net.sf.saxon.sort
Class LRUCache

java.lang.Object
  net.sf.saxon.sort.LRUCache

public class LRUCache
extends Object

An LRU cache, based on LinkedHashMap. Synthesized and simplified from various published examples of the genre. The methods are not synchronized.

Constructor Summary

LRUCache(int cacheSize)
Creates a new LRU cache.

Method Summary

void	clear() Clear the cache
Object	get(Object key) Retrieves an entry from the cache. The retrieved entry becomes the most recently used entry.
void	put(Object key, Object value) Adds an entry to this cache.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LRUCache

public LRUCache(int cacheSize)

Creates a new LRU cache.

Parameters:

cacheSize - the maximum number of entries that will be kept in this cache.

Method Detail

get

public Object get(Object key)

Retrieves an entry from the cache.
The retrieved entry becomes the most recently used entry.

Parameters:

key - the key whose associated value is to be returned.

Returns:

the value associated to this key, or null if no value with this key exists in the cache.

put

public void put(Object key,
                Object value)

Adds an entry to this cache. If the cache is full, the LRU (least recently used) entry is dropped.

Parameters:

key - the key with which the specified value is to be associated.

value - a value to be associated with the specified key.

clear

public void clear()

Clear the cache