com.twelvemonkeys.util

Class WeakWeakMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.WeakHashMap<K,V>

com.twelvemonkeys.util.WeakWeakMap<K,V>

All Implemented Interfaces:

Map<K,V>

public class WeakWeakMap<K,V>
extends WeakHashMap<K,V>

Special-purpose map implementation with weak keys and weak values. This is useful for mapping between keys and values that refer to (for example by wrapping) their keys. For more info, see WeakHashMap on why the values in a WeakHashMap must never refer strongly to their keys.

Version:

$Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/util/WeakWeakMap.java#1 $

Author:

Harald Kuhr

See Also:

WeakHashMap, WeakReference

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Constructor Summary

Constructors

Constructor and Description
WeakWeakMap() Creates a WeakWeakMap with default initial capacity and load factor.
WeakWeakMap(int pInitialCapacity) Creates a WeakWeakMap with the given initial capacity and default load factor.
WeakWeakMap(int pInitialCapacity, float pLoadFactor) Creates a WeakWeakMap with the given initial capacity and load factor.
WeakWeakMap(Map<? extends K,? extends V> pMap) Creates a WeakWeakMap containing the mappings in the given map.

Method Summary

Modifier and Type	Method and Description
boolean	containsValue(Object pValue)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object pKey)
V	put(K pKey, V pValue)
void	putAll(Map<? extends K,? extends V> pMap)
V	remove(Object pKey)
Collection<V>	values()

Methods inherited from class java.util.WeakHashMap

clear, containsKey, forEach, isEmpty, keySet, replaceAll, size

Methods inherited from class java.util.AbstractMap

clone, equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace

Constructor Detail

WeakWeakMap

public WeakWeakMap()

Creates a WeakWeakMap with default initial capacity and load factor.

See Also:

WeakHashMap.WeakHashMap()

WeakWeakMap

public WeakWeakMap(int pInitialCapacity)

Creates a WeakWeakMap with the given initial capacity and default load factor.

Parameters:

pInitialCapacity - the initial capacity

See Also:

WeakHashMap.WeakHashMap(int)

WeakWeakMap

public WeakWeakMap(int pInitialCapacity,
                   float pLoadFactor)

Creates a WeakWeakMap with the given initial capacity and load factor.

Parameters:

pInitialCapacity - the initial capacity

pLoadFactor - the load factor

See Also:

WeakHashMap.WeakHashMap(int, float)

WeakWeakMap

public WeakWeakMap(Map<? extends K,? extends V> pMap)

Creates a WeakWeakMap containing the mappings in the given map.

Parameters:

pMap - the map whose mappings are to be placed in this map.

See Also:

WeakHashMap.WeakHashMap(java.util.Map)

Method Detail

put

public V put(K pKey,
             V pValue)

Specified by:

put in interface Map<K,V>

Overrides:

put in class WeakHashMap<K,V>

get

public V get(Object pKey)

Specified by:

get in interface Map<K,V>

Overrides:

get in class WeakHashMap<K,V>

remove

public V remove(Object pKey)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class WeakHashMap<K,V>

containsValue

public boolean containsValue(Object pValue)

Specified by:

containsValue in interface Map<K,V>

Overrides:

containsValue in class WeakHashMap<K,V>

putAll

public void putAll(Map<? extends K,? extends V> pMap)

Specified by:

putAll in interface Map<K,V>

Overrides:

putAll in class WeakHashMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Overrides:

entrySet in class WeakHashMap<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Overrides:

values in class WeakHashMap<K,V>