Replaced IRootVMLayoutNode.getRootObject() with IVMProvider.getRootElement() (bug 195182).

plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/expression/ExpressionVMProvider.java

@@ -11,7 +11,6 @@
 package org.eclipse.dd.dsf.debug.ui.viewmodel.expression;
 
 import org.eclipse.dd.dsf.debug.service.IFormattedValues;
-import org.eclipse.dd.dsf.debug.ui.viewmodel.DebugViewSelectionRootLayoutNode;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.formatsupport.IFormattedValuePreferenceStore;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.register.RegisterGroupLayoutNode;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.register.RegisterLayoutNode;
@@ -25,6 +24,7 @@ import org.eclipse.dd.dsf.ui.viewmodel.IVMContext;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.dm.AbstractDMVMProviderWithCache;
+import org.eclipse.dd.dsf.ui.viewmodel.dm.DMVMRootLayoutNode;
 import org.eclipse.debug.core.DebugPlugin;
 import org.eclipse.debug.core.IExpressionsListener;
 import org.eclipse.debug.core.model.IExpression;
@@ -71,7 +71,7 @@ public class ExpressionVMProvider extends AbstractDMVMProviderWithCache
         /*
          *  Create the top level node which provides the anchor starting point.
          */
-        IVMRootLayoutNode debugViewSelectionNode = new DebugViewSelectionRootLayoutNode(this); 
+        IVMRootLayoutNode debugViewSelectionNode = new DMVMRootLayoutNode(this); 
         
         /*
          * Now the Overarching management node.
@@ -145,7 +145,7 @@ public class ExpressionVMProvider extends AbstractDMVMProviderWithCache
         if (rootLayoutNode == null) {
             return null;
         } 
-        else if (element.equals(rootLayoutNode.getRootObject())) {
+        else if (element.equals(getRootElement())) {
             return rootLayoutNode;
         } 
         else if (element instanceof IVMContext){

plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/launch/StandardLaunchRootLayoutNode.java

@@ -17,7 +17,7 @@ import java.util.Map;
 import org.eclipse.dd.dsf.concurrent.RequestMonitor;
 import org.eclipse.dd.dsf.concurrent.DataRequestMonitor;
 import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMProvider;
-import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMRootLayoutNode;
+import org.eclipse.dd.dsf.ui.viewmodel.VMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.VMDelta;
@@ -35,7 +35,7 @@ import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
  * functionality, so the default adapters should be used to retrieve the label.  
  */
 @SuppressWarnings("restriction")
-public class StandardLaunchRootLayoutNode extends AbstractVMRootLayoutNode 
+public class StandardLaunchRootLayoutNode extends VMRootLayoutNode 
     implements IVMRootLayoutNode
 {
     public static class LaunchesEvent {

plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/register/RegisterVMProvider.java

@@ -11,13 +11,13 @@
 package org.eclipse.dd.dsf.debug.ui.viewmodel.register;
 
 import org.eclipse.dd.dsf.debug.service.IFormattedValues;
-import org.eclipse.dd.dsf.debug.ui.viewmodel.DebugViewSelectionRootLayoutNode;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.formatsupport.IFormattedValuePreferenceStore;
 import org.eclipse.dd.dsf.service.DsfSession;
 import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMAdapter;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.dm.AbstractDMVMProviderWithCache;
+import org.eclipse.dd.dsf.ui.viewmodel.dm.DMVMRootLayoutNode;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IColumnPresentation;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
 
@@ -43,7 +43,7 @@ public class RegisterVMProvider extends AbstractDMVMProviderWithCache implements
         /*
          *  Create the top level node to deal with the root selection.
          */
-        IVMRootLayoutNode debugViewSelection = new DebugViewSelectionRootLayoutNode(this);
+        IVMRootLayoutNode debugViewSelection = new DMVMRootLayoutNode(this);
         
         /*
          *  Create the Group nodes next. They represent the first level shown in the view.

plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/variable/VariableVMProvider.java

