LongArrayFIFOQueue (fastutil 6.4.1 API)

java.lang.Object
- it.unimi.dsi.fastutil.AbstractPriorityQueue<Long>
- - it.unimi.dsi.fastutil.longs.AbstractLongPriorityQueue
  - - it.unimi.dsi.fastutil.longs.LongArrayFIFOQueue

All Implemented Interfaces:

LongPriorityQueue, PriorityQueue<Long>
```
public class LongArrayFIFOQueue
extends AbstractLongPriorityQueue
```
A type-specific array-based FIFO queue, supporting also deque operations.
Instances of this class represent a FIFO queue using a backing array in a circular way. The array is enlarged as needed, but it is never shrunk. Use the trim() method to reduce its size, if necessary.
This class provides additional methods that implement a deque (double-ended queue).

Field Summary

Fields
Modifier and Type	Field and Description
`protected long[]`	`array` The backing array.
`protected int`	`end` The end position in `array`.
`static int`	`INITIAL_CAPACITY` The standard initial capacity of a queue.
`protected int`	`length` The current (cached) length of `array`.
`protected int`	`start` The start position in `array`.

Constructor Summary

Constructors
Constructor and Description
`LongArrayFIFOQueue()` Creates a new empty queue with standard initial capacity.
`LongArrayFIFOQueue(int capacity)` Creates a new empty queue with given capacity.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`clear()` Removes all elements from this queue.
`LongComparator`	`comparator()` Returns `null` (FIFO queues have no comparator).
`long`	`dequeueLastLong()` Dequeues the last element from the queue.
`long`	`dequeueLong()` Dequeues the first element from the queue.
`void`	`enqueue(long x)` Enqueues a new element.
`void`	`enqueueFirst(long x)` Enqueues a new element as the first element (in dequeuing order) of the queue.
`long`	`firstLong()` Returns the first element of the queue.
`long`	`lastLong()` Returns the last element of the queue.
`int`	`size()` Returns the number of elements in this queue.
`void`	`trim()` Trims the queue to the smallest possible size.

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongPriorityQueue
dequeue, enqueue, first, last

Methods inherited from class it.unimi.dsi.fastutil.AbstractPriorityQueue
changed, isEmpty

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

Methods inherited from interface it.unimi.dsi.fastutil.PriorityQueue
changed, isEmpty

- Field Detail
  - INITIAL_CAPACITY
```
public static final int INITIAL_CAPACITY
```
    The standard initial capacity of a queue.
    
    See Also:
    Constant Field Values
  - array
```
protected long[] array
```
    The backing array.
  - length
```
protected int length
```
    The current (cached) length of array.
  - start
```
protected int start
```
    The start position in array. It is always strictly smaller than length.
  - end
```
protected int end
```
    The end position in array. It is always strictly smaller than length. Might be actually smaller than start because array is used cyclically.
- Constructor Detail
  - LongArrayFIFOQueue
```
public LongArrayFIFOQueue(int capacity)
```
    Creates a new empty queue with given capacity.
    
    Parameters:
    capacity - the initial capacity of this queue.
  - LongArrayFIFOQueue
```
public LongArrayFIFOQueue()
```
    Creates a new empty queue with standard initial capacity.
- Method Detail
  - comparator
```
public LongComparator comparator()
```
    Returns null (FIFO queues have no comparator).
    
    Returns:
    null.
    See Also:
    PriorityQueue.comparator()
  - dequeueLong
```
public long dequeueLong()
```
    Description copied from interface: LongPriorityQueue
    
    Dequeues the first element from the queue.
    
    Returns:
    the dequeued element.
  - dequeueLastLong
```
public long dequeueLastLong()
```
    Dequeues the last element from the queue.
    
    Returns:
    the dequeued element.
    
    Throws:
    
    NoSuchElementException - if the queue is empty.
  - enqueue
```
public void enqueue(long x)
```
    Description copied from interface: LongPriorityQueue
    
    Enqueues a new element.
    
    Parameters:
    x - the element to enqueue.
  - enqueueFirst
```
public void enqueueFirst(long x)
```
    Enqueues a new element as the first element (in dequeuing order) of the queue.
  - firstLong
```
public long firstLong()
```
    Returns the first element of the queue.
    
    Returns:
    the first element of the queue.
  - lastLong
```
public long lastLong()
```
    Returns the last element of the queue.
    
    Specified by:
    
    lastLong in interface LongPriorityQueue
    
    Overrides:
    
    lastLong in class AbstractLongPriorityQueue
    
    Returns:
    the last element of the queue.
  - clear
```
public void clear()
```
    Description copied from interface: PriorityQueue
    
    Removes all elements from this queue.
  - trim
```
public void trim()
```
    Trims the queue to the smallest possible size.
  - size
```
public int size()
```
    Description copied from interface: PriorityQueue
    
    Returns the number of elements in this queue.
    
    Returns:
    the number of elements in this queue.

Class LongArrayFIFOQueue

Field Summary

Constructor Summary

Method Summary

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongPriorityQueue

Methods inherited from class it.unimi.dsi.fastutil.AbstractPriorityQueue

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.PriorityQueue

Field Detail

INITIAL_CAPACITY

array

length

start

end

Constructor Detail

LongArrayFIFOQueue

LongArrayFIFOQueue

Method Detail

comparator

dequeueLong

dequeueLastLong

enqueue

enqueueFirst

firstLong

lastLong

clear

trim

size