little help on nodeSelectListener for different treeNodes

[meghiddo]

I have a tree that has projects, devices, and channels. I have two beans for this tree, one called DeviceChannels that holds each device and list of its channels, with these variables:

private String deviceName;
private String deviceId;
private String channelId;
List channelsList = new ArrayList();

Then I have ProjectHolder class to hold the name of each projects, and a List of this DeviceChannels class. Here are the variables:

private String projectName;
private String projectId;
List deviceAndChannels = new ArrayList();


In this way I am able to bind only the ProjectHolder class to the rich:tree, but since it has the List of DeviceChannels Objects I am able to get access to both Objects and only having to bind ProjectHolder to the rich:tree.

I am working on nodeSelectListener methods, but I have trouble with clicking any node other than the top project name node. Clicking that node I can have my code do whatever I need, such as pulling the IDs from that project node and the device cnd channel nodes beneath it.

But if I try to click on the second or third ndoes, I get these types of errors:

nodeSelectListener="#{treeClickBean.projectSelection}": java.lang.ClassCastException: nodesContainer.DeviceChannels cannot be cast to nodesContainer.TreeHolder

Here is the tree as it is now and the projectSelection method that nodeSelectListener calls:

<rich:tree nodeSelectListener="#{treeClickBean.projectSelection}" ajaxSubmitSelection="true" switchType="client"
 var="item" ajaxKeys="#{null}" reRender="projectForm">
 <rich:treeNodesAdaptor nodes="#{testNodesBean.projects}" var="projects">
 <rich:treeNode>
 <h:outputLink value="/NI/explorer_click/project.jsf">
 <h:outputText value="#{projects.projectName}" />
 </h:outputLink>
 </rich:treeNode>
 <rich:recursiveTreeNodesAdaptor roots="#{projects.deviceAndChannels}" var="device">
 <rich:treeNode>
 <h:outputLink value="/NI/explorer_click/device.jsf">
 <h:outputText value="#{device.deviceName}" />
 </h:outputLink>
 </rich:treeNode>
 <rich:recursiveTreeNodesAdaptor roots="#{device.channelsList}" var="channels">
 <rich:treeNode>
 <h:outputText value="#{channels}" />
 </rich:treeNode>
 </rich:recursiveTreeNodesAdaptor>
 </rich:recursiveTreeNodesAdaptor>
 </rich:treeNodesAdaptor>
 </rich:tree>










public void projectSelection(NodeSelectedEvent event){
 HtmlTree tree = (HtmlTree) event.getComponent();

 projectNode = (TreeHolder) tree.getRowData();
 projectId=projectNode.getProjectId();
 projectName=projectNode.getProjectName();

 deviceChannelsObject=projectNode.getDeviceAndChannels().get(projectNode.getDeviceindex());
 deviceId=deviceChannelsObject.getDeviceId();
 deviceName=deviceChannelsObject.getDeviceName();


 }

As you can see from the java code I can get the data from the child nodes just by clicking on the parent node, but I am having problems adjusting my java code to having the child nodes clicked on.

Should I make a separate method from projectSelection() or should I handle it in that same class?

Do I need to put separate nodeSelectListener attributes in the tree? Right now I just have one because calling that gives me access to all the data I need.

It seems like this should be handled in the java code there, because when I try to add a different nodeSelectListener to the device treeNode tag, it still gives me the same error from above.

I just need a little guidance on how to handle this.

[meghiddo]

Someone just tell me this..

Do I need to add another nodeSelectListener attribute that calls some other function to handle this on the rich:treeNode tag for device?

Or since projectSelection already gives me access to the data, is there a way to tell it which node is being selected in the case that it isnt the root node.

[nbelaevski]

Hi,

You can use instanceof operator:

if (object instanceof type) {
 type new_name = (type) object;

 }

[meghiddo]

Can you possibly clear it up a bit more? I have been trying variations on your advice, but havent seemed to get it right yet. I have till the end of the day to get this working so Im a little worried.

Should I leave the method as it is, accepting NodeSelectedEvent event as the parameters, or should that be changed to something more general?

public void projectSelection(NodeSelectedEvent event) {
}


it seems to me you are saying I only need the one nodeSelectListener attribute on my tree right? And it is going to call this method.

I just need if statements covering whether the node selected is a TreeHolder Object or a DeviceChannels Object.

So it seems like your saying I should do something like:

public void projectSelection(NodeSelectedEvent event){

 if (projectNode instanceof NodeSelectedEvent){
 HtmlTree tree = (HtmlTree) event.getComponent();
 projectNode = (MeasurementProject) tree.getRowData();
 projectId=projectNode.getProjectId();
 projectName=projectNode.getName();
 }

 if (deviceNode instanceof NodeSelectedEvent){
 ...
 }

 }

where projectNode is a TreeHolder Object instance and deviceNode is of DeviceChannels Object

the above gives me errors though (Incompatible conditional operand types MeasurementProject and NodeSelectedEvent)

and the other variations I have tried havent quite worked yet either.

I would keep trying until I get it, but like I said I have till tonight to get this working correctly.

[meghiddo]

Still no luck. Still trying, almost out of time though :(

[meghiddo]

Ill take one more chance
anyone know what I need to do to adjust my code to nbevalaeski's pseudo code?
I just cant seem to get it.

[nbelaevski]

MeasurementProject is definitely not an instance of NodeSelectedEvent, they have no common ancestor; and NodeSelectedEvent is class, not interface.

[meghiddo]

eh its too late now anyhow, my demo is in less than 2hrs and even if I did know exactly what to put in that if ()statement I doubt Id have time to implement it before then