plugins/org.eclipse.uml2.uml.editor/src/org/eclipse/uml2/uml/editor/presentation/UMLEditor.java

/*
 * Copyright (c) 2005 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   IBM - initial API and implementation
 *
 * $Id: UMLEditor.java,v 1.2 2005/12/07 14:21:24 khussey Exp $
 */
package org.eclipse.uml2.uml.editor.presentation;

import org.eclipse.emf.common.command.BasicCommandStack;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CommandStack;
import org.eclipse.emf.common.command.CommandStackListener;

import org.eclipse.emf.common.notify.AdapterFactory;

import org.eclipse.emf.common.ui.ViewerPane;

import org.eclipse.emf.common.ui.viewer.IViewerProvider;

import org.eclipse.emf.common.util.URI;

import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.domain.IEditingDomainProvider;

import org.eclipse.emf.edit.provider.AdapterFactoryItemDelegator;
import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;

import org.eclipse.emf.edit.provider.resource.ResourceItemProviderAdapterFactory;

import org.eclipse.emf.edit.ui.action.EditingDomainActionBarContributor;

import org.eclipse.emf.edit.ui.celleditor.AdapterFactoryTreeEditor;

import org.eclipse.emf.edit.ui.dnd.EditingDomainViewerDropAdapter;
import org.eclipse.emf.edit.ui.dnd.LocalTransfer;
import org.eclipse.emf.edit.ui.dnd.ViewerDragAdapter;

import org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;

import org.eclipse.emf.edit.ui.view.ExtendedPropertySheetPage;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EValidator;

import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;

import java.io.IOException;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EventObject;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.dialogs.ProgressMonitorDialog;

import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ListViewer;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;

import org.eclipse.swt.SWT;

import org.eclipse.swt.custom.CTabFolder;

import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.Transfer;

import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;

import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeColumn;

import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IWorkbenchPart;

import org.eclipse.ui.dialogs.SaveAsDialog;

import org.eclipse.ui.ide.IGotoMarker;

import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.part.MultiPageEditorPart;

import org.eclipse.ui.views.contentoutline.ContentOutline;
import org.eclipse.ui.views.contentoutline.ContentOutlinePage;
import org.eclipse.ui.views.contentoutline.IContentOutlinePage;

import org.eclipse.ui.views.properties.IPropertySheetPage;
import org.eclipse.ui.views.properties.PropertySheet;
import org.eclipse.ui.views.properties.PropertySheetPage;

import org.eclipse.uml2.uml.edit.providers.UMLItemProviderAdapterFactory;

import java.util.HashMap;

import org.eclipse.core.runtime.NullProgressMonitor;

import org.eclipse.ui.actions.WorkspaceModifyOperation;

import org.eclipse.uml2.uml.editor.UMLEditorPlugin;

/**
 * This is an example of a UML model editor.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 * @generated
 */
public class UMLEditor
		extends MultiPageEditorPart
		implements IEditingDomainProvider, ISelectionProvider, IMenuListener,
		IViewerProvider, IGotoMarker {

	/**
	 * 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 selectionChangedListeners = new ArrayList();

	/**
	 * 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(UMLEditor.this);

					setCurrentViewer(contentOutlineViewer);
				}
			} else if (p instanceof PropertySheet) {
				if (((PropertySheet) p).getCurrentPage() == propertySheetPage) {
					getActionBarContributor().setActiveEditor(UMLEditor.this);
					handleActivate();
				}
			} else if (p == UMLEditor.this) {
				handleActivate();
			}
		}

		public void partBroughtToTop(IWorkbenchPart p) {
		}

		public void partClosed(IWorkbenchPart p) {
		}

		public void partDeactivated(IWorkbenchPart p) {
		}

		public void partOpened(IWorkbenchPart p) {
		}
	};

	/**
	 * Resources that have been removed since last activation.
	 * @generated
	 */
	Collection removedResources = new ArrayList();

