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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Reflection;
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using MongoDB.Bson;
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using MongoDB.Bson.IO;
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using MongoDB.Bson.Serialization;
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using MongoDB.Bson.Serialization.Attributes;
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using MongoDB.Bson.Serialization.Options;
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using MongoDB.Bson.Serialization.Serializers;
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namespace ET
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{
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public class StructBsonSerialize<TValue>: StructSerializerBase<TValue> where TValue : struct
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{
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public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, TValue value)
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{
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Type nominalType = args.NominalType;
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IBsonWriter bsonWriter = context.Writer;
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bsonWriter.WriteStartDocument();
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FieldInfo[] fields = nominalType.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
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foreach (FieldInfo field in fields)
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{
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bsonWriter.WriteName(field.Name);
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BsonSerializer.Serialize(bsonWriter, field.FieldType, field.GetValue(value));
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}
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bsonWriter.WriteEndDocument();
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}
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public override TValue Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
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{
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//boxing is required for SetValue to work
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object obj = new TValue();
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Type actualType = args.NominalType;
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IBsonReader bsonReader = context.Reader;
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bsonReader.ReadStartDocument();
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while (bsonReader.ReadBsonType() != BsonType.EndOfDocument)
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{
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string name = bsonReader.ReadName(Utf8NameDecoder.Instance);
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FieldInfo field = actualType.GetField(name,BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
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if (field != null)
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{
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var deserializer = BsonSerializer.LookupSerializer(field.FieldType);
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deserializer = ApplyRepresentationConfig(deserializer, field);
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object value = deserializer.Deserialize(BsonDeserializationContext.CreateRoot(bsonReader));
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field.SetValue(obj, value);
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}
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}
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bsonReader.ReadEndDocument();
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return (TValue) obj;
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}
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protected IBsonSerializer ApplyRepresentationConfig(IBsonSerializer deserializer, FieldInfo field)
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{
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System.Object[] myAttributes = field.GetCustomAttributes(typeof(BsonRepresentationAttribute), false);
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if (myAttributes.Length > 0)
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{
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// 参考BsonRepresentationAttribute中的Apply的写法,那个方法是个protect的,调用不到
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var representationAttr = myAttributes[0] as BsonRepresentationAttribute;
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if (deserializer is IRepresentationConfigurable configurable)
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{
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deserializer = configurable.WithRepresentation(representationAttr.Representation);
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}
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if (deserializer is IRepresentationConverterConfigurable converterConfigurable)
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{
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RepresentationConverter converter = new RepresentationConverter(representationAttr.AllowOverflow, representationAttr.AllowTruncation);
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deserializer = converterConfigurable.WithConverter(converter);
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}
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}
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return deserializer;
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}
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}
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}
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