org.mini2Dx.core.collections.concurrent

Class ConcurrentIntQueue

java.lang.Object

org.mini2Dx.core.collections.IntQueue

org.mini2Dx.core.collections.concurrent.ConcurrentIntQueue

All Implemented Interfaces:

ConcurrentCollection

public class ConcurrentIntQueue
extends IntQueue
implements ConcurrentCollection

Nested Class Summary

Nested classes/interfaces inherited from class org.mini2Dx.core.collections.IntQueue

IntQueue.IntQueueIterable, IntQueue.IntQueueIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected ReadWriteLock	lock

Fields inherited from class org.mini2Dx.core.collections.IntQueue

head, size, tail, values

Constructor Summary

Constructors

Constructor and Description
ConcurrentIntQueue() Creates a new Queue which can hold 16 values without needing to resize backing array.
ConcurrentIntQueue(int initialSize) Creates a new Queue which can hold the specified number of values without needing to resize backing array.

Method Summary

Modifier and Type	Method and Description
void	addFirst(int object) Prepend given object to the head.
void	addLast(int object) Append given object to the tail.
void	clear() Removes all values from this queue.
void	ensureCapacity(int additional) Increases the size of the backing array to accommodate the specified number of additional items.
boolean	equals(java.lang.Object object)
int	first() Returns the first (head) item in the queue (without removing it).
int	get(int index) Retrieves the value in queue without removing it.
ReadWriteLock	getLock() Returns the collection's ReadWriteLock
int	hashCode()
int	indexOf(int value) Returns the index of first occurrence of value in the queue, or -1 if no such value exists.
boolean	isEmpty() Returns true if the queue is empty.
java.util.Iterator<java.lang.Integer>	iterator() Returns an iterator for the items in the queue.
int	last() Returns the last (tail) item in the queue (without removing it).
boolean	notEmpty() Returns true if the queue has one or more items.
int	removeFirst() Remove the first item from the queue.
int	removeIndex(int index) Removes and returns the item at the specified index.
int	removeLast() Remove the last item from the queue.
boolean	removeValue(int value) Removes the first instance of the specified value in the queue.
java.lang.String	toString()
java.lang.String	toString(java.lang.String separator)

Methods inherited from class org.mini2Dx.core.collections.IntQueue

resize

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

lock

protected ReadWriteLock lock

Constructor Detail

ConcurrentIntQueue

public ConcurrentIntQueue()

Creates a new Queue which can hold 16 values without needing to resize backing array.

ConcurrentIntQueue

public ConcurrentIntQueue(int initialSize)

Creates a new Queue which can hold the specified number of values without needing to resize backing array.

Parameters:

initialSize -

Method Detail

addLast

public void addLast(int object)

Append given object to the tail. (enqueue to tail) Unless backing array needs resizing, operates in O(1) time.

Overrides:

addLast in class IntQueue

Parameters:

object - can be null

addFirst

public void addFirst(int object)

Prepend given object to the head. (enqueue to head) Unless backing array needs resizing, operates in O(1) time.

Overrides:

addFirst in class IntQueue

Parameters:

object - can be null

See Also:

addLast(int)

ensureCapacity

public void ensureCapacity(int additional)

Increases the size of the backing array to accommodate the specified number of additional items. Useful before adding many items to avoid multiple backing array resizes.

Overrides:

ensureCapacity in class IntQueue

Parameters:

additional -

removeFirst

public int removeFirst()

Remove the first item from the queue. (dequeue from head) Always O(1).

Overrides:

removeFirst in class IntQueue

Returns:

removed object

Throws:

java.util.NoSuchElementException - when queue is empty

removeLast

public int removeLast()

Remove the last item from the queue. (dequeue from tail) Always O(1).

Overrides:

removeLast in class IntQueue

Returns:

removed object

Throws:

java.util.NoSuchElementException - when queue is empty

See Also:

removeFirst()

indexOf

public int indexOf(int value)

Returns the index of first occurrence of value in the queue, or -1 if no such value exists.

Overrides:

indexOf in class IntQueue

Parameters:

value -

Returns:

An index of first occurrence of value in queue or -1 if no such value exists

removeValue

public boolean removeValue(int value)

Removes the first instance of the specified value in the queue.

Overrides:

removeValue in class IntQueue

Parameters:

value -

Returns:

true if value was found and removed, false otherwise

removeIndex

public int removeIndex(int index)

Removes and returns the item at the specified index.

Overrides:

removeIndex in class IntQueue

Parameters:

index -

notEmpty

public boolean notEmpty()

Returns true if the queue has one or more items.

Overrides:

notEmpty in class IntQueue

isEmpty

public boolean isEmpty()

Returns true if the queue is empty.

Overrides:

isEmpty in class IntQueue

first

public int first()

Returns the first (head) item in the queue (without removing it).

Overrides:

first in class IntQueue

Throws:

java.util.NoSuchElementException - when queue is empty

See Also:

addFirst(int), removeFirst()

last

public int last()

Returns the last (tail) item in the queue (without removing it).

Overrides:

last in class IntQueue

Throws:

java.util.NoSuchElementException - when queue is empty

See Also:

addLast(int), removeLast()

get

public int get(int index)

Retrieves the value in queue without removing it. Indexing is from the front to back, zero based. Therefore get(0) is the same as first().

Overrides:

get in class IntQueue

Parameters:

index -

Throws:

java.lang.IndexOutOfBoundsException - when the index is negative or greater or equal than size

clear

public void clear()

Removes all values from this queue. Values in backing array are set to null to prevent memory leak, so this operates in O(n).

Overrides:

clear in class IntQueue

iterator

public java.util.Iterator<java.lang.Integer> iterator()

Returns an iterator for the items in the queue. Remove is supported.

Overrides:

iterator in class IntQueue

hashCode

public int hashCode()

Overrides:

hashCode in class IntQueue

equals

public boolean equals(java.lang.Object object)

Overrides:

equals in class IntQueue

toString

public java.lang.String toString()

Overrides:

toString in class IntQueue

toString

public java.lang.String toString(java.lang.String separator)

Overrides:

toString in class IntQueue

getLock

public ReadWriteLock getLock()

Description copied from interface: ConcurrentCollection

Returns the collection's ReadWriteLock

Specified by:

getLock in interface ConcurrentCollection

Returns:

the collection's ReadWriteLock