com.miginfocom.util
Class MRUSoftCacheMap

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.HashMap<K,V>
          java.util.LinkedHashMap
              com.miginfocom.util.MRUSoftCacheMap

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map

public class MRUSoftCacheMap
extends java.util.LinkedHashMap

Generic implementation of an access-order MRU-map that holds all values in SoftReferences.
Some methods, mostly those which returns a collection that this class can't filter, throws an UnsupportedOperationException.
Having the refenence in a SoftReference means it will go away of memory gets low in the virtual machine. It is therefore used as a cache for objects that is good to have around but should be garbage collected to avoid out-of-memory problems.

See Also:

Serialized Form

Constructor Summary

MRUSoftCacheMap(int maxCount, boolean accessOrder)

Method Summary

boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value) Not supported! Throws UnsupportedOperationException
java.util.Set	entrySet() Not supported! Throws UnsupportedOperationException
protected void	flushEmptyRefs() Checks all references and deletes those entries which has no referring object.
java.lang.Object	get(java.lang.Object key)
boolean	isEmpty() Not supported! Throws UnsupportedOperationException
java.util.Set	keySet() Not supported! Throws UnsupportedOperationException
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
boolean	removeEldestEntry(java.util.Map.Entry entry)
int	size()
java.lang.String	toString()
java.util.Collection	values() Not supported! Throws UnsupportedOperationException

Methods inherited from class java.util.LinkedHashMap

clear

Methods inherited from class java.util.HashMap

clone, putAll, remove

Methods inherited from class java.util.AbstractMap

equals, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode, putAll, remove

Constructor Detail

MRUSoftCacheMap

public MRUSoftCacheMap(int maxCount,
                       boolean accessOrder)

Method Detail

removeEldestEntry

public boolean removeEldestEntry(java.util.Map.Entry entry)

Overrides:

removeEldestEntry in class java.util.LinkedHashMap

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.HashMap

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map

Overrides:

containsKey in class java.util.HashMap

get

public java.lang.Object get(java.lang.Object key)

Specified by:

get in interface java.util.Map

Overrides:

get in class java.util.LinkedHashMap

flushEmptyRefs

protected void flushEmptyRefs()

Checks all references and deletes those entries which has no referring object.

containsValue

public boolean containsValue(java.lang.Object value)

Not supported! Throws UnsupportedOperationException

Specified by:

containsValue in interface java.util.Map

Overrides:

containsValue in class java.util.LinkedHashMap

entrySet

public java.util.Set entrySet()

Not supported! Throws UnsupportedOperationException

Specified by:

entrySet in interface java.util.Map

Overrides:

entrySet in class java.util.HashMap

keySet

public java.util.Set keySet()

Not supported! Throws UnsupportedOperationException

Specified by:

keySet in interface java.util.Map

Overrides:

keySet in class java.util.HashMap

values

public java.util.Collection values()

Not supported! Throws UnsupportedOperationException

Specified by:

values in interface java.util.Map

Overrides:

values in class java.util.HashMap

isEmpty

public boolean isEmpty()

Not supported! Throws UnsupportedOperationException

Specified by:

isEmpty in interface java.util.Map

Overrides:

isEmpty in class java.util.HashMap

size

public int size()

Specified by:

size in interface java.util.Map

Overrides:

size in class java.util.HashMap

toString

public java.lang.String toString()

Overrides:

toString in class java.util.AbstractMap