Interface TreeQuestion.Model

Enclosing class:

TreeQuestion

public static interface TreeQuestion.Model

An interface that provides the model for the tree whose nodes are selected by a TreeQuestion.

Method Summary

Modifier and Type	Method	Description
Object	getChild(Object node, int index)	Get a child of a specified node, or null if no such child exists.
int	getChildCount(Object node)	Get the number of children of a specified node.
String	getName(Object node)	Get the name of a specified node.
String	getPath(Object node)	Get the full path from the root node of a specified node.
Object	getRoot()	Get the root node of the tree.
boolean	isLeaf(Object node)	Determine if this a node is a leaf node.

Method Details

getRoot

Object getRoot()

Get the root node of the tree.

Returns:

the root node of the tree.

getChildCount

int getChildCount(Object node)

Get the number of children of a specified node.

Parameters:

node - the node for which to get the number of children

Returns:

the number of children of the specified node

getChild

Object getChild(Object node,
 int index)

Get a child of a specified node, or null if no such child exists.

Parameters:

node - the node for which to get the child

index - the index of the child; this should be a number greater than or equal to zero and less than the number of children of the node.

Returns:

the specified child, or null if index does not identify a valid child.

See Also:

• getChildCount(Object)

getName

String getName(Object node)

Get the name of a specified node. The name will be used to construct paths. At a minimum, it should not contain '/'.

Parameters:

node - the node whose name is required

Returns:

the name of the specified node

getPath

String getPath(Object node)

Get the full path from the root node of a specified node.

Parameters:

node - the node whose path is required

Returns:

the path of the specified node from the root node, as composed from the names of this node and its ancestors, using '/' to separate the individual names.

isLeaf

boolean isLeaf(Object node)

Determine if this a node is a leaf node. This is primarily an attribute of the node's actual type, and is not necessarily the same as having zero children. (A leaf node implies zero children, but zero children does not imply a node is a leaf.)

Parameters:

node - the node to check for being a leaf

Returns:

true if the specified node is a leaf node, and false otherwise.