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

Example 2-8. IPrintjob.as
package printcenters
{
public interface IPrintjob
{
function start(fn:String):void;
}
}
Example 2-9 and Example 2-10 show the two concrete print job classes that implement
the IPrintjob interface.
Example 2-9. InkjetPrintjob.as
package printcenters
{
internal class InkjetPrintjob implements IPrintjob
{
public function start(fn:String):void
{
trace("Printing '" + fn + "' to inkjet printer");
}
}
}
Example 2-10. WorkgroupPrintjob.as
package printcenters
{
internal class WorkgroupPrintjob implements IPrintjob
{
public function start(fn:String):void
{
trace("Printing '" + fn + "' to workgroup printer");
}
}
}
Creator Classes: Print Centers
Example 2-11 shows the class PrintCenter that should behave as an abstract class.
The factory method is called createPrintjob( ), and client access to the printer centers
is through the print( ) method.
Example 2-11. PrintCenter.as
package printcenters
{
import flash.errors.IllegalOperationError;
// ABSTRACT Class (should be subclassed and not instantiated)
public class PrintCenter
76 | Chapter 2: Factory Method Pattern