NadekoBot/NadekoBot.Core/Common/Collections/IndexedCollection.cs

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using System.Collections;
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using System.Collections.Generic;
using System.Linq;
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using NadekoBot.Services.Database.Models;
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namespace NadekoBot.Common.Collections
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{
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public class IndexedCollection<T> : IList<T> where T : class, IIndexed
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{
public List<T> Source { get; }
private readonly object _locker = new object();
public IndexedCollection(IEnumerable<T> source)
{
lock (_locker)
{
Source = source.OrderBy(x => x.Index).ToList();
for (var i = 0; i < Source.Count; i++)
{
if (Source[i].Index != i)
Source[i].Index = i;
}
}
}
public static implicit operator List<T>(IndexedCollection<T> x) =>
x.Source;
public IEnumerator<T> GetEnumerator() =>
Source.GetEnumerator();
IEnumerator IEnumerable.GetEnumerator() =>
Source.GetEnumerator();
public void Add(T item)
{
lock (_locker)
{
item.Index = Source.Count;
Source.Add(item);
}
}
public virtual void Clear()
{
lock (_locker)
{
Source.Clear();
}
}
public bool Contains(T item)
{
lock (_locker)
{
return Source.Contains(item);
}
}
public void CopyTo(T[] array, int arrayIndex)
{
lock (_locker)
{
Source.CopyTo(array, arrayIndex);
}
}
public virtual bool Remove(T item)
{
bool removed;
lock (_locker)
{
if (removed = Source.Remove(item))
{
for (int i = 0; i < Source.Count; i++)
{
// hm, no idea how ef works, so I don't want to set if it's not changed,
// maybe it will try to update db?
// But most likely it just compares old to new values, meh.
if (Source[i].Index != i)
Source[i].Index = i;
}
}
}
return removed;
}
public int Count => Source.Count;
public bool IsReadOnly => false;
public int IndexOf(T item) => item.Index;
public virtual void Insert(int index, T item)
{
lock (_locker)
{
Source.Insert(index, item);
for (int i = index; i < Source.Count; i++)
{
Source[i].Index = i;
}
}
}
public virtual void RemoveAt(int index)
{
lock (_locker)
{
Source.RemoveAt(index);
for (int i = index; i < Source.Count; i++)
{
Source[i].Index = i;
}
}
}
public virtual T this[int index] {
get { return Source[index]; }
set {
lock (_locker)
{
value.Index = index;
Source[index] = value;
}
}
}
}
}