	/**
	 * Resources that have been changed since last activation.
	 * @generated
	 */
	Collection changedResources = new ArrayList();

	/**
	 * Resources that have been saved.
	 * @generated
	 */
	Collection savedResources = new ArrayList();

	/**
	 * This listens for workspace changes.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected IResourceChangeListener resourceChangeListener = new IResourceChangeListener() {

		public void resourceChanged(IResourceChangeEvent event) {
			// Only listening to these.
			// if (event.getType() == IResourceDelta.POST_CHANGE)
			{
				IResourceDelta delta = event.getDelta();
				try {
					class ResourceDeltaVisitor
							implements IResourceDeltaVisitor {

						protected ResourceSet resourceSet = editingDomain
							.getResourceSet();

						protected Collection changedResources = new ArrayList();

						protected Collection removedResources = new ArrayList();

						public boolean visit(IResourceDelta delta) {
							if (delta.getFlags() != IResourceDelta.MARKERS
								&& delta.getResource().getType() == IResource.FILE) {
								if ((delta.getKind() & (IResourceDelta.CHANGED | IResourceDelta.REMOVED)) != 0) {
									Resource resource = resourceSet
										.getResource(URI.createURI(delta
											.getFullPath().toString()), false);
									if (resource != null) {
										if ((delta.getKind() & IResourceDelta.REMOVED) != 0) {
											removedResources.add(resource);
										} else {
											changedResources.add(resource);
										}
									}
								}
							}

							return true;
						}

						public Collection getChangedResources() {
							return changedResources;
						}

						public Collection getRemovedResources() {
							return removedResources;
						}
					}

					ResourceDeltaVisitor visitor = new ResourceDeltaVisitor();
					delta.accept(visitor);

					if (!visitor.getRemovedResources().isEmpty()) {
						removedResources.addAll(visitor.getRemovedResources());
						if (!isDirty()) {
							getSite().getShell().getDisplay().asyncExec(
								new Runnable() {

									public void run() {
										getSite().getPage().closeEditor(
											UMLEditor.this, false);
										UMLEditor.this.dispose();
									}
								});
						}
					}

					if (!visitor.getChangedResources().isEmpty()) {
						changedResources.addAll(visitor.getChangedResources());
					}
				} catch (CoreException exception) {
					UMLEditorPlugin.INSTANCE.log(exception);
				}
			}
		}
	};

	/**
	 * Handles activation of the editor or it's associated views.
	 * @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(UMLEditor.this, false);
				UMLEditor.this.dispose();
			} 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.
	 * @generated
	 */
	protected void handleChangedResources() {
		if (!changedResources.isEmpty()
			&& (!isDirty() || handleDirtyConflict())) {
			editingDomain.getCommandStack().flush();

			for (Iterator i = changedResources.iterator(); i.hasNext();) {
				Resource resource = (Resource) i.next();
				if (resource.isLoaded()) {
					resource.unload();
					try {
						resource.load(Collections.EMPTY_MAP);
					} catch (IOException exception) {
						UMLEditorPlugin.INSTANCE.log(exception);
					}
				}
			}
		}
	}

	/**
	 * Shows a dialog that asks if conflicting changes should be discarded.
	 * @generated
	 */
	protected boolean handleDirtyConflict() {
		return MessageDialog.openQuestion(getSite().getShell(),
			getString("_UI_FileConflict_label"), //$NON-NLS-1$
			getString("_WARN_FileConflict")); //$NON-NLS-1$
	}

	/**
	 * This creates a model editor.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public UMLEditor() {
		super();

		// Create an adapter factory that yields item providers.
		//
		List factories = new ArrayList();
		factories.add(new ResourceItemProviderAdapterFactory());
		factories.add(new UMLItemProviderAdapterFactory());
		factories.add(new ReflectiveItemProviderAdapterFactory());

		adapterFactory = new ComposedAdapterFactory(factories);

