com.google.common.collect

## Class ForwardingDeque<E>

- java.lang.Object
- - com.google.common.collect.ForwardingObject
  - - com.google.common.collect.ForwardingCollection<E>
    - - com.google.common.collect.ForwardingQueue<E>
      - - com.google.common.collect.ForwardingDeque<E>

- All Implemented Interfaces:
    java.lang.Iterable<E>, java.util.Collection<E>, java.util.Deque<E>, java.util.Queue<E>
  Direct Known Subclasses:
    ForwardingBlockingDeque

      public abstract class ForwardingDeque<E>
      extends ForwardingQueue<E>
      implements java.util.Deque<E>

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

  Warning: The methods of `ForwardingDeque` forward indiscriminately to the methods of the delegate. For example, overriding `ForwardingCollection.add(E)` alone will not change the behavior of `ForwardingQueue.offer(E)` which can lead to unexpected behavior. In this case, you should override `offer` as well.

  Since:
    12.0

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `ForwardingDeque()` Constructor for use by subclasses.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addFirst(E e)`
    `void` | `addLast(E e)`
    `protected abstract java.util.Deque<E>` | `delegate()` Returns the backing delegate instance that methods are forwarded to.
    `java.util.Iterator<E>` | `descendingIterator()`
    `E` | `getFirst()`
    `E` | `getLast()`
    `boolean` | `offerFirst(E e)`
    `boolean` | `offerLast(E e)`
    `E` | `peekFirst()`
    `E` | `peekLast()`
    `E` | `pollFirst()`
    `E` | `pollLast()`
    `E` | `pop()`
    `void` | `push(E e)`
    `E` | `removeFirst()`
    `boolean` | `removeFirstOccurrence(java.lang.Object o)`
    `E` | `removeLast()`
    `boolean` | `removeLastOccurrence(java.lang.Object o)`

    - ### Methods inherited from class com.google.common.collect.ForwardingQueue

      `element, offer, peek, poll, remove, standardOffer, standardPeek, standardPoll`

    - ### Methods inherited from class com.google.common.collect.ForwardingCollection

      `add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, standardAddAll, standardClear, standardContains, standardContainsAll, standardIsEmpty, standardRemove, standardRemoveAll, standardRetainAll, standardToArray, standardToArray, standardToString, toArray, toArray`

    - ### Methods inherited from class com.google.common.collect.ForwardingObject

      `toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface java.util.Deque

      `add, contains, element, iterator, offer, peek, poll, remove, remove, size`

    - ### Methods inherited from interface java.util.Collection

      `addAll, clear, containsAll, equals, hashCode, isEmpty, removeAll, retainAll, toArray, toArray`

- - ### Constructor Detail

    - #### ForwardingDeque

          protected ForwardingDeque()

      Constructor for use by subclasses.

  - ### Method Detail

    - #### delegate

          protected abstract java.util.Deque<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 `ForwardingQueue<E>`

    - #### addFirst

          public void addFirst(E e)

      Specified by:
        `addFirst` in interface `java.util.Deque<E>`

    - #### addLast

          public void addLast(E e)

      Specified by:
        `addLast` in interface `java.util.Deque<E>`

    - #### descendingIterator

          public java.util.Iterator<E> descendingIterator()

      Specified by:
        `descendingIterator` in interface `java.util.Deque<E>`

    - #### getFirst

          public E getFirst()

      Specified by:
        `getFirst` in interface `java.util.Deque<E>`

    - #### getLast

          public E getLast()

      Specified by:
        `getLast` in interface `java.util.Deque<E>`

    - #### offerFirst

          public boolean offerFirst(E e)

      Specified by:
        `offerFirst` in interface `java.util.Deque<E>`

    - #### offerLast

          public boolean offerLast(E e)

      Specified by:
        `offerLast` in interface `java.util.Deque<E>`

    - #### peekFirst

          public E peekFirst()

      Specified by:
        `peekFirst` in interface `java.util.Deque<E>`

    - #### peekLast

          public E peekLast()

      Specified by:
        `peekLast` in interface `java.util.Deque<E>`

    - #### pollFirst

          public E pollFirst()

      Specified by:
        `pollFirst` in interface `java.util.Deque<E>`

    - #### pollLast

          public E pollLast()

      Specified by:
        `pollLast` in interface `java.util.Deque<E>`

    - #### pop

          public E pop()

      Specified by:
        `pop` in interface `java.util.Deque<E>`

    - #### push

          public void push(E e)

      Specified by:
        `push` in interface `java.util.Deque<E>`

    - #### removeFirst

          public E removeFirst()

      Specified by:
        `removeFirst` in interface `java.util.Deque<E>`

    - #### removeLast

          public E removeLast()

      Specified by:
        `removeLast` in interface `java.util.Deque<E>`

    - #### removeFirstOccurrence

          public boolean removeFirstOccurrence(java.lang.Object o)

      Specified by:
        `removeFirstOccurrence` in interface `java.util.Deque<E>`

    - #### removeLastOccurrence

          public boolean removeLastOccurrence(java.lang.Object o)

      Specified by:
        `removeLastOccurrence` in interface `java.util.Deque<E>`