javacommons/utils/javasrc/com/ibm/oti/nokiaextcldc/SystemPropertyExtension.java
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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package com.ibm.oti.nokiaextcldc;
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import java.util.Hashtable;
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import com.ibm.oti.util.SystemPropertiesHook;
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import com.ibm.oti.vm.VM;
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import com.nokia.mj.impl.rt.SystemPropertyHashtable;
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import com.nokia.mj.impl.rt.support.Finalizer;
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import com.nokia.mj.impl.rt.JvmPort;
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import com.nokia.mj.impl.utils.Logger;
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/**
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 * A class that implements a system property extension mechanism provided
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 * by J9 for CLDC. The idea is that the VM provides the original system
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 * properties in a Hashtable object as an argument in extendSystemProperties
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 * method. In the method a new Hashtable based instance of object is returned
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 * containing original properties. The object is from class that extendeds
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 * the Hashtable where the get() method is overwritten in order to handle
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 * dynamic properties.
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 *
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 * @author Nokia Corporation
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 * @version 1.0
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 */
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public class SystemPropertyExtension implements SystemPropertiesHook
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{
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    public Hashtable extendSystemProperties(Hashtable originalProperties)
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    {
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        try
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        {
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            // Vital to make finalizer implementation reliable. If this is not
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            // done the first class registering for finalization never receves
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            // finalization serverces - i.e. none of the instances of that
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            // particular class will ever be finalized.
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            VM.enableFinalization(Finalizer.class);
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            // Create a new object extending java.util.Hashtable and fill with
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            // the original properties.
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            SystemPropertyHashtable newProperties = 
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                new SystemPropertyHashtable(originalProperties);
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            // Store the hashtable to be able to add properties during runtime.
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            JvmPort.setPropertiesContainer(newProperties);
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            // Override existing line.separator
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            newProperties.put("line.separator", "\n");
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            return newProperties;
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        }
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        catch (Throwable t)
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        {
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            Logger.LOG(Logger.EUtils, Logger.EInfo, 
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               "Failed to init system properties", t);
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            // In case of error, return original properties.
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        }
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        return originalProperties;
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    }
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}