/*

* Copyright (c) 2009 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:

*

*/

using System;

using System.Xml;

using System.Text;

using System.IO;

using System.ComponentModel;

using System.Collections.Generic;

namespace SymbianUtils.Settings

{

    internal static class XmlSettingsValueConverter<T>

	{

        public static T Convert( XmlSettingsValue aValue, T aDefault )

        {

            bool defaultApplied = false;

            return Convert( aValue, aDefault, out defaultApplied );

        }

        public static T Convert( XmlSettingsValue aValue, T aDefault, out bool aDefaultApplied )

        {

            T ret = aDefault;

            aDefaultApplied = true;

            //

            Type srcType = aValue.Value.GetType();

            Type destType = aDefault.GetType();

            //

            try

            {

                // Don't need to convert if source and destination types are

                // identical.

                if ( srcType == destType )

                {

                    ret = (T) aValue.Value;

                }

                else

                {

                    // Don't try to convert empty strings.

                    if ( aValue.Value is string && destType != typeof( string ) )

                    {

                        string val = ( (string) aValue.Value ).Trim();

                        if ( val == string.Empty )

                        {

                            return aDefault;

                        }

                    }

                    // Try the type converter instead

                    TypeConverter converter = TypeDescriptor.GetConverter( destType );

                    if ( converter.CanConvertFrom( srcType ) )

                    {

                        if ( aValue.Value is string )

                        {

                            string text = (string) aValue.Value;

                            ret = (T) converter.ConvertFromInvariantString( text );

                        }

                        else

                        {

                            ret = (T) converter.ConvertFrom( aValue.Value );

                        }

                        aDefaultApplied = false;

                    }

                    else

                    {

                        SymbianUtils.SymDebug.SymDebugger.Break();

                    }

                }

            }

            catch ( System.FormatException )

            {

                SymbianUtils.SymDebug.SymDebugger.Break();

            }

            //

            return ret;

        }

	}

}