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// 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,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
using Google.ProtocolBuffers.DescriptorProtos;

namespace Google.ProtocolBuffers.Descriptors {
  /// <summary>
  /// Base class for nearly all descriptors, providing common functionality.
  /// </summary>
  /// <typeparam name="TProto">Type of the protocol buffer form of this descriptor</typeparam>
  /// <typeparam name="TOptions">Type of the options protocol buffer for this descriptor</typeparam>
  public abstract class DescriptorBase<TProto, TOptions> : IDescriptor<TProto>
      where TProto : IMessage, IDescriptorProto<TOptions> {

    private readonly TProto proto;
    private readonly FileDescriptor file;
    private readonly string fullName;

    protected DescriptorBase(TProto proto, FileDescriptor file, string fullName) {
      this.proto = proto;
      this.file = file;
      this.fullName = fullName;
    }

    protected static string ComputeFullName(FileDescriptor file, MessageDescriptor parent, string name) {
      if (parent != null) {
        return parent.FullName + "." + name;
      }
      if (file.Package.Length > 0) {
        return file.Package + "." + name;
      }
      return name;
    }

    IMessage IDescriptor.Proto {
      get { return proto; }
    }

    /// <summary>
    /// Returns the protocol buffer form of this descriptor
    /// </summary>
    public TProto Proto {
      get { return proto; }
    }

    public TOptions Options {
      get { return proto.Options; }
    }

    /// <summary>
    /// The fully qualified name of the descriptor's target.
    /// </summary>
    public string FullName {
      get { return fullName; }
    }

    /// <summary>
    /// The brief name of the descriptor's target.
    /// </summary>
    public string Name {
      get { return proto.Name; }
    }

    /// <value>
    /// The file this descriptor was declared in.
    /// </value>
    public FileDescriptor File {
      get { return file; }
    }
  }
}