/*

* Copyright (c) 2008 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.nokia.mj.impl.rt;

import java.util.Enumeration;

import java.util.Hashtable;

/**

 * A class that will be used to store system properties in CLDC VM.

 * The class is inherited from java.util.Hashtable and the VM will replace

 * the original Hashtable object with instace of this object which gives

 * us the control when application is asking for any system property.

 *

 * @author Nokia Corporation

 * @version 1.0

 */

public class SystemPropertyHashtable extends Hashtable implements DynamicProperty

{

    /** Storage place for user defined properties. */

    private Hashtable mUserProperties = new Hashtable(); 

    public SystemPropertyHashtable(Hashtable originalProperties)

    {

        // Store the original properties

        Enumeration keys = originalProperties.keys();

        while (keys.hasMoreElements())

        {

            Object key = keys.nextElement();

            Object value = originalProperties.get(key);

            super.put(key, value);

        }

    }

    /**

     * Gets the system property indicated by the specified key. This overrides

     * get() method from java.util.Hashtable.

     * @param name the name of the system property.

     * @return string value of the system property, or null if there is no

     *         property with that key.

     */

    public Object get(Object name)

    {

        Object val = super.get(name);

        if (val != null)

        {

            return SystemPropertyUtils.solvePropertyValue(name, val,this);

        }

        return mUserProperties.get(name);

    }

    /**

     * Adds the defined system property to Hashtable containing all the system

     * properties.

     */

    public Object setSystemProperty(Object key, Object value)

    {

        return super.put(key, value);

    }

    /**

     * Adds the defined system property to Hashtable containing all the user

     * properties.

     */

    public Object setUserProperty(Object key, Object value)

    {

        return mUserProperties.put(key, value);

    }

}