		// 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.refresh();
						}
					}
				});
			}
		});

		// Create the editing domain with a special command stack.
		//
		editingDomain = new AdapterFactoryEditingDomain(adapterFactory,
			commandStack, new HashMap());
	}

	/**
	 * This is here for the listener to be able to call it.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	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 {

		public ReverseAdapterFactoryContentProvider(
				AdapterFactory adapterFactory) {
			super(adapterFactory);
		}

		public Object[] getElements(Object object) {
			Object parent = super.getParent(object);
			return (parent == null
				? Collections.EMPTY_SET
				: Collections.singleton(parent)).toArray();
		}

		public Object[] getChildren(Object object) {
			Object parent = super.getParent(object);
			return (parent == null
				? Collections.EMPTY_SET
				: Collections.singleton(parent)).toArray();
		}

		public boolean hasChildren(Object object) {
			Object parent = super.getParent(object);
			return parent != null;
		}

		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"); //$NON-NLS-1$
		contextMenu.add(new Separator("additions")); //$NON-NLS-1$
		contextMenu.setRemoveAllWhenShown(true);
		contextMenu.addMenuListener(this);
		Menu menu = contextMenu.createContextMenu(viewer.getControl());
		viewer.getControl().setMenu(menu);
		getSite().registerContextMenu(contextMenu, 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() {
		// I assume that the input is a file object.
		//
		IFileEditorInput modelFile = (IFileEditorInput) getEditorInput();

		try {
			// Load the resource through the editing domain.
			//
			editingDomain.loadResource(URI.createPlatformResourceURI(
				modelFile.getFile().getFullPath().toString()).toString());
		} catch (Exception exception) {
			UMLEditorPlugin.INSTANCE.log(exception);
		}
	}

	/**
	 * This is the method used by the framework to install your own controls.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void createPages() {
		// Creates the model from the editor input
		//
		createModel();

		// Create a page for the selection tree view.
		//
		{
			ViewerPane viewerPane = new ViewerPane(getSite().getPage(),
				UMLEditor.this) {

				public Viewer createViewer(Composite composite) {
					Tree tree = new Tree(composite, SWT.MULTI);
					TreeViewer newTreeViewer = new TreeViewer(tree);
					return newTreeViewer;
				}

				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());
			viewerPane.setTitle(editingDomain.getResourceSet());

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

			createContextMenuFor(selectionViewer);
			int pageIndex = addPage(viewerPane.getControl());
			setPageText(pageIndex, getString("_UI_SelectionPage_label")); //$NON-NLS-1$
		}

		// Create a page for the parent tree view.
		//
		{
			ViewerPane viewerPane = new ViewerPane(getSite().getPage(),
				UMLEditor.this) {

				public Viewer createViewer(Composite composite) {
					Tree tree = new Tree(composite, SWT.MULTI);
					TreeViewer newTreeViewer = new TreeViewer(tree);
					return newTreeViewer;
				}

				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")); //$NON-NLS-1$
		}

		// This is the page for the list viewer
		//
		{
			ViewerPane viewerPane = new ViewerPane(getSite().getPage(),
				UMLEditor.this) {

				public Viewer createViewer(Composite composite) {
					return new ListViewer(composite);
				}

				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")); //$NON-NLS-1$
		}

		// This is the page for the tree viewer
		//
		{
			ViewerPane viewerPane = new ViewerPane(getSite().getPage(),
				UMLEditor.this) {

				public Viewer createViewer(Composite composite) {
					return new TreeViewer(composite);
				}

				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")); //$NON-NLS-1$
		}

		// This is the page for the table viewer.
		//
		{
			ViewerPane viewerPane = new ViewerPane(getSite().getPage(),
				UMLEditor.this) {

				public Viewer createViewer(Composite composite) {
					return new TableViewer(composite);
				}

				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")); //$NON-NLS-1$
			objectColumn.setResizable(true);

