Class ForwardingMultiset<E extends @Nullable java.lang.Object>

  • All Implemented Interfaces:
    Multiset<E>, java.lang.Iterable<E>, java.util.Collection<E>
    Direct Known Subclasses:
    ForwardingSortedMultiset, ForwardingSortedMultiset.StandardDescendingMultiset

    public abstract class ForwardingMultiset<E extends @Nullable java.lang.Object>
    extends ForwardingCollection<E>
    implements Multiset<E>
    A multiset which forwards all its method calls to another multiset. Subclasses should override one or more methods to modify the behavior of the backing multiset as desired per the decorator pattern.

    Warning: The methods of ForwardingMultiset forward indiscriminately to the methods of the delegate. For example, overriding add(Object, int) alone will not change the behavior of ForwardingCollection.add(Object), which can lead to unexpected behavior. In this case, you should override add(Object) as well, either providing your own implementation, or delegating to the provided standardAdd method.

    default method warning: This class does not forward calls to default methods. Instead, it inherits their default implementations. When those implementations invoke methods, they invoke methods on the ForwardingMultiset.

    The standard methods and any collection views they return are not guaranteed to be thread-safe, even when all of the methods that they depend on are thread-safe.

    Kevin Bourrillion, Louis Wasserman