Package com.google.common.collect

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

  • All Implemented Interfaces:
    Map.Entry<K,​V>
    @GwtCompatible
public abstract class ForwardingMapEntry<K extends @Nullable Object,​V extends @Nullable Object>
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
    Author:
    Mike Bostock, Louis Wasserman