de.jppietsch.prefedit
Class AbstractTreeNode

java.lang.Object
  de.jppietsch.prefedit.AbstractTreeNode

All Implemented Interfaces:

TreeNode

public abstract class AbstractTreeNode

extends Object

implements TreeNode

Baseclass for this package's collection of tree nodes.

Version:

$Revision: 1.2 $

Author:

Jan-Peter Pietsch

Field Summary

private List

childs List of child nodes.

Constructor Summary

AbstractTreeNode()

Method Summary

Enumeration	children() Returns an enumeration of the direct childs of this node.
private List	childs() Returns the list of childs.
boolean	getAllowsChildren() All nodes are preferences and therefore allow childs.
TreeNode	getChildAt(int aChildIndex) Returns the n'th child node of this node.
int	getChildCount() Returns the number of child nodes.
int	getIndex(TreeNode aNode) Returns the index of a given child.
abstract Preferences	getPreferences() Returns the preferences represented by this node.
protected abstract void	initializeChilds(List someChilds) Fills the list of child nodes.
boolean	isLeaf() Does this node have any childs?

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.swing.tree.TreeNode

getParent

Field Detail

childs

private List childs

List of child nodes.

Constructor Detail

AbstractTreeNode

public AbstractTreeNode()

Method Detail

getChildAt

public TreeNode getChildAt(int aChildIndex)

Returns the n'th child node of this node.

Specified by:

getChildAt in interface TreeNode

Parameters:

aChildIndex - Zero-based index.

Returns:

A tree node.

getChildCount

public int getChildCount()

Returns the number of child nodes.

Specified by:

getChildCount in interface TreeNode

Returns:

Length of list determined by initializeChilds(List).

getIndex

public int getIndex(TreeNode aNode)

Returns the index of a given child.

Specified by:

getIndex in interface TreeNode

Parameters:

aNode - of which the index is searched.

Returns:

The index of aNode or -1.

getAllowsChildren

public boolean getAllowsChildren()

All nodes are preferences and therefore allow childs.

Specified by:

getAllowsChildren in interface TreeNode

Returns:

Always true.

isLeaf

public boolean isLeaf()

Does this node have any childs?

Specified by:

isLeaf in interface TreeNode

Returns:

This node has no childs.

getPreferences

public abstract Preferences getPreferences()

Returns the preferences represented by this node.

Returns:

Preferences represented by this node or null if this is the root.

children

public Enumeration children()

Returns an enumeration of the direct childs of this node.

Specified by:

children in interface TreeNode

Returns:

Enumeration of all direct childs of this node.

initializeChilds

protected abstract void initializeChilds(List someChilds)

Fills the list of child nodes.

Parameters:

someChilds - to be filled.

childs

private List childs()

Returns the list of childs. Calls initializeChilds(List) when this method is called the first time.

Returns:

Guaranteed initialized childs.