/**
 * Copyright (c) 2002-2006 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v20.html
 *
 * Contributors:
 *   IBM - Initial API and implementation
 */
package org.eclipse.emf.java.presentation;


import java.io.IOException;
import java.io.InputStream;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EventObject;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.IWorkspaceRoot;
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.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
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.util.LocalSelectionTransfer;
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.FileTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
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.PartInitException;
import org.eclipse.ui.actions.WorkspaceModifyOperation;
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.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.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;

import org.eclipse.emf.common.ui.MarkerHelper;
import org.eclipse.emf.common.ui.ViewerPane;
import org.eclipse.emf.common.ui.editor.ProblemEditorPart;

import org.eclipse.emf.common.ui.viewer.IViewerProvider;
import org.eclipse.emf.common.util.BasicDiagnostic;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.common.util.UniqueEList;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EContentAdapter;
import org.eclipse.emf.ecore.util.EcoreUtil;
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.provider.UnwrappingSelectionProvider;
import org.eclipse.emf.edit.ui.util.EditUIMarkerHelper;

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

import org.eclipse.emf.java.JClass;
import org.eclipse.emf.java.JCompilationUnit;
import org.eclipse.emf.java.provider.JavaItemProviderAdapterFactory;
import org.eclipse.emf.java.util.JavaPackageResourceFactoryImpl;
import org.eclipse.emf.java.util.JavaPackageResourceImpl;
import org.eclipse.emf.java.util.JavaResourceFactoryImpl;
import org.eclipse.emf.java.util.JavaUtil;

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


/**
 * This is an example of a Java model editor.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 * @generated
 */
public class JavaEditor 
  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 List<PropertySheetPage> propertySheetPages = new ArrayList<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;

  /**
   * The MarkerHelper is responsible for creating workspace resource markers presented
   * in Eclipse's Problems View.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected MarkerHelper markerHelper = new EditUIMarkerHelper();

  /**
   * 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(JavaEditor.this);

            setCurrentViewer(contentOutlineViewer);
          }
        }
        else if (p instanceof PropertySheet)
        {
          if (propertySheetPages.contains(((PropertySheet)p).getCurrentPage()))
          {
            getActionBarContributor().setActiveEditor(JavaEditor.this);
            handleActivate();
          }
        }
        else if (p == JavaEditor.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.
   * @generated
   */
  protected Collection<Resource> removedResources = new ArrayList<Resource>();

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

  /**
   * Resources that have been saved.
   * @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()
    {
      protected boolean dispatching;

      @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);
              }
              dispatchUpdateProblemIndication();
              break;
            }
          }
        }
        else
        {
          super.notifyChanged(notification);
        }
      }

      protected void dispatchUpdateProblemIndication()
      {
        if (updateProblemIndication && !dispatching)
        {
          dispatching = true;
          getSite().getShell().getDisplay().asyncExec
            (new Runnable()
             {
               public void run()
               {
                 dispatching = false;
                 updateProblemIndication();
               }
             });
        }
      }

      @Override
      protected void setTarget(Resource target)
      {
        basicSetTarget(target);
      }

      @Override
      protected void unsetTarget(Resource target)
      {
        basicUnsetTarget(target);
        resourceToDiagnosticMap.remove(target);
        dispatchUpdateProblemIndication();
      }
    };

  /**
   * This listens for workspace changes.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected IResourceChangeListener resourceChangeListener =
    new IResourceChangeListener()
    {
      public void resourceChanged(IResourceChangeEvent event)
      {
        IResourceDelta delta = event.getDelta();
        try
        {
          class ResourceDeltaVisitor implements IResourceDeltaVisitor
          {
            protected ResourceSet resourceSet = editingDomain.getResourceSet();
            protected Collection<Resource> changedResources = new ArrayList<Resource>();
            protected Collection<Resource> removedResources = new ArrayList<Resource>();

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

              return true;
            }

            public Collection<Resource> getChangedResources()
            {
              return changedResources;
            }

            public Collection<Resource> getRemovedResources()
            {
              return removedResources;
            }
          }

