using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using XCode.DataAccessLayer;

namespace XCode
{
    /// <summary>用于指定数据类所绑定到的索引</summary>
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
    public class BindIndexAttribute : Attribute
    {
        #region 属性
        private String _Name;
        /// <summary>名称</summary>
        public String Name
        {
            get { return _Name; }
            set { _Name = value; }
        }

        private Boolean _Unique;
        /// <summary>是否唯一</summary>
        public Boolean Unique
        {
            get { return _Unique; }
            set { _Unique = value; }
        }

        private String _Columns;
        /// <summary>数据列集合</summary>
        public String Columns
        {
            get { return _Columns; }
            set { _Columns = value; }
        }
        #endregion

        #region 构造
        /// <summary>指定一个索引</summary>
        /// <param name="name"></param>
        /// <param name="unique"></param>
        /// <param name="columns"></param>
        public BindIndexAttribute(String name, Boolean unique, String columns)
        {
            Name = name;
            Unique = unique;
            Columns = columns;
        }
        #endregion

        #region 方法
        ///// <summary>
        ///// 检索应用于类型成员的自定义属性。
        ///// </summary>
        ///// <param name="element"></param>
        ///// <returns></returns>
        //public new static BindIndexAttribute[] GetCustomAttributes(MemberInfo element)
        //{
        //    Attribute[] atts = GetCustomAttributes(element, typeof(BindIndexAttribute), true);
        //    if (atts == null || atts.Length < 1) return null;

        //    List<BindIndexAttribute> list = new List<BindIndexAttribute>();
        //    foreach (Attribute item in atts)
        //    {
        //        list.Add(item as BindIndexAttribute);
        //    }
        //    return list.ToArray();
        //}

        /// <summary>填充索引</summary>
        /// <param name="index"></param>
        internal void Fill(IDataIndex index)
        {
            if (!String.IsNullOrEmpty(Name)) index.Name = Name;
            index.Unique = Unique;
            if (!String.IsNullOrEmpty(Columns))
            {
                String[] ss = Columns.Split(new Char[] { ',', ';' }, StringSplitOptions.RemoveEmptyEntries);
                List<String> list = new List<string>();
                foreach (String item in ss)
                {
                    String column = item.Trim();
                    if (!String.IsNullOrEmpty(column)) list.Add(column);
                }
                index.Columns = list.ToArray();
            }
        }
        #endregion
    }
}