edu.tum.cs.commons.collections
Class HybridMapBase<K,V>

java.lang.Object
  edu.tum.cs.commons.collections.HybridMapBase<K,V>

All Implemented Interfaces:

Map<K,V>

Direct Known Subclasses:

MemoryEfficientStringMap

public abstract class HybridMapBase<K,V>
extends Object
implements Map<K,V>

A hybrid map is a map which starts with one map implementation, but switches to another one after a certain size is reached.

Version:

$Rev: 29399 $

Author:

hummelb, $Author: juergens $

Rating:

GREEN Hash: 8464B0259DB7F1270D62FF135895F9FC

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

protected

HybridMapBase(Map<K,V> initialMap) Constructor.

Method Summary

void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
boolean	isEmpty()
Set<K>	keySet()
protected abstract Map<K,V>	obtainNewMap() Template method for obtaining a new map implementation after shouldSwitch(Map) returned true.
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object key)
protected abstract boolean	shouldSwitch(Map<K,V> map) Template method for deciding that a switch of map implementation should be performed before the next insertion.
int	size()
Collection<V>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

HybridMapBase

protected HybridMapBase(Map<K,V> initialMap)

Constructor.

Method Detail

shouldSwitch

protected abstract boolean shouldSwitch(Map<K,V> map)

Template method for deciding that a switch of map implementation should be performed before the next insertion. This will be called right before each put operation. If this returns true, the new map implementation is obtained via obtainNewMap() and all values are copied.

Parameters:

map - the currently used map.

obtainNewMap

protected abstract Map<K,V> obtainNewMap()

Template method for obtaining a new map implementation after shouldSwitch(Map) returned true.

clear

public void clear()

Specified by:

clear in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>