com.interface21.core
Class PrettyPrintVisitor

java.lang.Object
  |
  +--com.interface21.core.PrettyPrintVisitor

All Implemented Interfaces:

Visitor

public class PrettyPrintVisitor

extends java.lang.Object

implements Visitor

Test visitor. Useful during development. Produces console output as it visits each node that shows the tree's structure.

Version:

1.0

Author:

Rod Johnson

Constructor Summary

PrettyPrintVisitor()
Creates new PrettyPrintVisitor

Method Summary

boolean	enterComposite(Visitable host, int depth) Begin a visit to a composite element, with subnodes.
void	exitComposite(Visitable host) End a visit to a composite element, with subnodes
void	visitLeaf(Visitable host, int depth) Make an entire visit to a terminal node

Methods inherited from class java.lang.Object

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

Constructor Detail

PrettyPrintVisitor

public PrettyPrintVisitor()

Creates new PrettyPrintVisitor

Method Detail

visitLeaf

public void visitLeaf(Visitable host,
                      int depth)

Make an entire visit to a terminal node

Specified by:

visitLeaf in interface Visitor

Parameters:

host - node to be visited

depth - depth of traversal (starting at 0)

enterComposite

public boolean enterComposite(Visitable host,
                              int depth)

Begin a visit to a composite element, with subnodes. Return false to just treat it as a terminal.
Note that either this method or exitComposite(), depending on implementation, must do the actual visit to the composite, as visit() will never be called on this node unless this method returns false.

Specified by:

enterComposite in interface Visitor

Parameters:

host - Node accepting the Visitor

depth - current depth in traversal, starting at 0.

Returns:

true to treat this as a composite, and traverse any children; false to treat it as a terminal, ignoring any children.

exitComposite

public void exitComposite(Visitable host)

End a visit to a composite element, with subnodes

Specified by:

exitComposite in interface Visitor

Parameters:

host - node visited