* <copyright>

* </copyright>

*

* $Id$

*/

* This is an example of a URML model editor.

* <!-- begin-user-doc -->

* <!-- end-user-doc -->

* @generated

*/

  extends MultiPageEditorPart

  implements IEditingDomainProvider, ISelectionProvider, IMenuListener, IViewerProvider {

  /**

   * The filters for file extensions supported by the editor.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public static final List<String> FILE_EXTENSION_FILTERS = prefixExtensions(URMLModelWizard.FILE_EXTENSIONS, "*.");

  /**

   * Returns a new unmodifiable list containing prefixed versions of the extensions in the given list.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  private static List<String> prefixExtensions(List<String> extensions, String prefix) {

    List<String> result = new ArrayList<String>();

    for (String extension : extensions) {

      result.add(prefix + extension);

    }

    return Collections.unmodifiableList(result);

  }

  /**

   * This keeps track of the editing domain that is used to track all changes to the model.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected AdapterFactoryEditingDomain editingDomain;

  /**

   * This is the one adapter factory used for providing views of the model.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected ComposedAdapterFactory adapterFactory;

  /**

   * This is the content outline page.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected IContentOutlinePage contentOutlinePage;

  /**

   * This is a kludge...

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected IStatusLineManager contentOutlineStatusLineManager;

  /**

   * This is the content outline page's viewer.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected TreeViewer contentOutlineViewer;

  /**

   * This is the property sheet page.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected PropertySheetPage propertySheetPage;

  /**

   * This is the viewer that shadows the selection in the content outline.

   * The parent relation must be correctly defined for this to work.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected TreeViewer selectionViewer;

  /**

   * This inverts the roll of parent and child in the content provider and show parents as a tree.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected TreeViewer parentViewer;

  /**

   * This shows how a tree view works.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected TreeViewer treeViewer;

  /**

   * This shows how a list view works.

   * A list viewer doesn't support icons.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected ListViewer listViewer;

  /**

   * This shows how a table view works.

   * A table can be used as a list with icons.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected TableViewer tableViewer;

  /**

   * This shows how a tree view with columns works.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected TreeViewer treeViewerWithColumns;

  /**

   * This keeps track of the active viewer pane, in the book.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected ViewerPane currentViewerPane;

  /**

   * This keeps track of the active content viewer, which may be either one of the viewers in the pages or the content outline viewer.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected Viewer currentViewer;

  /**

   * This listens to which ever viewer is active.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected ISelectionChangedListener selectionChangedListener;

  /**

   * This keeps track of all the {@link org.eclipse.jface.viewers.ISelectionChangedListener}s that are listening to this editor.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected Collection<ISelectionChangedListener> selectionChangedListeners = new ArrayList<ISelectionChangedListener>();

  /**

   * This keeps track of the selection of the editor as a whole.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected ISelection editorSelection = StructuredSelection.EMPTY;

  /**

   * This listens for when the outline becomes active

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected IPartListener partListener =

    new IPartListener() {

      public void partActivated(IWorkbenchPart p) {

        if (p instanceof ContentOutline) {

          if (((ContentOutline)p).getCurrentPage() == contentOutlinePage) {

            getActionBarContributor().setActiveEditor(URMLEditor.this);

            setCurrentViewer(contentOutlineViewer);

          }

        }

        else if (p instanceof PropertySheet) {

          if (((PropertySheet)p).getCurrentPage() == propertySheetPage) {

            getActionBarContributor().setActiveEditor(URMLEditor.this);

            handleActivate();

          }

        }

        else if (p == URMLEditor.this) {

          handleActivate();

        }

      }

      public void partBroughtToTop(IWorkbenchPart p) {

        // Ignore.

      }

      public void partClosed(IWorkbenchPart p) {

        // Ignore.

      }

      public void partDeactivated(IWorkbenchPart p) {

        // Ignore.

