it.unimi.dsi.fastutil.shorts

Class ShortArrayFIFOQueue

java.lang.Object

it.unimi.dsi.fastutil.AbstractPriorityQueue<Short>

it.unimi.dsi.fastutil.shorts.AbstractShortPriorityQueue

it.unimi.dsi.fastutil.shorts.ShortArrayFIFOQueue

All Implemented Interfaces:

PriorityQueue<Short>, ShortPriorityQueue, Serializable

public class ShortArrayFIFOQueue
extends AbstractShortPriorityQueue
implements Serializable

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 and shrunk as needed. You can use the trim() method to reduce its memory usage, if necessary.

This class provides additional methods that implement a deque (double-ended queue).

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	INITIAL_CAPACITY The standard initial capacity of a queue.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all elements from this queue.
ShortComparator	comparator() Returns null (FIFO queues have no comparator).
short	dequeueLastShort() Dequeues the last element from the queue.
short	dequeueShort() Dequeues the first element from the queue.
void	enqueue(short x) Enqueues a new element.
void	enqueueFirst(short x) Enqueues a new element as the first element (in dequeuing order) of the queue.
short	firstShort() Returns the first element of the queue.
short	lastShort() 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.shorts.AbstractShortPriorityQueue

dequeue, enqueue, first, last

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

changed, isEmpty

Methods inherited from class java.lang.Object

equals, 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

Constructor Detail

ShortArrayFIFOQueue

public ShortArrayFIFOQueue(int capacity)

Creates a new empty queue with given capacity.

Parameters:

capacity - the initial capacity of this queue.

ShortArrayFIFOQueue

public ShortArrayFIFOQueue()

Creates a new empty queue with standard initial capacity.

Method Detail

comparator

public ShortComparator comparator()

Returns null (FIFO queues have no comparator).

Specified by:

comparator in interface PriorityQueue<Short>

Specified by:

comparator in interface ShortPriorityQueue

Returns:

null.

See Also:

PriorityQueue.comparator()

dequeueShort

public short dequeueShort()

Description copied from interface: ShortPriorityQueue

Dequeues the first element from the queue.

Specified by:

dequeueShort in interface ShortPriorityQueue

Returns:

the dequeued element.

dequeueLastShort

public short dequeueLastShort()

Dequeues the last element from the queue.

Returns:

the dequeued element.

Throws:

NoSuchElementException - if the queue is empty.

enqueue

public void enqueue(short x)

Description copied from interface: ShortPriorityQueue

Enqueues a new element.

Specified by:

enqueue in interface ShortPriorityQueue

Parameters:

x - the element to enqueue.

enqueueFirst

public void enqueueFirst(short x)

Enqueues a new element as the first element (in dequeuing order) of the queue.

firstShort

public short firstShort()

Returns the first element of the queue.

Specified by:

firstShort in interface ShortPriorityQueue

Returns:

the first element of the queue.

lastShort

public short lastShort()

Returns the last element of the queue.

Specified by:

lastShort in interface ShortPriorityQueue

Overrides:

lastShort in class AbstractShortPriorityQueue

Returns:

the last element of the queue.

clear

public void clear()

Description copied from interface: PriorityQueue

Removes all elements from this queue.

Specified by:

clear in interface PriorityQueue<Short>

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.

Specified by:

size in interface PriorityQueue<Short>

Returns:

the number of elements in this queue.