// /**
//  * File: DiskObject.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.IO;
namespace ln.types.serialize
{
    public class DiskObject<T>
    {
        public String FileName { get; private set; }

        public T Instance { get; set; }

        public DiskObject(string fileName)
        {
            FileName = fileName;
            Load();
        }
        public DiskObject(string fileName,T instance)
            :this(fileName)
        {
            Instance = instance;
        }

        public void Load()
        {
            if (File.Exists(FileName))
            {
                using (FileStream fileStream = new FileStream(FileName, FileMode.Open))
                {
                    ObjectReader objectReader = new ObjectReader(fileStream);
                    Instance = (T)objectReader.Read();
                    fileStream.Close();
                }
            }
            else
            {
                Instance = Activator.CreateInstance<T>();
            }
        }
        public void Save()
        {
            lock (this)
            {
                String tmpFileName = string.Format("{0}.tmp", FileName);

                using (FileStream fileStream = new FileStream(tmpFileName, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    ObjectWriter objectWriter = new ObjectWriter(fileStream);
                    objectWriter.Write(Instance);
                    fileStream.Close();
                }

                if (!File.Exists(FileName))
                    File.Move(tmpFileName, FileName);
                else
                    File.Replace(tmpFileName, FileName, FileName + ".old");
            }
        }

    }
}