org.jscience.util.cache
Class WeakValueHashMap

java.lang.Object
  java.util.AbstractMap
      org.jscience.util.cache.WeakValueHashMap

All Implemented Interfaces:

java.util.Map

public class WeakValueHashMap
extends java.util.AbstractMap

Map implementation which keeps weak references to values. Entries are removed from the map when their value is no longer reachable using normal (hard) references. This is useful for maintaining canonical copies of objects without forcing these objects to remain in memory forever.

Note that this is distinct from the standard library class, WeakHashMap which has weak keys.

Since:

1.3

Nested Class Summary

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

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

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

java.util.Map.Entry<K,V>

Constructor Summary

WeakValueHashMap()
Creates a new WeakValueHashMap object.

Method Summary

boolean	containsKey(java.lang.Object o) DOCUMENT ME!
java.util.Set	entrySet() DOCUMENT ME!
java.lang.Object	get(java.lang.Object key) DOCUMENT ME!
java.lang.Object	put(java.lang.Object key, java.lang.Object value) DOCUMENT ME!

Methods inherited from class java.util.AbstractMap

clear, clone, containsValue, equals, hashCode, isEmpty, keySet, putAll, remove, size, toString, values

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakValueHashMap

public WeakValueHashMap()

Creates a new WeakValueHashMap object.

Method Detail

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

DOCUMENT ME!

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.AbstractMap

Parameters:

key - DOCUMENT ME!

value - DOCUMENT ME!

Returns:

DOCUMENT ME!

get

public java.lang.Object get(java.lang.Object key)

DOCUMENT ME!

Specified by:

get in interface java.util.Map

Overrides:

get in class java.util.AbstractMap

Parameters:

key - DOCUMENT ME!

Returns:

DOCUMENT ME!

containsKey

public boolean containsKey(java.lang.Object o)

DOCUMENT ME!

Specified by:

containsKey in interface java.util.Map

Overrides:

containsKey in class java.util.AbstractMap

Parameters:

o - DOCUMENT ME!

Returns:

DOCUMENT ME!

entrySet

public java.util.Set entrySet()

DOCUMENT ME!

Specified by:

entrySet in interface java.util.Map

Specified by:

entrySet in class java.util.AbstractMap

Returns:

DOCUMENT ME!