@@ -9,13 +9,13 @@
 package org.eclipse.dd.dsf.debug.ui.viewmodel.variable;
 
 import org.eclipse.dd.dsf.debug.service.IFormattedValues;
-import org.eclipse.dd.dsf.debug.ui.viewmodel.DebugViewSelectionRootLayoutNode;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.formatsupport.IFormattedValuePreferenceStore;
 import org.eclipse.dd.dsf.service.DsfSession;
 import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMAdapter;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.dm.AbstractDMVMProviderWithCache;
+import org.eclipse.dd.dsf.ui.viewmodel.dm.DMVMRootLayoutNode;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IColumnPresentation;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IColumnPresentationFactory;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
@@ -37,7 +37,7 @@ public class VariableVMProvider extends AbstractDMVMProviderWithCache implements
         /*
          *  Create the top level node to deal with the root selection.
          */
-        IVMRootLayoutNode debugViewSelection = new DebugViewSelectionRootLayoutNode(this);
+        IVMRootLayoutNode debugViewSelection = new DMVMRootLayoutNode(this);
         
         /*
          *  Create the local variables nodes next. They represent the first level shown in the view.

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/AbstractVMAdapter.java

@@ -67,15 +67,8 @@ abstract public class AbstractVMAdapter implements IVMAdapter
         return fExecutor;
     }
     
-    /**
-     * Creates a new View Model Provider for given presentation context.  Returns null
-     * if the presentation context is not supported.
-     */
     @ThreadSafe
-    abstract protected IVMProvider createViewModelProvider(IPresentationContext context);
+    public IVMProvider getVMProvider(IPresentationContext context) {
-
-    @ThreadSafe
-    private IVMProvider getViewModelProvider(IPresentationContext context) {
         synchronized(fViewModelProviders) {
             if (fDisposed) return null;
 
@@ -142,7 +135,7 @@ abstract public class AbstractVMAdapter implements IVMAdapter
     }
     
     private void callProviderWithUpdate(IViewerUpdate[] updates, int startIdx, int endIdx) {
-        final IVMProvider provider = getViewModelProvider(updates[0].getPresentationContext());
+        final IVMProvider provider = getVMProvider(updates[0].getPresentationContext());
         if (provider == null) {
             for (IViewerUpdate update : updates) {
                 update.setStatus(new Status(IStatus.ERROR, DsfUIPlugin.PLUGIN_ID, IDsfService.INTERNAL_ERROR, 
@@ -175,7 +168,7 @@ abstract public class AbstractVMAdapter implements IVMAdapter
     }
         
     public IModelProxy createModelProxy(Object element, IPresentationContext context) {
-        IVMProvider provider = getViewModelProvider(context);
+        IVMProvider provider = getVMProvider(context);
         if (provider != null) {
             return provider.createModelProxy(element, context);
         }
@@ -183,7 +176,7 @@ abstract public class AbstractVMAdapter implements IVMAdapter
     }
     
     public IColumnPresentation createColumnPresentation(IPresentationContext context, Object element) {
-        final IVMProvider provider = getViewModelProvider(context);
+        final IVMProvider provider = getVMProvider(context);
         if (provider != null) {
             return provider.createColumnPresentation(context, element);
         }
@@ -191,12 +184,17 @@ abstract public class AbstractVMAdapter implements IVMAdapter
     }
     
     public String getColumnPresentationId(IPresentationContext context, Object element) {
-        final IVMProvider provider = getViewModelProvider(context);
+        final IVMProvider provider = getVMProvider(context);
         if (provider != null) {
             return provider.getColumnPresentationId(context, element);
         }
         return null;
     }
     
-
+    /**
+     * Creates a new View Model Provider for given presentation context.  Returns null
+     * if the presentation context is not supported.
+     */
+    @ThreadSafe    
+    abstract protected IVMProvider createViewModelProvider(IPresentationContext context);
 }

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/AbstractVMLayoutNode.java

@@ -447,7 +447,7 @@ abstract public class AbstractVMLayoutNode implements IVMLayoutNode {
                 return path.getLastSegment();
             }
             // Calculate the root of the viewer.
-            return getVMProvider().getRootLayoutNode().getRootObject();
+            return getVMProvider().getRootElement();
         }
 
         public Object getElement() {

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/AbstractVMProvider.java

@@ -62,8 +62,21 @@ import org.eclipse.debug.internal.ui.viewers.provisional.IAsynchronousLabelAdapt
 @SuppressWarnings("restriction")
 abstract public class AbstractVMProvider implements IVMProvider
 {
+    /** Reference to the VM adapter that owns this provider */
     private final AbstractVMAdapter fVMAdapter;
+    
+    /** The presentation context that this provider is associated with */
     private final IPresentationContext fPresentationContext;
+    
+    /** 
+     * The current root element of this view model.  This element is obtained
+     * from the argument to {@link #createModelProxy(Object, IPresentationContext)}.
+     */ 
+    private Object fRootElement;
+    
+    /**
+     * 
+     */
     private ModelProxy fModelProxy = new ModelProxy();
     private boolean fDisposed = false;
 
