Package it.unimi.dsi.fastutil.ints

Class Int2IntFunctions.Singleton

java.lang.Object

it.unimi.dsi.fastutil.ints.AbstractInt2IntFunction

it.unimi.dsi.fastutil.ints.Int2IntFunctions.Singleton

All Implemented Interfaces:

Function<Integer,Integer>, Int2IntFunction, Serializable, Cloneable, Function<Integer,Integer>, IntUnaryOperator

Direct Known Subclasses:

Int2IntMaps.Singleton

Enclosing class:

Int2IntFunctions

public static class Int2IntFunctions.Singleton
extends AbstractInt2IntFunction
implements Serializable, Cloneable

An immutable class representing a type-specific singleton function. Note that the default return value is still settable.

Note that albeit the function is immutable, its default return value may be changed.

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

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
Object	clone()
boolean	containsKey(int k)	Returns true if this function contains a mapping for the specified key.
int	get(int k)	Returns the value to which the given key is mapped.
int	getOrDefault(int k, int defaultValue)	Returns the value associated by this function to the specified key, or give the specified value if not present.
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.ints.AbstractInt2IntFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.dsi.fastutil.Function

apply, clear

Methods inherited from interface it.unimi.dsi.fastutil.ints.Int2IntFunction

andThen, andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsInt, compose, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, containsKey, get, getOrDefault, put, put, remove, remove

Methods inherited from interface java.util.function.IntUnaryOperator

andThen, compose

Method Details

containsKey

public boolean containsKey(int k)

Description copied from interface: Int2IntFunction

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. In particular, this default implementation always returns true.

Specified by:

containsKey in interface Int2IntFunction

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

• Function.containsKey(Object)

get

public int get(int k)

Description copied from interface: Int2IntFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Int2IntFunction

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)

getOrDefault

public int getOrDefault(int k,
 int defaultValue)

Description copied from interface: Int2IntFunction

Returns the value associated by this function to the specified key, or give the specified value if not present.

Specified by:

getOrDefault in interface Int2IntFunction

Parameters:

k - the key.

defaultValue - the value to return if not present.

Returns:

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

See Also:

• Function.getOrDefault(Object, 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. This default implementation, in particular, returns -1.

Specified by:

size in interface Function<Integer,Integer>

Returns:

the intended number of keys in this function, or -1 if that number is not available.

clone

public Object clone()