it.unimi.dsi.fastutil.bytes

Class ByteArrayPriorityQueue

java.lang.Object

it.unimi.dsi.fastutil.bytes.ByteArrayPriorityQueue

All Implemented Interfaces:

BytePriorityQueue, it.unimi.dsi.fastutil.PriorityQueue<java.lang.Byte>, java.io.Serializable

public class ByteArrayPriorityQueue
extends java.lang.Object
implements BytePriorityQueue, java.io.Serializable

A type-specific array-based priority queue.

Instances of this class represent a priority queue using a backing array—all operations are performed directly on the array. The array is enlarged as needed, but it is never shrunk. Use the trim() method to reduce its size, if necessary.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	array The backing array.
protected it.unimi.dsi.fastutil.bytes.ByteComparator	c The type-specific comparator used in this queue.
protected int	firstIndex The first index, cached, if firstIndexValid is true.
protected boolean	firstIndexValid Whether firstIndex contains a valid value.
protected int	size The number of elements in this queue.

Constructor Summary

Constructors

Constructor and Description
ByteArrayPriorityQueue() Creates a new empty queue using the natural order.
ByteArrayPriorityQueue(byte[] a) Wraps a given array in a queue using the natural order.
ByteArrayPriorityQueue(byte[] a, it.unimi.dsi.fastutil.bytes.ByteComparator c) Wraps a given array in a queue using a given comparator.
ByteArrayPriorityQueue(byte[] a, int size) Wraps a given array in a queue using the natural order.
ByteArrayPriorityQueue(byte[] a, int size, it.unimi.dsi.fastutil.bytes.ByteComparator c) Wraps a given array in a queue using a given comparator.
ByteArrayPriorityQueue(it.unimi.dsi.fastutil.bytes.ByteComparator c) Creates a new empty queue with a given comparator.
ByteArrayPriorityQueue(int capacity) Creates a new empty queue with a given capacity and using the natural order.
ByteArrayPriorityQueue(int capacity, it.unimi.dsi.fastutil.bytes.ByteComparator c) Creates a new empty queue with a given capacity and comparator.

Method Summary

Modifier and Type	Method and Description
void	changed()
void	clear()
it.unimi.dsi.fastutil.bytes.ByteComparator	comparator() Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.
byte	dequeueByte() Dequeues the first element from the queue.
void	enqueue(byte x) Enqueues a new element.
byte	firstByte() Returns the first element of the queue.
int	size()
void	trim() Trims the underlying array so that it has exactly size() elements.

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.bytes.BytePriorityQueue

dequeue, enqueue, first, last, lastByte

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

isEmpty

Field Detail

array

protected transient byte[] array

The backing array.

size

protected int size

The number of elements in this queue.

c

protected it.unimi.dsi.fastutil.bytes.ByteComparator c

The type-specific comparator used in this queue.

firstIndex

protected transient int firstIndex

The first index, cached, if firstIndexValid is true.

firstIndexValid

protected transient boolean firstIndexValid

Whether firstIndex contains a valid value.

Constructor Detail

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(int capacity,
                              it.unimi.dsi.fastutil.bytes.ByteComparator c)

Creates a new empty queue with a given capacity and comparator.

Parameters:

capacity - the initial capacity of this queue.

c - the comparator used in this queue, or null for the natural order.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(int capacity)

Creates a new empty queue with a given capacity and using the natural order.

Parameters:

capacity - the initial capacity of this queue.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(it.unimi.dsi.fastutil.bytes.ByteComparator c)

Creates a new empty queue with a given comparator.

Parameters:

c - the comparator used in this queue, or null for the natural order.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue()

Creates a new empty queue using the natural order.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(byte[] a,
                              int size,
                              it.unimi.dsi.fastutil.bytes.ByteComparator c)

Wraps a given array in a queue using a given comparator.

The queue returned by this method will be backed by the given array.

Parameters:

a - an array.

size - the number of elements to be included in the queue.

c - the comparator used in this queue, or null for the natural order.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(byte[] a,
                              it.unimi.dsi.fastutil.bytes.ByteComparator c)

Wraps a given array in a queue using a given comparator.

The queue returned by this method will be backed by the given array.

Parameters:

a - an array.

c - the comparator used in this queue, or null for the natural order.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(byte[] a,
                              int size)

Wraps a given array in a queue using the natural order.

The queue returned by this method will be backed by the given array.

Parameters:

a - an array.

size - the number of elements to be included in the queue.

ByteArrayPriorityQueue

public ByteArrayPriorityQueue(byte[] a)

Wraps a given array in a queue using the natural order.

The queue returned by this method will be backed by the given array.

Parameters:

a - an array.

Method Detail

enqueue

public void enqueue(byte x)

Description copied from interface: BytePriorityQueue

Enqueues a new element.

Specified by:

enqueue in interface BytePriorityQueue

Parameters:

x - the element to enqueue.

See Also:

PriorityQueue.enqueue(Object)

dequeueByte

public byte dequeueByte()

Description copied from interface: BytePriorityQueue

Dequeues the first element from the queue.

Specified by:

dequeueByte in interface BytePriorityQueue

Returns:

the dequeued element.

See Also:

BytePriorityQueue.dequeue()

firstByte

public byte firstByte()

Description copied from interface: BytePriorityQueue

Returns the first element of the queue.

Specified by:

firstByte in interface BytePriorityQueue

Returns:

the first element.

See Also:

BytePriorityQueue.first()

changed

public void changed()

Specified by:

changed in interface it.unimi.dsi.fastutil.PriorityQueue<java.lang.Byte>

size

public int size()

Specified by:

size in interface it.unimi.dsi.fastutil.PriorityQueue<java.lang.Byte>

clear

public void clear()

Specified by:

clear in interface it.unimi.dsi.fastutil.PriorityQueue<java.lang.Byte>

trim

public void trim()

Trims the underlying array so that it has exactly size() elements.

comparator

public it.unimi.dsi.fastutil.bytes.ByteComparator comparator()

Description copied from interface: BytePriorityQueue

Returns the comparator associated with this priority queue, or null if it uses its elements' natural ordering.

Specified by:

comparator in interface BytePriorityQueue

Specified by:

comparator in interface it.unimi.dsi.fastutil.PriorityQueue<java.lang.Byte>

Returns:

the comparator associated with this priority queue.

See Also:

PriorityQueue.comparator()