/****************************************************************************
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**
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** Copyright (C) 2018 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt VS Tools.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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using System;
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using System.CodeDom;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Reflection;
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using System.Runtime.Serialization;
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using System.Runtime.Serialization.Json;
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using System.Text;
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using System.Xml;
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using QtVsTools.Core;
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/// <summary>
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/// The classes in this namespace provide support to the serialization and deserialization of
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/// .NET objects using the JavaScript Object Notation (JSON) format. The transformation of
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/// objects to and from JSON data is based on the DataContractJsonSerializer class provided
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/// by the .NET framework, as documented in the following page:
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///
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/// https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/how-to-serialize-and-deserialize-json-data
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///
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/// To support the deserialization of polymorphic types, the concept of deferred deserialization
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/// is introduced: if a field is marked for deferred deserialization, the corresponding JSON data
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/// is not interpreted right way, but is rather stored for later processing, e.g. when the actual
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/// type of the field can be determined.
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/// </summary>
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///
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namespace QtVsTools.Json
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{
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/// <summary>
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/// Public interface of objects representing JSON serialized data
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/// </summary>
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///
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public interface IJsonData : IDisposable
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{
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bool IsEmpty();
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byte[] GetBytes();
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}
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/// <summary>
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/// Public interface of types providing deferred deserialization.
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/// </summary>
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///
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public interface IDeferredObject
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{
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object Object { get; }
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bool HasData { get; }
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void Deserialize();
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}
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/// <summary>
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/// Public interface of types containing deferred-deserialized objects
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/// </summary>
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///
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public interface IDeferredObjectContainer
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{
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void Add(IDeferredObject defObj);
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IEnumerable<IDeferredObject> PendingObjects { get; }
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}
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/// <summary>
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/// A Serializer object allows the serialization and deserialization of objects using the JSON
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/// format, by extending the services provided by the DataContractJsonSerializer class.
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/// </summary>
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///
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class Serializer : Concurrent
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{
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private DataContractJsonSerializer serializer;
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public static Serializer Create(Type type)
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{
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var _this = new Serializer();
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return _this.Initialize(type) ? _this : null;
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}
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private Serializer()
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{ }
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private bool Initialize(Type type)
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{
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var settings = new DataContractJsonSerializerSettings();
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if (settings == null)
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return false;
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settings.DataContractSurrogate = new DataContractSurrogate { Serializer = this };
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settings.EmitTypeInformation = EmitTypeInformation.Never;
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settings.UseSimpleDictionaryFormat = true;
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serializer = new DataContractJsonSerializer(type, settings);
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if (serializer == null)
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return false;
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return true;
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}
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public IJsonData Serialize(object obj)
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{
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var stream = new MemoryStream();
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using (var writer = JsonReaderWriterFactory.CreateJsonWriter(stream)) {
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try {
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serializer.WriteObject(writer, obj);
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writer.Close();
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return new JsonData() { Stream = stream };
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} catch (Exception exception) {
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exception.Log();
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if (stream != null && stream.CanRead && stream.Length > 0)
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stream.Dispose();
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return null;
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}
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}
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}
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public object Deserialize(IJsonData jsonData)
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{
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var data = jsonData as JsonData;
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if (data == null)
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return null;
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if (data.XmlStream == null && !Parse(data))
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return null;
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lock (CriticalSection) {
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try {
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using (reader = XmlReader.Create(data.XmlStream)) {
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var obj = serializer.ReadObject(reader, false);
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if (obj is IDeferredObjectContainer container)
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deferredObjects.ForEach(x => container.Add(x));
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return obj;
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}
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} catch (Exception exception) {
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exception.Log();
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return null;
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} finally {
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reader = null;
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deferredObjects.Clear();
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data.XmlStream.Position = 0;
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}
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}
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}
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/// <summary>
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/// Parses raw JSON data and returns the corresponding IJsonData object.
