public class PreOrderDepthFirstWalker extends PlanWalker
plan| Constructor and Description |
|---|
PreOrderDepthFirstWalker(OperatorPlan plan) |
| Modifier and Type | Method and Description |
|---|---|
boolean |
getBranchFlag() |
void |
setBranchFlag() |
PlanWalker |
spawnChildWalker(OperatorPlan plan)
Return a new instance of this same type of walker for a subplan.
|
void |
walk(PlanVisitor visitor)
Begin traversing the graph.
|
getPlan, setPlanpublic PreOrderDepthFirstWalker(OperatorPlan plan)
plan - Plan for this walker to traverse.public void setBranchFlag()
public boolean getBranchFlag()
public void walk(PlanVisitor visitor) throws FrontendException
walk in class PlanWalkervisitor - Visitor this walker is being used by.VisitorException - if an error is encountered while walking.FrontendExceptionpublic PlanWalker spawnChildWalker(OperatorPlan plan)
PlanWalkerspawnChildWalker in class PlanWalkerplan - Plan for the new walker.Copyright © 2007-2017 The Apache Software Foundation