      }

      public void partOpened(IWorkbenchPart p) {

        // Ignore.

      }

    };

  /**

   * Resources that have been removed since last activation.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected Collection<Resource> removedResources = new ArrayList<Resource>();

  /**

   * Resources that have been changed since last activation.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected Collection<Resource> changedResources = new ArrayList<Resource>();

  /**

   * Resources that have been saved.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected Collection<Resource> savedResources = new ArrayList<Resource>();

  /**

   * Map to store the diagnostic associated with a resource.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected Map<Resource, Diagnostic> resourceToDiagnosticMap = new LinkedHashMap<Resource, Diagnostic>();

  /**

   * Controls whether the problem indication should be updated.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected boolean updateProblemIndication = true;

  /**

   * Adapter used to update the problem indication when resources are demanded loaded.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected EContentAdapter problemIndicationAdapter =

    new EContentAdapter() {

      @Override

      public void notifyChanged(Notification notification) {

        if (notification.getNotifier() instanceof Resource) {

          switch (notification.getFeatureID(Resource.class)) {

            case Resource.RESOURCE__IS_LOADED:

            case Resource.RESOURCE__ERRORS:

            case Resource.RESOURCE__WARNINGS: {

              Resource resource = (Resource)notification.getNotifier();

              Diagnostic diagnostic = analyzeResourceProblems(resource, null);

              if (diagnostic.getSeverity() != Diagnostic.OK) {

                resourceToDiagnosticMap.put(resource, diagnostic);

              }

              else {

                resourceToDiagnosticMap.remove(resource);

              }

              if (updateProblemIndication) {

                getSite().getShell().getDisplay().asyncExec

                  (new Runnable() {

                     public void run() {

                       updateProblemIndication();

                     }

                   });

              }

              break;

            }

          }

        }

        else {

          super.notifyChanged(notification);

        }

      }

      @Override

      protected void setTarget(Resource target) {

        basicSetTarget(target);

      }

      @Override

      protected void unsetTarget(Resource target) {

        basicUnsetTarget(target);

      }

    };

  /**

   * Handles activation of the editor or it's associated views.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void handleActivate() {

    // Recompute the read only state.

    //

    if (editingDomain.getResourceToReadOnlyMap() != null) {

      editingDomain.getResourceToReadOnlyMap().clear();

      // Refresh any actions that may become enabled or disabled.

      //

      setSelection(getSelection());

    }

    if (!removedResources.isEmpty()) {

      if (handleDirtyConflict()) {

        getSite().getPage().closeEditor(URMLEditor.this, false);

      }

      else {

        removedResources.clear();

        changedResources.clear();

        savedResources.clear();

      }

    }

    else if (!changedResources.isEmpty()) {

      changedResources.removeAll(savedResources);

      handleChangedResources();

      changedResources.clear();

      savedResources.clear();

    }

  }

  /**

   * Handles what to do with changed resources on activation.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void handleChangedResources() {

    if (!changedResources.isEmpty() && (!isDirty() || handleDirtyConflict())) {

      if (isDirty()) {

        changedResources.addAll(editingDomain.getResourceSet().getResources());

      }

      editingDomain.getCommandStack().flush();

      updateProblemIndication = false;

      for (Resource resource : changedResources) {

        if (resource.isLoaded()) {

          resource.unload();

          try {

            resource.load(Collections.EMPTY_MAP);

          }

          catch (IOException exception) {

            if (!resourceToDiagnosticMap.containsKey(resource)) {

              resourceToDiagnosticMap.put(resource, analyzeResourceProblems(resource, exception));

            }

          }

        }

      }

      if (AdapterFactoryEditingDomain.isStale(editorSelection)) {

        setSelection(StructuredSelection.EMPTY);

      }

      updateProblemIndication = true;

      updateProblemIndication();

    }

  }

 

