@GwtCompatible public abstract class ForwardingMapEntry<K,V> extends ForwardingObject implements Map.Entry<K,V>
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.
Modifier | Constructor and Description |
---|---|
protected |
ForwardingMapEntry()
Constructor for use by subclasses.
|
Modifier and Type | Method and Description |
---|---|
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)
|
protected int |
standardHashCode()
|
protected String |
standardToString()
|
toString
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
comparingByKey, comparingByKey, comparingByValue, comparingByValue
protected ForwardingMapEntry()
protected abstract Map.Entry<K,V> delegate()
ForwardingObject
ForwardingSet.delegate()
. Concrete subclasses override this method to supply the
instance being decorated.delegate
in class ForwardingObject
public boolean equals(Object object)
public int hashCode()
protected boolean standardEquals(Object object)
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.protected int standardHashCode()
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.@Beta protected String standardToString()
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.Copyright © 2010–2019. All rights reserved.