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BsonDocumentBackedClass.cs
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BsonDocumentBackedClass.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.Collections.Generic;
namespace MongoDB.Bson.Serialization
{
/// <summary>
/// A class backed by a BsonDocument.
/// </summary>
public abstract class BsonDocumentBackedClass
{
// private fields
private readonly BsonDocument _backingDocument;
private readonly IBsonDocumentSerializer _serializer;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="BsonDocumentBackedClass"/> class.
/// </summary>
/// <param name="serializer">The serializer.</param>
protected BsonDocumentBackedClass(IBsonDocumentSerializer serializer)
: this(new BsonDocument(), serializer)
{ }
/// <summary>
/// Initializes a new instance of the <see cref="BsonDocumentBackedClass"/> class.
/// </summary>
/// <param name="backingDocument">The backing document.</param>
/// <param name="serializer">The serializer.</param>
protected BsonDocumentBackedClass(BsonDocument backingDocument, IBsonDocumentSerializer serializer)
{
if (backingDocument == null)
{
throw new ArgumentNullException("backingDocument");
}
if (serializer == null)
{
throw new ArgumentNullException("serializer");
}
_backingDocument = backingDocument;
_serializer = serializer;
}
// protected internal properties
/// <summary>
/// Gets the backing document.
/// </summary>
protected internal BsonDocument BackingDocument
{
get { return _backingDocument; }
}
// protected methods
/// <summary>
/// Gets the value from the backing document.
/// </summary>
/// <typeparam name="T">The type of the value.</typeparam>
/// <param name="memberName">The member name.</param>
/// <returns>The value.</returns>
protected T GetValue<T>(string memberName)
{
BsonSerializationInfo info;
if (!_serializer.TryGetMemberSerializationInfo(memberName, out info))
{
var message = string.Format("The member {0} does not exist.", memberName);
throw new ArgumentException(message, "memberName");
}
BsonValue bsonValue;
if (!_backingDocument.TryGetValue(info.ElementName, out bsonValue))
{
var message = string.Format("The backing document does not contain an element named '{0}'.", info.ElementName);
throw new KeyNotFoundException(message);
}
return (T)info.DeserializeValue(bsonValue);
}
/// <summary>
/// Gets the value from the backing document.
/// </summary>
/// <typeparam name="T">The type of the value.</typeparam>
/// <param name="memberName">The member name.</param>
/// <param name="defaultValue">The default value.</param>
/// <returns>The value.</returns>
protected T GetValue<T>(string memberName, T defaultValue)
{
BsonSerializationInfo info;
if (!_serializer.TryGetMemberSerializationInfo(memberName, out info))
{
var message = string.Format("The member {0} does not exist.", memberName);
throw new ArgumentException(message, "memberName");
}
BsonValue bsonValue;
if (!_backingDocument.TryGetValue(info.ElementName, out bsonValue))
{
return defaultValue;
}
return (T)info.DeserializeValue(bsonValue);
}
/// <summary>
/// Sets the value in the backing document.
/// </summary>
/// <param name="memberName">The member name.</param>
/// <param name="value">The value.</param>
protected void SetValue(string memberName, object value)
{
BsonSerializationInfo info;
if (!_serializer.TryGetMemberSerializationInfo(memberName, out info))
{
var message = string.Format("The member {0} does not exist.", memberName);
throw new ArgumentException(message, "memberName");
}
var bsonValue = info.SerializeValue(value);
_backingDocument.Set(info.ElementName, bsonValue);
}
}
}