public final Class WeakCache<K, V>

Class Inheritance

extends Object

java.lang.Object
com.sun.beans.WeakCache

Imports

java.lang.ref.Reference, .WeakReference, java.util.Map, .WeakHashMap

A hashtable-based cache with weak keys and weak values. An entry in the map will be automatically removed when its key is no longer in the ordinary use. A value will be automatically removed as well when it is no longer in the ordinary use.

Author: Sergey A. Malenkov
Since: 1.7

Field Summary

Modifier and Type	Field and Description
private final Map<K, Reference<V>>	map

Constructor Summary

Access	Constructor and Description
public	WeakCache()

Method Summary

Modifier and Type	Method and Description
public void	clear() Removes all of the mappings from this cache.
public V	Returns: a value to which the specified `key` is mapped get(K the key whose associated value is returned key) Returns a value to which the specified `key` is mapped, or `null` if this map contains no mapping for the `key`.
public void	put(K the key with which the specified value is associated key, V the value to be associated with the specified key value) Associates the specified `value` with the specified `key`.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

map	back to summary
private final Map<K, Reference<V>> map

Constructor Detail

WeakCache	back to summary
public WeakCache()

Method Detail

clear	back to summary
public void clear() Removes all of the mappings from this cache.

get back to summary

get	back to summary
public V get(K key) Returns a value to which the specified `key` is mapped, or `null` if this map contains no mapping for the `key`. Parameters key:K the key whose associated value is returned Returns:V a value to which the specified `key` is mapped

public V get(K key)

Returns a value to which the specified key is mapped, or null if this map contains no mapping for the key.

Parameters

key:K: the key whose associated value is returned

Returns:V

a value to which the specified key is mapped

put back to summary

put	back to summary
public void put(K key, V value) Associates the specified `value` with the specified `key`. Removes the mapping for the specified `key` from this cache if it is present and the specified `value` is `null`. If the cache previously contained a mapping for the `key`, the old value is replaced by the specified `value`. Parameters key:K the key with which the specified value is associated value:V the value to be associated with the specified key

public void put(K key, V value)

Associates the specified value with the specified key. Removes the mapping for the specified key from this cache if it is present and the specified value is null. If the cache previously contained a mapping for the key, the old value is replaced by the specified value.

Parameters

key:K: the key with which the specified value is associated
value:V: the value to be associated with the specified key