private void openSchemaFile(final IFile file) {
    final IWorkbenchWindow ww = PDEPlugin.getActiveWorkbenchWindow();

    Display d = ww.getShell().getDisplay();
    d.asyncExec(
        new Runnable() {
          @Override
          public void run() {
            try {
              String editorId = IPDEUIConstants.SCHEMA_EDITOR_ID;
              ww.getActivePage().openEditor(new FileEditorInput(file), editorId);
            } catch (PartInitException e) {
              PDEPlugin.logException(e);
            }
          }
        });
  }
  @Override
  public void createContents(Composite parent) {
    parent.setLayout(FormLayoutFactory.createDetailsGridLayout(false, 1));
    FormToolkit toolkit = getManagedForm().getToolkit();
    Section section =
        toolkit.createSection(parent, Section.DESCRIPTION | ExpandableComposite.TITLE_BAR);
    section.clientVerticalSpacing = FormLayoutFactory.SECTION_HEADER_VERTICAL_SPACING;
    section.setText(PDEUIMessages.ExtensionPointDetails_title);
    section.setDescription(PDEUIMessages.ExtensionPointDetails_desc);
    section.setLayout(FormLayoutFactory.createClearGridLayout(false, 1));
    section.setLayoutData(
        new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING));

    Composite client = toolkit.createComposite(section);
    client.setLayout(FormLayoutFactory.createSectionClientGridLayout(false, 3));
    client.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

    fIdEntry = new FormEntry(client, toolkit, PDEUIMessages.ExtensionPointDetails_id, null, false);
    fIdEntry.setFormEntryListener(
        new FormEntryAdapter(this) {
          @Override
          public void textValueChanged(FormEntry entry) {
            if (fInput != null) {
              try {
                fInput.setId(fIdEntry.getValue());
              } catch (CoreException e) {
                PDEPlugin.logException(e);
              }
            }
          }
        });
    fNameEntry =
        new FormEntry(client, toolkit, PDEUIMessages.ExtensionPointDetails_name, null, false);
    fNameEntry.setFormEntryListener(
        new FormEntryAdapter(this) {
          @Override
          public void textValueChanged(FormEntry entry) {
            if (fInput != null)
              try {
                fInput.setName(fNameEntry.getValue());
              } catch (CoreException e) {
                PDEPlugin.logException(e);
              }
          }
        });
    boolean editable = getPage().getModel().isEditable();
    fSchemaEntry =
        new FormEntry(
            client,
            toolkit,
            PDEUIMessages.ExtensionPointDetails_schema,
            PDEUIMessages.ExtensionPointDetails_browse,
            editable); //
    fSchemaEntry.setFormEntryListener(
        new FormEntryAdapter(this) {
          @Override
          public void textValueChanged(FormEntry entry) {
            if (fInput != null) {
              try {
                fInput.setSchema(fSchemaEntry.getValue());
              } catch (CoreException e) {
                PDEPlugin.logException(e);
              }
              updateRichText();
            }
          }

          @Override
          public void linkActivated(HyperlinkEvent e) {
            IProject project = getPage().getPDEEditor().getCommonProject();
            if (fSchemaEntry.getValue() == null || fSchemaEntry.getValue().length() == 0) {
              generateSchema();
              return;
            }
            IFile file = project.getFile(fSchemaEntry.getValue());
            if (file.exists()) openSchemaFile(file);
            else generateSchema();
          }

          @Override
          public void browseButtonSelected(FormEntry entry) {
            final IProject project = getPage().getPDEEditor().getCommonProject();
            ElementTreeSelectionDialog dialog =
                new ElementTreeSelectionDialog(
                    PDEPlugin.getActiveWorkbenchShell(),
                    new WorkbenchLabelProvider(),
                    new WorkbenchContentProvider());
            dialog.setTitle(
                PDEUIMessages.ManifestEditor_ExtensionPointDetails_schemaLocation_title);
            dialog.setMessage(
                PDEUIMessages.ManifestEditor_ExtensionPointDetails_schemaLocation_desc);
            dialog.setDoubleClickSelects(false);
            dialog.setAllowMultiple(false);
            dialog.addFilter(
                new ViewerFilter() {
                  @Override
                  public boolean select(Viewer viewer, Object parent, Object element) {
                    if (element instanceof IFile) {
                      String ext = ((IFile) element).getFullPath().getFileExtension();
                      return "exsd".equals(ext) || "mxsd".equals(ext); // $NON-NLS-1$ //$NON-NLS-2$
                    } else if (element instanceof IContainer) { // i.e. IProject, IFolder
                      try {
                        IResource[] resources = ((IContainer) element).members();
                        for (IResource resource : resources) {
                          if (select(viewer, parent, resource)) return true;
                        }
                      } catch (CoreException e) {
                        PDEPlugin.logException(e);
                      }
                    }
                    return false;
                  }
                });
            dialog.setValidator(
                new ISelectionStatusValidator() {
                  @Override
                  public IStatus validate(Object[] selection) {
                    IPluginModelBase model =
                        (IPluginModelBase) getPage().getPDEEditor().getAggregateModel();
                    String pluginName = model.getPluginBase().getId();

