it.unimi.dsi.fastutil.objects

Class Object2ReferenceFunctions.Singleton<K,V>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractObject2ReferenceFunction<K,V>

it.unimi.dsi.fastutil.objects.Object2ReferenceFunctions.Singleton<K,V>

All Implemented Interfaces:

Function<K,V>, Object2ReferenceFunction<K,V>, Serializable, Cloneable

Direct Known Subclasses:

Object2ReferenceMaps.Singleton

Enclosing class:

Object2ReferenceFunctions

public static class Object2ReferenceFunctions.Singleton<K,V>
extends AbstractObject2ReferenceFunction<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

Method Summary

Methods

Modifier and Type	Method and Description
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.AbstractObject2ReferenceFunction

clear, defaultReturnValue, defaultReturnValue, put, remove

Methods inherited from class java.lang.Object

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

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