ForwardingConcurrentMap (Guava: Google Core Libraries for Java 19.0 API)

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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.

Since:

2.0

Author:

Charles Fry

Nested Class Summary
- Nested classes/interfaces inherited from class com.google.common.collect.ForwardingMap
  ForwardingMap.StandardEntrySet, ForwardingMap.StandardKeySet, ForwardingMap.StandardValues
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K,V>

Constructor Summary

Constructors
Modifier Constructor and Description

protected ForwardingConcurrentMap()
Constructor for use by subclasses.

Method Summary

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

Methods inherited from class com.google.common.collect.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 com.google.common.collect.ForwardingObject
toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map
clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values

- Constructor Detail
  - ForwardingConcurrentMap
```
protected ForwardingConcurrentMap()
```
    Constructor for use by subclasses.
- Method Detail
  - 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
```
public V putIfAbsent(K key,
            V value)
```
    Specified by:
    
    putIfAbsent in interface ConcurrentMap<K,V>
  - remove
```
public boolean remove(Object key,
             Object value)
```
    Specified by:
    
    remove in interface ConcurrentMap<K,V>
  - replace
```
public V replace(K key,
        V value)
```
    Specified by:
    
    replace in interface ConcurrentMap<K,V>
  - replace
```
public boolean replace(K key,
              V oldValue,
              V newValue)
```
    Specified by:
    
    replace in interface ConcurrentMap<K,V>

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