wt.visitor
Class CompositeVisitor

java.lang.Object
  wt.visitor.CompositeVisitor

All Implemented Interfaces:

Visitor

Direct Known Subclasses:

ObjectGraphCallback

public class CompositeVisitor

extends Object

implements Visitor

This class provides a mechanism for supporting more than one Visitor object that can be visited during a single traversal. This class contains a Vector of Visitor objects that can be added to or removed from. It implements the visit methods by calling the corresponding visit methods in each of the contained Visitor objects and returning the logical OR of their return values.

Supported API: true

Extendable: true

Field Summary

private static String	CLASSNAME
private static String	RESOURCE
private Vector	visitors

Constructor Summary

CompositeVisitor()

Method Summary

void	addVisitor(Visitor a_visitor) Adds a Visitor instance to the contained list of Visitors.
protected Vector	getVisitors()
void	removeVisitor(Visitor a_visitor) Removes the Visitor instance from the contained list of Visitors.
boolean	visit(Persistable fromNode, Link link, Persistable toNode, int level, boolean previouslyVisited) Visit a node.
boolean	visitLevel(Persistable fromNode, Vector links, Vector toNodes, int level) Vist nodes at this level.
boolean	visitLevel(Vector fromNodes, Vector links, Vector toNodes, int level) Vist nodes at this level.
private Vector	visitors()

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE

private static final String RESOURCE

See Also:

Constant Field Values

CLASSNAME

private static final String CLASSNAME

visitors

private Vector visitors

Constructor Detail

CompositeVisitor

public CompositeVisitor()

Method Detail

addVisitor

public void addVisitor(Visitor a_visitor)

Adds a Visitor instance to the contained list of Visitors.

Supported API: true

Parameters:

a_visitor -

removeVisitor

public void removeVisitor(Visitor a_visitor)

Removes the Visitor instance from the contained list of Visitors.

Supported API: true

Parameters:

a_visitor -

visit

public boolean visit(Persistable fromNode,
                     Link link,
                     Persistable toNode,
                     int level,
                     boolean previouslyVisited)
              throws WTException

Visit a node. If false is returned, then the node will not be traversed.

Supported API: true

Specified by:

visit in interface Visitor

Parameters:

fromNode -

link -

toNode -

level -

previouslyVisited -

Returns:

boolean

Throws:

WTException

visitLevel

public boolean visitLevel(Persistable fromNode,
                          Vector links,
                          Vector toNodes,
                          int level)
                   throws WTException

Vist nodes at this level. If false is returned, then none of the nodes on this level will be traversed.

Supported API: true

Specified by:

visitLevel in interface Visitor

Parameters:

fromNode -

links -

toNodes -

level -

Returns:

boolean

Throws:

WTException

visitLevel

public boolean visitLevel(Vector fromNodes,
                          Vector links,
                          Vector toNodes,
                          int level)
                   throws WTException

Vist nodes at this level. If false is returned, then none of the nodes on this level will be traversed.

Supported API: true

Specified by:

visitLevel in interface Visitor

Parameters:

fromNodes -

links -

toNodes -

level -

Returns:

boolean

Throws:

WTException

visitors

private Vector visitors()

getVisitors

protected Vector getVisitors()