treeNode cast problem

[Psidoler]

Hello,

I use GWT 2.2 and SGWT 2.4.

I have a custom TreeGrid (PatientTree), a custom DataSource (ClinicalDS) and a custom TreeNode (CliniCalNode).
I want to load on datasource children of a node when I open parent node/folder. Everything is ok on the first level of nodes. I open the parent, children are loaded !
But when I want to open newly created children, a cast exception occurs:

java.lang.ClassCastException: com.smartgwt.client.widgets.tree.[B]TreeNode
cannot be cast to[/B]
org.ub.le2i.[B]ClinicalNode
[/B]

Here are my classes :

class [B]PatientTree [/B] extends TreeGrid{

    ClinicalDS ds;

    public [B]PatientTree[/B](){
        ds = new ClinicalDS();
        ds.initialize();
        this.setDataSource(ds);
    
         [B]addFolderOpenedHandler[/B](new FolderOpenedHandler() {
            public void onFolderOpened(FolderOpenedEvent event) {
               
               ClinicalNode node = (ClinicalNode) event.getNode();           // CAST EXCEPTION
                ds.[B]addChildren[/B](node);
            }
        });
    }
}

class [B]ClinicalDS[/B] extends DataSource{
    public void [B]initialize[/B](){
  
        // load patients from database : List<Patient>  patients;
        for (Patient patient : patients){
            [B]ClinicalNode [/B]child = new [B]ClinicalNode[/B](patient);
            addData(child);
        }
    }

    public void [B]addChildren[/B](ClinicalNode parent){
  
        // load samples from database : List<Sample>  samples;
        for (Sample sample: samples){
            [B]ClinicalNode [/B]child = new [B]ClinicalNode[/B](sample);
            child.setParent(parent);
            addData(child);
        }
    }

}

class [B]ClinicalNode[/B] extends TreeNode{

    private Object object;

    public ClinicalNode([B]Patient [/B]patient){
        // setAttributes, etc.

        object = patient;    // this is why I need a custom TreeNode
    }

    public ClinicalNode([B]Sample [/B]sample){
        // setAttributes, etc.

        object = sample;
    }

}

some screenshots :
- 1.png => first level loaded by ds.initialize() => OK
- 2.png => second level loaded by ds.addchild() => OK
- 3.png => I log the toString() of the node => first line : click on Patient1 OK, second line click on Prel1 KO

thanks ;)

Pierre

[Psidoler]

I check the child object type during the "addChildren" and during the "openFolder" with a sout

node.getAttribute("objectName")+":"+node.toString()

"Prel1" object during the addChildren :

[B]Prel1[/B]:org.ub.le2i.[B]ClinicalNode[/B]@2a170174

"Prel1" object during the openFolder:

[B]Prel1[/B]:com.smartgwt.client.widgets.tree.[B]TreeNode[/B]@585d78f8

As you can see, the type and the object IDs are not the same... It's smells like if the ClinicalNode a been copy to a new TreeNode object during the "on the fly" loading.

[Psidoler]

Last precison, my problems occurs in Dev-Mode AND in "normal" mode. on FF 3.6, FF 4, IE 8, IE 9, Chrome 11.0

[Psidoler]

any updates or another way to have the nedded behaviour ?

[Psidoler]

Hello,

I have find the problem. It's come from RPC calls. When I try to load children during the RPC callback, my nodes have the bad type. When I try a fake load without RPC it's OK.

Here is the addChildren from RPC:

    public void addChildren(ClinicalNode parent){

        // RPC CALL (load samples from database)
   [B]SampleServiceAsync service = SampleService.Util.getInstance();
        service.getSamples[/B](parent.getAttribute("objectName"), new AsyncCallback<List<Sample>>() {

            public void onFailure(Throwable caught) {}

            public void [B]onSuccess[/B](List<Sample> result) {

                for (Sample sample: result){
                    ClinicalNode child = new ClinicalNode(sample);
                    child.setParent(parent);
                    addData(child);
                }
            }
    }

Here is the fake (but working) addChildren without RPC:

    public void addChildren(ClinicalNode parent){

        Sample fakeSample1 = new Sample();
        fakeSample1.setName("fakeSample1");
        // etc.
        Sample fakeSample2 = new Sample();
        fakeSample2.setName("fakeSample2");
        // etc.
     
        List<Sample>  samples = new ArrayList<Sample>();
        samples.add(fakeSample1);
        samples.add(fakeSample2);

        for (Sample sample: samples){
            ClinicalNode child = new ClinicalNode(sample);
            child.setParent(parent);
            addData(child);
    }

How can I bypass this problem ?