com.hazelcast.util

Class ItemCounter<T>

java.lang.Object

com.hazelcast.util.ItemCounter<T>

Type Parameters:

T -

public final class ItemCounter<T>
extends Object

Non Thread-Safe Counter of things. It allows to count items without worrying about nulls.

Constructor Summary

Constructors

Constructor and Description
ItemCounter()

Method Summary

Modifier and Type	Method and Description
void	add(T item, long delta) Add delta to the item
void	clear() Clears the counter.
List<T>	descendingKeys() Returns a List of keys in descending value order.
boolean	equals(Object o)
long	get(T item) Get current counter for an item item
long	getAndSet(T item, long value) Set counter for item and return previous value
int	hashCode()
void	inc(T item) Increases the count by on for the given item.
Set<T>	keySet() Returns an iterator over all keys.
void	remove(T item)
void	reset() Reset state of the counter to 0.
void	set(T item, long value) Set counter of item to value
String	toString()
long	total() Returns the total counts.

Methods inherited from class java.lang.Object

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

Constructor Detail

ItemCounter

public ItemCounter()

Method Detail

total

public long total()

Returns the total counts. Complexity is O(1).

Returns:

total count.

keySet

public Set<T> keySet()

Returns an iterator over all keys.

Returns:

the key iterator.

descendingKeys

public List<T> descendingKeys()

Returns a List of keys in descending value order.

Returns:

the list of keys

get

public long get(T item)

Get current counter for an item item

Parameters:

item -

Returns:

current state of a counter for item

set

public void set(T item,
                long value)

Set counter of item to value

Parameters:

item - to set set the value for

value - a new value

inc

public void inc(T item)

Increases the count by on for the given item.

Parameters:

item -

add

public void add(T item,
                long delta)

Add delta to the item

Parameters:

item -

delta -

reset

public void reset()

Reset state of the counter to 0. It will NOT necessary remove all data referenced. Time complexity of this operation is O(n) where n is number of items.

clear

public void clear()

Clears the counter.

getAndSet

public long getAndSet(T item,
                      long value)

Set counter for item and return previous value

Parameters:

item -

value -

Returns:

remove

public void remove(T item)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object