be of size 1 and the item there is compared to the candidate.

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,
                                           AbstractType<?> columnNameComparator)

if columnNameComparator is CompositeType the columns are compared by components using the subcomparator on the same position. if comparator is not CompositeType, the lists are assumed to be of max size 1 and compared using the comparator directly.

Parameters:

minColumnNames - lhs

candidates - rhs

columnNameComparator - 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,
                                           AbstractType<?> columnNameComparator)

if columnNameComparator is CompositeType the columns are compared by components using the subcomparator on the same position. if comparator is not CompositeType, the lists are assumed to be of max size 1 and compared using the comparator directly.

Parameters:

maxColumnNames - lhs

candidates - rhs

columnNameComparator - comparator to use

Returns:

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