model

Class VisitorDemoModel

java.lang.Object

model.VisitorDemoModel

public class VisitorDemoModel
extends java.lang.Object

The main model object for the Visitor Demo system.

Author:

swong

Field Summary

Fields

Modifier and Type	Field and Description
private IPaintCmd	paintCmd The installed IPaintCmd instance.
private IViewAdapter	view The adapter out to the view

Constructor Summary

Constructors

Constructor and Description
VisitorDemoModel(IViewAdapter view) Teh cosntructor for the class

Method Summary

Methods

Modifier and Type	Method and Description
IHost[]	getHosts() Get an array of the available host types, i.e.
private IVisitor	loadVisitor(java.lang.String classname) Utility method to load a visitor given its classname, without the leading "visitors.impl.".
void	paint(java.awt.Graphics g) Paint on the given Graphics object using the current IPaintCmd object in the model.
java.lang.Object	run(IHost host, java.lang.String visitorClassname) Return the results of having the given host object execute the visitor corresponding to the given class name.
void	setPaintCmd(IPaintCmd cmd) Set the model's IPaintCmd instance to the given instance.

Methods inherited from class java.lang.Object

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

Field Detail

view

private IViewAdapter view

The adapter out to the view

paintCmd

private IPaintCmd paintCmd

The installed IPaintCmd instance. Initially set to a no-op cmd.

Constructor Detail

VisitorDemoModel

public VisitorDemoModel(IViewAdapter view)

Teh cosntructor for the class

Parameters:

view - the adapter to the view

Method Detail

getHosts

public IHost[] getHosts()

Get an array of the available host types, i.e. IHost subclasses.

Returns:

run

public java.lang.Object run(IHost host,
                   java.lang.String visitorClassname)

Return the results of having the given host object execute the visitor corresponding to the given class name. A reference to this model object is given as the visitor's input parameter.

Parameters:

host - An IHost object

visitorClassname - The name of the visitor class, without the leading "visitors.impl."

Returns:

The results of the visitor execution on the given host.

loadVisitor

private IVisitor loadVisitor(java.lang.String classname)

Utility method to load a visitor given its classname, without the leading "visitors.impl.".

Parameters:

classname - the visitor's classname

Returns:

An IVisitor object

setPaintCmd

public void setPaintCmd(IPaintCmd cmd)

Set the model's IPaintCmd instance to the given instance. The view is called to repaint after setting the paint cmd so the results on the viwe will show up.

Parameters:

cmd - The new IPaintCmd

paint

public void paint(java.awt.Graphics g)

Paint on the given Graphics object using the current IPaintCmd object in the model.

Parameters:

g - The Graphics context on which to draw.