com.persistit

Class PersistitMap.ExchangeEntry<K,V>

java.lang.Object

com.persistit.PersistitMap.ExchangeEntry<K,V>

All Implemented Interfaces:

Map.Entry<K,V>

Enclosing class:

PersistitMap<K,V>

public class PersistitMap.ExchangeEntry<K,V>
extends Object
implements Map.Entry<K,V>

Implement java.util.Map.Entry using a backing Persistit tree.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Implements the contract for equals.
K	getKey() Returns the key field of this ExchangeEntry.
V	getValue() Returns the value field of this ExchangeEntry.
int	hashCode() Implements the contract for hashCode.
V	setValue(V value) Modifies the value field of this Entry and of the underlying Persistit database record associated with the key for this Entry.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map.Entry

comparingByKey, comparingByKey, comparingByValue, comparingByValue

Method Detail

getKey

public K getKey()

Returns the key field of this ExchangeEntry.

Specified by:

getKey in interface Map.Entry<K,V>

Returns:

The key

getValue

public V getValue()

Returns the value field of this ExchangeEntry. This is the value that was present in the database at the time an ExchangeIterator created this entry; because other threads may concurrently modify the database, the stored value may have changed.

Specified by:

getValue in interface Map.Entry<K,V>

Returns:

The value associated with this ExchangeEntry

setValue

public V setValue(V value)

Modifies the value field of this Entry and of the underlying Persistit database record associated with the key for this Entry. Returns the former value associated with this entry. This is the value that was present in the database at the time an ExchangeIterator created this entry; because other threads may concurrently modify the database, the stored value may have changed.

Specified by:

setValue in interface Map.Entry<K,V>

Parameters:

value - The new value.

Returns:

The value formerly associated with this ExchangeEntry.

equals

public boolean equals(Object o)

Implements the contract for equals. Two ExchangeEntr instances are equal if their key and value fields are equal.

Specified by:

equals in interface Map.Entry<K,V>

Overrides:

equals in class Object

hashCode

public int hashCode()

Implements the contract for hashCode. The hash code is the XOR of the hashCodes of the key and value fields.

Specified by:

hashCode in interface Map.Entry<K,V>

Overrides:

hashCode in class Object