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/// </summary>
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/// <param name="rawJsonData">Raw JSON data</param>
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/// <returns>IJsonData object corresponding to the data provided</returns>
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///
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public static IJsonData Parse(byte[] rawJsonData)
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{
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if (rawJsonData == null)
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rawJsonData = new byte[0];
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var data = new JsonData()
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{
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Stream = new MemoryStream(rawJsonData)
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};
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if (!Parse(data)) {
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data.Dispose();
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return null;
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}
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return data;
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}
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private static bool Parse(JsonData data)
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{
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try {
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var q = new XmlDictionaryReaderQuotas();
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using (var reader = JsonReaderWriterFactory.CreateJsonReader(data.Stream, q)) {
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reader.Read();
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var xmlData = Encoding.UTF8.GetBytes(reader.ReadOuterXml());
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reader.Close();
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data.XmlStream = new MemoryStream(xmlData);
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}
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return true;
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} catch (Exception exception) {
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exception.Log();
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return false;
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}
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}
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#region //////////////////// JsonData /////////////////////////////////////////////////////
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private class JsonData : Disposable, IJsonData
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{
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public MemoryStream Stream { get; set; }
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public MemoryStream XmlStream { get; set; }
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byte[] IJsonData.GetBytes()
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{
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return Stream.ToArray();
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}
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bool IJsonData.IsEmpty()
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{
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return (Stream == null || !Stream.CanRead || Stream.Length == 0)
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&& (XmlStream == null || !XmlStream.CanRead || XmlStream.Length == 0);
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}
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protected override void DisposeManaged()
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{
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if (Stream != null)
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Stream.Dispose();
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if (XmlStream != null)
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XmlStream.Dispose();
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}
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}
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#endregion //////////////////// JsonData //////////////////////////////////////////////////
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#region //////////////////// Data Contract Surrogate //////////////////////////////////////
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static readonly Exclusive<Serializer> sharedInstance = new Exclusive<Serializer>();
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private XmlReader reader = null;
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private readonly List<IDeferredObject> deferredObjects = new List<IDeferredObject>();
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public static IJsonData GetCurrentJsonData()
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{
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Serializer _this = sharedInstance;
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try {
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var root = new StringBuilder();
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root.Append("<root type=\"object\">");
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while (_this.reader.IsStartElement())
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root.Append(_this.reader.ReadOuterXml());
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root.Append("</root>");
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var xmlData = Encoding.UTF8.GetBytes(root.ToString());
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return new JsonData { XmlStream = new MemoryStream(xmlData) };
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} catch (Exception exception) {
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exception.Log();
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return null;
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}
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}
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class DataContractSurrogate : IDataContractSurrogate
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{
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public Serializer Serializer { get; set; }
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Type IDataContractSurrogate.GetDataContractType(Type type)
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{
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if (typeof(IDeferredObject).IsAssignableFrom(type)) {
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// About to process a deferred object: lock shared serializer
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sharedInstance.Set(Serializer);
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}
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return type;
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}
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object IDataContractSurrogate.GetDeserializedObject(object obj, Type targetType)
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{
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if (typeof(IDeferredObject).IsAssignableFrom(targetType)) {
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// Deferred object deserialized: add to list of deferred objects...
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Serializer.deferredObjects.Add(obj as IDeferredObject);
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// ...and release shared serializer
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sharedInstance.Release();
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}
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return obj;
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}
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object IDataContractSurrogate.GetObjectToSerialize(object obj, Type targetType)
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{
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if (obj is IDeferredObject) {
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// Deferred object serialized: release shared serializer
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sharedInstance.Release();
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return (obj as IDeferredObject).Object;
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}
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return obj;
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}
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object IDataContractSurrogate.GetCustomDataToExport(
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MemberInfo memberInfo,
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Type dataContractType)
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{ throw new NotImplementedException(); }
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object IDataContractSurrogate.GetCustomDataToExport(
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Type clrType,
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Type dataContractType)
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{ throw new NotImplementedException(); }
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Type IDataContractSurrogate.GetReferencedTypeOnImport(
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string typeName,
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string typeNamespace,
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object customData)
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{ throw new NotImplementedException(); }
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CodeTypeDeclaration IDataContractSurrogate.ProcessImportedType(
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CodeTypeDeclaration typeDeclaration,
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CodeCompileUnit compileUnit)
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{ throw new NotImplementedException(); }
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void IDataContractSurrogate.GetKnownCustomDataTypes(Collection<Type> customDataTypes)
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{ throw new NotImplementedException(); }
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}
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#endregion //////////////////// Data Contract Surrogate ///////////////////////////////////
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}
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}
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