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diff --git a/csharp/src/ProtocolBuffers/GeneratedBuilder.cs b/csharp/src/ProtocolBuffers/GeneratedBuilder.cs
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--- a/csharp/src/ProtocolBuffers/GeneratedBuilder.cs
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-#region Copyright notice and license
-
-// 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.
-
-#endregion
-
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using Google.ProtocolBuffers.Descriptors;
-using Google.ProtocolBuffers.FieldAccess;
-
-namespace Google.ProtocolBuffers
-{
- /// <summary>
- /// All generated protocol message builder classes extend this class. It implements
- /// most of the IBuilder interface using reflection. Users can ignore this class
- /// as an implementation detail.
- /// </summary>
- public abstract partial class GeneratedBuilder<TMessage, TBuilder> : AbstractBuilder<TMessage, TBuilder>
- where TMessage : GeneratedMessage<TMessage, TBuilder>
- where TBuilder : GeneratedBuilder<TMessage, TBuilder>, new()
- {
- /// <summary>
- /// Returns the message being built at the moment.
- /// </summary>
- protected abstract TMessage MessageBeingBuilt { get; }
-
- protected internal FieldAccessorTable<TMessage, TBuilder> InternalFieldAccessors
- {
- get { return DefaultInstanceForType.FieldAccessorsFromBuilder; }
- }
-
- public override IDictionary<FieldDescriptor, object> AllFields
- {
- get { return MessageBeingBuilt.AllFields; }
- }
-
- public override object this[FieldDescriptor field]
- {
- get
- {
- // For repeated fields, the underlying list object is still modifiable at this point.
- // Make sure not to expose the modifiable list to the caller.
- return field.IsRepeated
- ? InternalFieldAccessors[field].GetRepeatedWrapper(ThisBuilder)
- : MessageBeingBuilt[field];
- }
- set { InternalFieldAccessors[field].SetValue(ThisBuilder, value); }
- }
-
- /// <summary>
- /// Called by derived classes to parse an unknown field.
- /// </summary>
- /// <returns>true unless the tag is an end-group tag</returns>
- protected virtual bool ParseUnknownField(ICodedInputStream input, UnknownFieldSet.Builder unknownFields,
- ExtensionRegistry extensionRegistry, uint tag, string fieldName)
- {
- return unknownFields.MergeFieldFrom(tag, input);
- }
-
- public override MessageDescriptor DescriptorForType
- {
- get { return DefaultInstanceForType.DescriptorForType; }
- }
-
- public override int GetRepeatedFieldCount(FieldDescriptor field)
- {
- return MessageBeingBuilt.GetRepeatedFieldCount(field);
- }
-
- public override object this[FieldDescriptor field, int index]
- {
- get { return MessageBeingBuilt[field, index]; }
- set { InternalFieldAccessors[field].SetRepeated(ThisBuilder, index, value); }
- }
-
- public override bool HasOneof(OneofDescriptor oneof)
- {
- return MessageBeingBuilt.HasOneof(oneof);
- }
-
- public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)
- {
- return MessageBeingBuilt.OneofFieldDescriptor(oneof);
- }
-
- public override bool HasField(FieldDescriptor field)
- {
- return MessageBeingBuilt.HasField(field);
- }
-
- public override IBuilder CreateBuilderForField(FieldDescriptor field)
- {
- return InternalFieldAccessors[field].CreateBuilder();
- }
-
- public override TBuilder ClearField(FieldDescriptor field)
- {
- InternalFieldAccessors[field].Clear(ThisBuilder);
- return ThisBuilder;
- }
-
- public override TBuilder ClearOneof(OneofDescriptor oneof)
- {
- InternalFieldAccessors.Oneof(oneof).Clear(ThisBuilder);
- return ThisBuilder;
- }
-
- public override TBuilder MergeFrom(TMessage other)
- {
- if (other.DescriptorForType != InternalFieldAccessors.Descriptor)
- {
- throw new ArgumentException("Message type mismatch");
- }
-
- foreach (KeyValuePair<FieldDescriptor, object> entry in other.AllFields)
- {
- FieldDescriptor field = entry.Key;
- if (field.IsRepeated)
- {
- // Concatenate repeated fields
- foreach (object element in (IEnumerable) entry.Value)
- {
- AddRepeatedField(field, element);
- }
- }
- else if (field.MappedType == MappedType.Message && HasField(field))
- {
- // Merge singular embedded messages
- IMessageLite oldValue = (IMessageLite) this[field];
- this[field] = oldValue.WeakCreateBuilderForType()
- .WeakMergeFrom(oldValue)
- .WeakMergeFrom((IMessageLite) entry.Value)
- .WeakBuildPartial();
- }
- else
- {
- // Just overwrite
- this[field] = entry.Value;
- }
- }
-
- //Fix for unknown fields not merging, see java's AbstractMessage.Builder<T> line 236
- MergeUnknownFields(other.UnknownFields);
-
- return ThisBuilder;
- }
-
- public override TBuilder MergeUnknownFields(UnknownFieldSet unknownFields)
- {
- if (unknownFields != UnknownFieldSet.DefaultInstance)
- {
- TMessage result = MessageBeingBuilt;
- result.SetUnknownFields(UnknownFieldSet.CreateBuilder(result.UnknownFields)
- .MergeFrom(unknownFields)
- .Build());
- }
- return ThisBuilder;
- }
-
- public override TBuilder AddRepeatedField(FieldDescriptor field, object value)
- {
- InternalFieldAccessors[field].AddRepeated(ThisBuilder, value);
- return ThisBuilder;
- }
-
- /// <summary>
- /// Like Build(), but will wrap UninitializedMessageException in
- /// InvalidProtocolBufferException.
- /// </summary>
- public TMessage BuildParsed()
- {
- if (!IsInitialized)
- {
- throw new UninitializedMessageException(MessageBeingBuilt).AsInvalidProtocolBufferException();
- }
- return BuildPartial();
- }
-
- /// <summary>
- /// Implementation of <see cref="IBuilder{TMessage, TBuilder}.Build" />.
- /// </summary>
- public override TMessage Build()
- {
- // If the message is null, we'll throw a more appropriate exception in BuildPartial.
- if (!IsInitialized)
- {
- throw new UninitializedMessageException(MessageBeingBuilt);
- }
- return BuildPartial();
- }
-
- public override UnknownFieldSet UnknownFields
- {
- get { return MessageBeingBuilt.UnknownFields; }
- set { MessageBeingBuilt.SetUnknownFields(value); }
- }
- }
-} \ No newline at end of file