Package uk.blankaspect.common.basictree

Class NullNode

java.lang.Object

uk.blankaspect.common.basictree.AbstractNode

uk.blankaspect.common.basictree.NullNode

All Implemented Interfaces:

Cloneable, ITreeNode<AbstractNode>

public class NullNode
extends AbstractNode

This class implements a node that represents a null value.

Field Summary

Fields

Modifier and Type	Field	Description
static final NodeType	TYPE	The type of a null node.
static final String	VALUE	The string representation of a null node.

Constructor Summary

Constructors

Constructor	Description
NullNode()	Creates a new instance of a null node that has no parent.
NullNode(AbstractNode parent)	Creates a new instance of a null node that has the specified parent.

Method Summary

Modifier and Type	Method	Description
NullNode	clone()	Creates and returns a copy of this null node that has no parent.
boolean	equals(Object obj)	Returns true if the specified object is an instance of NullNode.
NodeType	getType()	Returns the type of this node.
int	hashCode()	Returns the hash code of this null node.
boolean	isContainer()	Returns true if this node can contain other nodes.
String	toString()	Returns a string representation of this null node.

Methods inherited from class uk.blankaspect.common.basictree.AbstractNode

getChildren, getListIndex, getMapKey, getParent, isRoot, setParent

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface uk.blankaspect.common.tree.ITreeNode

isLeaf

Field Details

VALUE

public static final String VALUE

The string representation of a null node.

See Also:

• Constant Field Values

TYPE

public static final NodeType TYPE

The type of a null node.

Constructor Details

NullNode

public NullNode()

Creates a new instance of a null node that has no parent.

NullNode

public NullNode(AbstractNode parent)

Creates a new instance of a null node that has the specified parent.

Parameters:

parent - the parent of the null node.

Method Details

getType

public NodeType getType()

Description copied from class: AbstractNode

Returns the type of this node.

Specified by:

getType in class AbstractNode

Returns:

TYPE.

isContainer

public boolean isContainer()

Returns true if this node can contain other nodes. For a null node, this method always returns false.

Specified by:

isContainer in class AbstractNode

Returns:

false.

equals

public boolean equals(Object obj)

Returns true if the specified object is an instance of NullNode.

Overrides:

equals in class Object

Parameters:

obj - the object with which this null node will be compared.

Returns:

true if obj is an instance of NullNode; false otherwise.

hashCode

public int hashCode()

Returns the hash code of this null node.

Overrides:

hashCode in class Object

Returns:

the hash code of this null node.

clone

public NullNode clone()

Creates and returns a copy of this null node that has no parent.

Overrides:

clone in class AbstractNode

Returns:

a copy of this null node that has no parent.

toString

public String toString()

Returns a string representation of this null node.

Overrides:

toString in class Object

Returns:

a string representation of this null node.