Using the Decorator Pattern for a Real Web Site - Hybrid car classes concrete component
(Page 2 of 6 )
The four hybrid autos are placed into separate concrete component classes that are all subclassed from the Auto class. The constructor function assigns a value to the information property, and the price() function returns a value representing the car’s price. In Examples 4-39 to 4-42, the captions are the filenames to use for saving each class.
Example 4-39. Prius.as
package
{
public class Prius extends Auto
{
public function Prius()
{
information = "Toyota Prius Hybrid~\n";
}
override public function price():Number
{
return 21725.00;
}
}
}
Example 4-40. Mariner.as
package
{
public class Mariner extends Auto
{
public function Mariner()
{
information = "Mercury Mariner Hybrid~\n";
}
override public function price():Number
{
return 29225.00;
}
}
}
Example 4-41. Accord.as
package
{
public class Accord extends Auto
{
public function Accord()
{
information = "Accord Hybrid~\n";
}
override public function price():Number
{
return 30990.00;
}
}
}
Example 4-42. Escape.as
package
{
public class Escape extends Auto
{
public function Escape()
{
information = "Ford Escape Hybrid\n~";
}
override public function price():Number
{
return 26240.00;
}
}
}
The prices here are based on prices found on the Internet, but they may or may not reflect prices at a later date. If you want to update prices or even use different autos, feel free to do so.
The\nescape character and the tilde (~) characters are used for formatting purposes. The\nis a line break, and the tilde (~) helps in separating out all the different models that become a big string as the decorator merges them altogether. Without these, the output would be a mess.
Next: Using Auto Options as Decorators >>
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 This article is excerpted from chapter four of ActionScript 3.0 Design Patterns Object Oriented Programming Techniques, written by William B. Sanders and Chandima Cumaranatunge (O'Reilly, 2007 ISBN: 0596528469). Check it out today at your favorite bookstore. Buy this book now.
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