com.im.df.util
Class CachingMap<K,V>

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.HashMap<K,V>
          java.util.LinkedHashMap<K,V>
              com.im.df.util.CachingMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class CachingMap<K,V>
extends LinkedHashMap<K,V>

The map that acts as LRU cache. The cache is kept to a maximum size by removing the eldest entries when the list size exceeds the value of cache size (see CachingMap(int)). Eldest entries are those least recently accessed.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

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

Constructor Summary

CachingMap(int cacheSize)

Method Summary

int	getCacheSize()
protected boolean	removeEldestEntry(Map.Entry<K,V> eldest)
void	setCacheSize(int cacheSize)
void	setPermanentItemKey(K key)

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, get

Methods inherited from class java.util.HashMap

clone, containsKey, entrySet, isEmpty, keySet, put, putAll, remove, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

containsKey, entrySet, equals, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Constructor Detail

CachingMap

public CachingMap(int cacheSize)

Parameters:

cacheSize - maximum number of entries allowed in this cache

Method Detail

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<K,V> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>

getCacheSize

public int getCacheSize()

setCacheSize

public void setCacheSize(int cacheSize)

setPermanentItemKey

public void setPermanentItemKey(K key)