org.teatrove.tea.parsetree
Class NullLiteral

java.lang.Object
  org.teatrove.tea.parsetree.Node
      org.teatrove.tea.parsetree.Expression
          org.teatrove.tea.parsetree.Literal
              org.teatrove.tea.parsetree.NullLiteral

All Implemented Interfaces:

Serializable, Cloneable

public class NullLiteral
extends Literal

A Literal representing the null Object.

Author:

Brian S O'Neill

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.teatrove.tea.parsetree.Expression

Expression.Conversion

Constructor Summary

NullLiteral(SourceInfo info)

Method Summary

Object	accept(NodeVisitor visitor) Every subclass of Node must override this method with the following: return visitor.visit(this).
Object	getValue() Most expressions can't generate a value at compile-time, so this method simply returns null.

Methods inherited from class org.teatrove.tea.parsetree.Literal

isValueKnown

Methods inherited from class org.teatrove.tea.parsetree.Expression

clone, convertTo, convertTo, forceConversion, getConversionChain, getInitialType, getType, isExceptionPossible, setInitialType, setType

Methods inherited from class org.teatrove.tea.parsetree.Node

getSourceInfo, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NullLiteral

public NullLiteral(SourceInfo info)

Method Detail

accept

public Object accept(NodeVisitor visitor)

Description copied from class: Node

Every subclass of Node must override this method with the following: return visitor.visit(this).

Overrides:

accept in class Literal

Parameters:

visitor - A visitor of this Node

Returns:

Node The Node returned by the visitor

See Also:

NodeVisitor

getValue

public Object getValue()

Description copied from class: Expression

Most expressions can't generate a value at compile-time, so this method simply returns null. Call isValueKnown to check if the expression's value is known at compile-time.

Overrides:

getValue in class Expression