org.zkoss.zul

Interface TreeNode<E>

All Known Implementing Classes:

DefaultTreeNode

public interface TreeNode<E>

Defines the requirements for a tree node object that can change -- by adding or removing child nodes, or by changing the contents of an application-specific data (setData(E)) stored in the node. It is designed to be used with DefaultTreeModel.

Since:

5.0.6

Author:

tomyeh

Method Summary

Methods

Modifier and Type	Method and Description
void	add(TreeNode<E> child) Adds a child to this node at the end.
java.lang.Object	clone() Clones the tree node.
TreeNode<E>	getChildAt(int childIndex) Returns the child TreeNode at index childIndex.
int	getChildCount() Returns the number of children TreeNodes this node contains.
java.util.List<TreeNode<E>>	getChildren() Return children of the receiver
E	getData() Returns the application-specific data of this node.
int	getIndex(TreeNode<E> node) Returns the index of node in this node's children.
DefaultTreeModel<E>	getModel() Returns the tree model it belongs to.
TreeNode<E>	getParent() Returns the parent TreeNode of this node.
void	insert(TreeNode<E> child, int index) Adds child to this node at the given index.
boolean	isLeaf() Returns true if this node is a leaf.
void	remove(int index) Removes the child at index from this node.
void	remove(TreeNode<E> child) Removes the child from this node.
void	setData(E data) Sets the application-specific data associated with this node.
void	setModel(DefaultTreeModel<E> model) Sets the tree model it belongs to.

Method Detail

getModel

DefaultTreeModel<E> getModel()

Returns the tree model it belongs to.

setModel

void setModel(DefaultTreeModel<E> model)

Sets the tree model it belongs to. It can be called only if this node is a root. If a node has a parent, its model shall be the same as its parent.

This method is invoked automatically if DefaultTreeModel, so you don't have to invoke it.

Throws:

java.lang.IllegalArgumentException - if the model is null.

java.lang.IllegalStateException - if the node is not a root.

getData

E getData()

Returns the application-specific data of this node.

setData

void setData(E data)

Sets the application-specific data associated with this node.

getChildren

java.util.List<TreeNode<E>> getChildren()

Return children of the receiver

Returns:

children of the receiver. If the node is a leaf, null is returned.

getChildAt

TreeNode<E> getChildAt(int childIndex)

Returns the child TreeNode at index childIndex.

getChildCount

int getChildCount()

Returns the number of children TreeNodes this node contains.

getParent

TreeNode<E> getParent()

Returns the parent TreeNode of this node.

getIndex

int getIndex(TreeNode<E> node)

Returns the index of node in this node's children. If this node does not contain node, -1 will be returned.

isLeaf

boolean isLeaf()

Returns true if this node is a leaf. Notice that not all non-leaf nodes have children. In file-system terminology, a leaf node is a file, while a non-leaf node is a folder.

insert

void insert(TreeNode<E> child,
          int index)

Adds child to this node at the given index.

Throws:

java.lang.UnsupportedOperationException - if the tree structure is not mutable, or this node does not allow children

java.lang.IndexOutOfBoundsException - if index is out of bounds

java.lang.IllegalArgumentException - if child is an ancestor of this node

java.lang.NullPointerException - if child is null

add

void add(TreeNode<E> child)

Adds a child to this node at the end.

Throws:

java.lang.UnsupportedOperationException - if the tree structure is not mutable, or this node does not allow children

java.lang.IllegalArgumentException - if child is an ancestor of this node

java.lang.NullPointerException - if child is null

remove

void remove(int index)

Removes the child at index from this node.

Throws:

java.lang.UnsupportedOperationException - if the tree structure is not mutable, or this node does not allow children

java.lang.IndexOutOfBoundsException - if index is out of bounds

remove

void remove(TreeNode<E> child)

Removes the child from this node.

Throws:

java.lang.UnsupportedOperationException - if the tree structure is not mutable or this node does not allow children

java.lang.IllegalArgumentException - if child is not a child of this node

clone

java.lang.Object clone()

Clones the tree node.

Notes:

• It is a deep clone, i.e., all descendant are cloned.
• If the implementation supports this method, it shall implement the Cloneable interface too.
• If not supported, the implementation shall throw CloneNotSupportedException.