1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
#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;
}
}
}
|
