mwalk.visitor
Interface Visitor

All Known Subinterfaces:

DownVisitor, UpVisitor

All Known Implementing Classes:

AbstractVisitor

public interface Visitor

The core interface for all visitors.

Version:

1.0

Author:

Robert Chalmers

Method Summary

boolean	again(Tree tree) Whether to walk the tree again.
ActivityEvaluator	evaluator() Return the current activity evaluator.
void	evaluator(ActivityEvaluator eval) Set the current activity evaluator.
boolean	init(Tree tree) Initialize state.
boolean	postfix() Whether to visit after visiting parent/children.
boolean	prefix() Whether to visit prior to visiting parent/children.
void	reset(Tree tree) Reset state.
boolean	verbose() Check whether the visitor is verbose.

Method Detail

evaluator

public ActivityEvaluator evaluator()

Return the current activity evaluator.

Returns:

ActivityEvaluator current evaluator

evaluator

public void evaluator(ActivityEvaluator eval)

Set the current activity evaluator.

Parameters:

ActivityEvaluator - new evaluator

verbose

public boolean verbose()

Check whether the visitor is verbose.

Returns:

boolean whether visitor is verbose

prefix

public boolean prefix()

Whether to visit prior to visiting parent/children.

Returns:

boolean whether to visit prior

postfix

public boolean postfix()

Whether to visit after visiting parent/children.

Returns:

boolean whether to visit after

init

public boolean init(Tree tree)

Initialize state.

Parameters:

Tree - current tree instance

Returns:

boolean whether initialization succeeded

reset

public void reset(Tree tree)

Reset state.

Parameters:

Tree - current tree instance

again

public boolean again(Tree tree)

Whether to walk the tree again.

Parameters:

Tree - current tree instance

Returns:

boolean whether to walk again