Package org.apache.cayenne.util

Class WeakValueMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.apache.cayenne.util.WeakValueMap<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>

public class WeakValueMap<K,V>
extends AbstractMap<K,V>
implements Serializable

Map that stores values wrapped into WeakReference

Since:

4.1

See Also:

• SoftValueMap
• Serialized Form

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>

Field Summary

Fields

Modifier and Type	Field	Description
protected Set<Map.Entry<K,V>>	entrySet	This is a lazily created set of entries that is essentially a view to actual data
protected HashMap<K,WeakReference<V>>	map	This is a main data storage used for most operations
protected ReferenceQueue<V>	referenceQueue

Constructor Summary

Constructors

Constructor	Description
WeakValueMap()
WeakValueMap(int initialCapacity)
WeakValueMap(Map<? extends K,? extends V> m)

Method Summary

Modifier and Type	Method	Description
protected void	checkReferenceQueue()	Cleanup all references collected by GC so far
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
boolean	isEmpty()
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object key)
int	size()
Collection<V>	values()

Methods inherited from class java.util.AbstractMap

clone, equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details

map

protected transient HashMap<K,WeakReference<V>> map

This is a main data storage used for most operations

referenceQueue

protected transient ReferenceQueue<V> referenceQueue

entrySet

protected transient Set<Map.Entry<K,V>> entrySet

This is a lazily created set of entries that is essentially a view to actual data

Constructor Details

WeakValueMap

public WeakValueMap()

WeakValueMap

public WeakValueMap(int initialCapacity)

WeakValueMap

public WeakValueMap(Map<? extends K,? extends V> m)

Method Details

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

Overrides:

isEmpty in class AbstractMap<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class AbstractMap<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

Overrides:

containsValue in class AbstractMap<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

Overrides:

putAll in class AbstractMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

Overrides:

keySet in class AbstractMap<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Overrides:

values in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

checkReferenceQueue

protected void checkReferenceQueue()

Cleanup all references collected by GC so far