Examples of org.eclipse.ui.IPersistableElement

org.eclipse.ui.IPersistableElement
Interface for asking an object to store its state in a memento.
This interface is typically included in interfaces where persistance is required.
When the workbench is shutdown objects which implement this interface will be persisted. At this time the getFactoryId method is invoked to discover the id of the element factory that will be used to re-create the object from a memento. Then the saveState method is invoked to store the element data into a newly created memento. The resulting mementos are collected up and written out to a single file.

During workbench startup these mementos are read from the file. The factory Id for each is retrieved and mapped to an IElementFactory which has been registered in the element factory extension point. If a factory exists for the Id it will be engaged to re-create the original object.
@see org.eclipse.core.runtime.IAdaptable @see org.eclipse.ui.IMemento @see org.eclipse.ui.IElementFactory


    boolean restore = preferences.getBoolean(DefaultPreferences.REOPEN_BROWSER_TABS);
    if (!restore)
      return null;


    return new IPersistableElement() {
      public String getFactoryId() {
        return FACTORY_ID;
      }


      public void saveState(IMemento memento) {

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  public IPersistableElement getPersistable() {
    boolean restore = Platform.getPreferencesService().getBoolean(RESTORE_QUALIFIER, RESTORE_KEY, true, null);
    if (!restore)
      return null;


    return new IPersistableElement() {
      public String getFactoryId() {
        return FACTORY_ID;
      }


      public void saveState(IMemento memento) {

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  public IPersistableElement getPersistable() {
    boolean restore = Platform.getPreferencesService().getBoolean(RESTORE_QUALIFIER, RESTORE_KEY, true, null);
    if (!restore)
      return null;


    return new IPersistableElement() {
      public String getFactoryId() {
        return FACTORY_ID;
      }


      public void saveState(IMemento memento) {

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        //write the information needed to recreate the editor input
        if (editorInputData.input != null) {
            // Capture the editor information
            XMLMemento memento = XMLMemento.createWriteRoot("IEditorInput");//$NON-NLS-1$


            IPersistableElement element = editorInputData.input
                    .getPersistable();
            if (element != null) {
                //get the IEditorInput to save its state
                element.saveState(memento);


                //convert memento to String
                StringWriter writer = new StringWriter();
                memento.save(writer);
                writer.close();


                //write the factor ID and state information
                dataOut.writeUTF(element.getFactoryId());
                dataOut.writeUTF(writer.toString());
            }
        }
    }

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   * @param list the working sets to save
   * @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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        this.memento = memento;
    }


    boolean isPersistable() {
        if (editorInput != null) {
            IPersistableElement persistable = editorInput.getPersistable();
            return persistable != null;
        }
        return memento != null;
    }

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    void handlePartClosed() {
        if (!isPersistable()) {
      return;
    }
        if (memento == null) {
            IPersistableElement persistable = editorInput.getPersistable();
            memento = XMLMemento
                    .createWriteRoot(IWorkbenchConstants.TAG_EDITOR);
            memento.putString(IWorkbenchConstants.TAG_ID, editorID);
            memento.putString(IWorkbenchConstants.TAG_FACTORY_ID, persistable
                    .getFactoryId());
            persistable.saveState(memento);
        }
        editorID = null;
        editorInput = null;
    }

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        memento = null;
    }


    void saveState(IMemento mem) {
        if (editorInput != null) {
            IPersistableElement persistable = editorInput.getPersistable();
            mem.putString(IWorkbenchConstants.TAG_ID, editorID);
            mem.putString(IWorkbenchConstants.TAG_FACTORY_ID, persistable
                    .getFactoryId());
            persistable.saveState(mem);
        } else if (memento != null) {
            mem.putMemento(memento);
        }
    }

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    }
    
    public String getFactoryId() {
        IEditorPart editor = getEditor(false);
        if (editor != null) {
            IPersistableElement persistable = editor.getEditorInput()
                    .getPersistable();
            if (persistable != null) {
        return persistable.getFactoryId();
      }
            return null;
        }
        return factoryId;
    }

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      memento.putString(IWorkbenchConstants.TAG_LABEL, getLabel());
      memento.putString(IWorkbenchConstants.TAG_EDIT_PAGE_ID, editPageId);
      Iterator iterator = elements.iterator();
      while (iterator.hasNext()) {
        IAdaptable adaptable = (IAdaptable) iterator.next();
        IPersistableElement persistable = (IPersistableElement) Util
            .getAdapter(adaptable, IPersistableElement.class);
        if (persistable != null) {
          IMemento itemMemento = memento
              .createChild(IWorkbenchConstants.TAG_ITEM);


          itemMemento.putString(IWorkbenchConstants.TAG_FACTORY_ID,
              persistable.getFactoryId());
          persistable.saveState(itemMemento);
        }
      }
    }
  }

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