Class ForwardingSortedSet<E>

  • All Implemented Interfaces:
    java.lang.Iterable<E>, java.util.Collection<E>, java.util.Set<E>, java.util.SortedSet<E>
    Direct Known Subclasses:
    ForwardingNavigableSet, Sets.UnmodifiableNavigableSet

    public abstract class ForwardingSortedSet<E>
    extends ForwardingSet<E>
    implements java.util.SortedSet<E>
    A sorted set which forwards all its method calls to another sorted set. Subclasses should override one or more methods to modify the behavior of the backing sorted set as desired per the decorator pattern.

    Warning: The methods of ForwardingSortedSet forward indiscriminately to the methods of the delegate. For example, overriding ForwardingCollection.add(E) alone will not change the behavior of ForwardingCollection.addAll(java.util.Collection<? extends E>), which can lead to unexpected behavior. In this case, you should override addAll as well, either providing your own implementation, or delegating to the provided standardAddAll 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 ForwardingSortedSet.

    Each of the standard methods, where appropriate, uses the set's comparator (or the natural ordering of the elements, if there is no comparator) to test element equality. As a result, if the comparator is not consistent with equals, some of the standard implementations may violate the Set contract.

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

    Since:
    2.0
    • Constructor Detail

      • ForwardingSortedSet

        protected ForwardingSortedSet()
        Constructor for use by subclasses.
    • Method Detail

      • delegate

        protected abstract java.util.SortedSet<E> 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 ForwardingSet<E>
      • comparator

        public java.util.Comparator<? super E> comparator()
        Specified by:
        comparator in interface java.util.SortedSet<E>
      • first

        public E first()
        Specified by:
        first in interface java.util.SortedSet<E>
      • headSet

        public java.util.SortedSet<E> headSet​(E toElement)
        Specified by:
        headSet in interface java.util.SortedSet<E>
      • last

        public E last()
        Specified by:
        last in interface java.util.SortedSet<E>
      • subSet

        public java.util.SortedSet<E> subSet​(E fromElement,
                                             E toElement)
        Specified by:
        subSet in interface java.util.SortedSet<E>
      • tailSet

        public java.util.SortedSet<E> tailSet​(E fromElement)
        Specified by:
        tailSet in interface java.util.SortedSet<E>
      • unsafeCompare

        private int unsafeCompare​(java.lang.Object o1,
                                  java.lang.Object o2)