Package com.singularsys.jep.walkers

Class ExpressionConsolidator

java.lang.Object

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

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

com.singularsys.jep.walkers.ExpressionConsolidator

All Implemented Interfaces:

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

public class ExpressionConsolidator
extends GenericDeepCopyVisitor<Void>

Consolidates nested addition and multiplication to produce nary operators. For example (x+y)+z -> +(x,y,z)

Author:

Richard Morris

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<Operator>	ops

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

ft, nf, ot

Constructor Summary

Constructors

Constructor	Description
ExpressionConsolidator(Jep j)	Default constructor, Add and Multiply are consolidated.

Method Summary

Modifier and Type	Method	Description
boolean	add(Operator op)	Adds an addition operator to be consolidated.
Node	consolidate(Node node)
protected List<Node>	consolidateChildren(Operator op, List<Node> children)	Creates an array of Nodes, if the child is an ASTOpNode whose operator is op, then the children of that child will be added otherwise the child is added.
List<Operator>	getOps()	The list of operators which are consolidated
Node	visit(ASTOpNode node, Void data)	Visit an operator 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

Field Details

ops

protected final List<Operator> ops

Constructor Details

ExpressionConsolidator

public ExpressionConsolidator(Jep j)

Default constructor, Add and Multiply are consolidated.

Parameters:

j -

Method Details

consolidate

public Node consolidate(Node node)
                 throws JepException

Throws:

JepException

consolidateChildren

protected List<Node> consolidateChildren(Operator op,
 List<Node> children)

Creates an array of Nodes, if the child is an ASTOpNode whose operator is op, then the children of that child will be added otherwise the child is added.

Parameters:

op -

children -

Returns:

a new list of nodes

visit

public Node visit(ASTOpNode node,
 Void data)
           throws ParseException

Description copied from interface: GenericVisitor

Visit an operator node

Specified by:

visit in interface GenericVisitor<Node,Void,ParseException>

Overrides:

visit in class GenericDeepCopyVisitor<Void>

Parameters:

node - current node

data - context data

Returns:

the result of visiting the node

Throws:

ParseException

add

public boolean add(Operator op)

Adds an addition operator to be consolidated.

Parameters:

op - operator to use

Returns:

true

getOps

public List<Operator> getOps()

The list of operators which are consolidated

Returns:

the list