Delving More Deeply into the Decorator Pattern - Adding Properties and Methods
(Page 2 of 4 )
Up to now, we’ve used a single string variable with a single getter method for the basic abstract component class. However, like any other class, this basic structure can accommodate more than a single variable or function. Example 4-17 shows three variables and getter functions. Save the script asComponent.as.
Example 4-17. Component.as
package
{
//Abstract class
public class Component
{
protected var soul:String="All that is inside a spirit";
protected var goodness:Number;
protected var vice:Number;
public function getSoul():String
{
return soul;
}
public function good():Number
{
return goodness;
}
public function evil():Number
{
return vice;
}
}
}
Like the previous examples, we begin with a string property,soul. (It’s assigned a string literal, but that’s really not necessary because it’s an abstract class and will never be seen or used—just a clarification.) Next, two numeric properties are defined,goodnessandvice. These two properties will collect all the accumulated good and evil in a soul.
Next, three getter functions are supplied to get the values of the string and two numeric variables. Now the abstract component class is all set to go.
Next: Multiple Concrete Components >>
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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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