Pass filename as a variable to a swf file

Question

I want to pass a variable which will represent a filename to
a swf file from a hypertext link in an HTML document.
When the user clicks on the link which has
?variablename=filename_to_use appended to a "normal" link to a
page,
this variablename will be passed to the swf file.
I've already created this target swf file to have an
actionscript with a FLVPlayComponent with the filename hard-coded
in the actionscript. I want the actionscript to use the variable
representing the filename_to_use that was passed to from the URL
line.
The following is the actionscript that plays the flv file
taken from the Flash Help: Creating an Application with an
FLVComponent
ORIGINAL VERSION:
import mx.video.*;
this.attachMovie("FLVPlayback", "my_FLVPlybk", 10,
{width:320, height:240, x:100, y:100});
my_FLVPlybk.skin = "file:///install_drive|/Program
Files/Macromedia/Flash
8/en/Configuration/Skins/ClearOverPlaySeekMute.swf"
my_FLVPlybk.contentPath = "
http://www.helpexamples.com/flash/video/water.flv";
VERSION USING THE FILENAME FROM THE PASSED VARIABLE INSTEAD
OF WATER.FLV
import mx.video.*;
this.attachMovie("FLVPlayback", "my_FLVPlybk", 10,
{width:320, height:240, x:100, y:100});
my_FLVPlybk.skin = "file:///install_drive|/Program
Files/Macromedia/Flash
8/en/Configuration/Skins/ClearOverPlaySeekMute.swf"
my_FLVPlybk.contentPath = "
http://www.helpexamples.com/flash/video/variable";
I currently can play videos with this actionscript at my
school website but must make a separate swf for each video.
I want to be able to have one swf file that will play which
video was passed from the link in the HTML page.
I am using HTML page to lower the bandwidth so that users
won't have to load a swf file to see curricular material and then
perhaps choose a video on the topic.
http://www.wearekennedy.com/kent/whatsup.htm
click the link to the Spring curriculum map with resources
and then click on e.g. The_Food_Web video
Thank you,
Kevin Kent
Educator, John F. Kennedy H.S., Bronx, NY

Answer 1

You can use Liskov substitution/polymorphism:
DROP TYPE DEMO_T2
DROP TYPE DEMO_T1
DROP TYPE DEMO_ST
CREATE TYPE DEMO_ST AS OBJECT
( ID NUMBER,
  MEMBER PROCEDURE THIS_PROC)
NOT FINAL NOT INSTANTIABLE
CREATE TYPE DEMO_T1 UNDER DEMO_ST
( OVERRIDING MEMBER PROCEDURE THIS_PROC )
CREATE TYPE DEMO_T2 UNDER DEMO_ST
( OVERRIDING MEMBER PROCEDURE THIS_PROC )
CREATE TYPE BODY DEMO_T1 AS
OVERRIDING MEMBER PROCEDURE THIS_PROC AS
BEGIN
   DBMS_OUTPUT.PUT_LINE('DEMO_T1');
END;
END;
CREATE TYPE BODY DEMO_T2 AS
OVERRIDING MEMBER PROCEDURE THIS_PROC AS
BEGIN
   DBMS_OUTPUT.PUT_LINE('DEMO_T2');
END;
END;
CREATE OR REPLACE PROCEDURE DEMO_PRC ( P_OBJ DEMO_ST) AS
  V_OBJ DEMO_ST := P_OBJ;
BEGIN
  V_OBJ.THIS_PROC;
END;
-- TAKES AN OBJECT, NOT A PROCEDURE PER SE
-- BUT ALLOWS THE PROCEDURE TO BE PASSED WRAPPED IN AN
-- OBJECT
BEGIN
  DEMO_PRC( DEMO_T1(1) );
  DEMO_PRC( DEMO_T2(1) );
END;
DEMO_T1
DEMO_T2I believe that this is superior to the passing of function wrapped procedures as arguments because it is according to the intention of object orientation, whereas wrapping a procedure in a function is contrarty to the principles of good functional programming. Good practise in functional programming is to return a single strongly typed result, and produce no side effects. Since the procedure wrapped in a function is a procedure, it therefore implicitly have side effects.