java.lang.Object
- com.google.common.collect.ForwardingObject
- - com.google.common.collect.ForwardingMapEntry<K,V>

All Implemented Interfaces:

java.util.Map.Entry<K,V>
```
@GwtCompatible
public abstract class ForwardingMapEntry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>
extends ForwardingObject
implements java.util.Map.Entry<K,V>
```
A map entry which forwards all its method calls to another map entry. Subclasses should override one or more methods to modify the behavior of the backing map entry as desired per the decorator pattern.
Warning: The methods of ForwardingMapEntry forward indiscriminately to the methods of the delegate. For example, overriding getValue() alone will not change the behavior of equals(java.lang.Object), which can lead to unexpected behavior. In this case, you should override equals as well, either providing your own implementation, or delegating to the provided standardEquals method.
Each of the standard methods, where appropriate, use Objects.equal(java.lang.Object, java.lang.Object) to test equality for both keys and values. This may not be the desired behavior for map implementations that use non-standard notions of key equality, such as the entry of a SortedMap whose comparator is not consistent with equals.
The standard methods are not guaranteed to be thread-safe, even when all of the methods that they depend on are thread-safe.

Since:

2.0

Author:

Mike Bostock, Louis Wasserman

Constructor Summary

Constructors
Modifier Constructor Description

protected ForwardingMapEntry()
Constructor for use by subclasses.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract java.util.Map.Entry<K,V>`	`delegate()`	Returns the backing delegate instance that methods are forwarded to.
`boolean`	`equals(java.lang.Object object)`
`K`	`getKey()`
`V`	`getValue()`
`int`	`hashCode()`
`V`	`setValue(V value)`
`protected boolean`	`standardEquals(java.lang.Object object)`	A sensible definition of `equals(Object)` in terms of `getKey()` and `getValue()`.
`protected int`	`standardHashCode()`	A sensible definition of `hashCode()` in terms of `getKey()` and `getValue()`.
`protected java.lang.String`	`standardToString()`	A sensible definition of `ForwardingObject.toString()` in terms of `getKey()` and `getValue()`.

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

- Constructor Detail
  - ForwardingMapEntry
```
protected ForwardingMapEntry()
```
    Constructor for use by subclasses.
- Method Detail
  - delegate
```
protected abstract java.util.Map.Entry<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 ForwardingObject
  - getKey
```
public K getKey()
```
    Specified by:
    
    getKey in interface java.util.Map.Entry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>
  - getValue
```
public V getValue()
```
    Specified by:
    
    getValue in interface java.util.Map.Entry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>
  - setValue
```
public V setValue(V value)
```
    Specified by:
    
    setValue in interface java.util.Map.Entry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>
  - equals
```
public boolean equals(@CheckForNull
                      java.lang.Object object)
```
    Specified by:
    
    equals in interface java.util.Map.Entry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>
    
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface java.util.Map.Entry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>
    
    Overrides:
    
    hashCode in class java.lang.Object
  - standardEquals
```
protected boolean standardEquals(@CheckForNull
                                 java.lang.Object object)
```
    A sensible definition of equals(Object) in terms of getKey() and getValue(). If you override either of these methods, you may wish to override equals(Object) to forward to this implementation.
    
    Since:
    
    7.0
  - standardHashCode
```
protected int standardHashCode()
```
    A sensible definition of hashCode() in terms of getKey() and getValue(). If you override either of these methods, you may wish to override hashCode() to forward to this implementation.
    
    Since:
    
    7.0
  - standardToString
```
protected java.lang.String standardToString()
```
    A sensible definition of ForwardingObject.toString() in terms of getKey() and getValue(). If you override either of these methods, you may wish to override equals(java.lang.Object) to forward to this implementation.
    
    Since:
    
    7.0

Class ForwardingMapEntry<K extends @Nullable java.lang.Object,​V extends @Nullable java.lang.Object>

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

ForwardingMapEntry

Method Detail

delegate

getKey

getValue

setValue

equals

hashCode

standardEquals

standardHashCode

standardToString

Class ForwardingMapEntry<K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object>