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VersionSerializer.cs
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VersionSerializer.cs
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/* 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 MongoDB.Bson.IO;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Represents a serializer for Versions.
/// </summary>
public class VersionSerializer : SealedClassSerializerBase<Version>, IRepresentationConfigurable<VersionSerializer>
{
// private constants
private static class Flags
{
public const long Major = 1;
public const long Minor = 2;
public const long Build = 4;
public const long Revision = 8;
public const long All = Major | Minor | Build | Revision;
public const long MajorMinor = Major | Minor;
public const long MajorMinorBuild = Major | Minor | Build;
}
// private fields
private readonly SerializerHelper _helper;
private readonly Int32Serializer _int32Serializer = new Int32Serializer();
private readonly BsonType _representation;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="VersionSerializer"/> class.
/// </summary>
public VersionSerializer()
: this(BsonType.String)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="VersionSerializer"/> class.
/// </summary>
/// <param name="representation">The representation.</param>
public VersionSerializer(BsonType representation)
{
switch (representation)
{
case BsonType.Document:
case BsonType.String:
break;
default:
var message = string.Format("{0} is not a valid representation for a VersionSerializer.", representation);
throw new ArgumentException(message);
}
_representation = representation;
_helper = new SerializerHelper
(
new SerializerHelper.Member("Major", Flags.Major),
new SerializerHelper.Member("Minor", Flags.Minor),
new SerializerHelper.Member("Build", Flags.Build, isOptional: true),
new SerializerHelper.Member("Revision", Flags.Revision, isOptional: true)
);
}
// public properties
/// <summary>
/// Gets the representation.
/// </summary>
/// <value>
/// The representation.
/// </value>
public BsonType Representation
{
get { return _representation; }
}
// 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>
protected override Version DeserializeValue(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var bsonReader = context.Reader;
BsonType bsonType = bsonReader.GetCurrentBsonType();
switch (bsonType)
{
case BsonType.Document:
int major = 0, minor = 0, build = 0, revision = 0;
var foundMemberFlags = _helper.DeserializeMembers(context, (elementName, flag) =>
{
switch (flag)
{
case Flags.Major: major = _int32Serializer.Deserialize(context); break;
case Flags.Minor: minor = _int32Serializer.Deserialize(context); break;
case Flags.Build: build = _int32Serializer.Deserialize(context); break;
case Flags.Revision: revision = _int32Serializer.Deserialize(context); break;
}
});
switch (foundMemberFlags)
{
case Flags.MajorMinor: return new Version(major, minor);
case Flags.MajorMinorBuild: return new Version(major, minor, build);
case Flags.All: return new Version(major, minor, build, revision);
default: throw new BsonInternalException();
}
case BsonType.String:
return new Version(bsonReader.ReadString());
default:
throw CreateCannotDeserializeFromBsonTypeException(bsonType);
}
}
/// <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>
protected override void SerializeValue(BsonSerializationContext context, BsonSerializationArgs args, Version value)
{
var bsonWriter = context.Writer;
switch (_representation)
{
case BsonType.Document:
bsonWriter.WriteStartDocument();
bsonWriter.WriteInt32("Major", value.Major);
bsonWriter.WriteInt32("Minor", value.Minor);
if (value.Build != -1)
{
bsonWriter.WriteInt32("Build", value.Build);
if (value.Revision != -1)
{
bsonWriter.WriteInt32("Revision", value.Revision);
}
}
bsonWriter.WriteEndDocument();
break;
case BsonType.String:
bsonWriter.WriteString(value.ToString());
break;
default:
var message = string.Format("'{0}' is not a valid Version representation.", _representation);
throw new BsonSerializationException(message);
}
}
/// <summary>
/// Returns a serializer that has been reconfigured with the specified representation.
/// </summary>
/// <param name="representation">The representation.</param>
/// <returns>The reconfigured serializer.</returns>
public VersionSerializer WithRepresentation(BsonType representation)
{
if (representation == _representation)
{
return this;
}
else
{
return new VersionSerializer(representation);
}
}
// explicit interface implementations
IBsonSerializer IRepresentationConfigurable.WithRepresentation(BsonType representation)
{
return WithRepresentation(representation);
}
}
}