java.lang.Object
- java.util.AbstractCollection<E>
- - java.util.AbstractQueue<E>
  - - org.opendaylight.yangtools.util.EmptyDeque<E>

Type Parameters:

E - the type of elements held in this collection

All Implemented Interfaces:

Iterable<E>, Collection<E>, Deque<E>, Queue<E>, Immutable, MutationBehaviour<Immutable>
```
@Beta
public final class EmptyDeque<E>
extends AbstractQueue<E>
implements Deque<E>, Immutable
```
A specialized always-empty implementation of Deque. This implementation will always refuse new elements in its offer(Object) method.

Author:

Robert Varga

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addFirst(E e)`
`void`	`addLast(E e)`
`Iterator<E>`	`descendingIterator()`
`E`	`getFirst()`
`E`	`getLast()`
`static <T> EmptyDeque<T>`	`instance()`
`Iterator<E>`	`iterator()`
`boolean`	`offer(E e)`
`boolean`	`offerFirst(E e)`
`boolean`	`offerLast(E e)`
`E`	`peek()`
`E`	`peekFirst()`
`E`	`peekLast()`
`E`	`poll()`
`E`	`pollFirst()`
`E`	`pollLast()`
`E`	`pop()`
`void`	`push(E e)`
`E`	`removeFirst()`
`boolean`	`removeFirstOccurrence(Object o)`
`E`	`removeLast()`
`boolean`	`removeLastOccurrence(Object o)`
`int`	`size()`
`Spliterator<E>`	`spliterator()`
`Object[]`	`toArray()`
`<T> T[]`	`toArray(T[] a)`

Methods inherited from class java.util.AbstractQueue
add, addAll, clear, element, remove

Methods inherited from class java.util.AbstractCollection
contains, containsAll, isEmpty, remove, removeAll, retainAll, toString

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

Methods inherited from interface java.util.Collection
clear, containsAll, equals, hashCode, isEmpty, parallelStream, removeAll, removeIf, retainAll, stream, toArray

Methods inherited from interface java.util.Deque
add, addAll, contains, element, remove, remove

Methods inherited from interface java.lang.Iterable
forEach

- Method Detail
  - instance
```
public static <T> EmptyDeque<T> instance()
```
  - offer
```
public boolean offer(E e)
```
    Specified by:
    
    offer in interface Deque<E>
    
    Specified by:
    
    offer in interface Queue<E>
  - offerFirst
```
public boolean offerFirst(E e)
```
    Specified by:
    
    offerFirst in interface Deque<E>
  - offerLast
```
public boolean offerLast(E e)
```
    Specified by:
    
    offerLast in interface Deque<E>
  - poll
```
public E poll()
```
    Specified by:
    
    poll in interface Deque<E>
    
    Specified by:
    
    poll in interface Queue<E>
  - pollFirst
```
public E pollFirst()
```
    Specified by:
    
    pollFirst in interface Deque<E>
  - pollLast
```
public E pollLast()
```
    Specified by:
    
    pollLast in interface Deque<E>
  - peek
```
public E peek()
```
    Specified by:
    
    peek in interface Deque<E>
    
    Specified by:
    
    peek in interface Queue<E>
  - peekFirst
```
public E peekFirst()
```
    Specified by:
    
    peekFirst in interface Deque<E>
  - peekLast
```
public E peekLast()
```
    Specified by:
    
    peekLast in interface Deque<E>
  - iterator
```
public Iterator<E> iterator()
```
    Specified by:
    
    iterator in interface Collection<E>
    
    Specified by:
    
    iterator in interface Deque<E>
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Specified by:
    
    iterator in class AbstractCollection<E>
  - spliterator
```
public Spliterator<E> spliterator()
```
    Specified by:
    
    spliterator in interface Collection<E>
    
    Specified by:
    
    spliterator in interface Iterable<E>
  - size
```
public int size()
```
    Specified by:
    
    size in interface Collection<E>
    
    Specified by:
    
    size in interface Deque<E>
    
    Specified by:
    
    size in class AbstractCollection<E>
  - toArray
```
public Object[] toArray()
```
    Specified by:
    
    toArray in interface Collection<E>
    
    Overrides:
    
    toArray in class AbstractCollection<E>
  - toArray
```
public <T> T[] toArray(T[] a)
```
    Specified by:
    
    toArray in interface Collection<E>
    
    Overrides:
    
    toArray in class AbstractCollection<E>
  - addFirst
```
public void addFirst(E e)
```
    Specified by:
    
    addFirst in interface Deque<E>
  - addLast
```
public void addLast(E e)
```
    Specified by:
    
    addLast in interface Deque<E>
  - removeFirst
```
public E removeFirst()
```
    Specified by:
    
    removeFirst in interface Deque<E>
  - removeLast
```
public E removeLast()
```
    Specified by:
    
    removeLast in interface Deque<E>
  - getFirst
```
public E getFirst()
```
    Specified by:
    
    getFirst in interface Deque<E>
  - getLast
```
public E getLast()
```
    Specified by:
    
    getLast in interface Deque<E>
  - removeFirstOccurrence
```
public boolean removeFirstOccurrence(Object o)
```
    Specified by:
    
    removeFirstOccurrence in interface Deque<E>
  - removeLastOccurrence
```
public boolean removeLastOccurrence(Object o)
```
    Specified by:
    
    removeLastOccurrence in interface Deque<E>
  - push
```
public void push(E e)
```
    Specified by:
    
    push in interface Deque<E>
  - pop
```
public E pop()
```
    Specified by:
    
    pop in interface Deque<E>
  - descendingIterator
```
public Iterator<E> descendingIterator()
```
    Specified by:
    
    descendingIterator in interface Deque<E>

Class EmptyDeque<E>

Method Summary

Methods inherited from class java.util.AbstractQueue

Methods inherited from class java.util.AbstractCollection

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Collection

Methods inherited from interface java.util.Deque

Methods inherited from interface java.lang.Iterable

Method Detail

instance

offer

offerFirst

offerLast

poll

pollFirst

pollLast

peek

peekFirst

peekLast

iterator

spliterator

size

toArray

toArray

addFirst

addLast

removeFirst

removeLast

getFirst

getLast

removeFirstOccurrence

removeLastOccurrence

push

pop

descendingIterator