			TableColumn selfColumn = new TableColumn(table, SWT.NONE);
			layout.addColumnData(new ColumnWeightData(2, 100, true));
			selfColumn.setText(getString("_UI_SelfColumn_label")); //$NON-NLS-1$
			selfColumn.setResizable(true);

			tableViewer.setColumnProperties(new String[]{"a", "b"}); //$NON-NLS-1$ //$NON-NLS-2$
			tableViewer.setContentProvider(new AdapterFactoryContentProvider(
				adapterFactory));
			tableViewer.setLabelProvider(new AdapterFactoryLabelProvider(
				adapterFactory));

			createContextMenuFor(tableViewer);
			int pageIndex = addPage(viewerPane.getControl());
			setPageText(pageIndex, getString("_UI_TablePage_label")); //$NON-NLS-1$
		}

		// This is the page for the table tree viewer.
		//
		{
			ViewerPane viewerPane = new ViewerPane(getSite().getPage(),
				UMLEditor.this) {

				public Viewer createViewer(Composite composite) {
					return new TreeViewer(composite);
				}

				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")); //$NON-NLS-1$
			objectColumn.setResizable(true);
			objectColumn.setWidth(250);

			TreeColumn selfColumn = new TreeColumn(tree, SWT.NONE);
			selfColumn.setText(getString("_UI_SelfColumn_label")); //$NON-NLS-1$
			selfColumn.setResizable(true);
			selfColumn.setWidth(200);

			treeViewerWithColumns.setColumnProperties(new String[]{"a", "b"}); //$NON-NLS-1$ //$NON-NLS-2$
			treeViewerWithColumns
				.setContentProvider(new AdapterFactoryContentProvider(
					adapterFactory));
			treeViewerWithColumns
				.setLabelProvider(new AdapterFactoryLabelProvider(
					adapterFactory));

			createContextMenuFor(treeViewerWithColumns);
			int pageIndex = addPage(viewerPane.getControl());
			setPageText(pageIndex, getString("_UI_TreeWithColumnsPage_label")); //$NON-NLS-1$
		}

		setActivePage(0);

		getContainer().addControlListener(new ControlAdapter() {

			boolean guard = false;

			public void controlResized(ControlEvent event) {
				if (!guard) {
					guard = true;
					hideTabs();
					guard = false;
				}
			}
		});
	}

	/**
	 * 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, ""); //$NON-NLS-1$
			if (getContainer() instanceof CTabFolder) {
				((CTabFolder) getContainer()).setTabHeight(1);
				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
	 */
	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
	 */
	public Object getAdapter(Class key) {
		if (key.equals(IContentOutlinePage.class)) {
			return getContentOutlinePage();
		} else if (key.equals(IPropertySheetPage.class)) {
			return getPropertySheetPage();
		} else if (key.equals(IGotoMarker.class)) {
			return this;
		} 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.
			//
			class MyContentOutlinePage
					extends ContentOutlinePage {

				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.
						//
						ArrayList selection = new ArrayList();
						selection.add(editingDomain.getResourceSet()
							.getResources().get(0));
						contentOutlineViewer.setSelection(
							new StructuredSelection(selection), true);
					}
				}

				public void makeContributions(IMenuManager menuManager,
						IToolBarManager toolBarManager,
						IStatusLineManager statusLineManager) {
					super.makeContributions(menuManager, toolBarManager,
						statusLineManager);
					contentOutlineStatusLineManager = statusLineManager;
				}

				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) {

				public void setSelectionToViewer(List selection) {
					UMLEditor.this.setSelectionToViewer(selection);
					UMLEditor.this.setFocus();
				}

				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 selectionList = new ArrayList();
					selectionList.add(selectedElement);
					while (selectedElements.hasNext()) {
						selectionList.add(selectedElements.next());
					}

