Examples of org.eclipse.ui.IMemento

org.eclipse.ui.IMemento
Interface to a memento used for saving the important state of an object in a form that can be persisted in the file system.
Mementos were designed with the following requirements in mind:
1. Certain objects need to be saved and restored across platform sessions.
2. When an object is restored, an appropriate class for an object might not be available. It must be possible to skip an object in this case.
3. When an object is restored, the appropriate class for the object may be different from the one when the object was originally saved. If so, the new class should still be able to read the old form of the data.
Mementos meet these requirements by providing support for storing a mapping of arbitrary string keys to primitive values, and by allowing mementos to have other mementos as children (arranged into a tree). A robust external storage format based on XML is used.
The key for an attribute may be any alpha numeric value. However, the value of TAG_ID is reserved for internal use.
This interface is not intended to be implemented or extended by clients.
@see IPersistableElement @see IElementFactory

        MultiStatus result = new MultiStatus(PlatformUI.PLUGIN_ID, IStatus.OK,
                WorkbenchMessages.Perspective_problemsRestoringViews, null); 


        for (int x = 0; x < views.length; x++) {
            // Get the view details.
            IMemento childMem = views[x];
            String id = childMem.getString(IWorkbenchConstants.TAG_ID);
            // skip creation of the intro reference -  it's handled elsewhere.
            if (id.equals(IIntroConstants.INTRO_VIEW_ID)) {
        continue;
      }


            String secondaryId = ViewFactory.extractSecondaryId(id);
            if (secondaryId != null) {
                id = ViewFactory.extractPrimaryId(id);
            }
            // Create and open the view.
            try {
                if (!"true".equals(childMem.getString(IWorkbenchConstants.TAG_REMOVED))) { //$NON-NLS-1$
                    viewFactory.createView(id, secondaryId);
                }
            } catch (PartInitException e) {
                childMem.putString(IWorkbenchConstants.TAG_REMOVED, "true"); //$NON-NLS-1$
                result.add(StatusUtil.newStatus(IStatus.ERROR,
                        e.getMessage() == null ? "" : e.getMessage(), //$NON-NLS-1$
                        e));
            }
        }

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        MultiStatus result = new MultiStatus(
                PlatformUI.PLUGIN_ID,
                IStatus.OK,
                WorkbenchMessages.Perspective_problemsRestoringPerspective, null);


        IMemento memento = this.memento;
        this.memento = null;


        final IMemento boundsMem = memento.getChild(IWorkbenchConstants.TAG_WINDOW);
        if (boundsMem != null) {
          final Rectangle r = new Rectangle(0, 0, 0, 0);
            r.x = boundsMem.getInteger(IWorkbenchConstants.TAG_X).intValue();
            r.y = boundsMem.getInteger(IWorkbenchConstants.TAG_Y).intValue();
            r.height = boundsMem.getInteger(IWorkbenchConstants.TAG_HEIGHT)
                    .intValue();
            r.width = boundsMem.getInteger(IWorkbenchConstants.TAG_WIDTH)
                    .intValue();
          StartupThreading.runWithoutExceptions(new StartupRunnable() {


        public void runWithException() throws Throwable {
          if (page.getWorkbenchWindow().getPages().length == 0) {
                    page.getWorkbenchWindow().getShell().setBounds(r);
                }
        }
      });


        }


        // Create an empty presentation..
        final PerspectiveHelper [] presArray = new PerspectiveHelper[1];
        StartupThreading.runWithoutExceptions(new StartupRunnable() {


      public void runWithException() throws Throwable {
        ViewSashContainer mainLayout = new ViewSashContainer(page, getClientComposite());
        presArray[0] = new PerspectiveHelper(page, mainLayout, Perspective.this);
      }});
        final PerspectiveHelper pres = presArray[0];


        // Read the layout.
        result.merge(pres.restoreState(memento
                .getChild(IWorkbenchConstants.TAG_LAYOUT)));


        StartupThreading.runWithoutExceptions(new StartupRunnable() {


      public void runWithException() throws Throwable {
        // Add the editor workbook. Do not hide it now.
            pres.replacePlaceholderWithPart(editorArea);
      }});


