com.codename1.ui.util

Class WeakHashMap<K,V>

java.lang.Object

com.codename1.ui.util.WeakHashMap<K,V>

All Implemented Interfaces:

Map<K,V>

public class WeakHashMap<K,V>
extends Object
implements Map<K,V>

Helper weak hash map substitute

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
WeakHashMap()

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all elements from this Map, leaving it empty.
boolean	containsKey(Object key) Returns whether this Map contains the specified key.
boolean	containsValue(Object value) This method is unsupported in the weak hash map
Set<Map.Entry<K,V>>	entrySet() Unsupported operation
V	get(Object key) Returns the value of the mapping with the specified key.
boolean	isEmpty() Returns whether this map is empty.
Set<K>	keySet() Returns a set of the keys contained in this Map.
V	put(K key, V value) Maps the specified key to the specified value.
void	putAll(Map<? extends K,? extends V> m) Copies every mapping in the specified Map to this Map.
V	remove(Object key) Removes a mapping with the specified key from this Map.
int	size() Returns the number of mappings in this Map.
Collection<V>	values() Unsupported operation

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

WeakHashMap

public WeakHashMap()

Method Detail

size

public int size()

Returns the number of mappings in this Map.

Specified by:

size in interface Map<K,V>

Returns:

the number of mappings in this Map.

isEmpty

public boolean isEmpty()

Returns whether this map is empty.

Specified by:

isEmpty in interface Map<K,V>

Returns:

true if this map has no elements, false otherwise.

See Also:

Map.size()

containsKey

public boolean containsKey(Object key)

Returns whether this Map contains the specified key.

Specified by:

containsKey in interface Map<K,V>

Parameters:

key - the key to search for.

Returns:

true if this map contains the specified key, false otherwise.

containsValue

public boolean containsValue(Object value)

This method is unsupported in the weak hash map

Specified by:

containsValue in interface Map<K,V>

Parameters:

value - the value to search for.

Returns:

true if this map contains the specified value, false otherwise.

get

public V get(Object key)

Returns the value of the mapping with the specified key.

Specified by:

get in interface Map<K,V>

Parameters:

key - the key.

Returns:

the value of the mapping with the specified key, or null if no mapping for the specified key is found.

put

public V put(K key,
             V value)

Maps the specified key to the specified value.

Specified by:

put in interface Map<K,V>

Parameters:

key - the key.

value - the value.

Returns:

the value of any previous mapping with the specified key or null if there was no mapping.

remove

public V remove(Object key)

Removes a mapping with the specified key from this Map.

Specified by:

remove in interface Map<K,V>

Parameters:

key - the key of the mapping to remove.

Returns:

the value of the removed mapping or null if no mapping for the specified key was found.

putAll

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

Copies every mapping in the specified Map to this Map.

Specified by:

putAll in interface Map<K,V>

Parameters:

m - the Map to copy mappings from.

clear

public void clear()

Removes all elements from this Map, leaving it empty.

Specified by:

clear in interface Map<K,V>

See Also:

Map.isEmpty(), Map.size()

keySet

public Set<K> keySet()

Returns a set of the keys contained in this Map. The Set is backed by this Map so changes to one are reflected by the other. The Set does not support adding.

Specified by:

keySet in interface Map<K,V>

Returns:

a set of the keys.

values

public Collection<V> values()

Unsupported operation

Specified by:

values in interface Map<K,V>

Returns:

a collection of the values contained in this map.

entrySet

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

Unsupported operation

Specified by:

entrySet in interface Map<K,V>

Returns:

a set of the mappings