Package EDU.purdue.jtb.parser.syntaxtree
Class NodeOptional
- java.lang.Object
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- EDU.purdue.jtb.parser.syntaxtree.NodeOptional
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- 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
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Constructor Summary
Constructors Constructor Description NodeOptional()
Initializes an emptyNodeOptional
.NodeOptional(INode n)
Initializes aNodeOptional
with a node.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
accept(IIntVisitor vis)
Accepts aIIntVisitor
visitor with user return data.void
accept(IVoidVisitor vis)
Accepts aIVoidVisitor
visitor} visitor with user return data.void
addNode(INode n)
Adds a node to theNodeOptional
.boolean
present()
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Field Detail
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node
public INode node
The node (if null there is no node)
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Constructor Detail
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NodeOptional
public NodeOptional()
Initializes an emptyNodeOptional
.
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NodeOptional
public NodeOptional(INode n)
Initializes aNodeOptional
with a node.- Parameters:
n
- - the node
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Method Detail
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addNode
public void addNode(INode n)
Adds a node to theNodeOptional
.- Parameters:
n
- - the node to add
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present
public boolean present()
- Returns:
- true if the node exists, false otherwise
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accept
public int accept(IIntVisitor vis)
Accepts aIIntVisitor
visitor with user return data.
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accept
public void accept(IVoidVisitor vis)
Accepts aIVoidVisitor
visitor} visitor with user return data.
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