1 /*

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

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    17 

    18 

    19 package com.ibm.oti.nokiaextcldc;

    20 

    21 import java.util.Hashtable;

    22 

    23 import com.ibm.oti.util.SystemPropertiesHook;

    24 import com.ibm.oti.vm.VM;

    25 

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

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

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

    29 

    30 /**

    31  * A class that implements a system property extension mechanism provided

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

    33  * properties in a Hashtable object as an argument in extendSystemProperties

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

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

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

    37  * dynamic properties.

    38  *

    39  * @author Nokia Corporation

    40  * @version 1.0

    41  */

    42 public class SystemPropertyExtension implements SystemPropertiesHook

    43 {

    44 

    45     public Hashtable extendSystemProperties(Hashtable originalProperties)

    46     {

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

    48         // the first class registering for finalization never receves

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

    50         // particular class will ever be finalized.

    51         VM.enableFinalization(Finalizer.class);

    52 

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

    54         // original properties.

    55         SystemPropertyHashtable newProperties =

    56             new SystemPropertyHashtable(originalProperties);

    57 

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

    59         JvmPort.setPropertiesContainer(newProperties);

    60 

    61         // Override existing line.separator

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

    63 

    64         return newProperties;

    65     }

    66 }