ActionScript 3.0 Design Patterns.pdf - VideoTutorials-bg.com

Example 11-3. ConcreteStrategy.as
package
{
class ConcreteStrategy implements Strategy
{
public function think( ):void
{
trace("Great thoughts now...");
}
}
}
More Delegation in a Concrete Context
In a concrete context class as in Example 11-4, you can see that the work is delegated
to a concrete strategy class.
Example 11-4. ConcreteContext.as
package
{
class ConcreteContext extends Context
{
public function ConcreteContext( )
{
strategy = new ConcreteStrategy( );
}
}
}
Pulling All the Parts Together
Finally, to test the Strategy design pattern, Example 11-5’s script creates an instance
of the concrete context, but types the instance as a Context data type—an example of
programming to the interface and not the implementation.
Example 11-5. TestStrategy.as
package
{
import flash.display.Sprite;
}
public class TestStrategy extends Sprite
{
public function TestStrategy( )
{
var thinker:Context= new ConcreteContext( );
thinker.doStrategy( );
}
}
404 | Chapter 11: Strategy Pattern