        // Add the visible views.
        IMemento[] views = memento.getChildren(IWorkbenchConstants.TAG_VIEW);


        for (int x = 0; x < views.length; x++) {
            // Get the view details.
            IMemento childMem = views[x];
            String id = childMem.getString(IWorkbenchConstants.TAG_ID);
            String secondaryId = ViewFactory.extractSecondaryId(id);
            if (secondaryId != null) {
                id = ViewFactory.extractPrimaryId(id);
            }


            // skip the intro as it is restored higher up in workbench.
            if (id.equals(IIntroConstants.INTRO_VIEW_ID)) {
        continue;
      }
            
            // Create and open the view.
            IViewReference viewRef = viewFactory.getView(id, secondaryId);
            WorkbenchPartReference ref = (WorkbenchPartReference) viewRef;


            // report error
            if (ref == null) {
                String key = ViewFactory.getKey(id, secondaryId);
                result.add(new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, 0,
                        NLS.bind(WorkbenchMessages.Perspective_couldNotFind,  key ), null));
                continue;
            }
            boolean willPartBeVisible = pres.willPartBeVisible(ref.getId(),
                    secondaryId);
            if (willPartBeVisible) {
                IViewPart view = (IViewPart) ref.getPart(true);
                if (view != null) {
                    ViewSite site = (ViewSite) view.getSite();
                    ViewPane pane = (ViewPane) site.getPane();
                    pres.replacePlaceholderWithPart(pane);
                }
            } else {
                pres.replacePlaceholderWithPart(ref.getPane());
            }
        }


        // Load the fast views
        if (fastViewManager != null)
          fastViewManager.restoreState(memento, result);


        // Load the view layout recs
        IMemento[] recMementos = memento
                .getChildren(IWorkbenchConstants.TAG_VIEW_LAYOUT_REC);
        for (int i = 0; i < recMementos.length; i++) {
            IMemento recMemento = recMementos[i];
            String compoundId = recMemento
                    .getString(IWorkbenchConstants.TAG_ID);
            if (compoundId != null) {
                ViewLayoutRec rec = getViewLayoutRec(compoundId, true);
                if (IWorkbenchConstants.FALSE.equals(recMemento
                        .getString(IWorkbenchConstants.TAG_CLOSEABLE))) {
                    rec.isCloseable = false;
                }
                if (IWorkbenchConstants.FALSE.equals(recMemento
                        .getString(IWorkbenchConstants.TAG_MOVEABLE))) {
                    rec.isMoveable = false;
                }
                if (IWorkbenchConstants.TRUE.equals(recMemento
                        .getString(IWorkbenchConstants.TAG_STANDALONE))) {
                    rec.isStandalone = true;
                    rec.showTitle = !IWorkbenchConstants.FALSE
                            .equals(recMemento
                                    .getString(IWorkbenchConstants.TAG_SHOW_TITLE));
                }
            }
        }

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        // Save the version number.
        memento.putString(IWorkbenchConstants.TAG_VERSION, VERSION_STRING);
        result.add(p.saveState(memento));
        if (!saveInnerViewState) {
            Rectangle bounds = page.getWorkbenchWindow().getShell().getBounds();
            IMemento boundsMem = memento
                    .createChild(IWorkbenchConstants.TAG_WINDOW);
            boundsMem.putInteger(IWorkbenchConstants.TAG_X, bounds.x);
            boundsMem.putInteger(IWorkbenchConstants.TAG_Y, bounds.y);
            boundsMem.putInteger(IWorkbenchConstants.TAG_HEIGHT, bounds.height);
            boundsMem.putInteger(IWorkbenchConstants.TAG_WIDTH, bounds.width);
        }




        // Save the "always on" action sets.
        Iterator itr = alwaysOnActionSets.iterator();
        while (itr.hasNext()) {
            IActionSetDescriptor desc = (IActionSetDescriptor) itr.next();
            IMemento child = memento
                    .createChild(IWorkbenchConstants.TAG_ALWAYS_ON_ACTION_SET);
            child.putString(IWorkbenchConstants.TAG_ID, desc.getId());
        }