                    if (selection == null
                        || selection.length != 1
                        || !(selection[0] instanceof IFile))
                      return new Status(
                          IStatus.ERROR,
                          pluginName,
                          IStatus.ERROR,
                          PDEUIMessages.ManifestEditor_ExtensionPointDetails_validate_errorStatus,
                          null);
                    IFile file = (IFile) selection[0];
                    String ext = file.getFullPath().getFileExtension();
                    if ("exsd".equals(ext) || "mxsd".equals(ext)) // $NON-NLS-1$ //$NON-NLS-2$
                    return new Status(IStatus.OK, pluginName, IStatus.OK, "", null); // $NON-NLS-1$
                    return new Status(
                        IStatus.ERROR,
                        pluginName,
                        IStatus.ERROR,
                        PDEUIMessages.ManifestEditor_ExtensionPointDetails_validate_errorStatus,
                        null);
                  }
                });
            dialog.setDoubleClickSelects(true);
            dialog.setStatusLineAboveButtons(true);
            dialog.setInput(project);
            dialog.setComparator(new ResourceComparator(ResourceComparator.NAME));
            String filePath = fSchemaEntry.getValue();
            if (filePath != null && filePath.length() != 0 && project.exists(new Path(filePath)))
              dialog.setInitialSelection(project.getFile(new Path(filePath)));
            else dialog.setInitialSelection(null);
            dialog.create();
            PlatformUI.getWorkbench()
                .getHelpSystem()
                .setHelp(dialog.getShell(), IHelpContextIds.BROWSE_EXTENSION_POINTS_SCHEMAS);
            if (dialog.open() == Window.OK) {
              Object[] elements = dialog.getResult();
              if (elements.length > 0) {
                IResource elem = (IResource) elements[0];
                fSchemaEntry.setValue(elem.getProjectRelativePath().toString());
              }
            }
          }
        });
    createSpacer(toolkit, client, 2);

    Composite container = toolkit.createComposite(parent, SWT.NONE);
    container.setLayout(FormLayoutFactory.createSectionClientGridLayout(false, 1));
    container.setLayoutData(
        new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING));

    fRichText = toolkit.createFormText(container, true);
    fRichText.setImage(
        "open",
        PDEPlugin.getDefault()
            .getLabelProvider()
            .get( //$NON-NLS-1$
                PDEPluginImages.DESC_SCHEMA_OBJ));
    fRichText.setImage(
        "desc",
        PDEPlugin.getDefault()
            .getLabelProvider()
            .get( //$NON-NLS-1$
                PDEPluginImages.DESC_DOC_SECTION_OBJ));
    fRichText.setImage(
        "search",
        PDEPlugin.getDefault()
            .getLabelProvider()
            .get( //$NON-NLS-1$
                PDEPluginImages.DESC_PSEARCH_OBJ));
    fRichText.addHyperlinkListener(
        new HyperlinkAdapter() {
          @Override
          public void linkActivated(HyperlinkEvent e) {
            IBaseModel model = getPage().getPDEEditor().getAggregateModel();
            String pointID = null;
            IPluginBase base = ((IPluginModelBase) model).getPluginBase();
            String pluginID = base.getId();
            String schemaVersion = base.getSchemaVersion();
            if (schemaVersion != null && Double.parseDouble(schemaVersion) >= 3.2) {
              if (fInput.getId().indexOf('.') != -1) pointID = fInput.getId();
            }
            if (pointID == null) pointID = pluginID + "." + fInput.getId(); // $NON-NLS-1$
            IPluginExtensionPoint extPoint =
                PDECore.getDefault().getExtensionsRegistry().findExtensionPoint(pointID);
            if (e.getHref().equals("search")) { // $NON-NLS-1$
              new FindReferencesAction(fInput, pluginID).run();
            } else if (e.getHref().equals("open")) { // $NON-NLS-1$
              if (extPoint == null) {
                IProject project = getPage().getPDEEditor().getCommonProject();
                IFile file = project.getFile(fSchemaEntry.getValue());
                if (file.exists()) openSchemaFile(file);
                else generateSchema();
                return;
              }
              OpenSchemaAction action = new OpenSchemaAction();
              action.setInput(pointID);
              action.setEnabled(true);
              action.run();
            } else {
              if (extPoint == null) {
                IProject project = getPage().getPDEEditor().getCommonProject();
                IFile file = project.getFile(fSchemaEntry.getValue());
                URL url;
                try {
                  url = file.getLocationURI().toURL();
                } catch (MalformedURLException e1) {
                  return;
                }
                SchemaDescriptor schemaDesc = new SchemaDescriptor(pointID, url);
                Schema schema = new Schema(schemaDesc, url, false);
                schema.setPluginId(pluginID);
                schema.setPointId(fInput.getId());
                schema.setName(fNameEntry.getValue());
                new ShowDescriptionAction(schema).run();
                return;
              }
              new ShowDescriptionAction(pointID).run();
            }
          }
        });

