mwalk.visitor
Class DataVisitor

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

public class DataVisitor

extends AbstractVisitor

implements DownVisitor

A visitor that assigns data elements to each node in the tree from an ecternal file. The file should be formatted with each line containing a node's adress and the associated data separated by a space.

Version:

1.0

Author:

Robert Chalmers

Field Summary

private static java.lang.String	CFG_BASE Base of keys in configuration file
protected java.util.Properties	data List of data items keyed by the node's address
protected java.lang.String	def_filename Default filename if none supplied
protected java.lang.String	filename Filename to use for data
protected java.lang.String	type Type of data - used as node's hash key

Fields inherited from class mwalk.visitor.AbstractVisitor

CFG_BASE, eval, seen, verbose

Constructor Summary

DataVisitor()
Default constructor.

DataVisitor(java.lang.String filename)
Constructor.

Method Summary

java.lang.String	getFilename() Retrieve the current filename.
boolean	init(Tree tree) Initialize visitor.
boolean	prefix() Whether to visit prior to visiting parent/children.
void	setFilename(java.lang.String filename) Set the current filename prior to init().
java.lang.Object	visitDown(Tree tree, TreeNode node) Visit the current node prior to visiting children.

Methods inherited from class mwalk.visitor.AbstractVisitor

again, cfgBoolean, cfgInt, cfgString, cfgVisitor, evaluator, evaluator, getChildren, getParents, getReceivers, haveSeen, haveVisited, markSeen, markVisited, nextReceiver, postfix, reset, verbose, visitDown, visitUp, visitUp, walkDown, walkUp

Methods inherited from class java.lang.Object

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

Field Detail

CFG_BASE

private static final java.lang.String CFG_BASE

Base of keys in configuration file

filename

protected java.lang.String filename

Filename to use for data

def_filename

protected java.lang.String def_filename

Default filename if none supplied

type

protected java.lang.String type

Type of data - used as node's hash key

data

protected java.util.Properties data

List of data items keyed by the node's address

Constructor Detail

DataVisitor

public DataVisitor()

Default constructor.

DataVisitor

public DataVisitor(java.lang.String filename)

Constructor.

Parameters:

String - new default filename

Method Detail

getFilename

public java.lang.String getFilename()

Retrieve the current filename.

Returns:

String current filename

setFilename

public void setFilename(java.lang.String filename)

Set the current filename prior to init().

Parameters:

String - new filename

prefix

public boolean prefix()

Description copied from interface: Visitor

Whether to visit prior to visiting parent/children.

Overrides:

prefix in class AbstractVisitor

Tags copied from interface: Visitor

Returns:

boolean whether to visit prior

init

public boolean init(Tree tree)

Initialize visitor.

Overrides:

init in class AbstractVisitor

Parameters:

Tree - current tree instance

visitDown

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

Visit the current node prior to visiting children.

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