using System; using System.Collections; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Threading; namespace Newtonsoft.Json.Utilities { internal class CollectionWrapper<T> : ICollection<T>, IEnumerable<T>, IEnumerable, IWrappedCollection, IList, ICollection { private readonly IList _list; private readonly ICollection<T> _genericCollection; private object _syncRoot; public virtual int Count { get { if (_genericCollection != null) return _genericCollection.Count; return _list.Count; } } public virtual bool IsReadOnly { get { if (_genericCollection != null) return _genericCollection.IsReadOnly; return _list.IsReadOnly; } } bool IList.IsFixedSize { get { if (_genericCollection != null) return _genericCollection.IsReadOnly; return _list.IsFixedSize; } } object IList.this[int index] { get { if (_genericCollection != null) throw new InvalidOperationException("Wrapped ICollection<T> does not support indexer."); return _list[index]; } set { if (_genericCollection != null) throw new InvalidOperationException("Wrapped ICollection<T> does not support indexer."); VerifyValueType(value); _list[index] = (T)value; } } bool ICollection.IsSynchronized { get { return false; } } object ICollection.SyncRoot { get { if (_syncRoot == null) Interlocked.CompareExchange(ref _syncRoot, new object(), null); return _syncRoot; } } public object UnderlyingCollection => ((object)_genericCollection) ?? ((object)_list); public CollectionWrapper(IList list) { ValidationUtils.ArgumentNotNull(list, "list"); ICollection<T> genericCollection; if ((genericCollection = (list as ICollection<T>)) != null) _genericCollection = genericCollection; else _list = list; } public CollectionWrapper(ICollection<T> list) { ValidationUtils.ArgumentNotNull(list, "list"); _genericCollection = list; } public virtual void Add(T item) { if (_genericCollection != null) _genericCollection.Add(item); else _list.Add(item); } public virtual void Clear() { if (_genericCollection != null) _genericCollection.Clear(); else _list.Clear(); } public virtual bool Contains(T item) { if (_genericCollection != null) return _genericCollection.Contains(item); return _list.Contains(item); } public virtual void CopyTo(T[] array, int arrayIndex) { if (_genericCollection != null) _genericCollection.CopyTo(array, arrayIndex); else _list.CopyTo(array, arrayIndex); } public virtual bool Remove(T item) { if (_genericCollection != null) return _genericCollection.Remove(item); bool num = _list.Contains(item); if (num) _list.Remove(item); return num; } public virtual IEnumerator<T> GetEnumerator() { IEnumerable<T> genericCollection = _genericCollection; return (genericCollection ?? Enumerable.Cast<T>((IEnumerable)_list)).GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { IEnumerable genericCollection = _genericCollection; return (genericCollection ?? _list).GetEnumerator(); } int IList.Add(object value) { VerifyValueType(value); Add((T)value); return Count - 1; } bool IList.Contains(object value) { if (IsCompatibleObject(value)) return Contains((T)value); return false; } int IList.IndexOf(object value) { if (_genericCollection != null) throw new InvalidOperationException("Wrapped ICollection<T> does not support IndexOf."); if (IsCompatibleObject(value)) return _list.IndexOf((T)value); return -1; } void IList.RemoveAt(int index) { if (_genericCollection != null) throw new InvalidOperationException("Wrapped ICollection<T> does not support RemoveAt."); _list.RemoveAt(index); } void IList.Insert(int index, object value) { if (_genericCollection != null) throw new InvalidOperationException("Wrapped ICollection<T> does not support Insert."); VerifyValueType(value); _list.Insert(index, (T)value); } void IList.Remove(object value) { if (IsCompatibleObject(value)) Remove((T)value); } void ICollection.CopyTo(Array array, int arrayIndex) { CopyTo((T[])array, arrayIndex); } private static void VerifyValueType(object value) { if (!IsCompatibleObject(value)) throw new ArgumentException("The value '{0}' is not of type '{1}' and cannot be used in this generic collection.".FormatWith(CultureInfo.InvariantCulture, value, typeof(T)), "value"); } private static bool IsCompatibleObject(object value) { if (!(value is T) && (value != null || (typeof(T).IsValueType() && !ReflectionUtils.IsNullableType(typeof(T))))) return false; return true; } } }