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BsonBinaryDataGuidGenerator.cs
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BsonBinaryDataGuidGenerator.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.Linq;
namespace MongoDB.Bson.Serialization.IdGenerators
{
/// <summary>
/// Represents an Id generator for Guids stored in BsonBinaryData values.
/// </summary>
public class BsonBinaryDataGuidGenerator : IIdGenerator
{
// private static fields
private static BsonBinaryDataGuidGenerator __csharpLegacyInstance = new BsonBinaryDataGuidGenerator(GuidRepresentation.CSharpLegacy);
private static BsonBinaryDataGuidGenerator __javaLegacyInstance = new BsonBinaryDataGuidGenerator(GuidRepresentation.JavaLegacy);
private static BsonBinaryDataGuidGenerator __pythonLegacyInstance = new BsonBinaryDataGuidGenerator(GuidRepresentation.PythonLegacy);
private static BsonBinaryDataGuidGenerator __standardInstance = new BsonBinaryDataGuidGenerator(GuidRepresentation.Standard);
private static BsonBinaryDataGuidGenerator __unspecifiedInstance = new BsonBinaryDataGuidGenerator(GuidRepresentation.Unspecified);
private static byte[] __emptyGuidBytes = Guid.Empty.ToByteArray();
// private fields
private GuidRepresentation _guidRepresentation;
// constructors
/// <summary>
/// Initializes a new instance of the BsonBinaryDataGuidGenerator class.
/// </summary>
/// <param name="guidRepresentation">The GuidRepresentation to use when generating new Id values.</param>
public BsonBinaryDataGuidGenerator(GuidRepresentation guidRepresentation)
{
_guidRepresentation = guidRepresentation;
}
// public static properties
/// <summary>
/// Gets an instance of BsonBinaryDataGuidGenerator for CSharpLegacy GuidRepresentation.
/// </summary>
public static BsonBinaryDataGuidGenerator CSharpLegacyInstance
{
get { return __csharpLegacyInstance; }
}
/// <summary>
/// Gets an instance of BsonBinaryDataGuidGenerator for JavaLegacy GuidRepresentation.
/// </summary>
public static BsonBinaryDataGuidGenerator JavaLegacyInstance
{
get { return __javaLegacyInstance; }
}
/// <summary>
/// Gets an instance of BsonBinaryDataGuidGenerator for PythonLegacy GuidRepresentation.
/// </summary>
public static BsonBinaryDataGuidGenerator PythonLegacyInstance
{
get { return __pythonLegacyInstance; }
}
/// <summary>
/// Gets an instance of BsonBinaryDataGuidGenerator for Standard GuidRepresentation.
/// </summary>
public static BsonBinaryDataGuidGenerator StandardInstance
{
get { return __standardInstance; }
}
/// <summary>
/// Gets an instance of BsonBinaryDataGuidGenerator for Unspecifed GuidRepresentation.
/// </summary>
public static BsonBinaryDataGuidGenerator UnspecifedInstance
{
get { return __unspecifiedInstance; }
}
// public properties
/// <summary>
/// Gets the Guid representation.
/// </summary>
public GuidRepresentation GuidRepresentation => _guidRepresentation;
// public static methods
/// <summary>
/// Gets the instance of BsonBinaryDataGuidGenerator for a GuidRepresentation.
/// </summary>
/// <param name="guidRepresentation">The GuidRepresentation.</param>
/// <returns>The instance of BsonBinaryDataGuidGenerator for a GuidRepresentation.</returns>
public static BsonBinaryDataGuidGenerator GetInstance(GuidRepresentation guidRepresentation)
{
switch (guidRepresentation)
{
case GuidRepresentation.CSharpLegacy: return __csharpLegacyInstance;
case GuidRepresentation.JavaLegacy: return __javaLegacyInstance;
case GuidRepresentation.PythonLegacy: return __pythonLegacyInstance;
case GuidRepresentation.Standard: return __standardInstance;
case GuidRepresentation.Unspecified: return __unspecifiedInstance;
default: throw new ArgumentOutOfRangeException("guidRepresentation");
}
}
// public methods
/// <summary>
/// Generates an Id for a document.
/// </summary>
/// <param name="container">The container of the document (will be a MongoCollection when called from the C# driver). </param>
/// <param name="document">The document.</param>
/// <returns>An Id.</returns>
public object GenerateId(object container, object document)
{
return new BsonBinaryData(Guid.NewGuid(), _guidRepresentation);
}
/// <summary>
/// Tests whether an Id is empty.
/// </summary>
/// <param name="id">The Id.</param>
/// <returns>True if the Id is empty.</returns>
public bool IsEmpty(object id)
{
if (id == null || ((BsonValue)id).IsBsonNull)
{
return true;
}
var idBsonBinaryData = (BsonBinaryData)id;
var subType = idBsonBinaryData.SubType;
if (subType != BsonBinarySubType.UuidLegacy && subType != BsonBinarySubType.UuidStandard)
{
throw new ArgumentOutOfRangeException("id", "The binary sub type of the id value passed to the BsonBinaryDataGuidGenerator IsEmpty method is not UuidLegacy or UuidStandard.");
}
return idBsonBinaryData.Bytes.SequenceEqual(__emptyGuidBytes);
}
}
}