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

          if (!visitor.getRemovedResources().isEmpty())
          {
            getSite().getShell().getDisplay().asyncExec
              (new Runnable()
               {
                 public void run()
                 {
                   removedResources.addAll(visitor.getRemovedResources());
                   if (!isDirty())
                   {
                     getSite().getPage().closeEditor(JavaEditor.this, false);
                   }
                 }
               });
          }

          if (!visitor.getChangedResources().isEmpty())
          {
            getSite().getShell().getDisplay().asyncExec
              (new Runnable()
               {
                 public void run()
                 {
                   changedResources.addAll(visitor.getChangedResources());
                   if (getSite().getPage().getActiveEditor() == JavaEditor.this)
                   {
                     handleActivate();
                   }
                 }
               });
          }
        }
        catch (CoreException exception)
        {
          JavaEditorPlugin.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(JavaEditor.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.
   * @generated
   */
  protected void handleChangedResources()
  {
    if (!changedResources.isEmpty() && (!isDirty() || handleDirtyConflict()))
    {
      ResourceSet resourceSet = editingDomain.getResourceSet();
      if (isDirty())
      {
        changedResources.addAll(resourceSet.getResources());
      }
      editingDomain.getCommandStack().flush();

      updateProblemIndication = false;
      for (Resource resource : changedResources)
      {
        if (resource.isLoaded())
        {
          resource.unload();
          try
          {
            resource.load(resourceSet.getLoadOptions());
          }
          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,
           "org.eclipse.emf.java.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);
        problemEditorPart.setMarkerHelper(markerHelper);
        try
        {
          addPage(++lastEditorPage, problemEditorPart, getEditorInput());
          setPageText(lastEditorPage, problemEditorPart.getPartName());
          setActivePage(lastEditorPage);
          showTabs();
        }
        catch (PartInitException exception)
        {
          JavaEditorPlugin.INSTANCE.log(exception);
        }
      }

      if (markerHelper.hasMarkers(editingDomain.getResourceSet()))
      {
        try
        {
          markerHelper.updateMarkers(diagnostic);
        }
        catch (CoreException exception)
        {
          JavaEditorPlugin.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"),
         getString("_WARN_FileConflict"));
  }

  /**
   * This creates a model editor.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public JavaEditor()
  {
    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 JavaItemProviderAdapterFactory());
    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());
                  }
                  for (Iterator<PropertySheetPage> i = propertySheetPages.iterator(); i.hasNext(); )
                  {
                    PropertySheetPage propertySheetPage = i.next();
                    if (propertySheetPage.getControl() == null || propertySheetPage.getControl().isDisposed())
                    {
                      i.remove();
                    }
                    else
                    {
                      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())
    {
      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);
            }
          }
        };
      getSite().getShell().getDisplay().asyncExec(runnable);
    }
  }

  /**
   * 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(), LocalSelectionTransfer.getTransfer(), FileTransfer.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(), editingDomain.getResourceSet().getURIConverter());
    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) 
  {
    boolean hasErrors = !resource.getErrors().isEmpty();
    if (hasErrors || !resource.getWarnings().isEmpty())
    {
      BasicDiagnostic basicDiagnostic =
        new BasicDiagnostic
          (hasErrors ? Diagnostic.ERROR : Diagnostic.WARNING,
           "org.eclipse.emf.java.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,
           "org.eclipse.emf.java.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.
   * @generated EATM
   */
  @Override
  public void createPages()
  {
    // I assume that the input is a file object.
    //
    IFileEditorInput modelFile = (IFileEditorInput)getEditorInput();

    try
    {
      Map<String, Object> extensionToFactoryMap = editingDomain.getResourceSet().getResourceFactoryRegistry().getExtensionToFactoryMap();
      extensionToFactoryMap.put("java", new JavaResourceFactoryImpl());
      extensionToFactoryMap.put("packages", new JavaPackageResourceFactoryImpl());
      
      setupClassLoader(modelFile.getFile().getProject());

      // Load the resource through the editing domain.
      //
      editingDomain.loadResource
        (URI.createPlatformResourceURI(modelFile.getFile().getFullPath().toString(), true).toString());

