org.apache.hadoop.hive.ql.lib
Class ForwardWalker

java.lang.Object
  org.apache.hadoop.hive.ql.lib.DefaultGraphWalker
      org.apache.hadoop.hive.ql.lib.ForwardWalker

All Implemented Interfaces:

GraphWalker

public class ForwardWalker
extends DefaultGraphWalker

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

dispatcher, opStack, retMap, toWalk

Constructor Summary

ForwardWalker(Dispatcher disp)
Constructor.

Method Summary

protected void	addAllParents(Node nd)
protected boolean	allParentsDispatched(Node nd)
void	walk(Node nd) walk the current operator and its descendants.

Methods inherited from class org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

dispatch, dispatchAndReturn, getDispatchedList, getToWalk, startWalking

Methods inherited from class java.lang.Object

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

Constructor Detail

ForwardWalker

public ForwardWalker(Dispatcher disp)

Constructor.

Parameters:

disp - dispatcher to call for each op encountered

Method Detail

allParentsDispatched

protected boolean allParentsDispatched(Node nd)

addAllParents

protected void addAllParents(Node nd)

walk

public void walk(Node nd)
          throws SemanticException

walk the current operator and its descendants.

Overrides:

walk in class DefaultGraphWalker

Parameters:

nd - current operator in the graph

Throws:

SemanticException