org.onemind.commons.java.pattern
Class DynamicVisitor

java.lang.Object
  org.onemind.commons.java.pattern.DynamicVisitor

public abstract class DynamicVisitor

extends java.lang.Object

An abstract implementation of visitor that is extensible for handling different kind of object nodes by simple adding more methods. The subclass need to set up for handlers of node type in the constructor.

Version:

$Id: DynamicVisitor.java,v 1.2 2004/10/31 16:02:08 thlee Exp $ $Name: $

Author:

TiongHiang Lee (thlee@onemindsoft.org)

Nested Class Summary

protected class	DynamicVisitor.MethodNodeHandler A handler use reflection to invoke given method for visiting
static interface	DynamicVisitor.NodeHandler The handler

Constructor Summary

DynamicVisitor()
Constructor

Method Summary

protected void	addMethodNodeHandler(java.lang.Class type, java.lang.String methodName) Add MethodNodeHandler using the given method name throws RuntimeException if the method cannot be found.
protected void	addNodeHandler(java.lang.Class type, DynamicVisitor.NodeHandler handler) Add node handler
protected abstract void	initNodeHandlers() Initialize the node handlers
java.lang.Object	visit(java.lang.Object obj, java.lang.Object[] args) The object

Methods inherited from class java.lang.Object

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

Constructor Detail

DynamicVisitor

public DynamicVisitor()

Constructor

Method Detail

initNodeHandlers

protected abstract void initNodeHandlers()

Initialize the node handlers

addNodeHandler

protected void addNodeHandler(java.lang.Class type,
                              DynamicVisitor.NodeHandler handler)

Add node handler

Parameters:

type - the type

handler - the handler

addMethodNodeHandler

protected void addMethodNodeHandler(java.lang.Class type,
                                    java.lang.String methodName)

Add MethodNodeHandler using the given method name throws RuntimeException if the method cannot be found.

Parameters:

type - the type

methodName - the method name

visit

public java.lang.Object visit(java.lang.Object obj,
                              java.lang.Object[] args)
                       throws java.lang.Exception

The object

Parameters:

obj - the object

args - the arguments

Throws:

java.lang.Exception