  /**

   * Updates the problems indication with the information described in the specified diagnostic.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void updateProblemIndication() {

    if (updateProblemIndication) {

      BasicDiagnostic diagnostic =

        new BasicDiagnostic

          (Diagnostic.OK,

           "OntoUML.editor",

           0,

           null,

           new Object [] { editingDomain.getResourceSet() });

      for (Diagnostic childDiagnostic : resourceToDiagnosticMap.values()) {

        if (childDiagnostic.getSeverity() != Diagnostic.OK) {

          diagnostic.add(childDiagnostic);

        }

      }

      int lastEditorPage = getPageCount() - 1;

      if (lastEditorPage >= 0 && getEditor(lastEditorPage) instanceof ProblemEditorPart) {

        ((ProblemEditorPart)getEditor(lastEditorPage)).setDiagnostic(diagnostic);

        if (diagnostic.getSeverity() != Diagnostic.OK) {

          setActivePage(lastEditorPage);

        }

      }

      else if (diagnostic.getSeverity() != Diagnostic.OK) {

        ProblemEditorPart problemEditorPart = new ProblemEditorPart();

        problemEditorPart.setDiagnostic(diagnostic);

        try {

          addPage(++lastEditorPage, problemEditorPart, getEditorInput());

          setPageText(lastEditorPage, problemEditorPart.getPartName());

          setActivePage(lastEditorPage);

          showTabs();

        }

        catch (PartInitException exception) {

          OntoUMLEditorPlugin.INSTANCE.log(exception);

        }

      }

    }

  }

  /**

   * Shows a dialog that asks if conflicting changes should be discarded.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected boolean handleDirtyConflict() {

    return

      MessageDialog.openQuestion

        (getSite().getShell(),

         getString("_UI_FileConflict_label"),

         getString("_WARN_FileConflict"));

  }

  /**

   * This creates a model editor.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public URMLEditor() {

    super();

    initializeEditingDomain();

  }

  /**

   * This sets up the editing domain for the model editor.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void initializeEditingDomain() {

    // Create an adapter factory that yields item providers.

    //

    adapterFactory = new ComposedAdapterFactory(ComposedAdapterFactory.Descriptor.Registry.INSTANCE);

    adapterFactory.addAdapterFactory(new ResourceItemProviderAdapterFactory());

    adapterFactory.addAdapterFactory(new OntoUMLItemProviderAdapterFactory());

    adapterFactory.addAdapterFactory(new URMLItemProviderAdapterFactory());

    adapterFactory.addAdapterFactory(new ReflectiveItemProviderAdapterFactory());

    // Create the command stack that will notify this editor as commands are executed.

    //

    BasicCommandStack commandStack = new BasicCommandStack();

    // Add a listener to set the most recent command's affected objects to be the selection of the viewer with focus.

    //

    commandStack.addCommandStackListener

      (new CommandStackListener() {

         public void commandStackChanged(final EventObject event) {

           getContainer().getDisplay().asyncExec

             (new Runnable() {

                public void run() {

                  firePropertyChange(IEditorPart.PROP_DIRTY);

                  // Try to select the affected objects.

                  //

                  Command mostRecentCommand = ((CommandStack)event.getSource()).getMostRecentCommand();

                  if (mostRecentCommand != null) {

                    setSelectionToViewer(mostRecentCommand.getAffectedObjects());

                  }

                  if (propertySheetPage != null && !propertySheetPage.getControl().isDisposed()) {

                    propertySheetPage.refresh();

                  }

                }

              });

         }

       });

    // Create the editing domain with a special command stack.

    //

    editingDomain = new AdapterFactoryEditingDomain(adapterFactory, commandStack, new HashMap<Resource, Boolean>());

  }

  /**

   * This is here for the listener to be able to call it.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

      @Override

  protected void firePropertyChange(int action) {

    super.firePropertyChange(action);

  }

  /**

   * This sets the selection into whichever viewer is active.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public void setSelectionToViewer(Collection<?> collection) {

    final Collection<?> theSelection = collection;

    // Make sure it's okay.

