ABAP OBJECTS: Dynamic Create object

Hi folks!
I have a problem... I need to create a dynamic type object with:
DATA: my_instance TYPE REF TO class1.
CREATE OBJECT my_instance TYPE (class2).
* where class1 is a superclass of class2.
When I do:
my_instance ?= m_parent.
* where m_parent is an instance of class1
My problem is when I want to access to an attribute of the class2, the compiler says that it cannot find the attribute (this is OK, because the attribute is only in the class2).
My question:
Is there anyway to access to an atribute of second class when is not in the first class? (i don't want to create the attribute as an attribute of the first class).
Thanx!!!!

Hi David,
When you do the debugging, you are dealing with run-time - i.e., the program is now running and you are just interrupting it at each statement to examine the program state. You will reach the point where the object is already created. That is why you can see all those attributes. But when you comiple, the program is not yet running, so the attributes will be unknown because of the dynamic type specification.
I think you will have to redesign the program logic. As i had already said in my earlier post, it is not proper to have the attributes specified statically while the class itself is specified dynamically.
Your situation is somewhat similar to -
DATA ITAB TYPE TABLE OF SPFLI.
PERFORM TEST TABLES ITAB.
FORM TEST TABLES ITAB.
LOOP AT ITAB.
WRITE: / ITAB-CARRID.
ENDLOOP.
ENDFORM.
Hope the point is clear.
Regards,
Anand Mandalika.

Similar Messages

Dynamically created object

Hi
I did not find any way of accessing a dynamically created
object by using notation this[id].
As the code below shows, only hard coded id objects are
recognised by this[id] notation.
Any way to do it ?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
creationComplete="init()">
<mx:Script>
<![CDATA[
import mx.controls.*;
public var l:Label;
public function init():void {
l = new Label();
l.id = 'label1';
l.text = 'firstname';
addChild(l);
public function fred(event:Event):void {
mytextarea1.text+=this['mytextarea1'].name + '\n';
mytextarea1.text+=this['label1'].name + '\n';
]]>
</mx:Script>
<mx:TextArea id="mytextarea1" width="1300"
height="200"/>
<mx:Button click="fred(event)" />
</mx:Application>

Thanks guys but I think my example is too simple compared to
my "real world" current problem ...
In my project, I dynamically create containers and children.
I'd like to reach directly a then dynamically created child by its
id, but notation this[id] is not recognised.
A better example : form f1 (id='form1) contains 2 labels (ids
'form1label1' and 'form1label2') ; f1 is included in form f0.
Calling this['form1label1'] crashed even though it is a
declared id control ! The same example using <mx> tags would
not crash...
And I have gone aroud 10000 articles but never found an
answer to this.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
creationComplete="init()">
<mx:Script>
<![CDATA[
import mx.controls.*;
import mx.containers.*;
public function init():void {
var f0:VBox = new VBox();
var f1:VBox = new VBox();
var l:Label;
f0.id = 'form0';
f1.id = 'form1';
l= new Label();
l.id = 'form1label1';
l.text = 'mobile';
f1.addChild(l);
l = new Label();
l.id = 'form1label2';
l.text = 'work';
f1.addChild(l);
f0.addChild(f1);
addChild(f0);
public function fred(event:Event):void {
mytextarea1.text+=Label( this['form1label1'] ).text + '\n';
]]>
</mx:Script>
<mx:TextArea id="mytextarea1" width="1300"
height="200"/>
<mx:Button click="fred(event)" />
</mx:Application>

Accessing dynamically created objects

If objects are created dynamically in AS3, using code like
this:
for (var num:Number = 0; num<10; num++){
var txtFld:TextField = new TextField();
txtFld.text = 'This is the original text';
this.addChild(txtFld);
then later, i want to changet the text of one of the
TextFields, how can I do that? The only instance listed in the
variables is a single instance of "txtFld" and it is the last one
that is created. How can I access the others?
Thanks

Two ways pop to my mind.
Give them a name property when you create them and then use
getChildByName().
Push each instance into an array/vector as you create it and
then iterate over the values in the array.
A combination of both?

Access dynamically created objects

Hello!
I create some images dynamically by running a for from 1 to a
variable preset. The pictures have the IDs image1, image2 ...
("image"+i). I then add other properties.
Problem is for each I need an onMouseOverHandler thant will
swap the image with another.
I can get the target image with event.currentTarget.id. But I
cannot set it's properties with this["image"+i].source (I need to
change the ones up to that as well) and I cannot access it with
this.getChildByName("image"+i).source either.
What am I doing wrong please?

