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

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*.
static boolean	overlaps(java.util.List<java.nio.ByteBuffer> minColumnNames1, java.util.List<java.nio.ByteBuffer> maxColumnNames1, java.util.List<java.nio.ByteBuffer> minColumnNames2, java.util.List<java.nio.ByteBuffer> maxColumnNames2, CellNameType comparator) Checks if the given min/max column names could overlap (i.e they could share some column names based on the max/min column names in the sstables)

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

overlaps

public static boolean overlaps(java.util.List<java.nio.ByteBuffer> minColumnNames1,
                               java.util.List<java.nio.ByteBuffer> maxColumnNames1,
                               java.util.List<java.nio.ByteBuffer> minColumnNames2,
                               java.util.List<java.nio.ByteBuffer> maxColumnNames2,
                               CellNameType comparator)

Checks if the given min/max column names could overlap (i.e they could share some column names based on the max/min column names in the sstables)