      Map<EObject, Collection<EStructuralFeature.Setting>> map = 
        new EcoreUtil.UnresolvedProxyCrossReferencer(editingDomain.getResourceSet())
        {
          private static final long serialVersionUID = 1L;

          @Override
          protected TreeIterator<Notifier> newContentsIterator()
          {
            return 
              new EcoreUtil.ContentTreeIterator<Notifier>(emfObjects)
              {
                private static final long serialVersionUID = 1L;

                @Override
                protected Iterator<? extends EObject> getEObjectChildren(EObject eObject)
                {
                  if (eObject instanceof JCompilationUnit)
                  {
                    // final JCompilationUnit jCompilationUnit = (JCompilationUnit)eObject;
                    final List<JClass> types = ((JCompilationUnit)eObject).getTypes();
                    return 
                      new Iterator<EObject>()
                      {
                        int index = 0;
  
                        public boolean hasNext()
                        {
                          return index < types.size();
                        }
  
                        public EObject next()
                        {
                          return types.get(index++);
                        }
  
                        public void remove()
                        {
                          throw new UnsupportedOperationException();
                        }
                      };
                  }
                  else
                  {
                    return super.getEObjectChildren(eObject);
                  }
                }
  
                @Override
                protected Iterator<EObject> getResourceChildren(Resource r)
                {
                    final List<EObject> contents = r.getContents();
                    return 
                      new Iterator<EObject>()
                      {
                        int index = 0;
  
                        public boolean hasNext()
                        {
                          return index < contents.size();
                        }
  
                        public EObject next()
                        {
                          return contents.get(index++);
                        }
  
                        public void remove()
                        {
                          throw new UnsupportedOperationException();
                        }
                      };
                }
              };
          }
  
  /*
          protected void handleCrossReference(EObject eObject)
          {
            if (eObject instanceof JCompilationUnit)
            {
              JCompilationUnit jCompilationUnit =  (JCompilationUnit)eObject;
              if (".class".equals(jCompilationUnit.getName()))
              {
                List types = jCompilationUnit.getTypes();
                for (int i = 0; i < types.size(); ++i)
                {
                  JClass jClass = (JClass)types.get(i);
                  crossReference(jCompilationUnit, JavaPackage.eINSTANCE.getJCompilationUnit_Types(), jClass);
                }
                return;
              }
            }
  
            super.handleCrossReference(eObject);
          }
  */
  
          @Override
          public Map<EObject, Collection<EStructuralFeature.Setting>> findUnresolvedProxyCrossReferences()
          {
            // EATM MEGA KLUDGE.
            crossReference();
  
            return super.findUnresolvedProxyCrossReferences();
          }
        }.findUnresolvedProxyCrossReferences();

      for (Map.Entry<?, ?> entry : map.entrySet())
      {
        System.err.println("Unresolved proxy: " + entry);
      }

      // The one object in the resource's extent should be the root object.
      //
      // rootObject = (EObject)((Resource)editingDomain.getResourceSet().getResources().iterator().next()).getContents().get(0);
    }
    catch (Exception exception)
    {
      exception.printStackTrace();
    }

    // Create a page for the selection tree view.
    //
    {
      ViewerPane viewerPane =
        new ViewerPane(getSite().getPage(), JavaEditor.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(), JavaEditor.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(), JavaEditor.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(), JavaEditor.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(), JavaEditor.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(), JavaEditor.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"));
    }

    setActivePage(0);
  }

  /**
   * 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)
      {
        Point point = getContainer().getSize();
        Rectangle clientArea = getContainer().getClientArea();
        getContainer().setSize(point.x,  2 * point.y - clientArea.height - clientArea.y);
      }
    }
  }

  /**
   * 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)
      {
        Point point = getContainer().getSize();
        Rectangle clientArea = getContainer().getClientArea();
        getContainer().setSize(point.x, clientArea.height + clientArea.y);
      }
    }
  }

  /**
   * 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({ "rawtypes", "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 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
      {
        @Override
        public void createControl(Composite parent)
        {
          super.createControl(parent);
          contentOutlineViewer = getTreeViewer();
          contentOutlineViewer.addSelectionChangedListener(this);

