Package com.github.siroshun09.configapi.core.node

Class NullNode

java.lang.Object

com.github.siroshun09.configapi.core.node.NullNode

All Implemented Interfaces:

Node<Object>

public final class NullNode
extends Object
implements Node<Object>

A Node implementation that represents null.

Field Summary

Fields

Modifier and Type	Field	Description
static final NullNode	NULL	An instance of NullNode.

Method Summary

Modifier and Type	Method	Description
@NotNull VisitResult	accept(@NotNull NodeVisitor visitor)	Accepts a NodeVisitor for this Node.
@NotNull Optional<Object>	asOptional()	Gets an object as Optional.
boolean	hasValue()	Checks if this Node holds an object.
@Nullable Object	value()	Gets an object which this Node holds

Methods inherited from class java.lang.Object

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

Field Details

NULL

public static final NullNode NULL

An instance of NullNode.

Method Details

value

@Nullable
public @Nullable Object value()

Description copied from interface: Node

Gets an object which this Node holds

Specified by:

value in interface Node<Object>

Returns:

an object which this Node holds

hasValue

public boolean hasValue()

Description copied from interface: Node

Checks if this Node holds an object.

The default implementation of this method checks if the returning value from Node.value() is not null.

Specified by:

hasValue in interface Node<Object>

Returns:

true if this Node holds an object, otherwise false

asOptional

@NotNull
public @NotNull Optional<Object> asOptional()

Description copied from interface: Node

Gets an object as Optional.

The default implementation of this method returns Optional.ofNullable(Object) which is wrapping Node.value().

Specified by:

asOptional in interface Node<Object>

Returns:

the Optional

accept

@NotNull
public @NotNull VisitResult accept(@NotNull
 @NotNull NodeVisitor visitor)

Description copied from interface: Node

Accepts a NodeVisitor for this Node.

Specified by:

accept in interface Node<Object>

Parameters:

visitor - a NodeVisitor to accept

Returns:

a VisitResult