    //

    if (theSelection != null && !theSelection.isEmpty()) {

      // I don't know if this should be run this deferred

      // because we might have to give the editor a chance to process the viewer update events

      // and hence to update the views first.

      //

      //

      Runnable runnable =

        new Runnable() {

          public void run() {

            // Try to select the items in the current content viewer of the editor.

            //

            if (currentViewer != null) {

              currentViewer.setSelection(new StructuredSelection(theSelection.toArray()), true);

            }

          }

        };

      runnable.run();

    }

  }

  /**

   * This returns the editing domain as required by the {@link IEditingDomainProvider} interface.

   * This is important for implementing the static methods of {@link AdapterFactoryEditingDomain}

   * and for supporting {@link org.eclipse.emf.edit.ui.action.CommandAction}.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public EditingDomain getEditingDomain() {

    return editingDomain;

  }

  /**

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public class ReverseAdapterFactoryContentProvider extends AdapterFactoryContentProvider {

    /**

     * <!-- begin-user-doc -->

     * <!-- end-user-doc -->

     * @generated

     */

    public ReverseAdapterFactoryContentProvider(AdapterFactory adapterFactory) {

      super(adapterFactory);

    }

    /**

     * <!-- begin-user-doc -->

     * <!-- end-user-doc -->

     * @generated

     */

    @Override

    public Object [] getElements(Object object) {

      Object parent = super.getParent(object);

      return (parent == null ? Collections.EMPTY_SET : Collections.singleton(parent)).toArray();

    }

    /**

     * <!-- begin-user-doc -->

     * <!-- end-user-doc -->

     * @generated

     */

    @Override

    public Object [] getChildren(Object object) {

      Object parent = super.getParent(object);

      return (parent == null ? Collections.EMPTY_SET : Collections.singleton(parent)).toArray();

    }

    /**

     * <!-- begin-user-doc -->

     * <!-- end-user-doc -->

     * @generated

     */

    @Override

    public boolean hasChildren(Object object) {

      Object parent = super.getParent(object);

      return parent != null;

    }

    /**

     * <!-- begin-user-doc -->

     * <!-- end-user-doc -->

     * @generated

     */

    @Override

    public Object getParent(Object object) {

      return null;

    }

  }

  /**

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public void setCurrentViewerPane(ViewerPane viewerPane) {

    if (currentViewerPane != viewerPane) {

      if (currentViewerPane != null) {

        currentViewerPane.showFocus(false);

      }

      currentViewerPane = viewerPane;

    }

    setCurrentViewer(currentViewerPane.getViewer());

  }

  /**

   * This makes sure that one content viewer, either for the current page or the outline view, if it has focus,

   * is the current one.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public void setCurrentViewer(Viewer viewer) {

    // If it is changing...

    //

    if (currentViewer != viewer) {

      if (selectionChangedListener == null) {

        // Create the listener on demand.

        //

        selectionChangedListener =

          new ISelectionChangedListener() {

            // This just notifies those things that are affected by the section.

            //

            public void selectionChanged(SelectionChangedEvent selectionChangedEvent) {

              setSelection(selectionChangedEvent.getSelection());

            }

          };

      }

      // Stop listening to the old one.

      //

      if (currentViewer != null) {

        currentViewer.removeSelectionChangedListener(selectionChangedListener);

      }

      // Start listening to the new one.

      //

      if (viewer != null) {

        viewer.addSelectionChangedListener(selectionChangedListener);

      }

      // Remember it.

      //

      currentViewer = viewer;

      // Set the editors selection based on the current viewer's selection.

