org.apache.cassandra.db

Class DecoratedKey

java.lang.Object

org.apache.cassandra.db.DecoratedKey

All Implemented Interfaces:

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

Direct Known Subclasses:

BufferDecoratedKey, NativeDecoratedKey

public abstract class DecoratedKey
extends java.lang.Object
implements 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 interface org.apache.cassandra.db.RowPosition

RowPosition.ForKey, RowPosition.Kind, RowPosition.RowPositionSerializer

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.Comparator<DecoratedKey>	comparator

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

serializer

Constructor Summary

Constructors

Constructor and Description
DecoratedKey(Token token)

Method Summary

Methods

Modifier and Type	Method and Description
static int	compareTo(IPartitioner partitioner, java.nio.ByteBuffer key, RowPosition position)
int	compareTo(RowPosition pos)
boolean	equals(java.lang.Object obj)
abstract java.nio.ByteBuffer	getKey()
Token	getToken()
int	hashCode()
boolean	isMinimum()
boolean	isMinimum(IPartitioner partitioner)
RowPosition.Kind	kind()
java.lang.String	toString()

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

Constructor Detail

DecoratedKey

public DecoratedKey(Token token)

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)

Specified by:

compareTo in interface java.lang.Comparable<RowPosition>

compareTo

public static int compareTo(IPartitioner partitioner,
            java.nio.ByteBuffer key,
            RowPosition position)

isMinimum

public boolean isMinimum(IPartitioner partitioner)

Specified by:

isMinimum in interface RingPosition<RowPosition>

isMinimum

public boolean isMinimum()

Specified by:

isMinimum in interface RowPosition

kind

public RowPosition.Kind kind()

Specified by:

kind in interface 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>

getKey

public abstract java.nio.ByteBuffer getKey()