        // Save the "always off" action sets.
        itr = alwaysOffActionSets.iterator();
        while (itr.hasNext()) {
            IActionSetDescriptor desc = (IActionSetDescriptor) itr.next();
            IMemento child = memento
                    .createChild(IWorkbenchConstants.TAG_ALWAYS_OFF_ACTION_SET);
            child.putString(IWorkbenchConstants.TAG_ID, desc.getId());
        }


        // Save "show view actions"
        itr = showViewShortcuts.iterator();
        while (itr.hasNext()) {
            String str = (String) itr.next();
            IMemento child = memento
                    .createChild(IWorkbenchConstants.TAG_SHOW_VIEW_ACTION);
            child.putString(IWorkbenchConstants.TAG_ID, str);
        }


        // Save "show in times"
        itr = showInTimes.keySet().iterator();
        while (itr.hasNext()) {
            String id = (String) itr.next();
            Long time = (Long) showInTimes.get(id);
            IMemento child = memento
                    .createChild(IWorkbenchConstants.TAG_SHOW_IN_TIME);
            child.putString(IWorkbenchConstants.TAG_ID, id);
            child.putString(IWorkbenchConstants.TAG_TIME, time.toString());
        }


        // Save "new wizard actions".
        itr = newWizardShortcuts.iterator();
        while (itr.hasNext()) {
            String str = (String) itr.next();
            IMemento child = memento
                    .createChild(IWorkbenchConstants.TAG_NEW_WIZARD_ACTION);
            child.putString(IWorkbenchConstants.TAG_ID, str);
        }


        // Save "perspective actions".
        itr = perspectiveShortcuts.iterator();
        while (itr.hasNext()) {
            String str = (String) itr.next();
            IMemento child = memento
                    .createChild(IWorkbenchConstants.TAG_PERSPECTIVE_ACTION);
            child.putString(IWorkbenchConstants.TAG_ID, str);
        }


        // Get visible views.
        List viewPanes = new ArrayList(5);
        presentation.collectViewPanes(viewPanes);


        // Save the views.
        itr = viewPanes.iterator();
        int errors = 0;
        while (itr.hasNext()) {
            ViewPane pane = (ViewPane) itr.next();
            IViewReference ref = pane.getViewReference();
            IMemento viewMemento = memento
                    .createChild(IWorkbenchConstants.TAG_VIEW);
            viewMemento.putString(IWorkbenchConstants.TAG_ID, ViewFactory
                    .getKey(ref));
        }


        // save all fastview state
        if (fastViewManager != null)
          fastViewManager.saveState(memento);
      
        // Save the view layout recs.
        for (Iterator i = mapIDtoViewLayoutRec.keySet().iterator(); i.hasNext();) {
            String compoundId = (String) i.next();
            ViewLayoutRec rec = (ViewLayoutRec) mapIDtoViewLayoutRec
                    .get(compoundId);
            if (rec != null
                    && (!rec.isCloseable || !rec.isMoveable || rec.isStandalone)) {
                IMemento layoutMemento = memento
                        .createChild(IWorkbenchConstants.TAG_VIEW_LAYOUT_REC);
                layoutMemento.putString(IWorkbenchConstants.TAG_ID, compoundId);
                if (!rec.isCloseable) {
                    layoutMemento.putString(IWorkbenchConstants.TAG_CLOSEABLE,
                            IWorkbenchConstants.FALSE);
                }
                if (!rec.isMoveable) {
                    layoutMemento.putString(IWorkbenchConstants.TAG_MOVEABLE,
                            IWorkbenchConstants.FALSE);
                }
                if (rec.isStandalone) {
                    layoutMemento.putString(IWorkbenchConstants.TAG_STANDALONE,
                            IWorkbenchConstants.TRUE);
                    layoutMemento.putString(IWorkbenchConstants.TAG_SHOW_TITLE,
                            String.valueOf(rec.showTitle));
                }
            }
        }


        if (errors > 0) {
            String message = WorkbenchMessages.Perspective_multipleErrors;
            if (errors == 1) {
        message = WorkbenchMessages.Perspective_oneError;
      }
            MessageDialog.openError(null,
                    WorkbenchMessages.Error, message); 
        }


