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关系</summary>
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
    public class BindRelationAttribute : Attribute
    {
        #region 属性
        private String _Column;
        /// <summary>数据列</summary>
        public String Column
        {
            get { return _Column; }
            set { _Column = value; }
        }

        private String _RelationTable;
        /// <summary>引用表</summary>
        public String RelationTable
        {
            get { return _RelationTable; }
            set { _RelationTable = value; }
        }

        private String _RelationColumn;
        /// <summary>引用列</summary>
        public String RelationColumn
        {
            get { return _RelationColumn; }
            set { _RelationColumn = value; }
        }

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

        #region 构造
        /// <summary>指定一个关系</summary>
        /// <param name="column"></param>
        /// <param name="unique"></param>
        /// <param name="relationtable"></param>
        /// <param name="relationcolumn"></param>
        public BindRelationAttribute(String column, Boolean unique, String relationtable, String relationcolumn)
        {
            Column = column;
            Unique = unique;
            RelationTable = relationtable;
            RelationColumn = relationcolumn;
        }
        #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 BindRelationAttribute[] GetCustomAttributes(MemberInfo element)
        //{
        //    Attribute[] atts = GetCustomAttributes(element, typeof(BindRelationAttribute), true);
        //    if (atts == null || atts.Length < 1) return null;

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

        /// <summary>填充索引</summary>
        /// <param name="relation"></param>
        internal void Fill(IDataRelation relation)
        {
            relation.Column = Column;
            relation.Unique = Unique;
            relation.RelationTable = RelationTable;
            relation.RelationColumn = RelationColumn;
        }
        #endregion
    }
}