/*

* Copyright (c) 2010 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: RmsFileInfo

*

*/

package com.nokia.mj.impl.rms;

import javax.microedition.rms.*;

import com.nokia.mj.impl.fileutils.*;

import com.nokia.mj.impl.utils.*;

/**

 * RmsFileInfo provides file size related information.

 * Size information is cached for performance reasons and it can be

 * updated with separate command.

 */

class RmsFileInfo

{

    private FileUtility iFile;

    private long iFileSize;

    private long iAvailableSize;

    private boolean iDataInitialized;

    private static final long MAX_RMS_SIZE = 32000000; // MB

    public RmsFileInfo(String aFilename)

    {

        iFile = new FileUtility(aFilename);

        iDataInitialized = false;

    }

    public void refreshData()

    {

        iFileSize = getSize();

        iAvailableSize = getAvailableSize();

        iDataInitialized = true;

    }

    public long size()

    {

        ensureDataInitialized();

        return iFileSize;

    }

    public long availableSize()

    {

        ensureDataInitialized();

        return iAvailableSize;

    }

    private void ensureDataInitialized()

    {

        if (!iDataInitialized)

        {

            refreshData();

        }

    }

    private long getSize()

    {

        try

        {

            size = iFile.fileSize();

        }

        catch (Exception e)

        {

            Logger.ELOG(Logger.EMidpRms, "size() failed", e);

        }

        if (size < 0)

        {

            size = 0;

        }

        return size;

    }

    private long getAvailableSize()

    {

        long sizeLeft = MAX_RMS_SIZE - getSize();

        long result = 0;

        if (sizeLeft > 0)

        {

            long availableSize = getFreeSpace();

            result = Math.min(availableSize, sizeLeft);

        }

        return result;

    }

    private long getFreeSpace()

    {

        try

        {

            size = iFile.availableSize();

        }

        catch (Exception e)

        {

        }

        if (size < 0)

        {

        }

        return size;

    }

}