//------------------------------------------------------------------------------
// <copyright file="NameValuePair.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
// <owner current="true" primary="false">[....]</owner>
//------------------------------------------------------------------------------

namespace System.Data.Common {

    using System;
    using System.Data.Common;
    using System.Diagnostics;
    using System.Runtime.Serialization;

    [Serializable] // MDAC 83147
    sealed internal class NameValuePair {
        readonly private string _name;
        readonly private string _value;
        [OptionalField(VersionAdded=2)]
        readonly private int _length;
        private NameValuePair _next;

        internal NameValuePair(string name, string value, int length) {
            System.Diagnostics.Debug.Assert(!ADP.IsEmpty(name), "empty keyname");
            _name = name;
            _value = value;
            _length = length;
        }

        internal int Length {
            get {
                // this property won't exist when deserialized from Everett to Whidbey
                // it shouldn't matter for DbConnectionString/DbDataPermission
                // which should only use Length during construction
                // not deserialization or post-ctor runtime
                Debug.Assert(0 < _length, "NameValuePair zero Length usage");
                return _length;
            }
        }
        internal string Name {
            get {
                return _name;
            }
        }
        internal NameValuePair Next {
            get {
                return _next;
            }
            set {
                if ((null != _next) || (null == value)) {
                    throw ADP.InternalError(ADP.InternalErrorCode.NameValuePairNext);
                }
                _next = value;
            }
        }
        internal string Value {
            get {
                return _value;
            }
        }
    }
}