com.singularsys.jep.walkers
Class ExpressionConsolidator

java.lang.Object
  com.singularsys.jep.walkers.DoNothingVisitor
      com.singularsys.jep.walkers.DeepCopyVisitor
          com.singularsys.jep.walkers.ExpressionConsolidator

All Implemented Interfaces:

JepComponent, ParserVisitor, java.io.Serializable

public class ExpressionConsolidator
extends DeepCopyVisitor

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

protected java.util.List<Operator>

ops

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

ft, jep, nf, ot, vt

Constructor Summary

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

Method Summary

boolean	add(Operator op) Adds an addition operator to be consolidated.
Node	consolidate(Node node)
protected Node[]	consolidateChildren(Operator op, 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.
java.util.List<Operator>	getOps() The list of operators which are consolidated
java.lang.Object	visit(ASTOpNode node, java.lang.Object data) Visit a operator node.

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

deepCopy, visit, visit, visit

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

copyChildrenIfNeeded, getFunctionTable, getLightWeightInstance, getNodeFactory, getOperatorTable, getVariableTable, init, visit, visitChildren, visitNode

Methods inherited from class java.lang.Object

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

Field Detail

ops

protected java.util.List<Operator> ops

Constructor Detail

ExpressionConsolidator

public ExpressionConsolidator(Jep j)

Default constructor, Add and Multiply are consolidated.

Parameters:

j -

Method Detail

consolidate

public Node consolidate(Node node)
                 throws JepException

Throws:

JepException

consolidateChildren

protected Node[] consolidateChildren(Operator op,
                                     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 java.lang.Object visit(ASTOpNode node,
                              java.lang.Object data)
                       throws JepException

Description copied from class: DoNothingVisitor

Visit a operator node. Can be overridden by sub-classes.

Specified by:

visit in interface ParserVisitor

Overrides:

visit in class DeepCopyVisitor

Throws:

JepException

add

public boolean add(Operator op)

Adds an addition operator to be consolidated.

Parameters:

op - operator to use

Returns:

true

getOps

public java.util.List<Operator> getOps()

The list of operators which are consolidated

Returns:

the list