@@ -104,10 +117,16 @@ abstract public class AbstractVMProvider implements IVMProvider
         }
     }
     
+    @ThreadSafe
     protected synchronized ModelProxy getModelProxy() {
         return fModelProxy;
     }
     
+    @ThreadSafe
+    public synchronized Object getRootElement() {
+        return fRootElement;
+    }
+    
     @ThreadSafe
     public IVMRootLayoutNode getRootLayoutNode() {
         return fRootLayoutNodeRef.get();
@@ -385,18 +404,16 @@ abstract public class AbstractVMProvider implements IVMProvider
     public ModelProxy createModelProxy(Object element, IPresentationContext context) {
         /*
          * Model proxy is the object that correlates events from the data model 
-         * into view model deltas that the view can process.  We only need to 
+         * into view model deltas that the view can process.  This method is called 
-         * create a proxy for the root element of the tree.
+         * by the viewer when a new input object is set to the view.  We need to create
+         * a new instance of the ModelProxy object with every call, because the viewer
+         * disposes the old proxy before calling this method.  
          */
-        if (getRootLayoutNode() != null && 
+        synchronized(this) {
-            element.equals(getRootLayoutNode().getRootObject()))
+            fRootElement = element;
-        {
+            fModelProxy = new ModelProxy();
-            synchronized(this) {
-                fModelProxy = new ModelProxy();
-            }
-            return fModelProxy;
         }
-        return null;
+        return fModelProxy;
     }
 
     /**
@@ -456,7 +473,7 @@ abstract public class AbstractVMProvider implements IVMProvider
         if (rootLayoutNode == null) {
             return null;
         } 
-        else if (element.equals(rootLayoutNode.getRootObject())) {
+        else if (element.equals(getRootElement())) {
             return rootLayoutNode;
         } 
         else if (element instanceof IVMContext){

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/IVMAdapter.java

@@ -4,6 +4,7 @@ import org.eclipse.dd.dsf.concurrent.ThreadSafe;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IColumnPresentationFactory;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxyFactory;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
 
 /**
  * The View Model adapter handles the layout of a given data model within a 
@@ -16,4 +17,9 @@ import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxyFactor
 public interface IVMAdapter
     extends IElementContentProvider, IModelProxyFactory, IColumnPresentationFactory 
 {
+    /**
+     * Returns the View Model Provider that is registered for the given presentation
+     * context.  Returns <code>null</code> if there is none.
+     */
+    public IVMProvider getVMProvider(IPresentationContext presentationContext);
 }

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/IVMProvider.java

@@ -22,6 +22,15 @@ public interface IVMProvider
      */
     public IVMRootLayoutNode getRootLayoutNode();
     
+    /**
+     * Returns the root element of the view model.  If the given view model is 
+     * used to populate the entire contents of the view, then this is the input
+     * element for the viewer.  If the view model is used to populate only a 
+     * sub-tree section of the view, then this is the root element of that 
+     * sub-tree.
+     */
+    public Object getRootElement();
+    
     /**
      * Returns the presentation context of the viewer that this provider
      * is configured for. 
@@ -32,4 +41,5 @@ public interface IVMProvider
      * Cleans up the resources associated with this provider.
      */
     public void dispose();
+    
 }

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/IVMRootLayoutNode.java

@@ -21,14 +21,6 @@ import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
 @SuppressWarnings("restriction")
 public interface IVMRootLayoutNode extends IVMLayoutNode{
     
-    /**
-     * Returns the single element of this node.  Root layout node can only have
-     * one element, and this is a convenience method to access this element.
-     * Alternatively getElements() could be used.  
-     * @return
-     */
-    public Object getRootObject();
-    
     /**
      * Version of the {@link IVMLayoutNode#buildDelta(Object, ViewModelDelta, org.eclipse.dd.dsf.concurrent.RequestMonitor)}
      * method, which creates and returns the root node of the delta.  It does 

