it.unimi.dsi.fastutil.objects

Class Reference2LongFunctions.Singleton<K>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction<K>

it.unimi.dsi.fastutil.objects.Reference2LongFunctions.Singleton<K>

All Implemented Interfaces:

Function<K,Long>, Reference2LongFunction<K>, Serializable, Cloneable

Direct Known Subclasses:

Reference2LongMaps.Singleton

Enclosing class:

Reference2LongFunctions

public static class Reference2LongFunctions.Singleton<K>
extends AbstractReference2LongFunction<K>
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

Fields

Modifier and Type	Field and Description
protected K	key
static long	serialVersionUID
protected long	value

Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction

defRetValue

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Reference2LongFunctions.Singleton(K key, long value)

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.
long	getLong(Object k) Returns the value to which the given key is mapped.
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.AbstractReference2LongFunction

clear, defaultReturnValue, defaultReturnValue, get, put, put, remove, removeLong

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 long value

Constructor Detail

Reference2LongFunctions.Singleton

protected Reference2LongFunctions.Singleton(K key,
                                 long 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,Long>

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

getLong

public long getLong(Object k)

Description copied from interface: Reference2LongFunction

Returns the value to which the given key is mapped.

Specified by:

getLong in interface Reference2LongFunction<K>

Parameters:

k - the key.

Returns:

the corresponding value, or the default return value if no value was present for the given key.

See Also:

Function.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,Long>

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