Package com.singularsys.extensions.rewrite

Class SmallNumberRule

java.lang.Object

com.singularsys.extensions.rewrite.SmallNumberRule

All Implemented Interfaces:

RewriteVisitor.ConstantRuleI, JepComponent, java.io.Serializable

public class SmallNumberRule
extends java.lang.Object
implements RewriteVisitor.ConstantRuleI

A rule where numbers very close to zero are replaces by zero.

Since:

Jep 4.0/Extentions 2.1

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected NodeFactory	nf	A NodeFactory used for construction nodes.

Constructor Summary

Constructors

Constructor	Description
SmallNumberRule(double tolerance)	Create the rule

Method Summary

Modifier and Type	Method	Description
Node	apply(ASTConstant node)	Rewrites the node.
JepComponent	getLightWeightInstance()	Gets a light-weight instance suitable for using in multiple threads.
double	getTolerance()
void	init(Jep jep)	Initialize the component.
void	setTolerance(double tolerance)
boolean	test(ASTConstant node)	Returns true if node needs to be rewritten, according to this rule.

Methods inherited from class java.lang.Object

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

Field Detail

nf

protected NodeFactory nf

A NodeFactory used for construction nodes.

Constructor Detail

SmallNumberRule

public SmallNumberRule(double tolerance)

Create the rule

Parameters:

tolerance - numbers smaller than this are considered zero

Method Detail

init

public void init(Jep jep)

Description copied from interface: JepComponent

Initialize the component. This methods is called whenever a component is added to Jep. Hence it allows components to keep track of the other components they may rely on.

Specified by:

init in interface JepComponent

Parameters:

jep - the current Jep instance

test

public boolean test(ASTConstant node)
             throws ParseException

Description copied from interface: RewriteVisitor.ConstantRuleI

Returns true if node needs to be rewritten, according to this rule.

Specified by:

test in interface RewriteVisitor.ConstantRuleI

Throws:

ParseException - if for some reason rewriting cannot be performed.

apply

public Node apply(ASTConstant node)
           throws ParseException

Description copied from interface: RewriteVisitor.ConstantRuleI

Rewrites the node. Note a new node must be constructed rather than simply changing the value.

Specified by:

apply in interface RewriteVisitor.ConstantRuleI

Throws:

ParseException

getLightWeightInstance

public JepComponent getLightWeightInstance()

Description copied from interface: JepComponent

Gets a light-weight instance suitable for using in multiple threads.

Specified by:

getLightWeightInstance in interface JepComponent

Returns:

either an new instance, null or 'this'.

getTolerance

public double getTolerance()

setTolerance

public void setTolerance(double tolerance)