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/VMRootLayoutNode.java

@@ -21,28 +21,29 @@ import org.eclipse.debug.internal.ui.viewers.model.provisional.ILabelUpdate;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
 
 /**
- * 
+ * Default implementation of a root layout node.  This class may be sub-classed
+ * to implement model-specific event handling.
  */
 @SuppressWarnings("restriction")
-abstract public class AbstractVMRootLayoutNode extends AbstractVMLayoutNode implements IVMRootLayoutNode {
+public class VMRootLayoutNode extends AbstractVMLayoutNode implements IVMRootLayoutNode {
 
-    public AbstractVMRootLayoutNode(AbstractVMProvider provider) {
+    public VMRootLayoutNode(AbstractVMProvider provider) {
         super(provider);
     }
 
     /**
-     * This implementation only fulfils the requirements of the super-interface.
+     * This implementation only fulfills the requirements of the super-interface.
      * There is no use case for a root node implementing this method, but its 
-     * easier to just impelemnt it for sake of uniformity of model.
+     * easier to just implement it for sake of uniformity of model.
      */
     public void updateElements(IChildrenUpdate update) {
         // Ignore startIdx, endIdx, since there's only one element to be had.
-        update.setChild(getRootObject(), 0);
+        update.setChild(getVMProvider().getRootElement(), 0);
         update.done();
     }
     
     /**
-     * This implementation only fulfils the requirements of the super-interface.
+     * This implementation only fulfills the requirements of the super-interface.
      * There is no use case for a root node implementing this method, but its 
      * easier to just impelemnt it for sake of uniformity of model.
      */
@@ -52,9 +53,9 @@ abstract public class AbstractVMRootLayoutNode extends AbstractVMLayoutNode impl
     }
 
     /**
-     * This implementation only fulfils the requirements of the super-interface.
+     * This implementation only fulfills the requirements of the super-interface.
      * There is no use case for a root node implementing this method, but its 
-     * easier to just impelemnt it for sake of uniformity of model.
+     * easier to just implement it for sake of uniformity of model.
      */
     public void updateHasElements(IHasChildrenUpdate[] updates) {
         for (IHasChildrenUpdate update : updates) {
@@ -64,9 +65,9 @@ abstract public class AbstractVMRootLayoutNode extends AbstractVMLayoutNode impl
     }
 
     /**
-     * This implementation only fulfils the requirements of the super-interface.
+     * This implementation only fulfills the requirements of the super-interface.
      * There is no use case for a root node implementing this method, but its 
-     * easier to just impelemnt it for sake of uniformity of model.
+     * easier to just implement it for sake of uniformity of model.
      */
     public void updateLabel(@SuppressWarnings("unused")
     IVMContext vmc, ILabelUpdate update) {
@@ -82,7 +83,7 @@ abstract public class AbstractVMRootLayoutNode extends AbstractVMLayoutNode impl
         assert childNodeDeltas.size() != 0 : "Caller should make sure that there are deltas for given event."; //$NON-NLS-1$
 
         // Always create the rootDelta, no matter what delta flags the child nodes have.
-        final VMDelta rootDelta = new VMDelta(getRootObject(), IModelDelta.NO_CHANGE);
+        final VMDelta rootDelta = new VMDelta(getVMProvider().getRootElement(), IModelDelta.NO_CHANGE);
 
         callChildNodesToBuildDelta(
             childNodeDeltas, rootDelta, event, 
@@ -99,4 +100,8 @@ abstract public class AbstractVMRootLayoutNode extends AbstractVMLayoutNode impl
                 }
             });
     }
+    
+    public Object getRootObject() {
+        return getVMProvider().getRootElement();
+    }
 }

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/dm/AbstractDMVMLayoutNode.java

@@ -534,7 +534,7 @@ abstract public class AbstractDMVMLayoutNode<V extends IDMData> extends Abstract
         }
         // Search the root object of the layout hierarchy.
         if (retVal == null) {
-            Object inputObject = getVMProvider().getRootLayoutNode().getRootObject();
+            Object inputObject = getVMProvider().getRootElement();
             if (inputObject instanceof ITreeSelection) {
                 ITreeSelection inputSelection = (ITreeSelection)inputObject;
                 if (inputSelection.getPaths().length == 1) {

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/dm/AbstractDMVMProviderWithCache.java