"M*A*S*H 4077" <[email protected]> wrote in
message
news:go74q6$fbb$[email protected]..
> Hello!
>
> I create some images dynamically by running a for from 1
to a variable
> preset.
> The pictures have the IDs image1, image2 ...
("image"+i). I then add other
> properties.
>
> Problem is for each I need an onMouseOverHandler thant
will swap the image
> with another.
> I can get the target image with event.currentTarget.id.
But I cannot set
> it's
> properties with this["image"+i].source (I need to change
the ones up to
> that as
> well) and I cannot access it with
this.getChildByName("image"+i).source
> either.
>
> What am I doing wrong please?
ID is about as useful as your appendix when you create
objects dynamically.
The event.target property will contain a reference to your
image.

This[id] doesn't see dynamically created objects????

Hey all!
If i have
<mx:Canvas id="TopCanvas" initialize="Init()">
<mx:Canvas id="VisibleCanvas" >
</mx:Canvas>
</mx:Canvas>
<fx:Script>
function Init(){
var NewO = new Canvas();
NewO.id="InvisibleCanvas";
TopCanvas.addChild(NewO);
if (this["VisibleCanvas"]){
//We can see non-dynamically created canvas
if (this["InvisibleCanvas"]){
//ERROR we cannot see the new one!
Help please! How to access dynamically created Canvases via their id? I know i can save linkage to them in array, but i need to do it through id.
Cheers!

If you set the id property on a dynamically created instance, you can check
the id of an instance later if it happens to be a target of an event, for
example. But it will not be assigned to a variable in the document.
By default, MXML generates a non-dynamic class so you can't add properties
to it at runtime. You can set the name property and search the immediate
parent by calling getChildByName, but if the parent is not the document, you
still can't search the document.

HOW TO remove nodes add nodes dynamically create objects branchgroup

After much trial and error, frustration and reading this forum I have come across a good way to dynamically add/remove objects. This is working in my model with 1.3 and jdk 1.4.1_02 Sorry if its sloppy.
Here goes:
Adding objects (cap bits may not be optimised):
(A)
BranchGroup newDynObj = null;
switch (workerType)
case 1: //create a rawEntry BranchGroup
newDynObj = new RawEntry();
break;
case 2: //create a Finshed Node
newDynObj = new FinishedNode();
break;
default:
newDynObj.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
newDynObj.setCapability(BranchGroup.ALLOW_DETACH);
newDynObj.setCapability(Group.ALLOW_CHILDREN_READ);
newDynObj.setCapability(Group.ALLOW_CHILDREN_WRITE);
Transform3D t = new Transform3D();
t.set(scale, new Vector3d(xpos, ypos, zpos));
TransformGroup objTrans2 = new TransformGroup(t);
objTrans2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans2.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objTrans2.setCapability(TransformGroup.ALLOW_CHILDREN_READ);
objTrans2.setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
objTrans2.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
Sphere obj = new Sphere(1.0f, Sphere.GENERATE_NORMALS | Sphere.GENERATE_TEXTURE_COORDS,
5, app);
//add to scene graph
objTrans2.addChild(obj);
newDynObj.addChild(objTrans2);
newDynObj.compile();
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call this ftn with:
Space3DPanel.objTrans.addChild(createObject(createAppearance(workerType), 0.04, x, y, z, 2)); where objTrans is your tansformGroup
Removing branchgroup:
Its easy to add. But the trick is to delete/remove these !?! Detach doesnt seem to do anything. The method/pattern that works for me is to..
1. make a new class subclassing BranchGroup like this:
public class FinishedEntry extends BranchGroup
{ private String type;
public FinishedEntry(){ }
public FinishedEntry(String type)
{ this.type = type; }
and
public class RawEntry extends BranchGroup
private String type;
public RawEntry(){ }
public RawEntry(String type)
{ this.type = type;}
2. To when adding the BG to the TG of the parent (objTrans)
add a BG of the type you subclassed.
see (A) above.
3. Now scan through the children of the TG that you have been adding these children to. Like this:
static synchronized public void removeNodeFromModel(int workerType)
try {
switch (workerType)
case 1: //raw Entry
for (int i = 0; i < Space3DPanel.objTrans.numChildren(); i++)
if (Space3DPanel.objTrans.getChild(i) instanceof RawEntry)
Space3DPanel.objTrans.removeChild(i);
break;
break;
case 2: //result Entry
for (int i = 0; i < Space3DPanel.objTrans.numChildren(); i++)
if (Space3DPanel.objTrans.getChild(i) instanceof FinishedNode)
Space3DPanel.objTrans.removeChild(i);
break;
} //end for
break;
default:
} catch (Exception e) { e.printStackTrace(); }
The main idea is to use instanceof !! then use removeChild (see above).. Also, you can compile your BGs using this method.
Thanks for the great forum!
Jacob Pyrett
[email protected]

First, to add child nodes to a branch group, you must follow two rules:
(1) The child you are adding to the branch group is also a BranchGroup
(2) The BranchGroup.ALLOW_CHILDREN_EXTEND capability is set
From here, you are able to add children on the fly.
To remove a child from the branch group was harder to figure out, but I eventually got it to work. To accomplish this you must do the following:
(1) have the capability BranchGroup.ALLOW_DETACH) set on the child BranchGroup you wish to remove.
(2) call the child's detach() method rather than calling the parent's removeChild()
Hope this helps.

