content: /*******************************************************************************
   * Copyright (c) 2000, 2007 IBM Corporation and others.
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.workingsets;
  
  import org.eclipse.core.runtime.IAdaptable;
  import org.eclipse.ui.IElementFactory;
  import org.eclipse.ui.IMemento;
  import org.eclipse.ui.IPersistableElement;
  import org.eclipse.ui.PlatformUI;
  
  public class Mementos {
  
      public static final String TAG_FACTORY_ID = "factoryID"; //$NON-NLS-1$
      public static final String TAG_ITEM = "item"; //$NON-NLS-1$			
  	
      public static void saveItem(IMemento memento, IAdaptable element) {
          IPersistableElement persistable= (IPersistableElement)element.getAdapter(IPersistableElement.class);
          if (persistable != null) {
              memento.putString(
              	TAG_FACTORY_ID,
                  persistable.getFactoryId());
              persistable.saveState(memento);
          }
      	
      }
      
  	public static IAdaptable restoreItem(IMemento memento) {
  		return restoreItem(memento, TAG_FACTORY_ID);
  	}
  	
  	public static IAdaptable restoreItem(IMemento memento, String factoryTag) {
  		if (memento == null)
  			return null;
  	    String factoryID = memento.getString(factoryTag);
  	    if (factoryID == null) return null;
  	    IElementFactory factory = PlatformUI.getWorkbench().getElementFactory(factoryID);
  	    if (factory == null) return null;
  	    return factory.createElement(memento);
  	}
  }
  