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path: root/crypto/src/util/collections/UnmodifiableList.cs
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using System;
using System.Collections;

namespace Org.BouncyCastle.Utilities.Collections
{
	public abstract class UnmodifiableList
		: IList
	{
		protected UnmodifiableList()
		{
		}

		public virtual int Add(object o)
		{
			throw new NotSupportedException();
		}

		public virtual void Clear()
		{
			throw new NotSupportedException();
		}

		public abstract bool Contains(object o);

		public abstract void CopyTo(Array array, int index);

		public abstract int Count { get; }

		public abstract IEnumerator GetEnumerator();

		public abstract int IndexOf(object o);

		public virtual void Insert(int i, object o)
		{
			throw new NotSupportedException();
		}

		public abstract bool IsFixedSize { get; }

		public virtual bool IsReadOnly
		{
			get { return true; }
		}

		public abstract bool IsSynchronized { get; }

		public virtual void Remove(object o)
		{
			throw new NotSupportedException();
		}

		public virtual void RemoveAt(int i)
		{
			throw new NotSupportedException();
		}

		public abstract object SyncRoot { get; }
		
		public virtual object this[int i]
		{
			get { return GetValue(i); }
			set { throw new NotSupportedException(); }
		}

		protected abstract object GetValue(int i);
	}
}