Package org.biojava.utils.cache

Class WeakValueHashMap

java.lang.Object

java.util.AbstractMap

org.biojava.utils.cache.WeakValueHashMap

All Implemented Interfaces:

Map

public class WeakValueHashMap
extends 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

Author:

Thomas Down

Nested Class Summary

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

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

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
WeakValueHashMap()

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(Object o)
Set	entrySet()
Object	get(Object key)
Object	put(Object key, Object value)

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

Methods inherited from interface java.util.Map

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

Constructor Detail

WeakValueHashMap

public WeakValueHashMap()

Method Detail

put

public Object put(Object key,
                  Object value)

Specified by:

put in interface Map

Overrides:

put in class AbstractMap

get

public Object get(Object key)

Specified by:

get in interface Map

Overrides:

get in class AbstractMap

containsKey

public boolean containsKey(Object o)

Specified by:

containsKey in interface Map

Overrides:

containsKey in class AbstractMap

entrySet

public Set entrySet()

Specified by:

entrySet in interface Map

Specified by:

entrySet in class AbstractMap