          // Set up the tree viewer.
          //
          contentOutlineViewer.setUseHashlookup(true);
          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()
  {
    PropertySheetPage propertySheetPage =
      new ExtendedPropertySheetPage(editingDomain, ExtendedPropertySheetPage.Decoration.NONE, null, 0, false)
      {
        @Override
        public void setSelectionToViewer(List<?> selection)
        {
          JavaEditor.this.setSelectionToViewer(selection);
          JavaEditor.this.setFocus();
        }

        @Override
        public void setActionBars(IActionBars actionBars)
        {
          super.setActionBars(actionBars);
          getActionBarContributor().shareGlobalActions(this, actionBars);
        }
      };
    propertySheetPage.setPropertySourceProvider(new AdapterFactoryContentProvider(adapterFactory));
    propertySheetPages.add(propertySheetPage);

    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>();
          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
   */
  @Override
  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
   */
  @Override
  public void doSave(IProgressMonitor progressMonitor)
  {
    // Save only resources that have actually changed.
    //
    final Map<Object, Object> saveOptions = new HashMap<Object, Object>();
    saveOptions.put(Resource.OPTION_SAVE_ONLY_IF_CHANGED, Resource.OPTION_SAVE_ONLY_IF_CHANGED_MEMORY_BUFFER);
    saveOptions.put(Resource.OPTION_LINE_DELIMITER, Resource.OPTION_LINE_DELIMITER_UNSPECIFIED);

    // 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.
        //
        @Override
        public void execute(IProgressMonitor monitor)
        {
          // Save the resources to the file system.
          //
          boolean first = true;
          List<Resource> resources = editingDomain.getResourceSet().getResources();
          for (int i = 0; i < resources.size(); ++i)
          {
            Resource resource = resources.get(i);
            if ((first || !resource.getContents().isEmpty() || isPersisted(resource)) && !editingDomain.isReadOnly(resource))
            {
              try
              {
                long timeStamp = resource.getTimeStamp();
                resource.save(saveOptions);
                if (resource.getTimeStamp() != timeStamp)
                {
                  savedResources.add(resource);
                }
              }
              catch (Exception exception)
              {
                resourceToDiagnosticMap.put(resource, analyzeResourceProblems(resource, exception));
              }
              first = false;
            }
          }
        }
      };

    updateProblemIndication = false;
    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.
      //
      JavaEditorPlugin.INSTANCE.log(exception);
    }
    updateProblemIndication = true;
    updateProblemIndication();
  }

  /**
   * This returns whether something has been persisted to the URI of the specified resource.
   * The implementation uses the URI converter from the editor's resource set to try to open an input stream.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected boolean isPersisted(Resource resource)
  {
    boolean result = false;
    try
    {
      InputStream stream = editingDomain.getResourceSet().getURIConverter().createInputStream(resource.getURI());
      if (stream != null)
      {
        result = true;
        stream.close();
      }
    }
    catch (IOException e)
    {
      // Ignore
    }
    return result;
  }

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

  /**
   * This also changes the editor's input.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  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(), true), new FileEditorInput(file));
      }
    }
  }

  /**
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected void doSaveAs(URI uri, IEditorInput editorInput)
  {
    (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)
  {
    List<?> targetObjects = markerHelper.getTargetObjects(editingDomain, marker);
    if (!targetObjects.isEmpty())
    {
      setSelectionToViewer(targetObjects);
    }
  }

  /**
   * This is called during startup.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public void init(IEditorSite site, IEditorInput editorInput) throws PartInitException, PartInitException, PartInitException, PartInitException, PartInitException
  {
    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
   */
  @Override
  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 (ISelectionChangedListener listener : selectionChangedListeners)
    {
      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"));
            break;
          }
          case 1:
          {
            String text = new AdapterFactoryItemDelegator(adapterFactory).getText(collection.iterator().next());
            statusLineManager.setMessage(getString("_UI_SingleObjectSelected", text));
            break;
          }
          default:
          {
            statusLineManager.setMessage(getString("_UI_MultiObjectSelected", Integer.toString(collection.size())));
            break;
          }
        }
      }
      else
      {
        statusLineManager.setMessage("");
      }
    }
  }

