-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
DynamicDocumentBaseSerializer.cs
146 lines (130 loc) · 5.7 KB
/
DynamicDocumentBaseSerializer.cs
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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/* Copyright 2010-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Dynamic;
using System.Linq.Expressions;
using MongoDB.Bson.IO;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Base serializer for dynamic types.
/// </summary>
/// <typeparam name="T">The dynamic type.</typeparam>
public abstract class DynamicDocumentBaseSerializer<T> : SerializerBase<T> where T : class, IDynamicMetaObjectProvider
{
// private static fields
private static readonly IBsonSerializer<object> _objectSerializer = BsonSerializer.LookupSerializer<object>();
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="DynamicDocumentBaseSerializer{T}"/> class.
/// </summary>
protected DynamicDocumentBaseSerializer()
{ }
// public methods
/// <summary>
/// Deserializes a value.
/// </summary>
/// <param name="context">The deserialization context.</param>
/// <param name="args">The deserialization args.</param>
/// <returns>A deserialized value.</returns>
public override T Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var bsonReader = context.Reader;
var bsonType = bsonReader.GetCurrentBsonType();
string message;
switch (bsonType)
{
case BsonType.Document:
var dynamicContext = context.With(ConfigureDeserializationContext);
bsonReader.ReadStartDocument();
var document = CreateDocument();
while (bsonReader.ReadBsonType() != BsonType.EndOfDocument)
{
var name = bsonReader.ReadName();
var value = _objectSerializer.Deserialize(dynamicContext);
SetValueForMember(document, name, value);
}
bsonReader.ReadEndDocument();
return document;
case BsonType.Null:
bsonReader.ReadNull();
return null;
default:
message = string.Format("Cannot deserialize a '{0}' from BsonType '{1}'.", BsonUtils.GetFriendlyTypeName(typeof(T)), bsonType);
throw new FormatException(message);
}
}
/// <summary>
/// Serializes a value.
/// </summary>
/// <param name="context">The serialization context.</param>
/// <param name="args">The serialization args.</param>
/// <param name="value">The object.</param>
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, T value)
{
var bsonWriter = context.Writer;
if (value == null)
{
bsonWriter.WriteNull();
return;
}
var metaObject = value.GetMetaObject(Expression.Constant(value));
var memberNames = metaObject.GetDynamicMemberNames();
var dynamicContext = context.With(ConfigureSerializationContext);
bsonWriter.WriteStartDocument();
foreach (var memberName in memberNames)
{
object memberValue;
if (TryGetValueForMember(value, memberName, out memberValue))
{
bsonWriter.WriteName(memberName);
_objectSerializer.Serialize(dynamicContext, memberValue);
}
}
bsonWriter.WriteEndDocument();
}
// protected methods
/// <summary>
/// Configures the deserialization context.
/// </summary>
/// <param name="builder">The builder.</param>
protected abstract void ConfigureDeserializationContext(BsonDeserializationContext.Builder builder);
/// <summary>
/// Configures the serialization context.
/// </summary>
/// <param name="builder">The builder.</param>
protected abstract void ConfigureSerializationContext(BsonSerializationContext.Builder builder);
/// <summary>
/// Creates the document.
/// </summary>
/// <returns>A <typeparamref name="T"/></returns>
protected abstract T CreateDocument();
/// <summary>
/// Sets the value for the member.
/// </summary>
/// <param name="document">The document.</param>
/// <param name="memberName">Name of the member.</param>
/// <param name="value">The value.</param>
protected abstract void SetValueForMember(T document, string memberName, object value);
/// <summary>
/// Tries to get the value for a member. Returns true if the member should be serialized.
/// </summary>
/// <param name="document">The document.</param>
/// <param name="memberName">Name of the member.</param>
/// <param name="value">The value.</param>
/// <returns><c>true</c> if the member should be serialized; otherwise <c>false</c>.</returns>
protected abstract bool TryGetValueForMember(T document, string memberName, out object value);
}
}