mwalk.visitor
Class MergeVisitor

java.lang.Object
  |
  +--mwalk.visitor.AbstractVisitor
        |
        +--mwalk.visitor.MergeVisitor

public class MergeVisitor

extends AbstractVisitor

implements DownVisitor

A visitor used by the builder to merge the period tables.

Version:

1.0

Author:

Robert Chalmers

Fields inherited from class mwalk.visitor.AbstractVisitor

CFG_BASE, eval, seen, verbose

Constructor Summary

MergeVisitor()
Default constructor.

Method Summary

boolean	postfix() Whether to visit after visiting parent/children.
void	reset(Tree tree) Reset the visitor for a new pass over the tree.
java.lang.Object	visitDown(Tree tree, TreeNode node) Visit the current node prior to visiting children.
java.lang.Object	visitDown(Tree tree, TreeNode node, java.util.Vector list) Visit the current node after visiting children.

Methods inherited from class mwalk.visitor.AbstractVisitor

again, cfgBoolean, cfgInt, cfgString, cfgVisitor, evaluator, evaluator, getChildren, getParents, getReceivers, haveSeen, haveVisited, init, markSeen, markVisited, nextReceiver, prefix, verbose, visitUp, visitUp, walkDown, walkUp

Methods inherited from class java.lang.Object

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

Constructor Detail

MergeVisitor

public MergeVisitor()

Default constructor.

Method Detail

postfix

public boolean postfix()

Whether to visit after visiting parent/children.

Overrides:

postfix in class AbstractVisitor

Returns:

boolean whether to visit after

reset

public void reset(Tree tree)

Reset the visitor for a new pass over the tree.

Overrides:

reset in class AbstractVisitor

Parameters:

Tree - vistited tree

visitDown

public java.lang.Object visitDown(Tree tree,
                                  TreeNode node)

Visit the current node prior to visiting children. This method is called if prefix() returns true.

Specified by:

visitDown in interface DownVisitor

Overrides:

visitDown in class AbstractVisitor

Parameters:

Tree - current tree instance

TreeNode - current node

Returns:

Object optional return value to pass back along the path

Throws:

VisitException - if a problem ocurred during visit

visitDown

public java.lang.Object visitDown(Tree tree,
                                  TreeNode node,
                                  java.util.Vector list)
                           throws VisitException

Visit the current node after visiting children. This method is called if postfix() returns true.

Specified by:

visitDown in interface DownVisitor

Overrides:

visitDown in class AbstractVisitor

Parameters:

Tree - current tree instance

TreeNode - current node

Vector - list of return values passed back along the path

Returns:

Object optional return value to pass back along the path

Throws:

VisitException - if a problem ocurred during visit