wt.visitor
Class Navigator

java.lang.Object
  wt.visitor.BasicWalker
      wt.visitor.Navigator

All Implemented Interfaces:

Walker

Direct Known Subclasses:

BFSWalker, DFSWalker

Deprecated. Use wt.visitor.Walker

public abstract class Navigator

extends BasicWalker

This abstract class is responsible for controlling the overall search mechanism. It includes a single abstract traverse() method that provides multi-level navigation of associations between Persistable objects. Depth-first traversal is an example of an implementation. It uses a NodeExpander object to do the actual expansion of nodes. It also is responsible for calling the visit methods on the Visitor object as the structure is traversed. If any visit method returns a boolean false value, then that node will not be traversed any further.

Descendant classes are also responsible for maintaining a list of nodes that have been visited. This is used to pass a flag to the Visitor's visit operation. As a convenience, registerVisitedNode() and clearVisitedNodes() methods are implemented in this base class.

Supported API: false

Extendable: false

Field Summary

private static String	CLASSNAME Deprecated.
private static String	RESOURCE Deprecated.

Fields inherited from class wt.visitor.BasicWalker

Fields inherited from interface wt.visitor.Walker

NODE_EXPANDER, VISITOR

Constructor Summary

Navigator()
Deprecated.

Methods inherited from class wt.visitor.BasicWalker

clearVisitedNodes, getNodeExpander, getVisitor, isRecursionDetectionEnabled, registerVisitedNode, setNodeExpander, setRecursionDetectionEnabled, setVisitor

Methods inherited from class java.lang.Object

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

Methods inherited from interface wt.visitor.Walker

traverse

Field Detail

RESOURCE

private static final String RESOURCE

Deprecated.

See Also:

Constant Field Values

CLASSNAME

private static final String CLASSNAME

Deprecated.

Constructor Detail

Navigator

public Navigator()

Deprecated.