      //

      setSelection(currentViewer == null ? StructuredSelection.EMPTY : currentViewer.getSelection());

    }

  }

  /**

   * This returns the viewer as required by the {@link IViewerProvider} interface.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public Viewer getViewer() {

    return currentViewer;

  }

  /**

   * This creates a context menu for the viewer and adds a listener as well registering the menu for extension.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void createContextMenuFor(StructuredViewer viewer) {

    MenuManager contextMenu = new MenuManager("#PopUp");

    contextMenu.add(new Separator("additions"));

    contextMenu.setRemoveAllWhenShown(true);

    contextMenu.addMenuListener(this);

    Menu menu= contextMenu.createContextMenu(viewer.getControl());

    viewer.getControl().setMenu(menu);

    getSite().registerContextMenu(contextMenu, new UnwrappingSelectionProvider(viewer));

    int dndOperations = DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK;

    Transfer[] transfers = new Transfer[] { LocalTransfer.getInstance() };

    viewer.addDragSupport(dndOperations, transfers, new ViewerDragAdapter(viewer));

    viewer.addDropSupport(dndOperations, transfers, new EditingDomainViewerDropAdapter(editingDomain, viewer));

  }

  /**

   * This is the method called to load a resource into the editing domain's resource set based on the editor's input.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public void createModel() {

    URI resourceURI = EditUIUtil.getURI(getEditorInput());

    Exception exception = null;

    Resource resource = null;

    try {

      // Load the resource through the editing domain.

      //

      resource = editingDomain.getResourceSet().getResource(resourceURI, true);

    }

    catch (Exception e) {

      exception = e;

      resource = editingDomain.getResourceSet().getResource(resourceURI, false);

    }

    Diagnostic diagnostic = analyzeResourceProblems(resource, exception);

    if (diagnostic.getSeverity() != Diagnostic.OK) {

      resourceToDiagnosticMap.put(resource,  analyzeResourceProblems(resource, exception));

    }

    editingDomain.getResourceSet().eAdapters().add(problemIndicationAdapter);

  }

  /**

   * Returns a diagnostic describing the errors and warnings listed in the resource

   * and the specified exception (if any).

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public Diagnostic analyzeResourceProblems(Resource resource, Exception exception) {

    if (!resource.getErrors().isEmpty() || !resource.getWarnings().isEmpty()) {

      BasicDiagnostic basicDiagnostic =

        new BasicDiagnostic

          (Diagnostic.ERROR,

           "OntoUML.editor",

           0,

           getString("_UI_CreateModelError_message", resource.getURI()),

           new Object [] { exception == null ? (Object)resource : exception });

      basicDiagnostic.merge(EcoreUtil.computeDiagnostic(resource, true));

      return basicDiagnostic;

    }

    else if (exception != null) {

      return

        new BasicDiagnostic

          (Diagnostic.ERROR,

           "OntoUML.editor",

           0,

           getString("_UI_CreateModelError_message", resource.getURI()),

           new Object[] { exception });

    }

    else {

      return Diagnostic.OK_INSTANCE;

    }

  }

  /**

   * This is the method used by the framework to install your own controls.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  @Override

  public void createPages() {

    // Creates the model from the editor input

    //

    createModel();

    // Only creates the other pages if there is something that can be edited

    //

    if (!getEditingDomain().getResourceSet().getResources().isEmpty()) {

      // Create a page for the selection tree view.

      //

      {

        ViewerPane viewerPane =

          new ViewerPane(getSite().getPage(), URMLEditor.this) {

            @Override

            public Viewer createViewer(Composite composite) {

              Tree tree = new Tree(composite, SWT.MULTI);

              TreeViewer newTreeViewer = new TreeViewer(tree);

              return newTreeViewer;

            }

            @Override

            public void requestActivation() {

              super.requestActivation();

              setCurrentViewerPane(this);

            }

          };

        viewerPane.createControl(getContainer());

        selectionViewer = (TreeViewer)viewerPane.getViewer();

        selectionViewer.setContentProvider(new AdapterFactoryContentProvider(adapterFactory));

        selectionViewer.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

        selectionViewer.setInput(editingDomain.getResourceSet());

        selectionViewer.setSelection(new StructuredSelection(editingDomain.getResourceSet().getResources().get(0)), true);

        viewerPane.setTitle(editingDomain.getResourceSet());

        new AdapterFactoryTreeEditor(selectionViewer.getTree(), adapterFactory);

        createContextMenuFor(selectionViewer);

        int pageIndex = addPage(viewerPane.getControl());

        setPageText(pageIndex, getString("_UI_SelectionPage_label"));

      }

      // Create a page for the parent tree view.

