Class ForwardingConcurrentMap<K,V>

java.lang.Object

com.google.common.collect.ForwardingObject

com.google.common.collect.ForwardingMap<K,V>

com.google.common.collect.ForwardingConcurrentMap<K,V>

All Implemented Interfaces:

ConcurrentMap<K,V>, Map<K,V>

@GwtCompatible
public abstract class ForwardingConcurrentMap<K,V>
extends ForwardingMap<K,V>
implements ConcurrentMap<K,V>

A concurrent map which forwards all its method calls to another concurrent map. Subclasses should override one or more methods to modify the behavior of the backing map as desired per the decorator pattern.

default method warning: This class forwards calls to only some default methods. Specifically, it forwards calls only for methods that existed before default methods were introduced. For newer methods, like forEach, it inherits their default implementations. When those implementations invoke methods, they invoke methods on the ForwardingConcurrentMap.

Since:

2.0

Author:

Charles Fry

Nested Class Summary

Nested classes/interfaces inherited from class ForwardingMap

ForwardingMap.StandardEntrySet, ForwardingMap.StandardKeySet, ForwardingMap.StandardValues

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ForwardingConcurrentMap()	Constructor for use by subclasses.

Method Summary

Modifier and Type	Method	Description
protected abstract ConcurrentMap<K,V>	delegate()	Returns the backing delegate instance that methods are forwarded to.
@Nullable V	putIfAbsent(K key, V value)
boolean	remove(@Nullable Object key, @Nullable Object value)
@Nullable V	replace(K key, V value)
boolean	replace(K key, V oldValue, V newValue)

Methods inherited from class ForwardingMap

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, standardClear, standardContainsKey, standardContainsValue, standardEquals, standardHashCode, standardIsEmpty, standardPutAll, standardRemove, standardToString, values

Methods inherited from class ForwardingObject

toString

Methods inherited from class Object

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

Methods inherited from interface ConcurrentMap

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, replaceAll

Methods inherited from interface Map

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Constructor Details

ForwardingConcurrentMap

protected ForwardingConcurrentMap()

Constructor for use by subclasses.

Method Details

delegate

protected abstract ConcurrentMap<K,V> delegate()

Description copied from class: ForwardingObject

Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:

delegate in class ForwardingMap<K,V>

putIfAbsent

@CanIgnoreReturnValue
public @Nullable V putIfAbsent(K key,
 V value)

Specified by:

putIfAbsent in interface ConcurrentMap<K,V>

Specified by:

putIfAbsent in interface Map<K,V>

remove

@CanIgnoreReturnValue
public boolean remove(@Nullable Object key,
 @Nullable Object value)

Specified by:

remove in interface ConcurrentMap<K,V>

Specified by:

remove in interface Map<K,V>

replace

@CanIgnoreReturnValue
public @Nullable V replace(K key,
 V value)

Specified by:

replace in interface ConcurrentMap<K,V>

Specified by:

replace in interface Map<K,V>

replace

@CanIgnoreReturnValue
public boolean replace(K key,
 V oldValue,
 V newValue)

Specified by:

replace in interface ConcurrentMap<K,V>

Specified by:

replace in interface Map<K,V>