    fIdEntry.setEditable(isEditable());
    fNameEntry.setEditable(isEditable());
    fSchemaEntry.setEditable(isEditable());
    toolkit.paintBordersFor(client);
    section.setClient(client);
    IPluginModelBase model = (IPluginModelBase) getPage().getModel();
    model.addModelChangedListener(this);
    markDetailsPart(section);
  }
  /* (non-Javadoc)
   * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
   */
  public Object execute(ExecutionEvent event) throws ExecutionException {
    ISelection selection = HandlerUtil.getCurrentSelection(event);
    if (selection instanceof IStructuredSelection) {
      IStructuredSelection ssel = (IStructuredSelection) selection;
      Iterator it = ssel.iterator();
      final HashSet projects = new HashSet();
      while (it.hasNext()) {
        Object element = it.next();
        IProject proj = null;
        if (element instanceof IFile) proj = ((IFile) element).getProject();
        if ((proj == null) && (element instanceof IProject)) proj = (IProject) element;
        if ((proj == null) && (element instanceof IAdaptable)) {
          IResource resource = (IResource) ((IAdaptable) element).getAdapter(IResource.class);
          if (resource != null) {
            proj = resource.getProject();
          }
          if (proj == null) {
            IWorkbenchAdapter workbenchAdapter =
                (IWorkbenchAdapter) ((IAdaptable) element).getAdapter(IWorkbenchAdapter.class);
            if (workbenchAdapter != null) {
              Object o = workbenchAdapter.getParent(element);
              if (o instanceof IAdaptable) {
                resource = (IResource) ((IAdaptable) o).getAdapter(IResource.class);
                if (resource != null) {
                  proj = resource.getProject();
                }
              }
            }
          }
        }

        if (proj != null && WorkspaceModelManager.isPluginProject(proj)) projects.add(proj);
      }
      if (projects.size() > 0) {
        BusyIndicator.showWhile(
            PDEPlugin.getActiveWorkbenchShell().getDisplay(),
            new Runnable() {
              public void run() {
                Iterator it = projects.iterator();
                while (it.hasNext()) {
                  IProject project = (IProject) it.next();
                  IFile file = PDEProject.getManifest(project);
                  if (file == null || !file.exists()) file = PDEProject.getPluginXml(project);
                  if (file == null || !file.exists()) file = PDEProject.getFragmentXml(project);
                  if (file == null || !file.exists())
                    MessageDialog.openError(
                        PDEPlugin.getActiveWorkbenchShell(),
                        PDEUIMessages.OpenManifestsAction_title,
                        NLS.bind(PDEUIMessages.OpenManifestsAction_cannotFind, project.getName()));
                  else
                    try {
                      IDE.openEditor(
                          PDEPlugin.getActivePage(), file, IPDEUIConstants.MANIFEST_EDITOR_ID);
                    } catch (PartInitException e) {
                      MessageDialog.openError(
                          PDEPlugin.getActiveWorkbenchShell(),
                          PDEUIMessages.OpenManifestsAction_title,
                          NLS.bind(
                              PDEUIMessages.OpenManifestsAction_cannotOpen, project.getName()));
                    }
                }
              }
            });
      } else
        MessageDialog.openInformation(
            PDEPlugin.getActiveWorkbenchShell(),
            PDEUIMessages.OpenManifestsAction_title,
            PDEUIMessages.OpenManifestAction_noManifest);
    }
    return null;
  }