using System;
using System.Reflection;

namespace Zhaizj.Framework.ORM {

    /// <summary>
    /// 检查对象属性是否已经赋值，如果是字符串类型，empty的字符串也是不合法的
    /// </summary>
    [Serializable]
    public class NotNullAttribute : ValidationAttribute {

        public NotNullAttribute() {
        }

        public NotNullAttribute( String msg ) {
            base.Message = msg;
        }

        public override void Validate( String action, IEntity target, EntityPropertyInfo info, Result result ) {
            Object obj = target.get( info.Name );

            Boolean isNull = false;
            if (info.Type == typeof( String )) {
                if (obj == null) {
                    isNull = true;
                }
                else if (strUtil.IsNullOrEmpty( obj.ToString() )) {
                    isNull = true;
                }
            }
            else if (obj == null) {
                isNull = true;
            }

            if (isNull) {
                if (strUtil.HasText( this.Message )) {
                    result.Add( this.Message );
                }
                else {
                    EntityInfo ei = Entity.GetInfo( target );
                    String str = "[" + ei.FullName + "] : property \"" + info.Name + "\" ";
                    result.Add( str + "can not be null" );
                }
            }
        }

    }
}