        // Save the layout.
        IMemento childMem = memento.createChild(IWorkbenchConstants.TAG_LAYOUT);
        result.add(presentation.saveState(childMem));


        // Save the editor visibility state
        if (isEditorAreaVisible()) {
      memento.putInteger(IWorkbenchConstants.TAG_AREA_VISIBLE, 1);

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    SafeRunner.run(new SafeRunnable(WorkbenchMessages.ErrorReadingState) {
      public void run() throws Exception {
        FileInputStream input = new FileInputStream(stateFile);
        BufferedReader reader = new BufferedReader(
            new InputStreamReader(input, "utf-8")); //$NON-NLS-1$
        IMemento memento = XMLMemento.createReadRoot(reader);


        // Validate known version format
        String version = memento
            .getString(IWorkbenchConstants.TAG_VERSION);
        boolean valid = false;
        for (int i = 0; i < VERSION_STRING.length; i++) {
          if (VERSION_STRING[i].equals(version)) {
            valid = true;

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      memento.putInteger(IWorkbenchConstants.TAG_PROGRESS_COUNT,
          progressCount);
    }


    // Save the advisor state.
    IMemento advisorState = memento
        .createChild(IWorkbenchConstants.TAG_WORKBENCH_ADVISOR);
    result.add(getAdvisor().saveState(advisorState));


    // Save the workbench windows.
    IWorkbenchWindow[] windows = getWorkbenchWindows();
    for (int nX = 0; nX < windows.length; nX++) {
      WorkbenchWindow window = (WorkbenchWindow) windows[nX];
      IMemento childMem = memento
          .createChild(IWorkbenchConstants.TAG_WINDOW);
      result.merge(window.saveState(childMem));
    }
    result.add(getEditorHistory().saveState(
        memento.createChild(IWorkbenchConstants.TAG_MRU_LIST)));

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  public final Object getAdapter(final Class key) {
    return serviceLocator.getService(key);
  }


  private void doRestoreState(final IMemento memento, final MultiStatus status) {
    IMemento childMem;
    try {
      UIStats.start(UIStats.RESTORE_WORKBENCH, "MRUList"); //$NON-NLS-1$
      IMemento mruMemento = memento
          .getChild(IWorkbenchConstants.TAG_MRU_LIST);
      if (mruMemento != null) {
        status.add(getEditorHistory().restoreState(mruMemento));
      }
    } finally {
      UIStats.end(UIStats.RESTORE_WORKBENCH, this, "MRUList"); //$NON-NLS-1$
    }


    // Restore advisor state.
    IMemento advisorState = memento
        .getChild(IWorkbenchConstants.TAG_WORKBENCH_ADVISOR);
    if (advisorState != null) {
      status.add(getAdvisor().restoreState(advisorState));
    }

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      return new ParameterizedCommand(command, null);
    }


    final Collection parameters = new ArrayList();
    for (int i = 0; i < parameterMementos.length; i++) {
      final IMemento parameterMemento = parameterMementos[i];


      // Read out the id.
      final String id = parameterMemento.getString(ATT_ID);
      if ((id == null) || (id.length() == 0)) {
        // The name should never be null. This is invalid.
        addWarning(warningsToLog, "Parameters need a name"); //$NON-NLS-1$
        continue;
      }


      // Find the parameter on the command.
      IParameter parameter = null;
      try {
        final IParameter[] commandParameters = command.getParameters();
        if (parameters != null) {
          for (int j = 0; j < commandParameters.length; j++) {
            final IParameter currentParameter = commandParameters[j];
            if (Util.equals(currentParameter.getId(), id)) {
              parameter = currentParameter;
              break;
            }
          }


        }
      } catch (final NotDefinedException e) {
        // This should not happen.
      }
      if (parameter == null) {
        // The name should never be null. This is invalid.
        addWarning(warningsToLog,
            "Could not find a matching parameter", id); //$NON-NLS-1$
        continue;
      }


      // Read out the value.
      final String value = parameterMemento.getString(ATT_VALUE);
      if ((value == null) || (value.length() == 0)) {
        // The name should never be null. This is invalid.
        addWarning(warningsToLog, "Parameters need a value", id); //$NON-NLS-1$
        continue;
      }

