Signum Framework Principles

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Signum.Entities;
using System.Collections.ObjectModel;
using Signum.Utilities;
using Signum.Utilities.ExpressionTrees;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics; 

namespace Signum.Entities
{
    [Serializable, DebuggerTypeProxy(typeof(MListDebugging<>)), DebuggerDisplay("Count = {Count}")]
    public class MList<T> : Modifiable, IList<T>, IList, INotifyCollectionChanged, INotifyPropertyChanged 
    {
        int _hastCode = 0;
        List<T> lista = new List<T>();

        #region Eventos


        [field: NonSerialized]
        public event PropertyChangedEventHandler PropertyChanged;

        [field:NonSerialized]
        public event NotifyCollectionChangedEventHandler CollectionChanged;

        protected virtual void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
        {
            switch (e.Action)
            {
                case NotifyCollectionChangedAction.Move:
                case NotifyCollectionChangedAction.Replace:
                    OnPropertyChanged("Item[]");
                    break;
                case NotifyCollectionChangedAction.Add:
                case NotifyCollectionChangedAction.Remove:
                case NotifyCollectionChangedAction.Reset:
                    OnPropertyChanged("Count");
                    OnPropertyChanged("Item[]");
                    break;
                default:
                    break;
            }

            if (this.CollectionChanged != null)
            {
                this.CollectionChanged(this, e);
            }

        }

        protected virtual void OnPropertyChanged(string propertyName)
        {
           if(PropertyChanged!= null)
               PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
        }

        #endregion

        public override bool SelfModified
        {
            get
            {
                return _hastCode != GetHashCode();
            }
            internal set
            {
                if (value == false)
                {
                    _hastCode = GetHashCode();
                }
            }
        }

        public override int GetHashCode()
        {
            long hash = 0;
            foreach (var item in lista)
            {
                hash += item.GetHashCode();
            }
            return hash.GetHashCode();
        }

        public MList()
        {
            lista = new List<T>();
        }

        public MList(IEnumerable<T> collection)
        {
            lista = new List<T>(collection);
        }

        public MList(int capacity)
        {
            lista = new List<T>(capacity);
        }

        public int Count
        {
            get { return lista.Count; }
        }

        public T this[int index]
        {
            get { return lista[index]; }
            set
            {
                T old = lista[index];
                lista[index] = value;
                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, value, old));
            }
        }

        public void Add(T item)
        {
            lista.Add(item);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item));
        }

        public void Add(params T[] items)
        {
            AddRange(items);
        }

        public void Add(IEnumerable<T> collection) // util para los inizializadores de objetos
        {
            AddRange(collection);
        }

        public void AddRange(IEnumerable<T> collection)
        {
            foreach (var item in collection)
                Add(item);
        }

        public ReadOnlyCollection<T> AsReadOnly()
        {
            return lista.AsReadOnly();
        }

        public void Sort()
        {
            lista.Sort();
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); 
        }

        public void Sort<S>(Func<T,S> element)
            where S:IComparable<S>
        {
            lista.Sort((a, b) => element(a).CompareTo(element(b)));
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); 
        }

        public void SortDescending<S>(Func<T, S> element)
            where S : IComparable<S>
        {
            lista.Sort((a, b) => element(b).CompareTo(element(a)));
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); 
        }

        public void Sort(Comparison<T> comparison)
        {
            lista.Sort(comparison);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); 
        }

        public void Sort(IComparer<T> comparer)
        {
            lista.Sort(comparer);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); 
        }

        public void Clear()
        {
            lista.Clear();
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); 
        }

        public void CopyTo(T[] array)
        {
            lista.CopyTo(array);
        }

        public IEnumerator<T> GetEnumerator()
        {
            return lista.GetEnumerator();
        }

        public void Insert(int index, T item)
        {
            lista.Insert(index, item);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add,item, index));
        }
     
        public bool Remove(T item)
        {
            int index =  lista.IndexOf(item);
            if (index == -1) return false;
            lista.RemoveAt(index);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item , index));
            return true;
        }

        public int RemoveAll(Predicate<T> match)
        {
            var toRemove = lista.Where(a => match(a)).ToList();
            foreach (var item in toRemove)
                Remove(item);
            return toRemove.Count; 
        }

        public void RemoveAt(int index)
        {
            T item = lista[index];
            lista.RemoveAt(index);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, index));
        }

        public void RemoveRange(int index, int count)
        {
            for (int i = 0; i < count; i++)
                RemoveAt(index); 
        }

        public int IndexOf(T item)
        {
            return lista.IndexOf(item);
        }

        public bool Contains(T item)
        {
            return lista.Contains(item);
        }

        public void CopyTo(T[] array, int arrayIndex)
        {
            lista.CopyTo(array, arrayIndex);
        }

        public bool IsReadOnly
        {
            get { return false; }
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }

        public override string ToString()
        {
            return "{0}{{ Count = {1} }}".Formato(GetType().TypeName(), Count);
        }

        #region IList Members

        int IList.Add(object value)
        {
            this.Add((T)value);
            return 0; 
        }

        bool IList.Contains(object value)
        {
            return this.Contains((T)value); 
        }

        int IList.IndexOf(object value)
        {
            return this.IndexOf((T)value); 
        }

        void IList.Insert(int index, object value)
        {
            this.Insert(index, (T)value); 
        }

        bool IList.IsFixedSize
        {
            get { return false;  }
        }

        void IList.Remove(object value)
        {
            this.Remove((T)value); 
        }

        object IList.this[int index]
        {
            get { return this[index]; }
            set { this[index] = (T)value; }
        }

        void ICollection.CopyTo(Array array, int index)
        {
            ((ICollection)lista).CopyTo(array, index); 
        }

        bool ICollection.IsSynchronized
        {
            get { return ((ICollection)lista).IsSynchronized; }
        }

        object ICollection.SyncRoot
        {
            get { return ((ICollection)lista).SyncRoot; }
        }

        #endregion 
    }

    internal sealed class MListDebugging<T>
    {
        private ICollection<T> collection;

        public MListDebugging(ICollection<T> collection)
        {
            this.collection = collection;
        }

        [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
        public T[] Items
        {
            get
            {
                T[] array = new T[this.collection.Count];
                this.collection.CopyTo(array, 0);
                return array;
            }
        }
    }

    public static class MListExtensions
    {
        public static MList<T> ToMList<T>(this IEnumerable<T> collection)
        {
            return new MList<T>(collection); 
        }
    }
}