Package org.daiitech.naftah.builtin.lang

Class None

java.lang.Object

org.daiitech.naftah.builtin.lang.None

public final class None
extends Object

this class represents a singleton value indicating the absence of a value.

This is similar to null in Java, but it's implemented as a safe, immutable object to avoid NullPointerExceptions.

Used to represent "no value" in expression evaluations or logic operations.

Author:

Chakib Daii

Field Summary

Fields

Modifier and Type	Field	Description
private static final None	INSTANCE	The singleton instance of None.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	None()	Private constructor to prevent external instantiation.

Method Summary

Modifier and Type	Method	Description
static Object	get()	Returns the singleton instance representing None.
static boolean	isNone(Object object)	Checks whether the given object is the None instance.
String	toString()	Returns the string representation of this None object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

INSTANCE

private static final None INSTANCE

The singleton instance of None.

Constructor Details

None

private None()

Private constructor to prevent external instantiation.

Method Details

get

public static Object get()

Returns the singleton instance representing None.

Returns:

the None instance

isNone

public static boolean isNone(Object object)

Checks whether the given object is the None instance.

Parameters:

object - the object to check

Returns:

true if the object is None; false otherwise

toString

public String toString()

Returns the string representation of this None object.

Overrides:

toString in class Object

Returns:

a string indicating absence of value (can be customized)