      //

      {

        ViewerPane viewerPane =

          new ViewerPane(getSite().getPage(), URMLEditor.this) {

            @Override

            public Viewer createViewer(Composite composite) {

              Tree tree = new Tree(composite, SWT.MULTI);

              TreeViewer newTreeViewer = new TreeViewer(tree);

              return newTreeViewer;

            }

            @Override

            public void requestActivation() {

              super.requestActivation();

              setCurrentViewerPane(this);

            }

          };

        viewerPane.createControl(getContainer());

        parentViewer = (TreeViewer)viewerPane.getViewer();

        parentViewer.setAutoExpandLevel(30);

        parentViewer.setContentProvider(new ReverseAdapterFactoryContentProvider(adapterFactory));

        parentViewer.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

        createContextMenuFor(parentViewer);

        int pageIndex = addPage(viewerPane.getControl());

        setPageText(pageIndex, getString("_UI_ParentPage_label"));

      }

      // This is the page for the list viewer

      //

      {

        ViewerPane viewerPane =

          new ViewerPane(getSite().getPage(), URMLEditor.this) {

            @Override

            public Viewer createViewer(Composite composite) {

              return new ListViewer(composite);

            }

            @Override

            public void requestActivation() {

              super.requestActivation();

              setCurrentViewerPane(this);

            }

          };

        viewerPane.createControl(getContainer());

        listViewer = (ListViewer)viewerPane.getViewer();

        listViewer.setContentProvider(new AdapterFactoryContentProvider(adapterFactory));

        listViewer.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

        createContextMenuFor(listViewer);

        int pageIndex = addPage(viewerPane.getControl());

        setPageText(pageIndex, getString("_UI_ListPage_label"));

      }

      // This is the page for the tree viewer

      //

      {

        ViewerPane viewerPane =

          new ViewerPane(getSite().getPage(), URMLEditor.this) {

            @Override

            public Viewer createViewer(Composite composite) {

              return new TreeViewer(composite);

            }

            @Override

            public void requestActivation() {

              super.requestActivation();

              setCurrentViewerPane(this);

            }

          };

        viewerPane.createControl(getContainer());

        treeViewer = (TreeViewer)viewerPane.getViewer();

        treeViewer.setContentProvider(new AdapterFactoryContentProvider(adapterFactory));

        treeViewer.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

        new AdapterFactoryTreeEditor(treeViewer.getTree(), adapterFactory);

        createContextMenuFor(treeViewer);

        int pageIndex = addPage(viewerPane.getControl());

        setPageText(pageIndex, getString("_UI_TreePage_label"));

      }

      // This is the page for the table viewer.

      //

      {

        ViewerPane viewerPane =

          new ViewerPane(getSite().getPage(), URMLEditor.this) {

            @Override

            public Viewer createViewer(Composite composite) {

              return new TableViewer(composite);

            }

            @Override

            public void requestActivation() {

              super.requestActivation();

              setCurrentViewerPane(this);

            }

          };

        viewerPane.createControl(getContainer());

        tableViewer = (TableViewer)viewerPane.getViewer();

        Table table = tableViewer.getTable();

        TableLayout layout = new TableLayout();

        table.setLayout(layout);

        table.setHeaderVisible(true);

        table.setLinesVisible(true);

        TableColumn objectColumn = new TableColumn(table, SWT.NONE);

        layout.addColumnData(new ColumnWeightData(3, 100, true));

        objectColumn.setText(getString("_UI_ObjectColumn_label"));

        objectColumn.setResizable(true);

