protobuf/src/ProtocolBuffers/GeneratedBuilderLite.cs

#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;

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 class GeneratedBuilderLite<TMessage, TBuilder> : AbstractBuilderLite<TMessage, TBuilder>
    where TMessage : GeneratedMessageLite<TMessage, TBuilder>
    where TBuilder : GeneratedBuilderLite<TMessage, TBuilder> {

    /// <summary>
    /// Returns the message being built at the moment.
    /// </summary>
    protected abstract TMessage MessageBeingBuilt { get; }

    public override TBuilder MergeFrom(IMessageLite other) {
      //do nothing, Lite runtime does not support cross-message merges
      return ThisBuilder;
    }

    public abstract TBuilder MergeFrom(TMessage other);

    public override bool IsInitialized {
      get { return MessageBeingBuilt.IsInitialized; }
    }

    /// <summary>
    /// Adds all of the specified values to the given collection.
    /// </summary>
    /// <exception cref="ArgumentNullException">Any element of the list is null</exception>
    protected void AddRange<T>(IEnumerable<T> source, IList<T> destination) {
      ThrowHelper.ThrowIfNull(source);
      // We only need to check this for nullable types.
      if (default(T) == null) {
        ThrowHelper.ThrowIfAnyNull(source);
      }
      List<T> list = destination as List<T>;
      if (list != null) {
        list.AddRange(source);
      } else {
        foreach (T element in source) {
          destination.Add(element);
        }
      }
    }

    /// <summary>
    /// Called by derived classes to parse an unknown field.
    /// </summary>
    /// <returns>true unless the tag is an end-group tag</returns>
    [CLSCompliant(false)]
    protected virtual bool ParseUnknownField(CodedInputStream input, 
                                     ExtensionRegistry extensionRegistry, uint tag) {
      return input.SkipField(tag);
    }

    /// <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 (MessageBeingBuilt != null && !IsInitialized) {
        throw new UninitializedMessageException(MessageBeingBuilt);
      }
      return BuildPartial();
    }
  }
}