// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
using Google.ProtocolBuffers.DescriptorProtos;

namespace Google.ProtocolBuffers.Descriptors {
  /// <summary>
  /// Base class for descriptors which are also indexed. This is all of them other than
  /// <see cref="FileDescriptor" />.
  /// </summary>
  public abstract class IndexedDescriptorBase<TProto, TOptions> : DescriptorBase<TProto, TOptions>
      where TProto : IMessage<TProto>, IDescriptorProto<TOptions> {

    private readonly int index;

    protected IndexedDescriptorBase(TProto proto, FileDescriptor file, string fullName, int index)
        : base(proto, file, fullName) {
      this.index = index;
    }

    /// <value>
    /// The index of this descriptor within its parent descriptor. 
    /// </value>
    /// <remarks>
    /// This returns the index of this descriptor within its parent, for
    /// this descriptor's type. (There can be duplicate values for different
    /// types, e.g. one enum type with index 0 and one message type with index 0.)
    /// </remarks>
    public int Index {
      get { return index; }
    }
  }
}
