org.jboss.util.collection

Class WeakValueHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.jboss.util.collection.ReferenceValueMap<K,V>

org.jboss.util.collection.ReferenceValueHashMap<K,V>

org.jboss.util.collection.WeakValueHashMap<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Map<K,V>

public class WeakValueHashMap<K,V>
extends ReferenceValueHashMap<K,V>

This Map will remove entries when the value in the map has been cleaned from garbage collection

Author:

Bill Burke, Adrian Brock, Ales Justin

Nested Class Summary

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

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

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
WeakValueHashMap() Constructs a new, empty WeakValueHashMap with the default initial capacity and the default load factor, which is 0.75.
WeakValueHashMap(int initialCapacity) Constructs a new, empty WeakValueHashMap with the given initial capacity and the default load factor, which is 0.75.
WeakValueHashMap(int initialCapacity, float loadFactor) Constructs a new, empty WeakValueHashMap with the given initial capacity and the given load factor.
WeakValueHashMap(Map<K,V> t) Constructs a new WeakValueHashMap with the same mappings as the specified Map.

Method Summary

Methods

Modifier and Type	Method and Description
protected ValueRef<K,V>	create(K key, V value, ReferenceQueue<V> q) Create new value ref instance.

Methods inherited from class org.jboss.util.collection.ReferenceValueHashMap

createMap, createMap, createMap, createMap, createMap

Methods inherited from class org.jboss.util.collection.ReferenceValueMap

clear, containsKey, entrySet, get, put, remove, size, toString

Methods inherited from class java.util.AbstractMap

clone, containsValue, equals, hashCode, isEmpty, keySet, putAll, values

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakValueHashMap

public WeakValueHashMap(int initialCapacity,
                float loadFactor)

Constructs a new, empty WeakValueHashMap with the given initial capacity and the given load factor.

Parameters:

initialCapacity - The initial capacity of the WeakValueHashMap

loadFactor - The load factor of the WeakValueHashMap

Throws:

IllegalArgumentException - If the initial capacity is less than zero, or if the load factor is nonpositive

WeakValueHashMap

public WeakValueHashMap(int initialCapacity)

Constructs a new, empty WeakValueHashMap with the given initial capacity and the default load factor, which is 0.75.

Parameters:

initialCapacity - The initial capacity of the WeakValueHashMap

Throws:

IllegalArgumentException - If the initial capacity is less than zero

WeakValueHashMap

public WeakValueHashMap()

Constructs a new, empty WeakValueHashMap with the default initial capacity and the default load factor, which is 0.75.

WeakValueHashMap

public WeakValueHashMap(Map<K,V> t)

Constructs a new WeakValueHashMap with the same mappings as the specified Map. The WeakValueHashMap is created with an initial capacity of twice the number of mappings in the specified map or 11 (whichever is greater), and a default load factor, which is 0.75.

Parameters:

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

Since:

1.3

Method Detail

create

protected ValueRef<K,V> create(K key,
                   V value,
                   ReferenceQueue<V> q)

Description copied from class: ReferenceValueMap

Create new value ref instance.

Specified by:

create in class ReferenceValueMap<K,V>

Parameters:

key - the key

value - the value

q - the ref queue

Returns:

new value ref instance