com.thoughtworks.xstream.core.util

Class WeakCache

java.lang.Object

java.util.AbstractMap

com.thoughtworks.xstream.core.util.WeakCache

All Implemented Interfaces:

java.util.Map

public class WeakCache
extends java.util.AbstractMap

A HashMap implementation with weak references values and by default for the key. When the value is garbage collected, the key will also vanish from the map.

Since:

1.4

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static interface	WeakCache.Visitor

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>

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map	map

Constructor Summary

Constructors

Constructor and Description
WeakCache() Construct a WeakCache with weak keys.
WeakCache(java.util.Map map) Construct a WeakCache.

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
protected java.lang.ref.Reference	createReference(java.lang.Object value)
java.util.Set	entrySet()
boolean	equals(java.lang.Object o)
java.lang.Object	get(java.lang.Object key)
int	hashCode()
private java.lang.Object	iterate(WeakCache.Visitor visitor, int type)
java.util.Set	keySet()
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

clone, isEmpty, putAll

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 Detail

map

private final java.util.Map map

Constructor Detail

WeakCache

public WeakCache()

Construct a WeakCache with weak keys.

Note, that the internally used WeakHashMap is not thread-safe.

Parameters:

map - the map to use

Since:

1.4

WeakCache

public WeakCache(java.util.Map map)

Construct a WeakCache.

Parameters:

map - the map to use

Since:

1.4

Method Detail

get

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

Specified by:

get in interface java.util.Map

Overrides:

get in class java.util.AbstractMap

put

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

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.AbstractMap

remove

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

Specified by:

remove in interface java.util.Map

Overrides:

remove in class java.util.AbstractMap

createReference

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

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map

Overrides:

containsValue in class java.util.AbstractMap

size

public int size()

Specified by:

size in interface java.util.Map

Overrides:

size in class java.util.AbstractMap

values

public java.util.Collection values()

Specified by:

values in interface java.util.Map

Overrides:

values in class java.util.AbstractMap

entrySet

public java.util.Set entrySet()

Specified by:

entrySet in interface java.util.Map

Specified by:

entrySet in class java.util.AbstractMap

iterate

private java.lang.Object iterate(WeakCache.Visitor visitor,
                                 int type)

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map

Overrides:

containsKey in class java.util.AbstractMap

clear

public void clear()

Specified by:

clear in interface java.util.Map

Overrides:

clear in class java.util.AbstractMap

keySet

public java.util.Set keySet()

Specified by:

keySet in interface java.util.Map

Overrides:

keySet in class java.util.AbstractMap

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map

Overrides:

equals in class java.util.AbstractMap

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map

Overrides:

hashCode in class java.util.AbstractMap

toString

public java.lang.String toString()

Overrides:

toString in class java.util.AbstractMap