it.unimi.dsi.fastutil.objects
Class Reference2LongMaps.EmptyMap<K>

java.lang.Object
  extended by it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction<K>
      extended by it.unimi.dsi.fastutil.objects.Reference2LongFunctions.EmptyFunction<K>
          extended by it.unimi.dsi.fastutil.objects.Reference2LongMaps.EmptyMap<K>
All Implemented Interfaces:
Function<K,Long>, Reference2LongFunction<K>, Reference2LongMap<K>, Serializable, Cloneable, Map<K,Long>
Direct Known Subclasses:
Reference2LongSortedMaps.EmptySortedMap
Enclosing class:
Reference2LongMaps

public static class Reference2LongMaps.EmptyMap<K>
extends Reference2LongFunctions.EmptyFunction<K>
implements Reference2LongMap<K>, 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.Reference2LongMap
Reference2LongMap.Entry<K>, Reference2LongMap.FastEntrySet<K>
 
Field Summary
static long serialVersionUID
           
 
Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction
defRetValue
 
Constructor Summary
protected Reference2LongMaps.EmptyMap()
           
 
Method Summary
 Object clone()
           
 boolean containsValue(long v)
           
 boolean containsValue(Object ov)
           
 ObjectSet<Map.Entry<K,Long>> 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 Long> m)
           
 ObjectSet<Reference2LongMap.Entry<K>> reference2LongEntrySet()
          Returns a type-specific set view of the mappings contained in this map.
 String toString()
           
 LongCollection values()
          Returns a set view of the values contained in this map.
 
Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2LongFunctions.EmptyFunction
clear, containsKey, defaultReturnValue, defaultReturnValue, getLong, size
 
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction
get, put, put, remove, removeLong
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongFunction
defaultReturnValue, defaultReturnValue, getLong, put, removeLong
 
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

Reference2LongMaps.EmptyMap

protected Reference2LongMaps.EmptyMap()
Method Detail

containsValue

public boolean containsValue(long v)
Specified by:
containsValue in interface Reference2LongMap<K>
See Also:
Map.containsValue(Object)

putAll

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

reference2LongEntrySet

public ObjectSet<Reference2LongMap.Entry<K>> reference2LongEntrySet()
Description copied from interface: Reference2LongMap
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 Reference2LongMap.entrySet() so that it returns an ObjectSet of objects of type Reference2LongMap.Entry (the latter makes it possible to access keys and values with type-specific methods).

Specified by:
reference2LongEntrySet in interface Reference2LongMap<K>
Returns:
a type-specific set view of the mappings contained in this map.
See Also:
Reference2LongMap.entrySet()

keySet

public ReferenceSet<K> keySet()
Description copied from interface: Reference2LongMap
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 Reference2LongMap<K>
Specified by:
keySet in interface Map<K,Long>
Returns:
a set view of the keys contained in this map.
See Also:
Map.keySet()

values

public LongCollection values()
Description copied from interface: Reference2LongMap
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 Reference2LongMap<K>
Specified by:
values in interface Map<K,Long>
Returns:
a set view of the values contained in this map.
See Also:
Map.values()

containsValue

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

clone

public Object clone()
Overrides:
clone in class Reference2LongFunctions.EmptyFunction<K>

isEmpty

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

entrySet

public ObjectSet<Map.Entry<K,Long>> entrySet()
Description copied from interface: Reference2LongMap
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 Reference2LongMap<K>
Specified by:
entrySet in interface Map<K,Long>
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,Long>
Overrides:
hashCode in class Object

equals

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

toString

public String toString()
Overrides:
toString in class Object


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