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                .createWriteRoot(IWorkbenchConstants.TAG_EDITORS);
        memento.putString(IWorkbenchConstants.TAG_VERSION, "3.1"); //$NON-NLS-1$
        FileEditorMapping maps[] = typeEditorMappings.userMappings();
        for (int mapsIndex = 0; mapsIndex < maps.length; mapsIndex++) {
            FileEditorMapping type = maps[mapsIndex];
            IMemento editorMemento = memento
                    .createChild(IWorkbenchConstants.TAG_INFO);
            editorMemento.putString(IWorkbenchConstants.TAG_NAME, type
                    .getName());
            editorMemento.putString(IWorkbenchConstants.TAG_EXTENSION, type
                    .getExtension());
            IEditorDescriptor[] editorArray = type.getEditors();
            for (int i = 0; i < editorArray.length; i++) {
                EditorDescriptor editor = (EditorDescriptor) editorArray[i];
                if (!editors.contains(editor)) {
                    editors.add(editor);
                }
                IMemento idMemento = editorMemento
                        .createChild(IWorkbenchConstants.TAG_EDITOR);
                idMemento.putString(IWorkbenchConstants.TAG_ID, editorArray[i]
                        .getId());
            }
            editorArray = type.getDeletedEditors();
            for (int i = 0; i < editorArray.length; i++) {
                EditorDescriptor editor = (EditorDescriptor) editorArray[i];
                if (!editors.contains(editor)) {
                    editors.add(editor);
                }
                IMemento idMemento = editorMemento
                        .createChild(IWorkbenchConstants.TAG_DELETED_EDITOR);
                idMemento.putString(IWorkbenchConstants.TAG_ID, editorArray[i]
                        .getId());
            }
            editorArray = type.getDeclaredDefaultEditors();
            for (int i = 0; i < editorArray.length; i++) {
                EditorDescriptor editor = (EditorDescriptor) editorArray[i];
                if (!editors.contains(editor)) {
                    editors.add(editor);
                }
                IMemento idMemento = editorMemento
                        .createChild(IWorkbenchConstants.TAG_DEFAULT_EDITOR);
                idMemento.putString(IWorkbenchConstants.TAG_ID, editorArray[i]
                        .getId());
            }
        }
        Writer writer = null;
        try {
            writer = new StringWriter();
            memento.save(writer);
            writer.close();
            store.setValue(IPreferenceConstants.RESOURCES, writer.toString());
        } catch (IOException e) {
            try {
                if (writer != null) {
          writer.close();
        }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            MessageDialog.openError((Shell) null, "Saving Problems", //$NON-NLS-1$
                    "Unable to save resource associations."); //$NON-NLS-1$
            return;
        }


        memento = XMLMemento.createWriteRoot(IWorkbenchConstants.TAG_EDITORS);
        Iterator itr = editors.iterator();
        while (itr.hasNext()) {
            EditorDescriptor editor = (EditorDescriptor) itr.next();
            IMemento editorMemento = memento
                    .createChild(IWorkbenchConstants.TAG_DESCRIPTOR);
            editor.saveValues(editorMemento);
        }
        writer = null;
        try {

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        int height = bigInt.intValue();


        bounds = new Rectangle(x, y, width, height);


        // Restore the placeholders.
        IMemento childrenMem[] = memento
                .getChildren(IWorkbenchConstants.TAG_VIEW);
        for (int i = 0; i < childrenMem.length; i++) {
            PartPlaceholder holder = new PartPlaceholder(childrenMem[i]
                    .getString(IWorkbenchConstants.TAG_ID));
            holder.setContainer(this);

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        memento.putInteger(IWorkbenchConstants.TAG_WIDTH, bounds.width);
        memento.putInteger(IWorkbenchConstants.TAG_HEIGHT, bounds.height);


        // Save the views.
        for (int i = 0; i < children.size(); i++) {
            IMemento childMem = memento
                    .createChild(IWorkbenchConstants.TAG_VIEW);
            LayoutPart child = (LayoutPart) children.get(i);
            childMem.putString(IWorkbenchConstants.TAG_ID, child.getID());
        }
    }

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