// Table object 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
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// DEALINGS IN THE SOFTWARE.

using System.Collections.Generic;
using System.Linq;

namespace GSF.Net.Snmp.Pipeline
{
    /// <summary>
    /// Object that represents a table.
    /// </summary>
    public abstract class TableObject : SnmpObjectBase
    {
        /// <summary>
        /// Gets the objects in the table.
        /// </summary>
        /// <value>The objects.</value>
        protected abstract IEnumerable<ScalarObject> Objects { get; }

        /// <summary>
        /// Matches the GET NEXT criteria.
        /// </summary>
        /// <param name="id">The ID in GET NEXT message.</param>
        /// <returns><c>null</c> if it does not match.</returns>
        public override ScalarObject MatchGetNext(ObjectIdentifier id)
        {
            return Objects.Select(o => o.MatchGetNext(id)).FirstOrDefault(result => result != null);
        }

        /// <summary>
        /// Matches the GET criteria.
        /// </summary>
        /// <param name="id">The ID in GET message.</param>
        /// <returns><c>null</c> if it does not match.</returns>
        public override ScalarObject MatchGet(ObjectIdentifier id)
        {
            return Objects.Select(o => o.MatchGet(id)).FirstOrDefault(result => result != null);
        }
    }
}