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ObjectIdGenerator.cs
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ObjectIdGenerator.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.
*/
namespace MongoDB.Bson.Serialization.IdGenerators
{
/// <summary>
/// Represents an Id generator for ObjectIds.
/// </summary>
public class ObjectIdGenerator : IIdGenerator
{
// private static fields
private static ObjectIdGenerator __instance = new ObjectIdGenerator();
// constructors
/// <summary>
/// Initializes a new instance of the ObjectIdGenerator class.
/// </summary>
public ObjectIdGenerator()
{
}
// public static properties
/// <summary>
/// Gets an instance of ObjectIdGenerator.
/// </summary>
public static ObjectIdGenerator Instance
{
get { return __instance; }
}
// 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 ObjectId.GenerateNewId();
}
/// <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)
{
return id == null || (ObjectId)id == ObjectId.Empty;
}
}
}