org.apache.cassandra.db.rows

Class AbstractCell

java.lang.Object

org.apache.cassandra.db.rows.ColumnData

org.apache.cassandra.db.rows.Cell

org.apache.cassandra.db.rows.AbstractCell

Direct Known Subclasses:

BufferCell, NativeCell

public abstract class AbstractCell
extends Cell

Base abstract class for Cell implementations. Unless you have a very good reason not to, every cell implementation should probably extend this class.

Field Summary

Fields inherited from class org.apache.cassandra.db.rows.Cell

comparator, NO_DELETION_TIME, NO_TTL, serializer

Fields inherited from class org.apache.cassandra.db.rows.ColumnData

column

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractCell(ColumnDefinition column)

Method Summary

Modifier and Type	Method and Description
Cell	copy(AbstractAllocator allocator)
int	dataSize() The size of the data hold by this ColumnData.
void	digest(java.security.MessageDigest digest) Adds the data to the provided digest.
boolean	equals(java.lang.Object other)
int	hashCode()
boolean	isCounterCell() Whether the cell is a counter cell or not.
boolean	isExpiring() Whether the cell is an expiring one or not.
boolean	isLive(int nowInSec) Whether the cell is live or not given the current time.
boolean	isTombstone() Whether the cell is a tombstone or not.
Cell	markCounterLocalToBeCleared()
long	maxTimestamp()
Cell	purge(DeletionPurger purger, int nowInSec)
java.lang.String	toString()
Cell	updateAllTimestamp(long newTimestamp) Returns a copy of the data where all timestamps for live data have replaced by newTimestamp and all deletion timestamp by newTimestamp - 1.
void	validate() Validate the column data.

Methods inherited from class org.apache.cassandra.db.rows.Cell

localDeletionTime, path, timestamp, ttl, value, withUpdatedColumn, withUpdatedValue

Methods inherited from class org.apache.cassandra.db.rows.ColumnData

column, unsharedHeapSizeExcludingData

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

AbstractCell

protected AbstractCell(ColumnDefinition column)

Method Detail

isCounterCell

public boolean isCounterCell()

Description copied from class: Cell

Whether the cell is a counter cell or not.

Specified by:

isCounterCell in class Cell

Returns:

whether the cell is a counter cell or not.

isLive

public boolean isLive(int nowInSec)

Description copied from class: Cell

Whether the cell is live or not given the current time.

Specified by:

isLive in class Cell

Parameters:

nowInSec - the current time in seconds. This is used to decide if an expiring cell is expired or live.

Returns:

whether the cell is live or not at nowInSec.

isTombstone

public boolean isTombstone()

Description copied from class: Cell

Whether the cell is a tombstone or not.

Specified by:

isTombstone in class Cell

Returns:

whether the cell is a tombstone or not.

isExpiring

public boolean isExpiring()

Description copied from class: Cell

Whether the cell is an expiring one or not.

Note that this only correspond to whether the cell liveness info have a TTL or not, but doesn't tells whether the cell is already expired or not. You should use Cell.isLive(int) for that latter information.

Specified by:

isExpiring in class Cell

Returns:

whether the cell is an expiring one or not.

markCounterLocalToBeCleared

public Cell markCounterLocalToBeCleared()

Specified by:

markCounterLocalToBeCleared in class Cell

purge

public Cell purge(DeletionPurger purger,
                  int nowInSec)

Specified by:

purge in class Cell

copy

public Cell copy(AbstractAllocator allocator)

Specified by:

copy in class Cell

updateAllTimestamp

public Cell updateAllTimestamp(long newTimestamp)

Description copied from class: ColumnData

Returns a copy of the data where all timestamps for live data have replaced by newTimestamp and all deletion timestamp by newTimestamp - 1. This exists for the Paxos path, see PartitionUpdate.updateAllTimestamp(long) for additional details.

Specified by:

updateAllTimestamp in class ColumnData

dataSize

public int dataSize()

Description copied from class: ColumnData

The size of the data hold by this ColumnData.

Specified by:

dataSize in class ColumnData

Returns:

the size used by the data of this ColumnData.

digest

public void digest(java.security.MessageDigest digest)

Description copied from class: ColumnData

Adds the data to the provided digest.

Specified by:

digest in class ColumnData

Parameters:

digest - the MessageDigest to add the data to.

validate

public void validate()

Description copied from class: ColumnData

Validate the column data.

Specified by:

validate in class ColumnData

maxTimestamp

public long maxTimestamp()

Specified by:

maxTimestamp in class ColumnData

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object