Using the Decorator Pattern for a Real Web Site

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.