// SNMP context class.// Copyright (C) 2009-2010 Lex Li// // Permission is hereby granted, free of charge, to any person obtaining a copy of this// software and associated documentation files (the "Software"), to deal in the Software// without restriction, including without limitation the rights to use, copy, modify, merge,// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons// to whom the Software is furnished to do so, subject to the following conditions://// The above copyright notice and this permission notice shall be included in all copies or// substantial portions of the Software.//// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER// DEALINGS IN THE SOFTWARE. using System;using System.Collections.Generic;using System.Net;using GSF.Net.Snmp.Messaging;using GSF.Net.Snmp.Security; namespace GSF.Net.Snmp.Pipeline{    /// <summary>    /// SNMP context.    /// </summary>    internal abstract class SnmpContextBase : ISnmpContext    {        /// <summary>        /// Initializes a new instance of the <see cref="SnmpContextBase"/> class.        /// </summary>        /// <param name="request">The request.</param>        /// <param name="sender">The sender.</param>        /// <param name="users">The users.</param>        /// <param name="group">The engine core group.</param>        /// <param name="binding">The binding.</param>        protected SnmpContextBase(ISnmpMessage request, IPEndPoint sender, UserRegistry users, EngineGroup group, IListenerBinding binding)        {            Request = request;            Binding = binding;            Users = users;            Sender = sender;            CreatedTime = DateTime.Now;            Group = group;        }         /// <summary>        /// Gets or sets the binding.        /// </summary>        /// <value>The binding.</value>        public IListenerBinding Binding { get; private set; }         /// <summary>        /// Gets the created time.        /// </summary>        /// <value>The created time.</value>        public DateTime CreatedTime { get; private set; }         /// <summary>        /// Gets the request.        /// </summary>        /// <value>The request.</value>        public ISnmpMessage Request { get; private set; }         /// <summary>        /// Gets the users.        /// </summary>        /// <value>The users.</value>        protected UserRegistry Users { get; private set; }         /// <summary>        /// Gets the response.        /// </summary>        /// <value>The response.</value>        public ISnmpMessage Response { get; protected set; }         /// <summary>        /// Gets the sender.        /// </summary>        /// <value>The sender.</value>        public IPEndPoint Sender { get; private set; }         /// <summary>        /// Gets or sets the objects.        /// </summary>        /// <value>The objects.</value>        protected EngineGroup Group { get; private set; }         /// <summary>        /// Gets a value indicating whether [too big].        /// </summary>        /// <value><c>true</c> if the response is too big; otherwise, <c>false</c>.</value>        public bool TooBig        {            get            {                int length = Response.ToBytes().Length;                return length > Request.Header.MaxSize || length > Messenger.MaxMessageSize;            }        }         /// <summary>        /// Sends out response message.        /// </summary>        public void SendResponse()        {            if (Response == null)            {                return;            }             Binding.SendResponse(Response, Sender);        }         /// <summary>        /// Generates the response.        /// </summary>        /// <param name="variables">The variables.</param>        public abstract void GenerateResponse(IList<Variable> variables);         /// <summary>        /// Copies the request variable bindings to response.        /// </summary>        /// <param name="status">The status.</param>        /// <param name="index">The index.</param>        public abstract void CopyRequest(ErrorCode status, int index);         /// <summary>        /// Handles the membership authentication.        /// </summary>        /// <returns></returns>        public abstract bool HandleMembership();         /// <summary>        /// Generates too big message.        /// </summary>        public abstract void GenerateTooBig();    }}