1namespace LiveBlog.Core
  2...{
  3  /**//// <summary>
  4  /// A generic collection with the ability to 
  5  /// check if it has been changed.
  6  /// </summary>
  7  [System.Serializable]
  8  public class StateList<T> : System.Collections.Generic.List<T>
  9  ...{
 10
 11    Base overrides#region Base overrides
 12
 13        /**////// <summary>
 14        ///// Inserts an element into the collection at the specified index and marks it changed.
 15        ///// </summary>
 16        //protected override void InsertItem(int index, T item)
 17        //{
 18        //  base.InsertItem(index, item);
 19        //  _IsChanged = true;
 20        //}
 21
 22        /**////// <summary>
 23        ///// Removes all the items in the collection and marks it changed.
 24        ///// </summary>
 25        //protected override void ClearItems()
 26        //{
 27        //  base.ClearItems();
 28        //  _IsChanged = true;
 29        //}
 30
 31        /**////// <summary>
 32        ///// Removes the element at the specified index and marks the collection changed.
 33        ///// </summary>
 34        //protected override void RemoveItem(int index)
 35        //{
 36        //  base.RemoveItem(index);
 37        //  _IsChanged = true;
 38        //}
 39
 40        /**////// <summary>
 41        ///// Replaces the element at the specified index and marks the collection changed.
 42        ///// </summary>
 43        //protected override void SetItem(int index, T item)
 44        //{
 45        //  base.SetItem(index, item);
 46        //  _IsChanged = true;
 47        //}
 48
 49        /**//// <summary>
 50        /// Serves as a hash function for a particular type. <see cref="M:System.Object.GetHashCode"></see> is suitable for use in hashing algorithms and data structures like a hash table.
 51        /// </summary>
 52        /// <returns>
 53        /// A hash code for the current <see cref="T:System.Object"></see>.
 54        /// </returns>
 55        public override int GetHashCode()
 56        ...{
 57            string hash = string.Empty;
 58            foreach (T item in this)
 59            ...{
 60                hash += item.GetHashCode().ToString();
 61            }
 62
 63            return hash.GetHashCode();
 64        }
 65
 66        /**//// <summary>
 67        /// Determines whether the specified <see cref="T:System.Object"></see> is equal to the current <see cref="T:System.Object"></see>.
 68        /// </summary>
 69        /// <param name="obj">The <see cref="T:System.Object"></see> to compare with the current <see cref="T:System.Object"></see>.</param>
 70        /// <returns>
 71        /// true if the specified <see cref="T:System.Object"></see> is equal to the current <see cref="T:System.Object"></see>; otherwise, false.
 72        /// </returns>
 73        public override bool Equals(object obj)
 74        ...{
 75            if (obj == null)
 76            ...{
 77                return false;
 78            }
 79
 80            if (obj.GetType() == this.GetType())
 81            ...{
 82                return obj.GetHashCode() == this.GetHashCode();
 83            }
 84
 85            return false;
 86        }
 87
 88    #endregion
 89
 90        private int _HasCode = 0;
 91
 92    /**//// <summary>
 93    /// Gets if this object's data has been changed.
 94    /// </summary>
 95    /// <returns>A value indicating if this object's data has been changed.</returns>
 96    public virtual bool IsChanged
 97    ...{
 98      get 
 99            ...{
100                return this.GetHashCode() != _HasCode;
101            }
102    }
103
104        /**//// <summary>
105        /// Marks the object as being clean, 
106        /// which means not changed.
107        /// </summary>
108        public virtual void MarkOld()
109        ...{
110            _HasCode = this.GetHashCode();
111            base.TrimExcess();
112        }
113
114  }
115}