cz.cuni.amis.utils.maps
Class AbstractLazyMap<KEY,VALUE>

java.lang.Object
  cz.cuni.amis.utils.maps.AbstractLazyMap<KEY,VALUE>

Type Parameters:

KEY - KeyType

VALUE - ValueType

All Implemented Interfaces:

Map<KEY,VALUE>

public abstract class AbstractLazyMap<KEY,VALUE>
extends Object
implements Map<KEY,VALUE>

Abstract implementation of a lazy map. The values are created on-demand by the create method if they are not cached already. The keySet is kept updated however, only the values are lazy-generated. If you need to iterate over the map, but you don't actually need all the values, iterate over the keySet.

Author:

srlok

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

AbstractLazyMap()

AbstractLazyMap(Map<KEY,VALUE> baseMap)

AbstractLazyMap(Set<KEY> entryKeySet)

Method Summary

void	addKey(KEY key)
void	clear()
void	clearCache() manually clears the cached objects
boolean	containsKey(Object key)
boolean	containsValue(Object value)
protected abstract VALUE	create(Object key) Creates the Mapped object based on its key.
Set<Map.Entry<KEY,VALUE>>	entrySet()
VALUE	get(Object key)
boolean	isEmpty()
Set<KEY>	keySet()
VALUE	put(KEY key, VALUE value)
void	putAll(Map<? extends KEY,? extends VALUE> m)
VALUE	remove(Object key)
void	setKeySet(Set<KEY> newKeySet)
int	size()
Collection<VALUE>	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

AbstractLazyMap

public AbstractLazyMap()

AbstractLazyMap

public AbstractLazyMap(Set<KEY> entryKeySet)

AbstractLazyMap

public AbstractLazyMap(Map<KEY,VALUE> baseMap)

Method Detail

create

protected abstract VALUE create(Object key)

Creates the Mapped object based on its key. Every LazyMap must implement this.

Parameters:

key -

Returns:

addKey

public void addKey(KEY key)

clear

public void clear()

Specified by:

clear in interface Map<KEY,VALUE>

clearCache

public void clearCache()

manually clears the cached objects

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<KEY,VALUE>

setKeySet

public void setKeySet(Set<KEY> newKeySet)

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<KEY,VALUE>

entrySet

public Set<Map.Entry<KEY,VALUE>> entrySet()

Specified by:

entrySet in interface Map<KEY,VALUE>

get

public VALUE get(Object key)

Specified by:

get in interface Map<KEY,VALUE>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<KEY,VALUE>

keySet

public Set<KEY> keySet()

Specified by:

keySet in interface Map<KEY,VALUE>

put

public VALUE put(KEY key,
                 VALUE value)

Specified by:

put in interface Map<KEY,VALUE>

putAll

public void putAll(Map<? extends KEY,? extends VALUE> m)

Specified by:

putAll in interface Map<KEY,VALUE>

remove

public VALUE remove(Object key)

Specified by:

remove in interface Map<KEY,VALUE>

size

public int size()

Specified by:

size in interface Map<KEY,VALUE>

values

public Collection<VALUE> values()

Specified by:

values in interface Map<KEY,VALUE>