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+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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.
+#endregion
+
+namespace Google.Protobuf.Reflection
+{
+ /// <summary>
+ /// Base class for nearly all descriptors, providing common functionality.
+ /// </summary>
+ public abstract class DescriptorBase : IDescriptor
+ {
+ private readonly FileDescriptor file;
+ private readonly string fullName;
+ private readonly int index;
+
+ internal DescriptorBase(FileDescriptor file, string fullName, int index)
+ {
+ this.file = file;
+ this.fullName = 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; }
+ }
+
+ /// <summary>
+ /// Returns the name of the entity (field, message etc) being described.
+ /// </summary>
+ public abstract string Name { get; }
+
+ /// <summary>
+ /// The fully qualified name of the descriptor's target.
+ /// </summary>
+ public string FullName
+ {
+ get { return fullName; }
+ }
+
+ /// <value>
+ /// The file this descriptor was declared in.
+ /// </value>
+ public FileDescriptor File
+ {
+ get { return file; }
+ }
+ }
+} \ No newline at end of file