/*

* 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.j9;

import java.io.InputStream;

import java.io.IOException;

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

import com.ibm.oti.vm.VM;

import com.ibm.oti.vm.OSMemoryAccessor;

/**

 *

 * @author Nokia Corporation

 * @version 1.0

 */

class NativeMemoryBlockImpl implements NativeMemoryBlock

{

    /**

     * Default constructor not allowed

     */

    private NativeMemoryBlockImpl()

    {

    }

    /**

     * ctor

     */

    NativeMemoryBlockImpl(String jarPath, String resName)

    {

        mMemInputStream = VM.getResourceAsMemInputStream(jarPath, resName);

    }

    /**

     * Get the pointer to the native memory.

     */

    public long getPointer()

    {

        if (mMemInputStream != null)

        {

            return ((OSMemoryAccessor)mMemInputStream).getPointer();

        }

        return 0;

    }

    /**

     * Get the size of the allocated native memory.

     */

    public int getSize()

    {

        if (mMemInputStream != null)

        {

            return ((OSMemoryAccessor)mMemInputStream).getSize();

        }

        return 0;

    }

    /**

     * Frees the native memory.

     */

    public void freeMemory()

    {

        if (mMemInputStream != null)

        {

            try

            {

                mMemInputStream.close();

            }

            catch (IOException ioe)

            {

                // Should write a log or silently discard?

            }

        }

    }

}