UI command to delete file.

Question

hi,
i want to have a command for deleting a file .. it should be a button beside every resource which is being displayed in the KM folder (/documents/kumar).
i have seen https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/kmc/Knowledge%20Management%20and%20Collaboration%20Developers%20Guide.html >> COMMANDS and tried the URL redirect thing..
i have created a UI COmmand in KM and included that in the DetailsGroup_test (which i included in my layoutset_test for a navigation iView) but i don't see it..
code is as follows (same as given in the above link):
public class MyUICommand extends AbstractCommand {
      * redirecting to a URL
     public MyUICommand() {
          super("myButtonTextKey", "myTooltipTextKey");
     public ICommand getNewInstance() {
          return this.initNewInstance(new MyUICommand());
     public IRenderingEvent execute(IScreenflowData arg0) throws WcmException {
          return null;
     public String[] getTargetParameters() throws WcmException {
          return new String[0];
     public void setTargetParameters(List list, IResourceContext context)
          throws WcmException {
     public boolean isExecutable() {
          return true;
     /*** Prevents an event being fired.* The execute method will not be called.*/
     public boolean raisesEvent() {
          return false;
     /*** Causes a redirect to the specified URL* in the specified target frame.*/
     public LinkAttributes getLinkAttributes() {
          return new LinkAttributes("http://www.sap.com", "_blank");
i have also duplicated 'Commands for details menu' in Layoutset >>> MyGroup_new >> MyUICommand_alias
plz help. points assured
regards
kumar.

Answer 1

i tried to use the SDN example:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/documents/a1-8-4/implementing flexible ui one-step-screenflow.article
and i am getting ClassCastException:
[code] Please wait
Your request is being processed
System Error
An exception occurred during the program execution. Below you will find technical information pertaining to this exception that you might want to forward to your system administrator.
Exception Class: 
Call Stack java.lang.ClassCastException
        at com.sapportals.wcm.control.generic.WcmErrorControl.readInputData(WcmErrorControl.java:553)
        at com.sapportals.wdf.stack.Control.triggerInput(Control.java:473)
        at com.sapportals.wdf.WdfEventDispatcher.dispatch(WdfEventDispatcher.java:173)
        at com.sapportals.wdf.WdfCompositeController.onWdfEvent(WdfCompositeController.java:539)
        at sun.reflect.GeneratedMethodAccessor563.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at com.sapportals.htmlb.page.DynPage.doProcessCompositeEvent(DynPage.java:204)
        at com.sapportals.htmlb.page.DynPage.doProcessCurrentEvent(DynPage.java:142)
        at com.sapportals.htmlb.page.PageProcessor.handleRequest(PageProcessor.java:115)
        at com.sapportals.portal.htmlb.page.PageProcessorComponent.doContent(PageProcessorComponent.java:134)
        at com.sapportals.wcm.portal.component.base.ControllerComponent.doContent(ControllerComponent.java:73)
        at com.sapportals.portal.prt.component.AbstractPortalComponent.serviceDeprecated(AbstractPortalComponent.java:209)
        at com.sapportals.portal.prt.component.AbstractPortalComponent.service(AbstractPortalComponent.java:114)
        at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)
        at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)
        at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:189)
        at com.sapportals.portal.prt.component.PortalComponentResponse.include(PortalComponentResponse.java:215)
        at com.sapportals.portal.prt.pom.PortalNode.service(PortalNode.java:646)
        at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)
        at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)
        at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:189)
        at com.sapportals.portal.prt.core.PortalRequestManager.runRequestCycle(PortalRequestManager.java:753)
        at com.sapportals.portal.prt.connection.ServletConnection.handleRequest(ServletConnection.java:240)
        at com.sapportals.portal.prt.dispatcher.Dispatcher$doService.run(Dispatcher.java:522)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sapportals.portal.prt.dispatcher.Dispatcher.service(Dispatcher.java:405)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:390)
        at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)
        at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
        at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
        at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
        at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
        at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
        at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)[/code]        
i added the lines-of-code which are in BOLD below
[code]
public IRenderingEvent execute(IResource res, Event event) throws WcmException {
          if (event instanceof ConfirmEvent) {
               ConfirmEvent cce = (ConfirmEvent)event;
               if (ConfirmEvent.CHOICE_YES.equals(cce.getChoice())) {
<b>                    // do the action here ...
                    if(resource != null){
                           resource.delete();
                    } else {
                           return new RenderingEvent(
                           new CflStatusInfoEvent(StatusType.ERROR, "Resource null!"));
                    }</b>
               return new InfoEvent(Status.OK, "Done !");
               }     else if (ConfirmEvent.CHOICE_NO.equals(cce.getChoice())) {
                    return ConfirmComponent.onNo(event, res.getContext().getLocale());
               } else if (ConfirmEvent.CHOICE_CANCEL.equals(cce.getChoice())) {
                    return ConfirmComponent.onCancel(event, res.getContext().getLocale());
          return new InfoEvent(Status.ABORT, "Aborted.");
[/code]
plz help..
i am getting the menu in Details screen .. but, i should get the command in the KM folder beside every resource/file. .. how should i change it ..
regards.