					// Set the selection to the widget.
					//
					selectionViewer.setSelection(new StructuredSelection(
						selectionList));
				} else {
					// Set the input to the widget.
					//
					if (currentViewerPane.getViewer().getInput() != selectedElement) {
						currentViewerPane.getViewer().setInput(selectedElement);
						currentViewerPane.setTitle(selectedElement);
					}
				}
			}
		}
	}

	/**
	 * This is for implementing {@link IEditorPart} and simply tests the command stack.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public boolean isDirty() {
		return ((BasicCommandStack) editingDomain.getCommandStack())
			.isSaveNeeded();
	}

	/**
	 * This is for implementing {@link IEditorPart} and simply saves the model file.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void doSave(IProgressMonitor progressMonitor) {
		// Do the work within an operation because this is a long running activity that modifies the workbench.
		//
		WorkspaceModifyOperation operation = new WorkspaceModifyOperation() {

			// This is the method that gets invoked when the operation runs.
			//
			public void execute(IProgressMonitor monitor) {
				try {
					// Save the resource to the file system.
					//
					Resource savedResource = (Resource) editingDomain
						.getResourceSet().getResources().get(0);
					savedResources.add(savedResource);
					savedResource.save(Collections.EMPTY_MAP);
				} catch (Exception exception) {
					UMLEditorPlugin.INSTANCE.log(exception);
				}
			}
		};

		try {
			// This runs the options, and shows progress.
			//
			new ProgressMonitorDialog(getSite().getShell()).run(true, false,
				operation);

			// Refresh the necessary state.
			//
			((BasicCommandStack) editingDomain.getCommandStack()).saveIsDone();
			firePropertyChange(IEditorPart.PROP_DIRTY);
		} catch (Exception exception) {
			// Something went wrong that shouldn't.
			//
			UMLEditorPlugin.INSTANCE.log(exception);
		}
	}

	/**
	 * This always returns true because it is not currently supported.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public boolean isSaveAsAllowed() {
		return true;
	}

	/**
	 * This also changes the editor's input.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void doSaveAs() {
		SaveAsDialog saveAsDialog = new SaveAsDialog(getSite().getShell());
		saveAsDialog.open();
		IPath path = saveAsDialog.getResult();
		if (path != null) {
			IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile(path);
			if (file != null) {
				doSaveAs(URI.createPlatformResourceURI(file.getFullPath()
					.toString()), new FileEditorInput(file));
			}
		}
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected void doSaveAs(URI uri, IEditorInput editorInput) {
		((Resource) editingDomain.getResourceSet().getResources().get(0))
			.setURI(uri);
		setInputWithNotify(editorInput);
		setPartName(editorInput.getName());
		IProgressMonitor progressMonitor = getActionBars()
			.getStatusLineManager() != null
			? getActionBars().getStatusLineManager().getProgressMonitor()
			: new NullProgressMonitor();
		doSave(progressMonitor);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void gotoMarker(IMarker marker) {
		try {
			if (marker.getType().equals(EValidator.MARKER)) {
				String uriAttribute = marker.getAttribute(
					EValidator.URI_ATTRIBUTE, null);
				if (uriAttribute != null) {
					URI uri = URI.createURI(uriAttribute);
					EObject eObject = editingDomain.getResourceSet()
						.getEObject(uri, true);
					if (eObject != null) {
						setSelectionToViewer(Collections
							.singleton(editingDomain.getWrapper(eObject)));
					}
				}
			}
		} catch (CoreException exception) {
			UMLEditorPlugin.INSTANCE.log(exception);
		}
	}

	/**
	 * This is called during startup.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void init(IEditorSite site, IEditorInput editorInput) {
		setSite(site);
		setInputWithNotify(editorInput);
		setPartName(editorInput.getName());
		site.setSelectionProvider(this);
		site.getPage().addPartListener(partListener);
		ResourcesPlugin.getWorkspace().addResourceChangeListener(
			resourceChangeListener, IResourceChangeEvent.POST_CHANGE);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setFocus() {
		if (currentViewerPane != null) {
			currentViewerPane.setFocus();
		} else {
			getControl(getActivePage()).setFocus();
		}
	}

