com.triactive.jdo.util
Class WeakValueMap

java.lang.Object
  java.util.AbstractMap
      com.triactive.jdo.util.ReferenceValueMap
          com.triactive.jdo.util.WeakValueMap

All Implemented Interfaces:

java.util.Map

public class WeakValueMap

extends com.triactive.jdo.util.ReferenceValueMap

A java.util.Map implementation with weak values.

The values are stored in the map as weak references. If the garbage collector clears the reference, the corresponding key is automatically removed from the map.

Author:

Mike Martin

See Also:

WeakReference

Nested Class Summary

Nested classes inherited from class java.util.Map

java.util.Map.Entry

Field Summary

protected java.lang.ref.ReferenceQueue

refQueue

Constructor Summary

WeakValueMap()

WeakValueMap(int initialCapacity)

WeakValueMap(int initialCapacity, float loadFactor)

WeakValueMap(java.util.Map m)

Method Summary

boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
java.util.Set	entrySet()
boolean	equals(java.lang.Object o)
java.lang.Object	get(java.lang.Object key)
int	hashCode()
boolean	isEmpty()
java.util.Set	keySet()
protected java.lang.ref.Reference	newReference(java.lang.Object value) Returns a new Reference object to be inserted into the map.
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
java.lang.Object	remove(java.lang.Object key)
int	size()
java.lang.String	toString()
java.util.Collection	values()

Methods inherited from class java.util.AbstractMap

clear, clone, putAll

Methods inherited from class java.lang.Object

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

Field Detail

refQueue

protected final java.lang.ref.ReferenceQueue refQueue

Constructor Detail

WeakValueMap

public WeakValueMap()

WeakValueMap

public WeakValueMap(int initialCapacity)

WeakValueMap

public WeakValueMap(int initialCapacity,
                    float loadFactor)

WeakValueMap

public WeakValueMap(java.util.Map m)

Method Detail

newReference

protected java.lang.ref.Reference newReference(java.lang.Object value)

Description copied from class: com.triactive.jdo.util.ReferenceValueMap

Returns a new Reference object to be inserted into the map. Subclasses must implement this method to construct Reference objects of the desired type (e.g. SoftReference, etc.).

Parameters:

value - The associated value to be referenced.

Returns:

A new Reference object to be inserted into the map.

put

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

get

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

size

public int size()

isEmpty

public boolean isEmpty()

containsKey

public boolean containsKey(java.lang.Object key)

containsValue

public boolean containsValue(java.lang.Object value)

keySet

public java.util.Set keySet()

values

public java.util.Collection values()

entrySet

public java.util.Set entrySet()

remove

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

hashCode

public int hashCode()

equals

public boolean equals(java.lang.Object o)

toString

public java.lang.String toString()