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java.lang.Objectedu.tum.cs.commons.collections.UnmodifiableMap<K,V>
public class UnmodifiableMap<K,V>
This is a wrapper for a Map
prohibiting all calls which would modify
its contents. As the construction of this class is performed in constant time
it is prefered over copying the map (which takes linear time). Using this
class is also preferred to using the unmodifiableX()
in class
Collections
as they return the collection base type that does not
signal, that the object ist unmodifiable. Using the classes in this package
makes unmodifiability more explicit.
All prohibited methods throw an UnsupportedOperationException
. The
class is nearly the same as the one returned by
Collections.unmodifiableMap(Map)
, but by making it a public class we
can make the return value of some methods more explicit.
This map is serializable if the wrapped map is serializable.
Nested Class Summary |
---|
Nested classes/interfaces inherited from interface java.util.Map |
---|
java.util.Map.Entry<K,V> |
Constructor Summary | |
---|---|
UnmodifiableMap(java.util.Map<K,V> m)
Creates a new unmodifiable map from another map. |
Method Summary | |
---|---|
void |
clear()
Operation is not supported. |
boolean |
containsKey(java.lang.Object key)
|
boolean |
containsValue(java.lang.Object value)
|
UnmodifiableSet<java.util.Map.Entry<K,V>> |
entrySet()
|
V |
get(java.lang.Object key)
|
boolean |
isEmpty()
|
UnmodifiableSet<K> |
keySet()
|
V |
put(K arg0,
V arg1)
Operation is not supported. |
void |
putAll(java.util.Map<? extends K,? extends V> arg0)
Operation is not supported. |
V |
remove(java.lang.Object arg0)
Operation is not supported. |
int |
size()
|
java.lang.String |
toString()
Returns a string representation of this map. |
UnmodifiableCollection<V> |
values()
|
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Map |
---|
equals, hashCode |
Constructor Detail |
---|
public UnmodifiableMap(java.util.Map<K,V> m)
Method Detail |
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public boolean isEmpty()
isEmpty
in interface java.util.Map<K,V>
public int size()
size
in interface java.util.Map<K,V>
public boolean containsKey(java.lang.Object key)
containsKey
in interface java.util.Map<K,V>
public boolean containsValue(java.lang.Object value)
containsValue
in interface java.util.Map<K,V>
public V get(java.lang.Object key)
get
in interface java.util.Map<K,V>
public UnmodifiableSet<K> keySet()
keySet
in interface java.util.Map<K,V>
public UnmodifiableCollection<V> values()
values
in interface java.util.Map<K,V>
public UnmodifiableSet<java.util.Map.Entry<K,V>> entrySet()
entrySet
in interface java.util.Map<K,V>
public void clear()
clear
in interface java.util.Map<K,V>
java.lang.UnsupportedOperationException
public V put(K arg0, V arg1)
put
in interface java.util.Map<K,V>
java.lang.UnsupportedOperationException
public void putAll(java.util.Map<? extends K,? extends V> arg0)
putAll
in interface java.util.Map<K,V>
java.lang.UnsupportedOperationException
public V remove(java.lang.Object arg0)
remove
in interface java.util.Map<K,V>
java.lang.UnsupportedOperationException
public java.lang.String toString()
toString
in class java.lang.Object
|
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