        TableColumn selfColumn = new TableColumn(table, SWT.NONE);

        layout.addColumnData(new ColumnWeightData(2, 100, true));

        selfColumn.setText(getString("_UI_SelfColumn_label"));

        selfColumn.setResizable(true);

        tableViewer.setColumnProperties(new String [] {"a", "b"});

        tableViewer.setContentProvider(new AdapterFactoryContentProvider(adapterFactory));

        tableViewer.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

        createContextMenuFor(tableViewer);

        int pageIndex = addPage(viewerPane.getControl());

        setPageText(pageIndex, getString("_UI_TablePage_label"));

      }

      // This is the page for the table tree viewer.

      //

      {

        ViewerPane viewerPane =

          new ViewerPane(getSite().getPage(), URMLEditor.this) {

            @Override

            public Viewer createViewer(Composite composite) {

              return new TreeViewer(composite);

            }

            @Override

            public void requestActivation() {

              super.requestActivation();

              setCurrentViewerPane(this);

            }

          };

        viewerPane.createControl(getContainer());

        treeViewerWithColumns = (TreeViewer)viewerPane.getViewer();

        Tree tree = treeViewerWithColumns.getTree();

        tree.setLayoutData(new FillLayout());

        tree.setHeaderVisible(true);

        tree.setLinesVisible(true);

        TreeColumn objectColumn = new TreeColumn(tree, SWT.NONE);

        objectColumn.setText(getString("_UI_ObjectColumn_label"));

        objectColumn.setResizable(true);

        objectColumn.setWidth(250);

        TreeColumn selfColumn = new TreeColumn(tree, SWT.NONE);

        selfColumn.setText(getString("_UI_SelfColumn_label"));

        selfColumn.setResizable(true);

        selfColumn.setWidth(200);

        treeViewerWithColumns.setColumnProperties(new String [] {"a", "b"});

        treeViewerWithColumns.setContentProvider(new AdapterFactoryContentProvider(adapterFactory));

        treeViewerWithColumns.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

        createContextMenuFor(treeViewerWithColumns);

        int pageIndex = addPage(viewerPane.getControl());

        setPageText(pageIndex, getString("_UI_TreeWithColumnsPage_label"));

      }

      getSite().getShell().getDisplay().asyncExec

        (new Runnable() {

           public void run() {

             setActivePage(0);

           }

         });

    }

    // Ensures that this editor will only display the page's tab

    // area if there are more than one page

    //

    getContainer().addControlListener

      (new ControlAdapter() {

        boolean guard = false;

        @Override

        public void controlResized(ControlEvent event) {

          if (!guard) {

            guard = true;

            hideTabs();

            guard = false;

          }

        }

       });

    getSite().getShell().getDisplay().asyncExec

      (new Runnable() {

         public void run() {

           updateProblemIndication();

         }

       });

  }

  /**

   * If there is just one page in the multi-page editor part,

   * this hides the single tab at the bottom.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void hideTabs() {

    if (getPageCount() <= 1) {

      setPageText(0, "");

      if (getContainer() instanceof CTabFolder) {

        ((CTabFolder)getContainer()).setTabHeight(1);

        Point point = getContainer().getSize();

        getContainer().setSize(point.x, point.y + 6);

      }

    }

  }

  /**

   * If there is more than one page in the multi-page editor part,

   * this shows the tabs at the bottom.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  protected void showTabs() {

    if (getPageCount() > 1) {

      setPageText(0, getString("_UI_SelectionPage_label"));

      if (getContainer() instanceof CTabFolder) {

        ((CTabFolder)getContainer()).setTabHeight(SWT.DEFAULT);

        Point point = getContainer().getSize();

        getContainer().setSize(point.x, point.y - 6);

      }

    }

  }

  /**

   * This is used to track the active viewer.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  @Override

  protected void pageChange(int pageIndex) {

    super.pageChange(pageIndex);

    if (contentOutlinePage != null) {

      handleContentOutlineSelection(contentOutlinePage.getSelection());

