using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Core.Mes.Client.Comm.Tool
{
    /// <summary>
    /// 数据源集合，用来判断数据是否发生修改。
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class DataSourceList<T> : List<T>
    {
        private Dictionary<T, T> _queryDic = new Dictionary<T, T>();

        public Dictionary<T, T> QueryDic
        {
            get { return _queryDic; }
            set { _queryDic = value; }
        }

        private bool _isChanged = false;

        public bool IsChanged
        {
            get { return _isChanged; }
            set { _isChanged = value; }
        }

        /// <summary>
        /// 提交更改
        /// </summary>
        public void AcceptChanges()
        {
            _queryDic.Clear();
            _isChanged = false;
            foreach(T obj in this)
            {
                T obj2 = EntityHelper.CopyEntity<T>(obj);
                _queryDic.Add(obj, obj2);
            }
        }

        /// <summary>
        /// 数据发生更改时调用该方法。
        /// </summary>
        /// <param name="obj"></param>
        public void Change(T obj)
        {
            if (_queryDic.ContainsKey(obj))
            {
                _isChanged = !EntityHelper.Compare<T>(
                    obj, _queryDic[obj]);
            }
            else
            {
                _isChanged = true;
            }
        }
    }
}