/*

* 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: RecordIdCache

*

*/

package com.nokia.mj.impl.rms;

import javax.microedition.rms.*;

/**

 * RecordIdCache saves all record id's in the store, which is used by

 * record enumerations.

 */

class RecordIdCache implements RecordListener

{

    private int[] iRecordIds;

    public RecordIdCache(Rms aRms)

    {

        iRecordIds = new int[0];

        // cache listener must be the first RecordListener registered

        // so that the other listeners get up-to-date information

        aRms.addRecordListener(this);

    }

    public int[] getRecordIds()

    {

        if (iRecordIds.length == 0)

        {

            return null;

        }

        return iRecordIds;

    }

    public void saveRecordIds(int[] aRecordIds)

    {

        if (aRecordIds == null)

        {

            iRecordIds = new int[0];

        }

        else

        {

            iRecordIds = aRecordIds;

        }

    }

    public void recordAdded(RecordStore aRecordStore, int aRecordId)

    {

        removeRecordId(aRecordId);

        insertRecordId(aRecordId);

    }

    public void recordChanged(RecordStore aRecordStore, int aRecordId)

    {

    }

    public void recordDeleted(RecordStore aRecordStore, int aRecordId)

    {

        removeRecordId(aRecordId);

    }

    private void removeRecordId(int aRecordId)

    {

        for (int i = 0; i < iRecordIds.length; i++)

        {

            if (aRecordId == iRecordIds[i])

            {

                int[] temp = new int[iRecordIds.length - 1];

                System.arraycopy(iRecordIds, 0, temp, 0, i);

                System.arraycopy(iRecordIds, i+1, temp, i, iRecordIds.length - i - 1);

                iRecordIds = temp;

            }

        }

    }

    private void insertRecordId(int aRecordId)

    {

        int[] temp = new int[iRecordIds.length + 1];

        iRecordIds = temp;

    }

}