org.h2.util

Class SoftHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.h2.util.SoftHashMap<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Map<K,V>

public class SoftHashMap<K,V>
extends AbstractMap<K,V>

Map which stores items using SoftReference. Items can be garbage collected and removed. It is not a general purpose cache, as it doesn't implement some methods, and others not according to the map definition, to improve speed.

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>

Constructor Summary

Constructors

Constructor and Description
SoftHashMap()

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
V	put(K key, V value) Store the object.
V	remove(Object key) Remove an object.

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, hashCode, isEmpty, keySet, putAll, size, toString, values

Methods inherited from class java.lang.Object

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

Constructor Detail

SoftHashMap

public SoftHashMap()

Method Detail

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)

Store the object. The return value of this method is null or a SoftReference.

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

Parameters:

key - the key

value - the value

Returns:

null or the old object.

remove

public V remove(Object key)

Remove an object.

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

Parameters:

key - the key

Returns:

null or the old object

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear 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>