  /**
   * 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 JavaEditorPlugin.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 JavaEditorPlugin.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
   */
  @Override
  public void dispose()
  {
    updateProblemIndication = false;

    ResourcesPlugin.getWorkspace().removeResourceChangeListener(resourceChangeListener);

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

    adapterFactory.dispose();

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

    for (PropertySheetPage propertySheetPage : propertySheetPages)
    {
      propertySheetPage.dispose();
    }

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

    super.dispose();
  }

  /**
   * Returns whether the outline view should be presented to the user.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected boolean showOutlineView()
  {
    return true;
  }
  public void setupClassLoader(IProject project)
  {
    JavaPackageResourceImpl javaPackageResource = 
      (JavaPackageResourceImpl)editingDomain.loadResource(JavaUtil.JAVA_PACKAGE_RESOURCE);

    IWorkspaceRoot workspaceRoot = project.getWorkspace().getRoot();

    List<URL> libraryURLs = new UniqueEList<URL>();
    List<String> sourceURIs = new ArrayList<String>();
    try
    {
      IJavaProject javaProject = JavaCore.create(project);
      IClasspathEntry [] classpath = javaProject.getResolvedClasspath(true);
      if (classpath != null)
      {
        for (int i = 0; i < classpath.length; ++i)
        {
          IClasspathEntry classpathEntry =  classpath[i];
          switch (classpathEntry.getEntryKind())
          {
            case IClasspathEntry.CPE_LIBRARY:
            case IClasspathEntry.CPE_CONTAINER:
            {
              libraryURLs.add(new URL(URI.createFileURI(classpathEntry.getPath().toString()).toString()));
              break;
            }
            case IClasspathEntry.CPE_SOURCE:
            {
              sourceURIs.add(URI.createPlatformResourceURI(classpathEntry.getPath().toString(), true) + "/");
              break;
            }
            case IClasspathEntry.CPE_PROJECT:
            {
              IProject referencedProject = workspaceRoot.getProject(classpathEntry.getPath().segment(0));
              IJavaProject referencedJavaProject = JavaCore.create(referencedProject);
              IContainer container = workspaceRoot.getFolder(referencedJavaProject.getOutputLocation());
              libraryURLs.add(new URL(URI.createFileURI(container.getLocation().toString() + "/").toString()));

              getAllReferencedProjects(libraryURLs, referencedProject.getDescription().getReferencedProjects());
              getAllReferencedProjects(libraryURLs, referencedProject.getDescription().getDynamicReferences());
              break;
            }
            case IClasspathEntry.CPE_VARIABLE:
            default:
            {
              break;
            }
          }
        }
      }

      javaPackageResource.setClassLoader
        (new URLClassLoader
          (libraryURLs.toArray(new URL [libraryURLs.size()]), 
           new URLClassLoader(new URL [0], null)));
      javaPackageResource.getSourceURIs().addAll(sourceURIs);
    }
    catch (MalformedURLException exception)
    {
      exception.printStackTrace();
    }
    catch (JavaModelException exception)
    {
      exception.printStackTrace();
    }
    catch (CoreException exception)
    {
      exception.printStackTrace();
    }
  }

  /**
   * Walks the projects recursively.
   */
  public void getAllReferencedProjects(Collection<URL> libraryURLs, IProject [] projects) throws CoreException, MalformedURLException
  {
    for (int i = 0; i < projects.length; ++i)
    {
      IProject project = projects[i];
      if (project.exists() && project.isOpen())
      {
        IJavaProject referencedJavaProject = JavaCore.create(project);
        IContainer container = project.getWorkspace().getRoot().getFolder(referencedJavaProject.getOutputLocation());

        libraryURLs.add(new URL(URI.createFileURI(container.getLocation().toString() + "/").toString()));
        getAllReferencedProjects(libraryURLs, project.getDescription().getReferencedProjects());
        getAllReferencedProjects(libraryURLs, project.getDescription().getDynamicReferences());
      }
    }
  }
}