com.opera.core.systems.util
Class StackHashMap<K,V>

java.lang.Object
  com.opera.core.systems.util.StackHashMap<K,V>

Type Parameters:

K -

V -

All Implemented Interfaces:

ConcurrentMap<K,V>, Map<K,V>

public class StackHashMap<K,V>
extends Object
implements ConcurrentMap<K,V>

A thread safe stack hash map for use in window manager The backing map is a LinkedHashMap that provides predictable iteration order. All the operations that require thread safety are protected by the lock of synchronized map.

Author:

Deniz Turkoglu

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

StackHashMap()

Method Summary

Map<K,V>	asMap()
List<K>	asStack()
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()
V	peek()
K	peekKey()
V	pop() Removes the first value from the map
V	push(K k, V v)
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> t)
V	putIfAbsent(K k, V v) Puts a key to top of the map if absent if the key is present in stack it is removed
V	remove(Object key)
boolean	remove(Object key, Object value)
V	replace(K key, V value)
boolean	replace(K key, V oldValue, V newValue)
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

StackHashMap

public StackHashMap()

Method Detail

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>

get

public V get(Object key)

Specified by:

get 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> t)

Specified by:

putAll in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

entrySet

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

Specified by:

entrySet in interface Map<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

pop

public V pop()

Removes the first value from the map

Returns:

the value that was removed

push

public V push(K k,
              V v)

peek

public V peek()

Returns:

the first value in the backing map

peekKey

public K peekKey()

Returns:

the first key in the backing linked list

asStack

public List<K> asStack()

Returns:

an unmodifiable copy of the backing linkedlist(used as a stack)

asMap

public Map<K,V> asMap()

Returns:

an unmodifiable copy of the backing map

putIfAbsent

public V putIfAbsent(K k,
                     V v)

Puts a key to top of the map if absent if the key is present in stack it is removed

Specified by:

putIfAbsent in interface ConcurrentMap<K,V>

Parameters:

k -

v -

Returns:

the value if it is not contained, null otherwise

remove

public boolean remove(Object key,
                      Object value)

Specified by:

remove in interface ConcurrentMap<K,V>

replace

public boolean replace(K key,
                       V oldValue,
                       V newValue)

Specified by:

replace in interface ConcurrentMap<K,V>

replace

public V replace(K key,
                 V value)

Specified by:

replace in interface ConcurrentMap<K,V>