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LazyBsonArray.cs
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LazyBsonArray.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;
using System.Collections.Generic;
using System.IO;
using MongoDB.Bson.IO;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Attributes;
using MongoDB.Bson.Serialization.Serializers;
namespace MongoDB.Bson
{
/// <summary>
/// Represents a BSON array that is deserialized lazily.
/// </summary>
[BsonSerializer(typeof(LazyBsonArraySerializer))]
public class LazyBsonArray : MaterializedOnDemandBsonArray
{
// private fields
private IByteBuffer _slice;
private List<IDisposable> _disposableItems = new List<IDisposable>();
private BsonBinaryReaderSettings _readerSettings = BsonBinaryReaderSettings.Defaults;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="LazyBsonArray"/> class.
/// </summary>
/// <param name="slice">The slice.</param>
/// <exception cref="System.ArgumentNullException">slice</exception>
/// <exception cref="System.ArgumentException">LazyBsonArray cannot be used with an IByteBuffer that needs disposing.</exception>
public LazyBsonArray(IByteBuffer slice)
{
if (slice == null)
{
throw new ArgumentNullException("slice");
}
_slice = slice;
}
// public properties
/// <summary>
/// Gets the slice.
/// </summary>
/// <value>
/// The slice.
/// </value>
public IByteBuffer Slice
{
get { return _slice; }
}
/// <summary>
/// Creates a shallow clone of the array (see also DeepClone).
/// </summary>
/// <returns>A shallow clone of the array.</returns>
public override BsonValue Clone()
{
if (_slice != null)
{
return new LazyBsonArray(CloneSlice());
}
else
{
return base.Clone();
}
}
/// <summary>
/// Creates a deep clone of the array (see also Clone).
/// </summary>
/// <returns>A deep clone of the array.</returns>
public override BsonValue DeepClone()
{
if (_slice != null)
{
return new LazyBsonArray(CloneSlice());
}
else
{
return base.Clone();
}
}
// protected methods
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected override void Dispose(bool disposing)
{
if (!IsDisposed)
{
if (disposing)
{
if (_slice != null)
{
_slice.Dispose();
_slice = null;
}
if (_disposableItems != null)
{
_disposableItems.ForEach(x => x.Dispose());
_disposableItems = null;
}
}
}
base.Dispose(disposing);
}
/// <summary>
/// Materializes the BsonArray.
/// </summary>
/// <returns>
/// The materialized values.
/// </returns>
protected override IEnumerable<BsonValue> Materialize()
{
return MaterializeThisLevel();
}
/// <summary>
/// Informs subclasses that the Materialize process completed so they can free any resources related to the unmaterialized state.
/// </summary>
protected override void MaterializeCompleted()
{
var slice = _slice;
_slice = null;
slice.Dispose();
}
// private methods
private IByteBuffer CloneSlice()
{
return _slice.GetSlice(0, _slice.Length);
}
private LazyBsonArray DeserializeLazyBsonArray(BsonBinaryReader bsonReader)
{
var slice = bsonReader.ReadRawBsonArray();
var nestedArray = new LazyBsonArray(slice);
_disposableItems.Add(nestedArray);
return nestedArray;
}
private LazyBsonDocument DeserializeLazyBsonDocument(BsonBinaryReader bsonReader)
{
var slice = bsonReader.ReadRawBsonDocument();
var nestedDocument = new LazyBsonDocument(slice);
_disposableItems.Add(nestedDocument);
return nestedDocument;
}
private IEnumerable<BsonValue> MaterializeThisLevel()
{
var values = new List<BsonValue>();
using (var stream = new ByteBufferStream(_slice, ownsBuffer: false))
using (var bsonReader = new BsonBinaryReader(stream, _readerSettings))
{
var context = BsonDeserializationContext.CreateRoot(bsonReader);
bsonReader.ReadStartDocument();
BsonType bsonType;
while ((bsonType = bsonReader.ReadBsonType()) != BsonType.EndOfDocument)
{
bsonReader.SkipName();
BsonValue value;
switch (bsonType)
{
case BsonType.Array: value = DeserializeLazyBsonArray(bsonReader); break;
case BsonType.Document: value = DeserializeLazyBsonDocument(bsonReader); break;
default: value = BsonValueSerializer.Instance.Deserialize(context); break;
}
values.Add(value);
}
bsonReader.ReadEndDocument();
}
return values;
}
}
}