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

java.lang.Object
  it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,V>
      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

static long

serialVersionUID

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, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

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