Class LRUCache

java.lang.Object

java.util.AbstractMap

java.util.HashMap

java.util.LinkedHashMap

net.didion.jwnl.util.cache.LRUCache

All Implemented Interfaces:

Serializable, Cloneable, Map, Cache

Direct Known Subclasses:

AbstractCachingDictionary.ObservableCache

public class LRUCache
extends LinkedHashMap
implements Cache

A fixed-capacity Cache that stores the most recently used elements. Once the cache reaches capacity, the least recently used elements will be removed.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
private int	_capacity

Constructor Summary

Constructors

Constructor	Description
LRUCache(int capacity)

Method Summary

Modifier and Type	Method	Description
int	getCapacity()	Returns the maximum number of elements the cache can hold.
int	getSize()	Returns the current size of the cache.
boolean	isFull()
protected boolean	removeEldestEntry(Map.Entry eldest)
int	setCapacity(int capacity)	Set the maximum number of elements the cache can hold.

Methods inherited from class LinkedHashMap

clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, replaceAll, values

Methods inherited from class HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class AbstractMap

equals, hashCode, toString

Methods inherited from class Object

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

Methods inherited from interface Cache

clear, get, put, remove

Methods inherited from interface Map

compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Field Details

_capacity

private int _capacity

Constructor Details

LRUCache

public LRUCache(int capacity)

Parameters:

capacity - the maximum number of elements that can be contained in the cache.

Method Details

isFull

public boolean isFull()

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry eldest)

Overrides:

removeEldestEntry in class LinkedHashMap

setCapacity

public int setCapacity(int capacity)

Description copied from interface: Cache

Set the maximum number of elements the cache can hold.

Specified by:

setCapacity in interface Cache

getCapacity

public int getCapacity()

Description copied from interface: Cache

Returns the maximum number of elements the cache can hold.

Specified by:

getCapacity in interface Cache

getSize

public int getSize()

Description copied from interface: Cache

Returns the current size of the cache.

Specified by:

getSize in interface Cache