it.unimi.dsi.fastutil.objects
Class Reference2ObjectMaps.EmptyMap<K,V>

java.lang.Object
  extended by it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction<K,V>
      extended by it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.EmptyFunction<K,V>
          extended by it.unimi.dsi.fastutil.objects.Reference2ObjectMaps.EmptyMap<K,V>
All Implemented Interfaces:
Function<K,V>, Reference2ObjectFunction<K,V>, Reference2ObjectMap<K,V>, Serializable, Cloneable, Map<K,V>
Direct Known Subclasses:
Reference2ObjectSortedMaps.EmptySortedMap
Enclosing class:
Reference2ObjectMaps

public static class Reference2ObjectMaps.EmptyMap<K,V>
extends Reference2ObjectFunctions.EmptyFunction<K,V>
implements Reference2ObjectMap<K,V>, Serializable, Cloneable

An immutable class representing an empty type-specific map.

This class may be useful to implement your own in case you subclass a type-specific map.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectMap
Reference2ObjectMap.Entry<K,V>, Reference2ObjectMap.FastEntrySet<K,V>
 
Field Summary
static long serialVersionUID
           
 
Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction
defRetValue
 
Constructor Summary
protected Reference2ObjectMaps.EmptyMap()
           
 
Method Summary
 Object clone()
           
 boolean containsValue(Object v)
           
 ObjectSet<Map.Entry<K,V>> entrySet()
          Returns a set view of the mappings contained in this map.
 boolean equals(Object o)
           
 int hashCode()
           
 boolean isEmpty()
           
 ReferenceSet<K> keySet()
          Returns a set view of the keys contained in this map.
 void putAll(Map<? extends K,? extends V> m)
           
 ObjectSet<Reference2ObjectMap.Entry<K,V>> reference2ObjectEntrySet()
          Returns a type-specific set view of the mappings contained in this map.
 String toString()
           
 ObjectCollection<V> values()
          Returns a set view of the values contained in this map.
 
Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.EmptyFunction
clear, containsKey, defaultReturnValue, defaultReturnValue, get, size
 
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction
put, remove
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectFunction
defaultReturnValue, defaultReturnValue
 
Methods inherited from interface it.unimi.dsi.fastutil.Function
clear, containsKey, get, put, remove, size
 
Methods inherited from interface java.util.Map
clear, containsKey, get, put, remove, size
 

Field Detail

serialVersionUID

public static final long serialVersionUID
See Also:
Constant Field Values
Constructor Detail

Reference2ObjectMaps.EmptyMap

protected Reference2ObjectMaps.EmptyMap()
Method Detail

containsValue

public boolean containsValue(Object v)
Specified by:
containsValue in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)
Specified by:
putAll in interface Map<K,V>

reference2ObjectEntrySet

public ObjectSet<Reference2ObjectMap.Entry<K,V>> reference2ObjectEntrySet()
Description copied from interface: Reference2ObjectMap
Returns a type-specific set view of the mappings contained in this map.

This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Reference2ObjectMap.entrySet() so that it returns an ObjectSet of objects of type Reference2ObjectMap.Entry (the latter makes it possible to access keys and values with type-specific methods).

Specified by:
reference2ObjectEntrySet in interface Reference2ObjectMap<K,V>
Returns:
a type-specific set view of the mappings contained in this map.
See Also:
Reference2ObjectMap.entrySet()

keySet

public ReferenceSet<K> keySet()
Description copied from interface: Reference2ObjectMap
Returns a set view of the keys contained in this map.

Note that this specification strengthens the one given in Map.keySet().

Specified by:
keySet in interface Reference2ObjectMap<K,V>
Specified by:
keySet in interface Map<K,V>
Returns:
a set view of the keys contained in this map.
See Also:
Map.keySet()

values

public ObjectCollection<V> values()
Description copied from interface: Reference2ObjectMap
Returns a set view of the values contained in this map.

Note that this specification strengthens the one given in Map.values().

Specified by:
values in interface Reference2ObjectMap<K,V>
Specified by:
values in interface Map<K,V>
Returns:
a set view of the values contained in this map.
See Also:
Map.values()

clone

public Object clone()
Overrides:
clone in class Reference2ObjectFunctions.EmptyFunction<K,V>

isEmpty

public boolean isEmpty()
Specified by:
isEmpty in interface Map<K,V>

entrySet

public ObjectSet<Map.Entry<K,V>> entrySet()
Description copied from interface: Reference2ObjectMap
Returns a set view of the mappings contained in this map.

Note that this specification strengthens the one given in Map.entrySet().

Specified by:
entrySet in interface Reference2ObjectMap<K,V>
Specified by:
entrySet in interface Map<K,V>
Returns:
a set view of the mappings contained in this map.
See Also:
Map.entrySet()

hashCode

public int hashCode()
Specified by:
hashCode in interface Map<K,V>
Overrides:
hashCode in class Object

equals

public boolean equals(Object o)
Specified by:
equals in interface Map<K,V>
Overrides:
equals in class Object

toString

public String toString()
Overrides:
toString in class Object


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