NodeOptional

java.lang.Object
- EDU.purdue.jtb.parser.syntaxtree.NodeOptional

All Implemented Interfaces:

INode, java.io.Serializable
```
public class NodeOptional
extends java.lang.Object
implements INode
```
Represents a grammar optional node (? or []), e.g. ' ( A )? ' or ' [ A ] '.
The class stores the node.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

INode node
The node (if null there is no node)
- Fields inherited from interface EDU.purdue.jtb.parser.syntaxtree.INode
  LS

Constructor Summary

Constructors
Constructor Description

NodeOptional()
Initializes an empty NodeOptional.

NodeOptional(INode n)
Initializes a NodeOptional with a node.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`accept(IIntVisitor vis)`	Accepts a `IIntVisitor` visitor with user return data.
`void`	`accept(IVoidVisitor vis)`	Accepts a `IVoidVisitor` visitor} visitor with user return data.
`void`	`addNode(INode n)`	Adds a node to the `NodeOptional`.
`boolean`	`present()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - node
```
public INode node
```
    The node (if null there is no node)
- Constructor Detail
  - NodeOptional
```
public NodeOptional()
```
    Initializes an empty NodeOptional.
  - NodeOptional
```
public NodeOptional(INode n)
```
    Initializes a NodeOptional with a node.
    
    Parameters:
    
    n - - the node
- Method Detail
  - addNode
```
public void addNode(INode n)
```
    Adds a node to the NodeOptional.
    
    Parameters:
    
    n - - the node to add
  - present
```
public boolean present()
```
    Returns:
    
    true if the node exists, false otherwise
  - accept
```
public int accept(IIntVisitor vis)
```
    Accepts a IIntVisitor visitor with user return data.
    
    Specified by:
    
    accept in interface INode
    
    Parameters:
    
    vis - - the visitor
    
    Returns:
    
    the user Return data
  - accept
```
public void accept(IVoidVisitor vis)
```
    Accepts a IVoidVisitor visitor} visitor with user return data.
    
    Specified by:
    
    accept in interface INode
    
    Parameters:
    
    vis - - the visitor