org.onehippo.cms7.util

Class WeakIdentityMap<K,V>

java.lang.Object

org.onehippo.cms7.util.WeakIdentityMap<K,V>

public final class WeakIdentityMap<K,V>
extends Object

Implements a combination of WeakHashMap and IdentityHashMap. Useful for caches that need to key off of a == comparison instead of a .equals.

This class is not a general-purpose Map implementation! It intentionally violates Map's general contract, which mandates the use of the equals method when comparing objects. This class is designed for use only in the rare cases wherein reference-equality semantics are required.

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
V	get(Object key)
boolean	isEmpty()
static <K,V> WeakIdentityMap<K,V>	newConcurrentHashMap() Creates a new WeakIdentityMap based on a ConcurrentHashMap.
static <K,V> WeakIdentityMap<K,V>	newHashMap() Creates a new WeakIdentityMap based on a non-synchronized HashMap.
V	put(K key, V value)
V	remove(Object key)
int	size()

Methods inherited from class java.lang.Object

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

Method Detail

newHashMap

public static final <K,V> WeakIdentityMap<K,V> newHashMap()

Creates a new WeakIdentityMap based on a non-synchronized HashMap.

newConcurrentHashMap

public static final <K,V> WeakIdentityMap<K,V> newConcurrentHashMap()

Creates a new WeakIdentityMap based on a ConcurrentHashMap.

clear

public void clear()

containsKey

public boolean containsKey(Object key)

get

public V get(Object key)

put

public V put(K key,
             V value)

isEmpty

public boolean isEmpty()

remove

public V remove(Object key)

size

public int size()