Merge commit '36bca61764984ff5395653cf8377ec5daa71b709' as 'libs/protobuf'

libs/protobuf/csharp/src/Google.Protobuf/Reflection/DescriptorBase.cs

@@ -0,0 +1,92 @@
+#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
+
+using System.Collections.Generic;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Base class for nearly all descriptors, providing common functionality.
+    /// </summary>
+    public abstract class DescriptorBase : IDescriptor
+    {
+        internal DescriptorBase(FileDescriptor file, string fullName, int index)
+        {
+            File = file;
+            FullName = fullName;
+            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; }
+
+        /// <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; }
+
+        /// <value>
+        /// The file this descriptor was declared in.
+        /// </value>
+        public FileDescriptor File { get; }
+
+        /// <summary>
+        /// The declaration information about the descriptor, or null if no declaration information
+        /// is available for this descriptor.
+        /// </summary>
+        /// <remarks>
+        /// This information is typically only available for dynamically loaded descriptors,
+        /// for example within a protoc plugin where the full descriptors, including source info,
+        /// are passed to the code by protoc.
+        /// </remarks>
+        public DescriptorDeclaration Declaration => File.GetDeclaration(this);
+
+        /// <summary>
+        /// Retrieves the list of nested descriptors corresponding to the given field number, if any.
+        /// If the field is unknown or not a nested descriptor list, return null to terminate the search.
+        /// The default implementation returns null.
+        /// </summary>
+        internal virtual IReadOnlyList<DescriptorBase> GetNestedDescriptorListForField(int fieldNumber) => null;
+    }
+}