cz.cuni.amis.utils.maps
Class WeakHashMapMap<PRIMARY_KEY,SECONDARY_KEY,ITEM>

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.WeakHashMap<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>
          cz.cuni.amis.utils.maps.WeakHashMapMap<PRIMARY_KEY,SECONDARY_KEY,ITEM>

Type Parameters:

PRIMARY_KEY -

SECONDARY_KEY -

ITEM -

All Implemented Interfaces:

java.util.Map<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>

public class WeakHashMapMap<PRIMARY_KEY,SECONDARY_KEY,ITEM>
extends java.util.WeakHashMap<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>

Two-level hashMap where the first-level keys are weakly referenced! This means that if the key is not strongly referenced elsewhere, the maps can be garbage collected.

Nested Class Summary

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

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

Constructor Summary

WeakHashMapMap()

Method Summary

java.util.Map<SECONDARY_KEY,ITEM>	get(java.lang.Object primaryKey)
ITEM	get(PRIMARY_KEY primaryKey, SECONDARY_KEY secondaryKey) Returns the requested item under primary and secondary key.
ITEM	put(PRIMARY_KEY primaryKey, SECONDARY_KEY secondaryKey, ITEM item) Inserts item under primary and secondary_key.
java.util.Map<SECONDARY_KEY,ITEM>	remove(java.lang.Object primaryKey) removes all items under primaryKey
ITEM	remove(PRIMARY_KEY primaryKey, SECONDARY_KEY secondaryKey) removes the item under primary and secondary key.

Methods inherited from class java.util.WeakHashMap

clear, containsKey, containsValue, entrySet, isEmpty, keySet, put, putAll, size, values

Methods inherited from class java.util.AbstractMap

clone, equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

WeakHashMapMap

public WeakHashMapMap()

Method Detail

get

public java.util.Map<SECONDARY_KEY,ITEM> get(java.lang.Object primaryKey)

Specified by:

get in interface java.util.Map<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>

Overrides:

get in class java.util.WeakHashMap<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>

get

public ITEM get(PRIMARY_KEY primaryKey,
                SECONDARY_KEY secondaryKey)

Returns the requested item under primary and secondary key.

Parameters:

primaryKey - weakly-referenced

secondaryKey -

Returns:

if no such item exists returns NULL

put

public ITEM put(PRIMARY_KEY primaryKey,
                SECONDARY_KEY secondaryKey,
                ITEM item)

Inserts item under primary and secondary_key.

Parameters:

primaryKey - weakly-referenced

secondaryKey -

item -

Returns:

inserted item

remove

public ITEM remove(PRIMARY_KEY primaryKey,
                   SECONDARY_KEY secondaryKey)

removes the item under primary and secondary key.

Parameters:

primaryKey -

secondaryKey -

Returns:

removed item

remove

public java.util.Map<SECONDARY_KEY,ITEM> remove(java.lang.Object primaryKey)

removes all items under primaryKey

Specified by:

remove in interface java.util.Map<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>

Overrides:

remove in class java.util.WeakHashMap<PRIMARY_KEY,java.util.Map<SECONDARY_KEY,ITEM>>

Parameters:

primaryKey -

Returns:

map of all removed items