	/**
	 * This implements {@link org.eclipse.jface.viewers.ISelectionProvider}.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void addSelectionChangedListener(ISelectionChangedListener listener) {
		selectionChangedListeners.add(listener);
	}

	/**
	 * This implements {@link org.eclipse.jface.viewers.ISelectionProvider}.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void removeSelectionChangedListener(
			ISelectionChangedListener listener) {
		selectionChangedListeners.remove(listener);
	}

	/**
	 * This implements {@link org.eclipse.jface.viewers.ISelectionProvider} to return this editor's overall selection.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public ISelection getSelection() {
		return editorSelection;
	}

	/**
	 * This implements {@link org.eclipse.jface.viewers.ISelectionProvider} to set this editor's overall selection.
	 * Calling this result will notify the listeners.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setSelection(ISelection selection) {
		editorSelection = selection;

		for (Iterator listeners = selectionChangedListeners.iterator(); listeners
			.hasNext();) {
			ISelectionChangedListener listener = (ISelectionChangedListener) listeners
				.next();
			listener
				.selectionChanged(new SelectionChangedEvent(this, selection));
		}
		setStatusLineManager(selection);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void setStatusLineManager(ISelection selection) {
		IStatusLineManager statusLineManager = currentViewer != null
			&& currentViewer == contentOutlineViewer
			? contentOutlineStatusLineManager
			: getActionBars().getStatusLineManager();

		if (statusLineManager != null) {
			if (selection instanceof IStructuredSelection) {
				Collection collection = ((IStructuredSelection) selection)
					.toList();
				switch (collection.size()) {
					case 0 : {
						statusLineManager
							.setMessage(getString("_UI_NoObjectSelected")); //$NON-NLS-1$
						break;
					}
					case 1 : {
						String text = new AdapterFactoryItemDelegator(
							adapterFactory).getText(collection.iterator()
							.next());
						statusLineManager.setMessage(getString(
							"_UI_SingleObjectSelected", text)); //$NON-NLS-1$
						break;
					}
					default : {
						statusLineManager
							.setMessage(getString(
								"_UI_MultiObjectSelected", Integer.toString(collection.size()))); //$NON-NLS-1$
						break;
					}
				}
			} else {
				statusLineManager.setMessage(""); //$NON-NLS-1$
			}
		}
	}

	/**
	 * This looks up a string in the plugin's plugin.properties file.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	private static String getString(String key) {
		return UMLEditorPlugin.INSTANCE.getString(key);
	}

	/**
	 * This looks up a string in plugin.properties, making a substitution.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	private static String getString(String key, Object s1) {
		return UMLEditorPlugin.INSTANCE.getString(key, new Object[]{s1});
	}

	/**
	 * This implements {@link org.eclipse.jface.action.IMenuListener} to help fill the context menus with contributions from the Edit menu.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void menuAboutToShow(IMenuManager menuManager) {
		((IMenuListener) getEditorSite().getActionBarContributor())
			.menuAboutToShow(menuManager);
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public EditingDomainActionBarContributor getActionBarContributor() {
		return (EditingDomainActionBarContributor) getEditorSite()
			.getActionBarContributor();
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public IActionBars getActionBars() {
		return getActionBarContributor().getActionBars();
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public AdapterFactory getAdapterFactory() {
		return adapterFactory;
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void dispose() {
		ResourcesPlugin.getWorkspace().removeResourceChangeListener(
			resourceChangeListener);

		getSite().getPage().removePartListener(partListener);

		adapterFactory.dispose();

		if (getActionBarContributor().getActiveEditor() == this) {
			getActionBarContributor().setActiveEditor(null);
		}

		if (propertySheetPage != null) {
			propertySheetPage.dispose();
		}

		if (contentOutlinePage != null) {
			contentOutlinePage.dispose();
		}

		super.dispose();
	}

}