/*

* Copyright (c) 2002-2007 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:  Item for VideoControl.

*

*/

package com.nokia.microedition.media.control;

public class VolumeControl extends ControlImpl

        implements javax.microedition.media.control.VolumeControl

{

    private static final int MAX_VOLUME = 100;

    private static final int UNDEFINED_VOLUME = -1;

    // these constants come from native side

    protected static final int NO_ERROR = 0; // native side returns if OK

    private int iLevel;

    private boolean iMuted;

    public VolumeControl()

    {

        iLevel = UNDEFINED_VOLUME;

    }

    public boolean isMuted()

    {

        checkState();

        return iMuted;

    }

    public int getLevel()

    {

        checkState();

        // If the control is muted the cached volume level is returned

        // because the native implemnetation doesn't directly support

        // muting. The mute is applied by setting volume level to zero

        if (!iMuted)

        {

            int level = _getLevel(iEventSource, iControlHandle);

            if (level < NO_ERROR)

            {

                throw new Error("getLevel() failed, Symbian OS error: " + level);

            }

            // Cache the returned volume level due to mute handling

            iLevel = level;

        }

        return iLevel;

    }

    public int setLevel(int aLevel)

    {

        checkState();

        int level = aLevel;

        if (level < 0)

        {

            level = 0;

        }

        else if (level > MAX_VOLUME)

        {

            level = MAX_VOLUME;

        }

        if (!iMuted)

        {

            int error = _setLevel(iEventSource, iControlHandle, level);

            if (error < NO_ERROR)

            {

                throw new Error("setLevel() failed, Symbian OS error: " + error);

            }

        }

        iLevel = level;

        return level;

    }

    public void setMute(boolean aMuted)

    {

        checkState();

        if (aMuted != iMuted)

        {

            if (iLevel == UNDEFINED_VOLUME)

            {

                getLevel();

            }

            iMuted = aMuted;

            int level = 0;

            if (!iMuted)

            {

                level = iLevel;

            }

            // else level is 0

            int error = _setLevel(iEventSource, iControlHandle, level);

            if (error < NO_ERROR)

            {

                throw new Error("setMute() failed, Symbian OS error: " + error);

            }

        }

    }

    private static native int _setLevel(int aEventSource, int aControlHandle,

                                        int aLevel);

    private static native int _getLevel(int aEventSource, int aControlHandle);

}