## com.google.common.collect
Class ForwardingMapEntry<K,V>

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

All Implemented Interfaces:
  Map.Entry<K,V>

    @GwtCompatible
    public abstract class ForwardingMapEntry<K,V>

extends ForwardingObject
implements 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 (imported from Google Collections Library)
Author:
  Mike Bostock, Louis Wasserman

Constructor Summary
`protected` `ForwardingMapEntry()` Constructor for use by subclasses.

Method Summary
`protected abstract Map.Entry<K,V>` `delegate()` Returns the backing delegate instance that methods are forwarded to.
`boolean` `equals(Object object)`
`K` `getKey()`
`V` `getValue()`
`int` `hashCode()`
`V` `setValue(V value)`
`protected boolean` `standardEquals(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 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 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 `Map.Entry<K,V>`

### getValue

    public V getValue()

  Specified by:
    `getValue` in interface `Map.Entry<K,V>`

### setValue

    public V setValue(V value)

  Specified by:
    `setValue` in interface `Map.Entry<K,V>`

### equals

    public boolean equals(@Nullable
                          Object object)

  Specified by:
    `equals` in interface `Map.Entry<K,V>`
  Overrides:
    `equals` in class `Object`

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in interface `Map.Entry<K,V>`
  Overrides:
    `hashCode` in class `Object`

### standardEquals

    @Beta
    protected boolean standardEquals(@Nullable
                                          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

    @Beta
    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

    @Beta
    protected 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

Copyright © 2010-2012. All Rights Reserved.