@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 int hashCode()
protected boolean standardEquals(@Nullable 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 © 2010-2017. All Rights Reserved.