How to do objectexist in 2017

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question

Marco Baccalaro asked Jan 11 2017 at 3:41 PM Matthew Gillespie commented Apr 24 2017 at 6:06 PM

How to do objectexist in 2017

I read that the objectexists is deprecated and to use treenode.rank instead.

How do I have to do it correctly? I'm not sure I'm doing it in the correct way.

If I do like this I get an exception when object does not exist:

Object box = item.first;
if (box.rank)
	box.color = Color(1,0,0);

Software Version:

FlexSim 17.0.0

flexscript dot syntax rank objectexists

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Answer 1 · 2017-01-11T16:58:54Z

Matthew Gillespie answered Jan 11 2017 at 4:58 PM Matthew Gillespie commented Apr 24 2017 at 6:06 PM

The treenode.rank line is a copy-paste mistake. If the object doesn't exist the variable should be null and so you just put the variable into an if statement.

Object box = model().find("Queue1").first;
if(box)
	box.color = Color.red;

· 19

Sebastian Hemmann commented · Apr 12 2017 at 5:46 PM

And how does this work, if I want to know if a Label exists?

1 ·

Matthew Gillespie ♦♦ Sebastian Hemmann commented · Apr 12 2017 at 5:59 PM

You would need to get a reference to the label node:

if(box.labels["myLabel"])
	box.color = Color.red;

0 ·

Cameron Pluim Sebastian Hemmann commented · Apr 12 2017 at 7:45 PM

Similar to @Matthew Gillespie's comment, you could also use:

if(box.myLabel?)
        box.color = Color.red;

0 ·

Matthew Gillespie ♦♦ Cameron Pluim commented · Apr 12 2017 at 7:52 PM

Using the ? in this case would give you slightly different behavior depending on what the value of the label is:

//myLabel = 0
 
if(box.labels["myLabel"])	//true
if(box.myLabel?)		//false
 
//myLabel = 1
 
if(box.labels["myLabel"])	//true
if(box.myLabel?)		//true
 
//myLabel doesn't exist
 
if(box.labels["myLabel"])	//false
if(box.myLabel?)		//false

3 ·

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Ralf Gruber ♦ commented · Apr 12 2017 at 6:15 PM

Would this be ok to use, if looking for a label "MyLabel" on Queue1 in the model? Or is there a better way?

treenode thelabel = model().find("Queue1>labels/MyLabel");
if(thelabel)
	return thelabel.value;

1 ·

Matthew Gillespie ♦♦ Ralf Gruber ♦ commented · Apr 12 2017 at 6:24 PM

If you just want to get the value of the label if the label exists there is an easier way to do this using the ? operator:

return model().find("Queue1").MyLabel?;

Your code works, but the preferred way to get a label node is using the labels property:

treenode thelabel = model().find("Queue1").labels["MyLabel"];

0 ·

Ralf Gruber ♦ Matthew Gillespie ♦♦ commented · Apr 13 2017 at 1:07 PM

@Matthew Gillespie,

seems I am too stupid to figure this out by myself: Attached is a model as a sample. OnEntry of the Queue, I create a label MyLabel with the value of "1" on 50% of all items. On sendtport of that Queue, I want to send the item through the label value's port number ("1"), if the label exists and through port 2, if it does not exist.

Everything I tried does not work or throws an exception, because the label does not exist.

Can you please help me (and @christoph gruber) here?

Thanks

iflabeldoesnotexist.fsm

0 ·

iflabeldoesnotexist.fsm (19.3 KiB)

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christoph gruber commented · Apr 13 2017 at 12:02 PM

Sorry, but I do not understand exectly:

//myLabel doesn't exist
 if(item.labels["myLabel"] == 0){
     msg ("Info", "Label myLabel doesen´t exist!");
}

This code does not work in 17.03 - it only works in 17.1!

But why doesn´t work the code below in 17.1?

@Ralf Gruber ; @Matthew Gillespie

//myLabel exist
if (item.labels["CControl"] == 1){
    msg ("Info", "Label myLabel exist!");
}

0 ·

Matthew Gillespie ♦♦ christoph gruber commented · Apr 13 2017 at 4:06 PM

You shouldn't be comparing the label node to 0 or 1. If the label does exist it will return a valid treenode (which doesn't equal 1 or 0) and if it doesn't exist it will return nullvar (which also doesn't equal 1 or 0). So your code examples should look like this:

//myLabel doesn't exist
 if(!item.labels["myLabel"]){
     msg ("Info", "Label myLabel does not exist!");
}
 
//myLabel exist
if (item.labels["myLabel"]){
    msg ("Info", "Label myLabel exists!");
}

0 ·

Arun Kr commented · Apr 23 2017 at 8:47 AM

I am getting invalid exception error for the following code.

Object Box = current.subnodes[2];
if(Box)
{
		 current.color = Color.black;
}

Also see the attached model. The code is written in the process finish trigger of the processor.

objectexists-error.fsm

0 ·

objectexists-error.fsm (13.8 KiB)

Mischa Spelt Arun Kr commented · Apr 24 2017 at 8:19 AM

Have you checked that the current node actually has two subnodes?

if(current.subnodes.length >= 2)
{
	Object box = current.subnodes[2];
	current.color = Color.black; // Did you mean: box.color = .. ?
}

0 ·

Arun Kr Mischa Spelt commented · Apr 24 2017 at 8:34 AM

Hi Misha,

Thanks for the reply, your code will help.

The current doesn't have two sub nodes, only one. Conceptually, objectexists condition using

 if(current.subnodes[2])
{
		 current.color = Color.black;//I meant current.color only
}

shouldn't throw an exception right?

Regards,

Arun KR

0 ·

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