public class CopyOnWriteMap<K,V> extends Object implements Map<K,V>, Cloneable
Map
in which all operations that change the
Map are implemented by making a new copy of the underlying Map.
While the creation of a new Map can be expensive, this class is designed for
cases in which the primary function is to read data from the Map, not to
modify the Map. Therefore the operations that do not cause a change to this
class happen quickly and concurrently.Constructor and Description |
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CopyOnWriteMap()
Creates a new instance of CopyOnWriteMap.
|
CopyOnWriteMap(int initialCapacity)
Creates a new instance of CopyOnWriteMap with the specified initial size
|
CopyOnWriteMap(Map<K,V> data)
Creates a new instance of CopyOnWriteMap in which the
initial data being held by this map is contained in
the supplied map.
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Modifier and Type | Method and Description |
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void |
clear()
Removes all entries in this map.
|
Object |
clone() |
boolean |
containsKey(Object key)
Returns true if this map contains the provided key, otherwise
this method return false.
|
boolean |
containsValue(Object value)
Returns true if this map contains the provided value, otherwise
this method returns false.
|
Set<Map.Entry<K,V>> |
entrySet()
This method will return a read-only
Set . |
V |
get(Object key)
Returns the value associated with the provided key from this
map.
|
boolean |
isEmpty()
Returns true if this map is empty, otherwise false.
|
Set<K> |
keySet()
This method will return a read-only
Set . |
V |
put(K key,
V value)
Adds the provided key and value to this map.
|
void |
putAll(Map<? extends K,? extends V> newData)
Inserts all the keys and values contained in the
provided map to this map.
|
V |
remove(Object key)
Removed the value and key from this map based on the
provided key.
|
int |
size()
Returns the number of key/value pairs in this map.
|
Collection<V> |
values()
This method will return a read-only
Collection . |
public CopyOnWriteMap()
public CopyOnWriteMap(int initialCapacity)
initialCapacity
- The initial size of the Map.public V put(K key, V value)
put
in interface Map<K,V>
Map.put(java.lang.Object, java.lang.Object)
public V remove(Object key)
remove
in interface Map<K,V>
Map.remove(java.lang.Object)
public void putAll(Map<? extends K,? extends V> newData)
putAll
in interface Map<K,V>
Map.putAll(java.util.Map)
public void clear()
clear
in interface Map<K,V>
Map.clear()
public int size()
size
in interface Map<K,V>
Map.size()
public boolean isEmpty()
isEmpty
in interface Map<K,V>
Map.isEmpty()
public boolean containsKey(Object key)
containsKey
in interface Map<K,V>
Map.containsKey(java.lang.Object)
public boolean containsValue(Object value)
containsValue
in interface Map<K,V>
Map.containsValue(java.lang.Object)
public V get(Object key)
get
in interface Map<K,V>
Map.get(java.lang.Object)
public Collection<V> values()
Collection
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