Class WeakCache

java.lang.Object

java.util.AbstractMap

com.thoughtworks.xstream.core.util.WeakCache

All Implemented Interfaces:

Map

public class WeakCache
extends 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	Description
private static interface	WeakCache.Visitor

Nested classes/interfaces inherited from class AbstractMap

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

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
private final Map	map

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
protected Reference	createReference(Object value)
Set	entrySet()
boolean	equals(Object o)
Object	get(Object key)
int	hashCode()
private Object	iterate(WeakCache.Visitor visitor, int type)
Set	keySet()
Object	put(Object key, Object value)
Object	remove(Object key)
int	size()
String	toString()
Collection	values()

Methods inherited from class AbstractMap

clone, isEmpty, putAll

Methods inherited from class Object

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

Methods inherited from interface Map

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

Field Details

map

private final Map map

Constructor Details

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(Map map)

Construct a WeakCache.

Parameters:

map - the map to use

Since:

1.4

Method Details

get

public Object get(Object key)

Specified by:

get in interface Map

Overrides:

get in class AbstractMap

put

public Object put(Object key,
 Object value)

Specified by:

put in interface Map

Overrides:

put in class AbstractMap

remove

public Object remove(Object key)

Specified by:

remove in interface Map

Overrides:

remove in class AbstractMap

createReference

protected Reference createReference(Object value)

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map

Overrides:

containsValue in class AbstractMap

size

public int size()

Specified by:

size in interface Map

Overrides:

size in class AbstractMap

values

public Collection values()

Specified by:

values in interface Map

Overrides:

values in class AbstractMap

entrySet

public Set entrySet()

Specified by:

entrySet in interface Map

Specified by:

entrySet in class AbstractMap

iterate

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

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map

Overrides:

containsKey in class AbstractMap

clear

public void clear()

Specified by:

clear in interface Map

Overrides:

clear in class AbstractMap

keySet

public Set keySet()

Specified by:

keySet in interface Map

Overrides:

keySet in class AbstractMap

equals

public boolean equals(Object o)

Specified by:

equals in interface Map

Overrides:

equals in class AbstractMap

hashCode

public int hashCode()

Specified by:

hashCode in interface Map

Overrides:

hashCode in class AbstractMap

toString

public String toString()

Overrides:

toString in class AbstractMap