com.go.tea.parsetree
Class NotExpression

java.lang.Object
  |
  +--com.go.tea.parsetree.Node
        |
        +--com.go.tea.parsetree.Expression
              |
              +--com.go.tea.parsetree.NotExpression

All Implemented Interfaces:

java.lang.Cloneable, Logical, java.io.Serializable

public class NotExpression

extends Expression

implements Logical

NotExpression is a simple unary expression that calculates the logical "not" value of an expression. The expression it operates on must return a Boolean type.

Version:

22 , 9/07/00

Author:

Brian S O'Neill

See Also:

Serialized Form

Inner classes inherited from class com.go.tea.parsetree.Expression

Expression.Conversion

Constructor Summary

NotExpression(SourceInfo info, Expression expr)

Method Summary

java.lang.Object	accept(NodeVisitor visitor) Every subclass of Node must override this method with the following: return visitor.visit(this).
java.lang.Object	clone() Returns a clone of this Node and all its children.
void	convertTo(Type type, boolean preferCast) Applies a type conversion to this expression which is chained to all previous conversions.
Expression	getExpression()
boolean	isExceptionPossible() Returns true if an exception can be thrown while executing this Expression.
void	setExpression(Expression expr)
void	setType(Type type) Sets the type of this expression, clearing the conversion chain.

Methods inherited from class com.go.tea.parsetree.Expression

convertTo, getConversionChain, getInitialType, getType, getValue, isValueKnown, setInitialType

Methods inherited from class com.go.tea.parsetree.Node

getSourceInfo, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

NotExpression

public NotExpression(SourceInfo info,
                     Expression expr)

Method Detail

accept

public java.lang.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 Expression

Following copied from class: com.go.tea.parsetree.Node

Parameters:

visitor - A visitor of this Node

Returns:

Node The Node returned by the visitor

See Also:

NodeVisitor

clone

public java.lang.Object clone()

Description copied from class: Node

Returns a clone of this Node and all its children. Immutable child objects are not necessarily cloned

Overrides:

clone in class Expression

isExceptionPossible

public boolean isExceptionPossible()

Description copied from class: Expression

Returns true if an exception can be thrown while executing this Expression. By default, returns true only if a type conversion could cause an exception.

Overrides:

isExceptionPossible in class Expression

convertTo

public void convertTo(Type type,
                      boolean preferCast)

Description copied from class: Expression

Applies a type conversion to this expression which is chained to all previous conversions.

Overrides:

convertTo in class Expression

Following copied from class: com.go.tea.parsetree.Expression

Parameters:

toType - the type to convert to.

preferCast - a hint that the conversion should be performed by a type cast operation, by default is true.

Throws:

java.lang.IllegalArgumentException - when the conversion is illegal.

setType

public void setType(Type type)

Description copied from class: Expression

Sets the type of this expression, clearing the conversion chain.

Overrides:

setType in class Expression

getExpression

public Expression getExpression()

setExpression

public void setExpression(Expression expr)