/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:  Holds property values.

*

*

*/

#ifndef WIDGETPROPERTYVALUE_H

#define WIDGETPROPERTYVALUE_H

#include <e32base.h>

#include <s32strm.h>

#include "WidgetRegistryConstants.h"

// serialize length = header + value

const TInt32 KWidgetPropertyValSerializeMaxLength = 32 + KWidgetRegistryVal;

enum TWidgetPropertyType

    {

    EWidgetPropTypeUnknown = 0,

    EWidgetPropTypeBool,

    EWidgetPropTypeInt,

    EWidgetPropTypeString,

    EWidgetPropTypeUid,

    EWidgetPropTypeBlob

    };

/**

*  CWidgetData

*  @since 3.1

*/

class CWidgetPropertyValue : public CBase

    {

public:

    /**

     * Two phase constructor

     * @return none

     * @since 3.1

     **/

    static CWidgetPropertyValue* NewL()

        {

        CWidgetPropertyValue *self = new ( ELeave ) CWidgetPropertyValue();

        CleanupStack::PushL( self );

        self->ConstructL();

        CleanupStack::Pop();

        return self;

        }

    /**

     * Destructor

     * @return none

     * @since 3.1

     **/

    ~CWidgetPropertyValue()

        {

        if ( EWidgetPropTypeString == iType )

            {

            delete iValue.s;

            }

        }

    operator TInt() const

        {

        if ( EWidgetPropTypeInt == iType )

            {

            return iValue.i;

            }

        return 0;

        }

    operator const TDesC&()

        {

        if ( EWidgetPropTypeString == iType )

            {

            return *iValue.s;

            }

        return KNullDesC;

        }

    operator const TUid&()

        {

        if ( EWidgetPropTypeUid == iType )

            {

            return iValue.uid;

            }

        return KNullUid;

        }

    CWidgetPropertyValue& operator= (TInt i)

        {

        iValue.i = i;

        iType = EWidgetPropTypeInt;

        return *this;

        }

    CWidgetPropertyValue& operator= (const TDesC& s)

        {

        // self-assignment check

        if ( iValue.s != &s )

            {

            delete iValue.s;

            iValue.s = s.AllocL();

            iType = EWidgetPropTypeString;

            }

            return *this;

        }

    CWidgetPropertyValue& operator= (TUid uid)

        {

        iValue.uid = uid;

        iType = EWidgetPropTypeUid;

        return *this;

        }

    void Reset()

        {

        if ( EWidgetPropTypeString == iType )

            {

            delete iValue.s;

            iValue.s = NULL;

            }

        iType = EWidgetPropTypeUnknown;

        }

    void SerializeL( RWriteStream& aStream ) const

        {

        switch ( iType )

            {

        case EWidgetPropTypeUnknown:

            aStream.WriteInt32L( 7 );

            aStream.WriteL( _L("unknown"), 7 );

            break;

        case EWidgetPropTypeBool:

            aStream.WriteInt32L( 4 );

            aStream.WriteL( _L("bool"), 4 );

            aStream.WriteInt32L( iValue.i );

            break;

        case EWidgetPropTypeInt:

            aStream.WriteInt32L( 3 );

            aStream.WriteL( _L("int"), 3 );

            aStream.WriteInt32L( iValue.i );

            break;

        case EWidgetPropTypeString:

            aStream.WriteInt32L( 3 );

            aStream.WriteL( _L("str"), 3 );

            aStream.WriteInt32L( iValue.s->Length() );

            aStream.WriteL( *(iValue.s), iValue.s->Length() );

            break;

        case EWidgetPropTypeUid:

            aStream.WriteInt32L( 3 );

            aStream.WriteL( _L("uid"), 3 );

            aStream.WriteInt32L( iValue.uid.iUid );

            break;

        default:

            User::Leave( KErrCorrupt );

            }

        }

    void DeserializeL( RReadStream& aStream )

        {

        Reset();

        TInt x = 0;

        TInt len = aStream.ReadInt32L();

        if ( len > KMaxFileName )

            {

            User::Leave( KErrCorrupt );

            }

        TFileName buf;

        aStream.ReadL( buf, len );

        if ( 0 == buf.Compare( _L("unknown") ) )

            {

            iType = EWidgetPropTypeUnknown;

            iValue.i = 0;

            }

        else if ( 0 == buf.Compare( _L("bool") ) )

            {

            iType = EWidgetPropTypeBool;

            iValue.i = aStream.ReadInt32L();

            }

        else if ( 0 == buf.Compare( _L("int") ) )

            {

            iType = EWidgetPropTypeInt;

            iValue.i = aStream.ReadInt32L();

            }

        else if ( 0 == buf.Compare( _L("str") ) )

            {

            iType = EWidgetPropTypeString;

            len = aStream.ReadInt32L();

            if ( len <= KMaxFileName )

                {

                HBufC* vBuf = HBufC::NewLC( len );

                TPtr16 p = vBuf->Des();

                aStream.ReadL( p, len );

                iValue.s = vBuf;

                CleanupStack::Pop(); // vBuf

                }

            else

                {

                User::Leave( KErrCorrupt );

                }

            }

        else if ( 0 == buf.Compare( _L("uid") ) )

            {

            iType = EWidgetPropTypeUid;

            TUid uid = TUid::Uid( aStream.ReadInt32L() );

            iValue.uid = uid;

            }

        else

            {

            User::Leave( KErrCorrupt );

            }

        }

protected:

    /**

     * Constructor

     */

    CWidgetPropertyValue() {}

    /**

     * 2-phase constructor

     */

    void ConstructL() {}

private:

    // no copy constructor

    CWidgetPropertyValue( const CWidgetPropertyValue& );

    // no assignment

    CWidgetPropertyValue& operator=( const CWidgetPropertyValue& );

public:

    TWidgetPropertyType iType;

    union

        {

        TInt i;

        HBufC* s;

        TUid uid;

        } iValue;

    };

// RPointerArray<CWidgetPropertyValue>  RWidgetPropertyValues(EWidgetPropertyIdCount)

// and use is ended by ResetAndDestroy()

#endif // WIDGETPROPERTYVALUE_H