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

        super.restoreDialog(settings);


        final String setting = settings.get(WORKINGS_SET_SETTINGS);
        if (setting != null) {
            try {
                final IMemento memento = XMLMemento.createReadRoot(new StringReader(
                        setting));
                workingSetFilterActionGroup.restoreState(memento);
            } catch (final WorkbenchException e) {
                StatusManager.getManager().handle(
                        new Status(IStatus.ERROR, ErlideUIPlugin.PLUGIN_ID,

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    @Override
    public void saveState(final IMemento aMemento) {
        if (exprs.isEmpty()) {
            return;
        }
        final IMemento aMemento2 = aMemento.createChild("LiveExpressions");
        final Iterator<LiveExpr> iter = exprs.iterator();
        while (iter.hasNext()) {
            aMemento2.createChild("expression").putTextData(iter.next().toString());
        }
    }

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    public Integer getZoomLevel() {
        return zoomLevel;
    }
    
    public void save(boolean selectionAutomatic, int zoomLevel) {
        IMemento memento = (IMemento) blackboard.get(WMTLayerStyleContent.EXTENSION_ID);
        if(memento == null ){
            memento = XMLMemento.createWriteRoot("WMTLayer"); //$NON-NLS-1$
        }
        
        memento.putBoolean(WMTService.KEY_PROPERTY_ZOOM_LEVEL_SELECTION_AUTOMATIC, selectionAutomatic);
        memento.putInteger(WMTService.KEY_PROPERTY_ZOOM_LEVEL_VALUE, zoomLevel);


        blackboard.put(WMTLayerStyleContent.EXTENSION_ID, memento);
    }

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        blackboard.put(WMTLayerStyleContent.EXTENSION_ID, memento);
    }
    
    public boolean load() {
        IMemento memento = (IMemento) blackboard.get(WMTLayerStyleContent.EXTENSION_ID);
        if (memento != null) {
            Integer zoomLevelRaw = memento.getInteger(WMTService.KEY_PROPERTY_ZOOM_LEVEL_VALUE);
            Boolean selectionAutomaticRaw = memento
                    .getBoolean(WMTService.KEY_PROPERTY_ZOOM_LEVEL_SELECTION_AUTOMATIC);


            if ((zoomLevelRaw != null) && (selectionAutomaticRaw != null)) {
                zoomLevel = zoomLevelRaw;
                selectionAutomatic = selectionAutomaticRaw;

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        IMemento[] infos = memento.getChildren(IWorkbenchConstants.TAG_INFO);
        final Map mapIDtoPart = new HashMap(infos.length);


        for (int i = 0; i < infos.length; i++) {
            // Get the info details.
            IMemento childMem = infos[i];
            final String partID = childMem.getString(IWorkbenchConstants.TAG_PART);
            final String relativeID = childMem
                    .getString(IWorkbenchConstants.TAG_RELATIVE);
            int relationship = 0;
            int left = 0, right = 0;
            float ratio = 0.5f;
            if (relativeID != null) {
                relationship = childMem.getInteger(
                        IWorkbenchConstants.TAG_RELATIONSHIP).intValue();
                Float ratioFloat = childMem
                        .getFloat(IWorkbenchConstants.TAG_RATIO);
                Integer leftInt = childMem
                        .getInteger(IWorkbenchConstants.TAG_RATIO_LEFT);
                Integer rightInt = childMem
                        .getInteger(IWorkbenchConstants.TAG_RATIO_RIGHT);
                if (leftInt != null && rightInt != null) {
                    left = leftInt.intValue();
                    right = rightInt.intValue();
                } else if (ratioFloat != null) {
                    ratio = ratioFloat.floatValue();
                }
            }


            final EditorStack workbook [] = new EditorStack[1];
            StartupThreading.runWithoutExceptions(new StartupRunnable() {


        public void runWithException() throws Throwable {
          // Create the part.
                workbook[0] = EditorStack.newEditorWorkbook(EditorSashContainer.this, page);
                workbook[0].setID(partID);
                // 1FUN70C: ITPUI:WIN - Shouldn't set Container when not active
                workbook[0].setContainer(EditorSashContainer.this);
        }});
            


            IMemento workbookMemento = childMem
                    .getChild(IWorkbenchConstants.TAG_FOLDER);
            if (workbookMemento != null) {
                result.add(workbook[0].restoreState(workbookMemento));
            }

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            //    private LayoutPart part;
            //     private int relationship;
            //     private float ratio;
            //     private LayoutPart relative;
            RelationshipInfo info = relationships[i];
            IMemento childMem = memento
                    .createChild(IWorkbenchConstants.TAG_INFO);
            childMem.putString(IWorkbenchConstants.TAG_PART, info.part.getID());


            EditorStack stack = (EditorStack) info.part;
            if (stack != null) {
                IMemento folderMem = childMem
                        .createChild(IWorkbenchConstants.TAG_FOLDER);
                result.add(stack.saveState(folderMem));
            }


            if (info.relative != null) {

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     * @return the restoration status
     */
    public IStatus restorePresentationState(IMemento areaMem) {
        for (Iterator i = getEditorWorkbooks().iterator(); i.hasNext();) {
            final EditorStack workbook = (EditorStack) i.next();
            final IMemento memento = workbook.getSavedPresentationState();
            if (memento == null) {
        continue;
      }
            final PresentationSerializer serializer = new PresentationSerializer(
                    workbook.getPresentableParts());

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   * @since 3.2
   */
  private void saveWorkingSetState(IMemento memento, List list) {
    for (Iterator i = list.iterator(); i.hasNext();) {
            IPersistableElement persistable = (IWorkingSet) i.next();
            IMemento workingSetMemento = memento
                    .createChild(IWorkbenchConstants.TAG_WORKING_SET);
            workingSetMemento.putString(IWorkbenchConstants.TAG_FACTORY_ID,
                    persistable.getFactoryId());
            persistable.saveState(workingSetMemento);
        }
  }

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    protected void saveMruList(IMemento memento) {
        Iterator iterator = recentWorkingSets.iterator();


        while (iterator.hasNext()) {
            IWorkingSet workingSet = (IWorkingSet) iterator.next();
            IMemento mruMemento = memento
                    .createChild(IWorkbenchConstants.TAG_MRU_LIST);


            mruMemento.putString(IWorkbenchConstants.TAG_NAME, workingSet
                    .getName());
        }
    }

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     * Saves the state of this entry and its location.
     */
    void saveState(IMemento mem, ArrayList entries) {
        mem.putString(IWorkbenchConstants.TAG_HISTORY_LABEL, getHistoryText());
        if (locationMemento != null) {
            IMemento childMem = mem
                    .createChild(IWorkbenchConstants.TAG_POSITION);
            childMem.putMemento(locationMemento);
        } else if (location != null) {
            IMemento childMem = mem
                    .createChild(IWorkbenchConstants.TAG_POSITION);
            location.saveState(childMem);
        }
    }

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