using System;
using JD.Kernel.StaticHelpers;

namespace JD.PropertyService
{
    public class PropertyChangedEventArgs : EventArgs
    {
        #region Variables

        private readonly IProperties m_properties;
        private readonly string m_propertyName;
        private readonly object m_oldValue;
        private readonly object m_newValue;

        #endregion

        #region Constructor

        public PropertyChangedEventArgs(IProperties properties, string propertyName, object oldValue, object newValue)
        {
            Throw.IfNull(properties, "properties");

            m_properties = properties;
            m_propertyName = propertyName;
            m_oldValue = oldValue;
            m_newValue = newValue;
        }

        #endregion

        #region Properties

        public IProperties Properties
        {
            get { return m_properties; }
        }

        public string PropertyName
        {
            get { return m_propertyName; }
        }

        public object OldValue
        {
            get { return m_oldValue; }
        }

        public object NewValue
        {
            get { return m_newValue; }
        }

        #endregion
    }
}