edu.mit.ai.psg.utilities
Class HashMapCache

java.lang.Object
  |
  +--java.util.AbstractMap
        |
        +--java.util.WeakHashMap
              |
              +--edu.mit.ai.psg.utilities.HashMapCache

public class HashMapCache

extends WeakHashMap

HashMapCache is a Map which keeps references to values as java.lang.ref.SoftReferences, and removes entries after values are garbage collected. Since it is a WeakHashMap, entries are also removed after keys are garbage collected. Supports null keys and null values.

Inner Class Summary

protected static class	HashMapCache.Entry
protected class	HashMapCache.EntrySet

Constructor Summary

HashMapCache()

HashMapCache(int initialCapacity)

HashMapCache(int initialCapacity, float loadFactor)

Method Summary

Set	entrySet()
Object	get(Object key)
Object	put(Object key, Object value)

Methods inherited from class java.util.WeakHashMap

clear, containsKey, isEmpty, remove, size

Methods inherited from class java.util.AbstractMap

containsValue, equals, hashCode, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

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

Constructor Detail

HashMapCache

public HashMapCache()

HashMapCache

public HashMapCache(int initialCapacity)

HashMapCache

public HashMapCache(int initialCapacity,
                    float loadFactor)

Method Detail

put

public Object put(Object key,
                  Object value)

Overrides:

put in class WeakHashMap

get

public Object get(Object key)

Overrides:

get in class WeakHashMap

entrySet

public Set entrySet()

Overrides:

entrySet in class WeakHashMap