org.apache.cassandra.db

Class DecoratedKey

java.lang.Object

org.apache.cassandra.db.RowPosition

org.apache.cassandra.db.DecoratedKey

All Implemented Interfaces:

java.lang.Comparable<RowPosition>, RingPosition<RowPosition>

public class DecoratedKey
extends RowPosition

Represents a decorated key, handy for certain operations where just working with strings gets slow. We do a lot of sorting of DecoratedKeys, so for speed, we assume that tokens correspond one-to-one with keys. This is not quite correct in the case of RandomPartitioner (which uses MD5 to hash keys to tokens); if this matters, you can subclass RP to use a stronger hash, or use a non-lossy tokenization scheme (as in the OrderPreservingPartitioner classes).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.db.RowPosition

RowPosition.Kind, RowPosition.RowPositionSerializer

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.Comparator<DecoratedKey>	comparator
java.nio.ByteBuffer	key
Token	token

Fields inherited from class org.apache.cassandra.db.RowPosition

serializer

Constructor Summary

Constructors

Constructor and Description
DecoratedKey(Token token, java.nio.ByteBuffer key)

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(RowPosition pos)
boolean	equals(java.lang.Object obj)
Token	getToken()
int	hashCode()
boolean	isMinimum(IPartitioner partitioner)
RowPosition.Kind	kind()
java.lang.String	toString()

Methods inherited from class org.apache.cassandra.db.RowPosition

forKey, isMinimum

Methods inherited from class java.lang.Object

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

Field Detail

comparator

public static final java.util.Comparator<DecoratedKey> comparator

token

public final Token token

key

public final java.nio.ByteBuffer key

Constructor Detail

DecoratedKey

public DecoratedKey(Token token,
            java.nio.ByteBuffer key)

Method Detail

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

compareTo

public int compareTo(RowPosition pos)

isMinimum

public boolean isMinimum(IPartitioner partitioner)

kind

public RowPosition.Kind kind()

Specified by:

kind in class RowPosition

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getToken

public Token getToken()

Specified by:

getToken in interface RingPosition<RowPosition>

Specified by:

getToken in class RowPosition