Package com.singularsys.extensions.xjep

Class EquationExtractor<D>

java.lang.Object

com.singularsys.jep.walkers.GenericDoNothingVisitor<D>

com.singularsys.jep.walkers.GenericDeepCopyVisitor<D>

com.singularsys.extensions.xjep.EquationExtractor<D>

All Implemented Interfaces:

GenericVisitor<Node,D,ParseException>, JepComponent, Serializable

Direct Known Subclasses:

DEquationExtractor

public class EquationExtractor<D>
extends GenericDeepCopyVisitor<D>

Extract equations for symbolic variables. If y is a variable which has an equation it will be replaced by its equation.

Since Jep 4.1, extensions 2.2 this is a generic class extending GenericDeepCopyVisitor. A typical implementation would use new EquationExtractor<Void>(). This may generate warnings about unchecked conversions, or raw type in older code.

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.walkers.GenericDoNothingVisitor

ft, nf, ot

Constructor Summary

Constructors

Constructor	Description
EquationExtractor()
EquationExtractor(Jep j)

Method Summary

Modifier and Type	Method	Description
Node	replaceRHSVariablesByEquations(Node node)	Replace variables on the right had side of an assignment by their equations
Node	replaceVariableByExpressions(Node node)	Replace all symbolic variable by their equations
Node	visit(ASTVarNode node, D data)	Visit a variable node
Node	visit(Node node)

Methods inherited from class com.singularsys.jep.walkers.GenericDeepCopyVisitor

getLightWeightInstance, visit, visit, visit, visit

Methods inherited from class com.singularsys.jep.walkers.GenericDoNothingVisitor

childrenHaveChanged, copyChildrenIfNeeded, copyChildrenIfNeeded, init, makeException

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.singularsys.jep.GenericVisitor

makeException, visitChildren

Constructor Details

EquationExtractor

public EquationExtractor()

EquationExtractor

public EquationExtractor(Jep j)

Method Details

replaceVariableByExpressions

public Node replaceVariableByExpressions(Node node)
                                  throws JepException

Replace all symbolic variable by their equations

Parameters:

node - root of expression

Returns:

copy of node with variables replaced by their equations

Throws:

JepException

replaceRHSVariablesByEquations

public Node replaceRHSVariablesByEquations(Node node)
                                    throws ParseException

Replace variables on the right had side of an assignment by their equations

Parameters:

node - an equation of the form g:=f^2-1

Returns:

a copy of the node

Throws:

ParseException - on error

visit

public Node visit(ASTVarNode node,
 D data)
           throws ParseException

Description copied from interface: GenericVisitor

Visit a variable node

Specified by:

visit in interface GenericVisitor<Node,D,ParseException>

Overrides:

visit in class GenericDeepCopyVisitor<D>

Parameters:

node - current node

data - context data

Returns:

the result of visiting the node

Throws:

ParseException

visit

public Node visit(Node node)
           throws ParseException

Throws:

ParseException