Dynamically create objects at runtime - Collections?

Dear Experts
During runtime i need to create several objects. Can you help me by pointing out the best practice here? Is it possible to store Man and Dog object in the single collection?
Thank you for the help
The code is as follows
abstract class Mammal {
    String name;
    Mammal(String n)
        name = n;
    void sleep()
        System.out.println( name + "! is asleep! zzzzzzz!");
    abstract void talk();
class Man extends Mammal {
    Man(String n)
        super(n);
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        System.out.println("H1 My Name is "+name+" How do you do?");
class Dog extends Mammal {
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public class Main {
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standman wrote:
thank you
i tried this. If it is wrong please let me know. If all you need is a List, it may work fine. I didn't try it. Some suggestions:
Declare 'al' as a List:
List al = new ArrayList();Then if you decide you need a LinkedList or other List, you only have to change the right side construction.
Try to use generics (as YoungWinston suggested).
Use an Iterator or an "enhanced 'for' loop" for the iteration, instead of constantly checking "size" and using "get(i)". Since you have a short random-access list (ArrayList), your loop may work okay. But, if you had a long non-random-access list (such as LinkedList), an Iterator or "enhanced 'for' loop" (which uses an Iterator behind-the-scenes) would work faster.
If you do need thread-safety, there are other considerations, too.

Preloading dynamically created objects

Hi,
I have some Object I would like to create on runtime, but it initialization takes some time. So normally I would code something like
Class SimpleFoo
private BigObject bO = new bO("parameters here");
BigObject getBigObject()
return bO;
}but now I have a lot (say around 30 in the total class, which is more complicated) of them, so it would be something like
Class MessyFoo
private BigObject bOprime = new bO("prime parameters here");
private BigObject bOeven = new bO("even parameters here");
BigObject getBigObject(int i)
if (isPrime(i))
return bOprime;
else if (isEven(i))
return bOeven;
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Class CleanLookingFoo
BigObject getBigObject(int i)
if (isPrime(i))
   return new bO("prime parameters here");
else if (isEven(i))
    return new bO("even parameters here");
}but then I miss the caching and initialization advantages. What is the best way to build this? So far my best option is to pre-process the CleanLookingFoo and make a MessyFoo out of it, and then pass it through to the Java compiler, which probably isn't the best solution.

The usual pattern is to use a synchronization mechanism and a lazy initialiser. The simplest mechanism is to use a holder class with a static field, since it won't get initialised until it's first used:
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          switch (i) {
               case 0: {
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          getBigObject(1);
}Output:
getBigObject called with 0
prime parameters here
getBigObject called with 1
even parameters here
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someone please explain to me what i have to do like explaining to
an 8 year old. Thank you!
Here's the code:

To use the getChildByName method you want to cast a MovieClip
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Dynamically create object

i want to write a program that need to connect database.
The table should be like this:
uid, type
1, input
2, password
3, report
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Thank you!
i have used forName and newInstance to solve my problem.

Dynamic creating SAPBobsCOM objects using reflection

Hi All,
I'm writing a tool (C#) for SBO for exporting object (oItems, oBanks etc.) to XML files. And I have a problem how to dynamically create object by it's string description. I'm trying to create it using System.Reflection, but cant't find right way to create it.
It must be like that, but it doesn't work:
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Hi
I've writen this code for instantiating DI API objects using .NET reflection
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Regards

Why objects are dynamically created in java

Why objects are dynamically created in java even if dynamically created object requires more space & more memory references as compared to static object?

I don't even know where to start...
KAMAL.MUKI wrote:
Why objects are dynamically created in javaWhat is the alternative?
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as compared to static object?Can you define "static object"?
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CREATE OBJECT in OOP

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Those are the values passed to the constructors, check the method constructor of the class and its parameters.

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or
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CREATE TABLE DUP_EMP AS SELECT * FROM EMP;
its called CTAS (Create Table As Select).

Is it possible to dynamically create form fields in PDF form?

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ABAP OBJECTS: Dynamic Create object

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