it.unimi.dsi.fastutil.objects
Class Reference2ReferenceMaps.EmptyMap<K,V>

java.lang.Object
  extended by it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,V>
      extended by it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.EmptyFunction<K,V>
          extended by it.unimi.dsi.fastutil.objects.Reference2ReferenceMaps.EmptyMap<K,V>
All Implemented Interfaces:
Function<K,V>, Reference2ReferenceFunction<K,V>, Reference2ReferenceMap<K,V>, java.io.Serializable, java.lang.Cloneable, java.util.Map<K,V>
Direct Known Subclasses:
Reference2ReferenceSortedMaps.EmptySortedMap
Enclosing class:
Reference2ReferenceMaps

public static class Reference2ReferenceMaps.EmptyMap<K,V>
extends Reference2ReferenceFunctions.EmptyFunction<K,V>
implements Reference2ReferenceMap<K,V>, java.io.Serializable, java.lang.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.Reference2ReferenceMap
Reference2ReferenceMap.Entry<K,V>, Reference2ReferenceMap.FastEntrySet<K,V>
 
Field Summary
static long serialVersionUID
           
 
Method Summary
 java.lang.Object clone()
           
 boolean containsValue(java.lang.Object v)
           
 ObjectSet<java.util.Map.Entry<K,V>> entrySet()
          Returns a set view of the mappings contained in this map.
 boolean equals(java.lang.Object o)
           
 int hashCode()
           
 boolean isEmpty()
           
 ReferenceSet<K> keySet()
          Returns a set view of the keys contained in this map.
 void putAll(java.util.Map<? extends K,? extends V> m)
           
 ObjectSet<Reference2ReferenceMap.Entry<K,V>> reference2ReferenceEntrySet()
          Returns a type-specific set view of the mappings contained in this map.
 java.lang.String toString()
           
 ReferenceCollection<V> values()
          Returns a set view of the values contained in this map.
 
Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.EmptyFunction
clear, containsKey, defaultReturnValue, defaultReturnValue, get, size
 
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction
put, remove
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceFunction
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
Method Detail

containsValue

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

putAll

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

reference2ReferenceEntrySet

public ObjectSet<Reference2ReferenceMap.Entry<K,V>> reference2ReferenceEntrySet()
Description copied from interface: Reference2ReferenceMap
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 Reference2ReferenceMap.entrySet() so that it returns an ObjectSet of objects of type Reference2ReferenceMap.Entry (the latter makes it possible to access keys and values with type-specific methods).

Specified by:
reference2ReferenceEntrySet in interface Reference2ReferenceMap<K,V>
Returns:
a type-specific set view of the mappings contained in this map.
See Also:
Reference2ReferenceMap.entrySet()

keySet

public ReferenceSet<K> keySet()
Description copied from interface: Reference2ReferenceMap
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 Reference2ReferenceMap<K,V>
Specified by:
keySet in interface java.util.Map<K,V>
Returns:
a set view of the keys contained in this map.
See Also:
Map.keySet()

values

public ReferenceCollection<V> values()
Description copied from interface: Reference2ReferenceMap
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 Reference2ReferenceMap<K,V>
Specified by:
values in interface java.util.Map<K,V>
Returns:
a set view of the values contained in this map.
See Also:
Map.values()

clone

public java.lang.Object clone()
Overrides:
clone in class Reference2ReferenceFunctions.EmptyFunction<K,V>

isEmpty

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

entrySet

public ObjectSet<java.util.Map.Entry<K,V>> entrySet()
Description copied from interface: Reference2ReferenceMap
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 Reference2ReferenceMap<K,V>
Specified by:
entrySet in interface java.util.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 java.util.Map<K,V>
Overrides:
hashCode in class java.lang.Object

equals

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

toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object