org.apache.cassandra.db
Class DecoratedKey<T extends Token>

java.lang.Object
  org.apache.cassandra.db.DecoratedKey<T>

All Implemented Interfaces:

java.lang.Comparable<DecoratedKey>

public class DecoratedKey<T extends Token>
extends java.lang.Object
implements java.lang.Comparable<DecoratedKey>

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).

Field Summary

static java.util.Comparator<DecoratedKey>	comparator
java.nio.ByteBuffer	key
T	token

Constructor Summary

DecoratedKey(T token, java.nio.ByteBuffer key)

Method Summary

int	compareTo(DecoratedKey other)
boolean	equals(java.lang.Object obj)
int	hashCode()
boolean	isEmpty()
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

token

public final T extends Token token

key

public final java.nio.ByteBuffer key

Constructor Detail

DecoratedKey

public DecoratedKey(T 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(DecoratedKey other)

Specified by:

compareTo in interface java.lang.Comparable<DecoratedKey>

isEmpty

public boolean isEmpty()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object