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ByteArraySerializer.cs
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ByteArraySerializer.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 System.Globalization;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Represents a serializer for ByteArrays.
/// </summary>
public class ByteArraySerializer : SealedClassSerializerBase<byte[]>, IRepresentationConfigurable<ByteArraySerializer>
{
#region static
private static readonly ByteArraySerializer __instance = new ByteArraySerializer();
// public static properties
/// <summary>
/// Gets a cached instance of a ByteArraySerializer.
/// </summary>
public static ByteArraySerializer Instance => __instance;
#endregion
// private fields
private readonly BsonType _representation;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="ByteArraySerializer"/> class.
/// </summary>
public ByteArraySerializer()
: this(BsonType.Binary)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ByteArraySerializer"/> class.
/// </summary>
/// <param name="representation">The representation.</param>
public ByteArraySerializer(BsonType representation)
{
switch (representation)
{
case BsonType.Binary:
case BsonType.String:
break;
default:
var message = string.Format("{0} is not a valid representation for a ByteArraySerializer.", representation);
throw new ArgumentException(message);
}
_representation = representation;
}
// public properties
/// <summary>
/// Gets the representation.
/// </summary>
/// <value>
/// The representation.
/// </value>
public BsonType Representation
{
get { return _representation; }
}
// public methods
#pragma warning disable 618 // about obsolete BsonBinarySubType.OldBinary
/// <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 byte[] DeserializeValue(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var bsonReader = context.Reader;
BsonType bsonType = bsonReader.GetCurrentBsonType();
switch (bsonType)
{
case BsonType.Binary:
return bsonReader.ReadBytes();
case BsonType.String:
var s = bsonReader.ReadString();
if ((s.Length % 2) != 0)
{
s = "0" + s; // prepend a zero to make length even
}
var bytes = new byte[s.Length / 2];
for (int i = 0; i < s.Length; i += 2)
{
var hex = s.Substring(i, 2);
var b = byte.Parse(hex, NumberStyles.HexNumber);
bytes[i / 2] = b;
}
return bytes;
default:
throw CreateCannotDeserializeFromBsonTypeException(bsonType);
}
}
#pragma warning restore 618
/// <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, byte[] value)
{
var bsonWriter = context.Writer;
switch (_representation)
{
case BsonType.Binary:
bsonWriter.WriteBytes(value);
break;
case BsonType.String:
bsonWriter.WriteString(BsonUtils.ToHexString(value));
break;
default:
var message = string.Format("'{0}' is not a valid Byte[] 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 ByteArraySerializer WithRepresentation(BsonType representation)
{
if (representation == _representation)
{
return this;
}
else
{
return new ByteArraySerializer(representation);
}
}
// explicit interface implementations
IBsonSerializer IRepresentationConfigurable.WithRepresentation(BsonType representation)
{
return WithRepresentation(representation);
}
}
}