it.unimi.dsi.fastutil.objects
Class Reference2ReferenceFunctions.Singleton<K,V>

java.lang.Object
  extended by it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,V>
      extended by it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.Singleton<K,V>
All Implemented Interfaces:
Function<K,V>, Reference2ReferenceFunction<K,V>, Serializable, Cloneable
Direct Known Subclasses:
Reference2ReferenceMaps.Singleton
Enclosing class:
Reference2ReferenceFunctions

public static class Reference2ReferenceFunctions.Singleton<K,V>
extends AbstractReference2ReferenceFunction<K,V>
implements Serializable, Cloneable

An immutable class representing a type-specific singleton function.

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

See Also:
Serialized Form

Field Summary
protected  K key
           
static long serialVersionUID
           
protected  V value
           
 
Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction
defRetValue
 
Constructor Summary
protected Reference2ReferenceFunctions.Singleton(K key, V value)
           
 
Method Summary
 Object clone()
           
 boolean containsKey(Object k)
          Returns true if this function contains a mapping for the specified key.
 V get(Object k)
          Returns the value associated by this function to the specified key.
 int size()
          Returns the intended number of keys in this function, or -1 if no such number exists.
 
Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction
clear, defaultReturnValue, defaultReturnValue, put, remove
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

serialVersionUID

public static final long serialVersionUID
See Also:
Constant Field Values

key

protected final K key

value

protected final V value
Constructor Detail

Reference2ReferenceFunctions.Singleton

protected Reference2ReferenceFunctions.Singleton(K key,
                                                 V value)
Method Detail

containsKey

public boolean containsKey(Object k)
Description copied from interface: Function
Returns true if this function contains a mapping for the specified key.

Note that for some kind of functions (e.g., hashes) this method will always return true.

Specified by:
containsKey in interface Function<K,V>
Parameters:
k - the key.
Returns:
true if this function associates a value to key.
See Also:
Map.containsKey(Object)

get

public V get(Object k)
Description copied from interface: Function
Returns the value associated by this function to the specified key.

Specified by:
get in interface Function<K,V>
Parameters:
k - the key.
Returns:
the corresponding value, or null if no value was present for the given key.
See Also:
Map.get(Object)

size

public int size()
Description copied from interface: Function
Returns the intended number of keys in this function, or -1 if no such number exists.

Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.

Specified by:
size in interface Function<K,V>
Returns:
the intended number of keys in this function, or -1 if that number is not available.

clone

public Object clone()
Overrides:
clone in class Object


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