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

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

All Implemented Interfaces:
  Iterable<E>, Collection<E>, Queue<E>

Direct Known Subclasses:
  ForwardingBlockingQueue, ForwardingDeque

    @GwtCompatible
    public abstract class ForwardingQueue<E>

extends ForwardingCollection<E>
implements Queue<E>

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

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

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 (imported from Google Collections Library)
Author:
  Mike Bostock, Louis Wasserman

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

Method Summary
`protected abstract Queue<E>` | `delegate()` Returns the backing delegate instance that methods are forwarded to.
`E` | `element()`
`boolean` | `offer(E o)`
`E` | `peek()`
`E` | `poll()`
`E` | `remove()`
`protected boolean` | `standardOffer(E e)` A sensible definition of `offer(E)` in terms of `ForwardingCollection.add(E)`.
`protected E` | `standardPeek()` A sensible definition of `peek()` in terms of `element()`.
`protected E` | `standardPoll()` A sensible definition of `poll()` in terms of `remove()`.

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.Queue
`add`

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

Constructor Detail

### ForwardingQueue

    protected ForwardingQueue()

  Constructor for use by subclasses.

Method Detail

### delegate

    protected abstract Queue<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 `ForwardingCollection<E>`

### offer

    public boolean offer(E o)

  Specified by:
    `offer` in interface `Queue<E>`

### poll

    public E poll()

  Specified by:
    `poll` in interface `Queue<E>`

### remove

    public E remove()

  Specified by:
    `remove` in interface `Queue<E>`

### peek

    public E peek()

  Specified by:
    `peek` in interface `Queue<E>`

### element

    public E element()

  Specified by:
    `element` in interface `Queue<E>`

### standardOffer

    @Beta
    protected boolean standardOffer(E e)

  A sensible definition of `offer(E)` in terms of `ForwardingCollection.add(E)`. If you override `ForwardingCollection.add(E)`, you may wish to override `offer(E)` to forward to this implementation.

  Since:
    7.0

### standardPeek

    @Beta
    protected E standardPeek()

  A sensible definition of `peek()` in terms of `element()`. If you override `element()`, you may wish to override `peek()` to forward to this implementation.

  Since:
    7.0

### standardPoll

    @Beta
    protected E standardPoll()

  A sensible definition of `poll()` in terms of `remove()`. If you override `remove()`, you may wish to override `poll()` to forward to this implementation.

  Since:
    7.0

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