@@ -34,7 +34,7 @@ public abstract class AbstractDMVMProviderWithCache extends AbstractDMVMProvider
 
 	public void cacheFlushed(Object context) {
 		if(getPresentationContext().equals(context))
-			getModelProxy().fireModelChanged(new ModelDelta(this.getRootLayoutNode().getRootObject(),IModelDelta.CONTENT));
+			getModelProxy().fireModelChanged(new ModelDelta(getRootElement(),IModelDelta.CONTENT));
 	}
 
 	public AbstractDMVMProviderWithCache(AbstractVMAdapter adapter,  IPresentationContext presentationContext, DsfSession session) {

plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/dm/DMVMRootLayoutNode.java

@@ -8,21 +8,16 @@
  * Contributors:
  *     Wind River Systems - initial API and implementation
  *******************************************************************************/
-package org.eclipse.dd.dsf.debug.ui.viewmodel;
+package org.eclipse.dd.dsf.ui.viewmodel.dm;
 
 import org.eclipse.dd.dsf.datamodel.DMContexts;
 import org.eclipse.dd.dsf.datamodel.IDMContext;
 import org.eclipse.dd.dsf.datamodel.IDMEvent;
-import org.eclipse.dd.dsf.debug.ui.DsfDebugUIPlugin;
 import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMProvider;
-import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMRootLayoutNode;
+import org.eclipse.dd.dsf.ui.viewmodel.VMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMRootLayoutNode;
 import org.eclipse.dd.dsf.ui.viewmodel.dm.AbstractDMVMLayoutNode.DMVMContext;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
-import org.eclipse.debug.ui.DebugUITools;
-import org.eclipse.jface.viewers.ISelection;
-import org.eclipse.jface.viewers.IStructuredSelection;
-import org.eclipse.ui.IWorkbenchWindow;
 
 /**
  * This is is a standard root node which listens to the selection in Debug View.
@@ -36,13 +31,11 @@ import org.eclipse.ui.IWorkbenchWindow;
  * whole selection. 
  */
 @SuppressWarnings("restriction")
-public class DebugViewSelectionRootLayoutNode extends AbstractVMRootLayoutNode 
+public class DMVMRootLayoutNode extends VMRootLayoutNode 
     implements IVMRootLayoutNode
 {
-    private final IWorkbenchWindow fWindow;
+    public DMVMRootLayoutNode(AbstractVMProvider provider) {
-    public DebugViewSelectionRootLayoutNode(AbstractVMProvider provider) {
         super(provider);
-        fWindow = DsfDebugUIPlugin.getDefault().getWorkbench().getActiveWorkbenchWindow();
     }
 
     /**
@@ -91,33 +84,14 @@ public class DebugViewSelectionRootLayoutNode extends AbstractVMRootLayoutNode
         return super.getDeltaFlags(event);
     }
 
-    /**
-     * Returns the full selection as it came from the DebugContextManager.  
-     * @return
-     */
-    public ISelection getSelection() {
-        return DebugUITools.getDebugContextManager().getContextService(fWindow).getActiveContext();
-    }
-    
-    public Object getRootObject() {
-        ISelection selection = getSelection();
-        if (selection instanceof IStructuredSelection) {
-            return ((IStructuredSelection)selection).getFirstElement();
-        }
-        return null;
-    }
-    
     private IDMContext<?> getSelectedDMC() {
-        Object selection = getSelection();
+        Object rootObject = getVMProvider().getRootElement();
-        if (selection instanceof IStructuredSelection) {
+        if (rootObject instanceof DMVMContext) 
-            IStructuredSelection structSelection = (IStructuredSelection)selection; 
+        {
-            if (structSelection.getFirstElement() instanceof DMVMContext) 
+            // Correct cast: (AbstractDMVMLayoutNode<?>.DMVMContext) breaks the javac compiler
-            {
+            @SuppressWarnings("unchecked")
-                // Correct cast: (AbstractDMVMLayoutNode<?>.DMVMContext) breaks the javac compiler
+            DMVMContext vmc = (DMVMContext)rootObject;
-                @SuppressWarnings("unchecked")
+            return vmc.getDMC();
-                DMVMContext vmc = (DMVMContext)structSelection.getFirstElement();
-                return vmc.getDMC();
-            }
         }
         return null;
     }