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## com.sun.interview
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
`java.lang.Object` | `getChild(java.lang.Object node, int index)` Get a child of a specified node, or null if no such child exists.
`int` | `getChildCount(java.lang.Object node)` Get the number of children of a specified node.
`java.lang.String` | `getName(java.lang.Object node)` Get the name of a specified node.
`java.lang.String` | `getPath(java.lang.Object node)` Get the full path from the root node of a specified node.
`java.lang.Object` | `getRoot()` Get the root node of the tree.
`boolean` | `isLeaf(java.lang.Object node)` Determine if this a node is a leaf node.

Method Detail

### getRoot

    java.lang.Object getRoot()

  Get the root node of the tree.

  Returns:
    the root node of the tree.

### getChildCount

    int getChildCount(java.lang.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

    java.lang.Object getChild(java.lang.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(java.lang.Object)`

### getName

    java.lang.String getName(java.lang.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

    java.lang.String getPath(java.lang.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(java.lang.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.

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