    }

  }

  /**

   * This is how the framework determines which interfaces we implement.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  @SuppressWarnings("unchecked")

  @Override

  public Object getAdapter(Class key) {

    if (key.equals(IContentOutlinePage.class)) {

      return showOutlineView() ? getContentOutlinePage() : null;

    }

    else if (key.equals(IPropertySheetPage.class)) {

      return getPropertySheetPage();

    }

    else {

      return super.getAdapter(key);

    }

  }

  /**

   * This accesses a cached version of the content outliner.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public IContentOutlinePage getContentOutlinePage() {

    if (contentOutlinePage == null) {

      // The content outline is just a tree.

      //

        @Override

        public void createControl(Composite parent) {

          super.createControl(parent);

          contentOutlineViewer = getTreeViewer();

          contentOutlineViewer.addSelectionChangedListener(this);

          // Set up the tree viewer.

          //

          contentOutlineViewer.setContentProvider(new AdapterFactoryContentProvider(adapterFactory));

          contentOutlineViewer.setLabelProvider(new AdapterFactoryLabelProvider(adapterFactory));

          contentOutlineViewer.setInput(editingDomain.getResourceSet());

          // Make sure our popups work.

          //

          createContextMenuFor(contentOutlineViewer);

          if (!editingDomain.getResourceSet().getResources().isEmpty()) {

            // Select the root object in the view.

            //

            contentOutlineViewer.setSelection(new StructuredSelection(editingDomain.getResourceSet().getResources().get(0)), true);

          }

        }

        @Override

        public void makeContributions(IMenuManager menuManager, IToolBarManager toolBarManager, IStatusLineManager statusLineManager) {

          super.makeContributions(menuManager, toolBarManager, statusLineManager);

          contentOutlineStatusLineManager = statusLineManager;

        }

        @Override

        public void setActionBars(IActionBars actionBars) {

          super.setActionBars(actionBars);

          getActionBarContributor().shareGlobalActions(this, actionBars);

        }

      }

      contentOutlinePage = new MyContentOutlinePage();

      // Listen to selection so that we can handle it is a special way.

      //

      contentOutlinePage.addSelectionChangedListener

        (new ISelectionChangedListener() {

           // This ensures that we handle selections correctly.

           //

           public void selectionChanged(SelectionChangedEvent event) {

             handleContentOutlineSelection(event.getSelection());

           }

         });

    }

    return contentOutlinePage;

  }

  /**

   * This accesses a cached version of the property sheet.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public IPropertySheetPage getPropertySheetPage() {

    if (propertySheetPage == null) {

      propertySheetPage =

        new ExtendedPropertySheetPage(editingDomain) {

          @Override

          public void setSelectionToViewer(List<?> selection) {

            URMLEditor.this.setSelectionToViewer(selection);

            URMLEditor.this.setFocus();

          }

          @Override

          public void setActionBars(IActionBars actionBars) {

            super.setActionBars(actionBars);

            getActionBarContributor().shareGlobalActions(this, actionBars);

          }

        };

      propertySheetPage.setPropertySourceProvider(new AdapterFactoryContentProvider(adapterFactory));

    }

    return propertySheetPage;

  }

  /**

   * This deals with how we want selection in the outliner to affect the other views.

   * <!-- begin-user-doc -->

   * <!-- end-user-doc -->

   * @generated

   */

  public void handleContentOutlineSelection(ISelection selection) {

    if (currentViewerPane != null && !selection.isEmpty() && selection instanceof IStructuredSelection) {

      Iterator<?> selectedElements = ((IStructuredSelection)selection).iterator();

      if (selectedElements.hasNext()) {

        // Get the first selected element.

        //

        Object selectedElement = selectedElements.next();

        // If it's the selection viewer, then we want it to select the same selection as this selection.

        //

        if (currentViewerPane.getViewer() == selectionViewer) {

          ArrayList<Object> selectionList = new ArrayList<Object>();