EDU.oswego.cs.dl.util.concurrent

Class ConcurrentHashMap.Entry

java.lang.Object

EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap.Entry

All Implemented Interfaces:

java.util.Map.Entry

Enclosing class:

ConcurrentHashMap

protected static class ConcurrentHashMap.Entry
extends java.lang.Object
implements java.util.Map.Entry

ConcurrentHashMap collision list entry.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	hash
protected java.lang.Object	key
protected ConcurrentHashMap.Entry	next
protected java.lang.Object	value

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
java.lang.Object	getKey()
java.lang.Object	getValue() Get the value.
int	hashCode()
java.lang.Object	setValue(java.lang.Object value) Set the value of this entry.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map.Entry

comparingByKey, comparingByKey, comparingByValue, comparingByValue

Field Detail

key

protected final java.lang.Object key

value

protected volatile java.lang.Object value

hash

protected final int hash

next

protected final ConcurrentHashMap.Entry next

Method Detail

getKey

public java.lang.Object getKey()

Specified by:

getKey in interface java.util.Map.Entry

getValue

public java.lang.Object getValue()

Get the value. Note: In an entrySet or entrySet.iterator, unless you can guarantee lack of concurrent modification, getValue might return null, reflecting the fact that the entry has been concurrently removed. However, there are no assurances that concurrent removals will be reflected using this method.

Specified by:

getValue in interface java.util.Map.Entry

Returns:

the current value, or null if the entry has been detectably removed.

setValue

public java.lang.Object setValue(java.lang.Object value)

Set the value of this entry. Note: In an entrySet or entrySet.iterator), unless you can guarantee lack of concurrent modification, setValue is not strictly guaranteed to actually replace the value field obtained via the get operation of the underlying hash table in multithreaded applications. If iterator-wide synchronization is not used, and any other concurrent put or remove operations occur, sometimes even to other entries, then this change is not guaranteed to be reflected in the hash table. (It might, or it might not. There are no assurances either way.)

Specified by:

setValue in interface java.util.Map.Entry

Parameters:

value - the new value.

Returns:

the previous value, or null if entry has been detectably removed.

Throws:

java.lang.NullPointerException - if the value is null.

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map.Entry

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map.Entry

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object