/*******************************************************************************
 * Copyright (c) 2003, 2006 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.ui.navigator;

import org.eclipse.ui.IMemento;

/**
 * Clients may use mementos to persist interesting state between sessions.
 * Clients should ensure that the memento keys are unique; generally by using
 * the id of the content extension as a prefix.
 * 
 * <p>
 * Clients may implement this interface.
 * </p>
 * 
 * @since 3.2
 * 
 */
public interface IMementoAware {

	/**
	 * <p>
	 * Restore the previous state of any actions using the flags in aMemento.
	 * This method allows the state of any actions that persist from session to
	 * session to be restored.
	 * </p>
	 * 
	 * @param aMemento
	 *            A memento that was given to the view part to restore its
	 *            state.
	 */
	public void restoreState(IMemento aMemento);

	/**
	 * <p>
	 * Save flags in aMemento to remember the state of any actions that persist
	 * from session to session.
	 * </p>
	 * <p>
	 * Extensions should qualify any keys stored in the memento with their
	 * plugin id
	 * </p>
	 * 
	 * @param aMemento
	 *            A memento that was given to the view part to save its state.
	 */
	public void saveState(IMemento aMemento);

}