Improve your UI code with Strategy Pattern

This article is intended to provide a brief introduction to the Strategy Design Pattern, and how can help us to improve our User Interface code.

The scenario – A simple blogging application

You have a blog application and you want to limit user actions based on their roles.
You have the following roles:

• User
• Writer
• Editor

and the following actions:

• New Post – Creates a new blog post
• Edit Post – Edits an existing blog post
• Submit Post – Submits a post for approval
• Reject Post – Rejects a previously submitted blog post
• Publish Post – Publishes a previously submitted blog post

The table below shows the actions per role type

Actions	User	Writer	Editor
New post		x
Edit post		x
Submit post		x
Reject post			x
Publish post			x

Role type is represented by an enumeration:

public enum RoleType
{
    User,
    Writer,
    Editor
}

What’s the best solution for our problem?