/*

* 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.ibm.oti.nokiaextcldc;

import java.util.Hashtable;

import com.ibm.oti.util.SystemPropertiesHook;

import com.ibm.oti.vm.VM;

import com.nokia.mj.impl.rt.SystemPropertyHashtable;

import com.nokia.mj.impl.rt.support.Finalizer;

import com.nokia.mj.impl.rt.JvmPort;

/**

 * A class that implements a system property extension mechanism provided

 * by J9 for CLDC. The idea is that the VM provides the original system

 * properties in a Hashtable object as an argument in extendSystemProperties

 * method. In the method a new Hashtable based instance of object is returned

 * containing original properties. The object is from class that extendeds

 * the Hashtable where the get() method is overwritten in order to handle

 * dynamic properties.

 *

 * @author Nokia Corporation

 * @version 1.0

 */

public class SystemPropertyExtension implements SystemPropertiesHook

{

    public Hashtable extendSystemProperties(Hashtable originalProperties)

    {

        // Vital to make finalizer implementation reliable. If this is not done

        // the first class registering for finalization never receves

        // finalization serverces - i.e. none of the instances of that

        // particular class will ever be finalized.

        VM.enableFinalization(Finalizer.class);

        // Create a new object extending java.util.Hashtable and fill with the

        // original properties.

        SystemPropertyHashtable newProperties =

            new SystemPropertyHashtable(originalProperties);

        // Store the hashtable to be able to add properties during runtime.

        JvmPort.setPropertiesContainer(newProperties);

        // Override existing line.separator

        newProperties.put("line.separator", "\n");

        return newProperties;

    }

}