// Copyright 2010 Chris Patterson
//  
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use 
// this file except in compliance with the License. You may obtain a copy of the 
// License at 
// 
//     http://www.apache.org/licenses/LICENSE-2.0 
// 
// Unless required by applicable law or agreed to in writing, software distributed 
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
// CONDITIONS OF ANY KIND, either express or implied. See the License for the 
// specific language governing permissions and limitations under the License.
namespace Stact.Internal
{
	using System.Collections.Generic;

	public class MessageDictionaryImpl<TKey, TValue> :
		MessageDictionary<TKey, TValue>
	{
		private readonly KeyAccessor<TValue, TKey> _keyAccessor;
		private Dictionary<TKey, TValue> _messages = new Dictionary<TKey, TValue>();

		public MessageDictionaryImpl(KeyAccessor<TValue, TKey> keyAccessor)
		{
			_keyAccessor = keyAccessor;
		}

		public void Add(TValue message)
		{
			TKey key = _keyAccessor(message);

			_messages[key] = message;
		}

		public IDictionary<TKey, TValue> RemoveAll()
		{
			Dictionary<TKey, TValue> result = _messages;

			_messages = new Dictionary<TKey, TValue>();

			return result;
		}
	}
}