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## com.google.common.collect
Class ForwardingNavigableSet<E>

    java.lang.Object
      com.google.common.collect.ForwardingObject
          com.google.common.collect.ForwardingCollection<E>
              com.google.common.collect.ForwardingSet<E>
                  com.google.common.collect.ForwardingSortedSet<E>
                      com.google.common.collect.ForwardingNavigableSet<E>

All Implemented Interfaces:
  Iterable<E>, Collection<E>, NavigableSet<E>, Set<E>, SortedSet<E>

Direct Known Subclasses:
  ForwardingNavigableSet.StandardDescendingSet

    @Beta
    public abstract class ForwardingNavigableSet<E>

extends ForwardingSortedSet<E>
implements NavigableSet<E>

A navigable set which forwards all its method calls to another navigable set. Subclasses should override one or more methods to modify the behavior of the backing set as desired per the decorator pattern.

Warning: The methods of `ForwardingNavigableSet` 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)`, 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.

Each of the `standard` methods 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:
  12.0
Author:
  Louis Wasserman

Nested Class Summary
`protected class` | `ForwardingNavigableSet.StandardDescendingSet` A sensible implementation of `NavigableSet.descendingSet()` in terms of the other methods of `NavigableSet`, notably including `NavigableSet.descendingIterator()`.

Constructor Summary
`protected` | `ForwardingNavigableSet()` Constructor for use by subclasses.

Method Summary
`E` | `ceiling(E e)`
`protected abstract NavigableSet<E>` | `delegate()` Returns the backing delegate instance that methods are forwarded to.
`Iterator<E>` | `descendingIterator()`
`NavigableSet<E>` | `descendingSet()`
`E` | `floor(E e)`
`NavigableSet<E>` | `headSet(E toElement, boolean inclusive)`
`E` | `higher(E e)`
`E` | `lower(E e)`
`E` | `pollFirst()`
`E` | `pollLast()`
`protected E` | `standardCeiling(E e)` A sensible definition of `ceiling(E)` in terms of the `iterator` method of `tailSet(Object, boolean)`.
`protected E` | `standardFirst()`
`protected E` | `standardFloor(E e)` A sensible definition of `floor(E)` in terms of the `descendingIterator` method of `headSet(Object, boolean)`.
`protected SortedSet<E>` | `standardHeadSet(E toElement)` A sensible definition of `ForwardingSortedSet.headSet(Object)` in terms of the `headSet(Object, boolean)` method.
`protected E` | `standardHigher(E e)` A sensible definition of `higher(E)` in terms of the `iterator` method of `tailSet(Object, boolean)`.
`protected E` | `standardLast()`
`protected E` | `standardLower(E e)` A sensible definition of `lower(E)` in terms of the `descendingIterator` method of `headSet(Object, boolean)`.
`protected E` | `standardPollFirst()` A sensible definition of `pollFirst()` in terms of the `iterator` method.
`protected E` | `standardPollLast()` A sensible definition of `pollLast()` in terms of the `descendingIterator` method.
`protected NavigableSet<E>` | `standardSubSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)` A sensible definition of `subSet(Object, boolean, Object, boolean)` in terms of the `headSet` and `tailSet` methods.
`protected SortedSet<E>` | `standardSubSet(E fromElement, E toElement)` A sensible definition of `ForwardingSortedSet.subSet(Object, Object)` in terms of the `subSet(Object, boolean, Object, boolean)` method.
`protected SortedSet<E>` | `standardTailSet(E fromElement)` A sensible definition of `ForwardingSortedSet.tailSet(Object)` in terms of the `tailSet(Object, boolean)` method.
`NavigableSet<E>` | `subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)`
`NavigableSet<E>` | `tailSet(E fromElement, boolean inclusive)`

Methods inherited from class com.google.common.collect.ForwardingSortedSet
`comparator, first, headSet, last, standardContains, standardRemove, subSet, tailSet`

Methods inherited from class com.google.common.collect.ForwardingSet
`equals, hashCode, standardEquals, standardHashCode, standardRemoveAll`

Methods inherited from class com.google.common.collect.ForwardingCollection
`add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, standardAddAll, standardClear, standardContainsAll, standardIsEmpty, standardRetainAll, standardToArray, standardToArray, standardToString, toArray, toArray`

Methods inherited from class com.google.common.collect.ForwardingObject
`toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.NavigableSet
`headSet, iterator, subSet, tailSet`

Methods inherited from interface java.util.SortedSet
`comparator, first, last`

Methods inherited from interface java.util.Set
`add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, remove, removeAll, retainAll, size, toArray, toArray`

Constructor Detail

### ForwardingNavigableSet

    protected ForwardingNavigableSet()

  Constructor for use by subclasses.

