it.unimi.dsi.fastutil.floats
Class FloatArrayFIFOQueue

java.lang.Object
  it.unimi.dsi.fastutil.AbstractPriorityQueue<java.lang.Float>
      it.unimi.dsi.fastutil.floats.AbstractFloatPriorityQueue
          it.unimi.dsi.fastutil.floats.FloatArrayFIFOQueue

All Implemented Interfaces:

FloatPriorityQueue, PriorityQueue<java.lang.Float>

public class FloatArrayFIFOQueue
extends AbstractFloatPriorityQueue

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).

Field Summary

static int

INITIAL_CAPACITY The standard initial capacity of a queue.

Constructor Summary

FloatArrayFIFOQueue()
Creates a new empty queue with standard initial capacity.

FloatArrayFIFOQueue(int capacity)
Creates a new empty queue with given capacity.

Method Summary

void	clear() Removes all elements from this queue.
FloatComparator	comparator() Returns null (FIFO queues have no comparator).
float	dequeueFloat() Dequeues the first element from the queue.
float	dequeueLastFloat() Dequeues the last element from the queue.
void	enqueue(float x) Enqueues a new element.
void	enqueueFirst(float x) Enqueues a new element as the first element (in dequeuing order) of the queue.
float	firstFloat() Returns the first element of the queue.
float	lastFloat() 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.floats.AbstractFloatPriorityQueue

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

FloatArrayFIFOQueue

public FloatArrayFIFOQueue(int capacity)

Creates a new empty queue with given capacity.

Parameters:

capacity - the initial capacity of this queue.

FloatArrayFIFOQueue

public FloatArrayFIFOQueue()

Creates a new empty queue with standard initial capacity.

Method Detail

comparator

public FloatComparator comparator()

Returns null (FIFO queues have no comparator).

Returns:

null.

See Also:

PriorityQueue.comparator()

dequeueFloat

public float dequeueFloat()

Description copied from interface: FloatPriorityQueue

Dequeues the first element from the queue.

Returns:

the dequeued element.

dequeueLastFloat

public float dequeueLastFloat()

Dequeues the last element from the queue.

Returns:

the dequeued element.

Throws:

java.util.NoSuchElementException - if the queue is empty.

enqueue

public void enqueue(float x)

Description copied from interface: FloatPriorityQueue

Enqueues a new element.

Parameters:

x - the element to enqueue.

enqueueFirst

public void enqueueFirst(float x)

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

firstFloat

public float firstFloat()

Returns the first element of the queue.

Returns:

the first element of the queue.

lastFloat

public float lastFloat()

Returns the last element of the queue.

Specified by:

lastFloat in interface FloatPriorityQueue

Overrides:

lastFloat in class AbstractFloatPriorityQueue

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.