| #region Copyright notice and license |
| // Protocol Buffers - Google's data interchange format |
| // Copyright 2015 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; |
| using System.IO; |
| |
| namespace Google.Protobuf |
| { |
| /// <summary> |
| /// A parser for a specific message type. |
| /// </summary> |
| /// <remarks> |
| /// <p> |
| /// This delegates most behavior to the |
| /// <see cref="IMessage.MergeFrom"/> implementation within the original type, but |
| /// provides convenient overloads to parse from a variety of sources. |
| /// </p> |
| /// <p> |
| /// Most applications will never need to create their own instances of this type; |
| /// instead, use the static <c>Parser</c> property of a generated message type to obtain a |
| /// parser for that type. |
| /// </p> |
| /// </remarks> |
| /// <typeparam name="T">The type of message to be parsed.</typeparam> |
| public sealed class MessageParser<T> where T : IMessage<T> |
| { |
| private readonly Func<T> factory; |
| |
| /// <summary> |
| /// Creates a new parser. |
| /// </summary> |
| /// <remarks> |
| /// The factory method is effectively an optimization over using a generic constraint |
| /// to require a parameterless constructor: delegates are significantly faster to execute. |
| /// </remarks> |
| /// <param name="factory">Function to invoke when a new, empty message is required.</param> |
| public MessageParser(Func<T> factory) |
| { |
| this.factory = factory; |
| } |
| |
| /// <summary> |
| /// Creates a template instance ready for population. |
| /// </summary> |
| /// <returns>An empty message.</returns> |
| internal T CreateTemplate() |
| { |
| return factory(); |
| } |
| |
| /// <summary> |
| /// Parses a message from a byte array. |
| /// </summary> |
| /// <param name="data">The byte array containing the message. Must not be null.</param> |
| /// <returns>The newly parsed message.</returns> |
| public T ParseFrom(byte[] data) |
| { |
| ThrowHelper.ThrowIfNull(data, "data"); |
| T message = factory(); |
| message.MergeFrom(data); |
| return message; |
| } |
| |
| public T ParseFrom(ByteString data) |
| { |
| ThrowHelper.ThrowIfNull(data, "data"); |
| T message = factory(); |
| message.MergeFrom(data); |
| return message; |
| } |
| |
| public T ParseFrom(Stream input) |
| { |
| T message = factory(); |
| message.MergeFrom(input); |
| return message; |
| } |
| |
| public T ParseDelimitedFrom(Stream input) |
| { |
| T message = factory(); |
| message.MergeDelimitedFrom(input); |
| return message; |
| } |
| |
| public T ParseFrom(CodedInputStream input) |
| { |
| T message = factory(); |
| message.MergeFrom(input); |
| return message; |
| } |
| } |
| } |