// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

package com.symbian.smt.gui;

import org.eclipse.core.runtime.preferences.IEclipsePreferences;

import org.osgi.service.prefs.BackingStoreException;

public class PersistentDataStore extends AbstractPersistentDataStore {

	private IEclipsePreferences node;

	private IEclipsePreferences defaultNode;

	public PersistentDataStore(IEclipsePreferences instanceNode) {

		this.node = instanceNode;

		this.defaultNode = null;

	}

	/**

	 * Creates the PersistentDataStore object, which is used for reading and

	 * writing to a IEclipsePreferences node

	 * 

	 * @param IEclipsePreferences

	 *            A node

	 */

	public PersistentDataStore(IEclipsePreferences instanceNode,

			IEclipsePreferences defaultNode) {

		this.node = instanceNode;

		this.defaultNode = defaultNode;

	}

	public String read(PersistentSettingsEnums key) {

		String result = node.get(key.toString(), null);

		if (result == null && defaultNode != null) {

			result = defaultNode.get(key.toString(), null);

		}

		return result;

	}

	public void write(PersistentSettingsEnums key, String value) {

		node.put(key.toString(), value);

		try {

			node.flush();

		} catch (BackingStoreException e) {

			Logger.log(e.getMessage(), e);

		}

	}

}