net.shredzone.jshred.swing

Class EmptyTreeModel

java.lang.Object

net.shredzone.jshred.swing.EmptyTreeModel

All Implemented Interfaces:

TreeModel

public final class EmptyTreeModel
extends Object
implements TreeModel

This is just a mere empty TreeModel which will never have any entries.

Since:

R7

Author:

Richard "Shred" Körber

Constructor Summary

Constructors

Constructor and Description
EmptyTreeModel()

Method Summary

Modifier and Type	Method and Description
void	addTreeModelListener(TreeModelListener l) Adds a TreeModelListener.
Object	getChild(Object parent, int index) Gets a child.
int	getChildCount(Object parent) Gets the child count, which is always 0.
int	getIndexOfChild(Object parent, Object child) Gets the index of a child.
Object	getRoot() Gets the root node.
boolean	isLeaf(Object node) Checks if the node is a leaf.
void	removeTreeModelListener(TreeModelListener l) Removes a TreeModelListener.
void	valueForPathChanged(TreePath path, Object newValue) Value for path changed.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyTreeModel

public EmptyTreeModel()

Method Detail

getRoot

public Object getRoot()

Gets the root node. It will return null since the tree has no nodes.

Specified by:

getRoot in interface TreeModel

getChildCount

public int getChildCount(Object parent)

Gets the child count, which is always 0.

Specified by:

getChildCount in interface TreeModel

isLeaf

public boolean isLeaf(Object node)

Checks if the node is a leaf. Should never be invoked since there are no nodes. Will always return true.

Specified by:

isLeaf in interface TreeModel

addTreeModelListener

public void addTreeModelListener(TreeModelListener l)

Adds a TreeModelListener. Since the tree will never change, the listener is just ignored.

Specified by:

addTreeModelListener in interface TreeModel

removeTreeModelListener

public void removeTreeModelListener(TreeModelListener l)

Removes a TreeModelListener. Since the tree will never change, the listener is just ignored.

Specified by:

removeTreeModelListener in interface TreeModel

getChild

public Object getChild(Object parent,
                       int index)

Gets a child. Should never be invoked since there are no childs. It will always return null.

Specified by:

getChild in interface TreeModel

getIndexOfChild

public int getIndexOfChild(Object parent,
                           Object child)

Gets the index of a child. Should never be invoked since there are no childs. It will always return -1.

Specified by:

getIndexOfChild in interface TreeModel

valueForPathChanged

public void valueForPathChanged(TreePath path,
                                Object newValue)

Value for path changed. Should never be invoked for an empty tree. It just does nothing.

Specified by:

valueForPathChanged in interface TreeModel