Method Detail

### delegate

    protected abstract NavigableSet<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 `ForwardingSortedSet<E>`

### lower

    public E lower(E e)

  Specified by:
    `lower` in interface `NavigableSet<E>`

### standardLower

    protected E standardLower(E e)

  A sensible definition of `lower(E)` in terms of the `descendingIterator` method of `headSet(Object, boolean)`. If you override `headSet(Object, boolean)`, you may wish to override `lower(E)` to forward to this implementation.

### floor

    public E floor(E e)

  Specified by:
    `floor` in interface `NavigableSet<E>`

### standardFloor

    protected E standardFloor(E e)

  A sensible definition of `floor(E)` in terms of the `descendingIterator` method of `headSet(Object, boolean)`. If you override `headSet(Object, boolean)`, you may wish to override `floor(E)` to forward to this implementation.

### ceiling

    public E ceiling(E e)

  Specified by:
    `ceiling` in interface `NavigableSet<E>`

### standardCeiling

    protected E standardCeiling(E e)

  A sensible definition of `ceiling(E)` in terms of the `iterator` method of `tailSet(Object, boolean)`. If you override `tailSet(Object, boolean)`, you may wish to override `ceiling(E)` to forward to this implementation.

### higher

    public E higher(E e)

  Specified by:
    `higher` in interface `NavigableSet<E>`

### standardHigher

    protected E standardHigher(E e)

  A sensible definition of `higher(E)` in terms of the `iterator` method of `tailSet(Object, boolean)`. If you override `tailSet(Object, boolean)`, you may wish to override `higher(E)` to forward to this implementation.

### pollFirst

    public E pollFirst()

  Specified by:
    `pollFirst` in interface `NavigableSet<E>`

### standardPollFirst

    protected E standardPollFirst()

  A sensible definition of `pollFirst()` in terms of the `iterator` method. If you override `ForwardingCollection.iterator()` you may wish to override `pollFirst()` to forward to this implementation.

### pollLast

    public E pollLast()

  Specified by:
    `pollLast` in interface `NavigableSet<E>`

### standardPollLast

    protected E standardPollLast()

  A sensible definition of `pollLast()` in terms of the `descendingIterator` method. If you override `descendingIterator()` you may wish to override `pollLast()` to forward to this implementation.

### standardFirst

    protected E standardFirst()

### standardLast

    protected E standardLast()

### descendingSet

    public NavigableSet<E> descendingSet()

  Specified by:
    `descendingSet` in interface `NavigableSet<E>`

### descendingIterator

    public Iterator<E> descendingIterator()

  Specified by:
    `descendingIterator` in interface `NavigableSet<E>`

### subSet

    public NavigableSet<E> subSet(E fromElement,
                                  boolean fromInclusive,
                                  E toElement,
                                  boolean toInclusive)

  Specified by:
    `subSet` in interface `NavigableSet<E>`

### standardSubSet

    protected NavigableSet<E> standardSubSet(E fromElement,
                                             boolean fromInclusive,
                                             E toElement,
                                             boolean toInclusive)

  A sensible definition of `subSet(Object, boolean, Object, boolean)` in terms of the `headSet` and `tailSet` methods. In many cases, you may wish to override `subSet(Object, boolean, Object, boolean)` to forward to this implementation.

### standardSubSet

    protected SortedSet<E> standardSubSet(E fromElement,
                                          E toElement)

  A sensible definition of `ForwardingSortedSet.subSet(Object, Object)` in terms of the `subSet(Object, boolean, Object, boolean)` method. If you override `subSet(Object, boolean, Object, boolean)`, you may wish to override `ForwardingSortedSet.subSet(Object, Object)` to forward to this implementation.

  Overrides:
    `standardSubSet` in class `ForwardingSortedSet<E>`

### headSet

    public NavigableSet<E> headSet(E toElement,
                                   boolean inclusive)

  Specified by:
    `headSet` in interface `NavigableSet<E>`

### standardHeadSet

    protected SortedSet<E> standardHeadSet(E toElement)

  A sensible definition of `ForwardingSortedSet.headSet(Object)` in terms of the `headSet(Object, boolean)` method. If you override `headSet(Object, boolean)`, you may wish to override `ForwardingSortedSet.headSet(Object)` to forward to this implementation.

### tailSet

    public NavigableSet<E> tailSet(E fromElement,
                                   boolean inclusive)

  Specified by:
    `tailSet` in interface `NavigableSet<E>`

### standardTailSet

    protected SortedSet<E> standardTailSet(E fromElement)

  A sensible definition of `ForwardingSortedSet.tailSet(Object)` in terms of the `tailSet(Object, boolean)` method. If you override `tailSet(Object, boolean)`, you may wish to override `ForwardingSortedSet.tailSet(Object)` to forward to this implementation.

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