WebMessageEncoderFactory.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / NetFx35 / System.ServiceModel.Web / System / ServiceModel / Channels / WebMessageEncoderFactory.cs / 1 / WebMessageEncoderFactory.cs
                        
                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.ServiceModel.Channels 
{
    using System; 
    using System.Collections.Generic; 
    using System.Globalization;
    using System.IO; 
    using System.Net.Mime;
    using System.ServiceModel.Diagnostics;
    using System.Text;
    using System.Xml; 
    using System.Net;
    using System.ServiceModel.Web; 
 
    class WebMessageEncoderFactory : MessageEncoderFactory
    { 
        WebMessageEncoder messageEncoder;

        public WebMessageEncoderFactory(Encoding writeEncoding, int maxReadPoolSize, int maxWritePoolSize, XmlDictionaryReaderQuotas quotas, WebContentTypeMapper contentTypeMapper)
        { 
            messageEncoder = new WebMessageEncoder(writeEncoding, maxReadPoolSize, maxWritePoolSize, quotas, contentTypeMapper);
        } 
 
        public override MessageEncoder Encoder
        { 
            get { return messageEncoder; }
        }

        public override MessageVersion MessageVersion 
        {
            get { return messageEncoder.MessageVersion; } 
        } 

        class WebMessageEncoder : MessageEncoder 
        {
            const string defaultMediaType = "application/xml";
            WebContentTypeMapper contentTypeMapper;
            string defaultContentType; 
            MessageEncoder jsonMessageEncoder;
            int maxReadPoolSize; 
            int maxWritePoolSize; 
            MessageEncoder rawMessageEncoder;
            XmlDictionaryReaderQuotas readerQuotas; 
            MessageEncoder textMessageEncoder;
            object thisLock;
            Encoding writeEncoding;
 
            public WebMessageEncoder(Encoding writeEncoding, int maxReadPoolSize, int maxWritePoolSize, XmlDictionaryReaderQuotas quotas, WebContentTypeMapper contentTypeMapper)
            { 
                if (writeEncoding == null) 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("writeEncoding"); 
                }

                this.thisLock = new object();
 
                TextEncoderDefaults.ValidateEncoding(writeEncoding);
                this.writeEncoding = writeEncoding; 
 
                this.maxReadPoolSize = maxReadPoolSize;
                this.maxWritePoolSize = maxWritePoolSize; 
                this.contentTypeMapper = contentTypeMapper;

                this.readerQuotas = new XmlDictionaryReaderQuotas();
                quotas.CopyTo(this.readerQuotas); 

                this.defaultContentType = String.Format(CultureInfo.InvariantCulture, "{0}; charset={1}", defaultMediaType, TextEncoderDefaults.EncodingToCharSet(writeEncoding)); 
            } 

            public override string ContentType 
            {
                get { return this.defaultContentType; }
            }
 
            public override string MediaType
            { 
                get { return defaultMediaType; } 
            }
 
            public override MessageVersion MessageVersion
            {
                get { return MessageVersion.None; }
            } 

            MessageEncoder JsonMessageEncoder 
            { 
                get
                { 
                    if (jsonMessageEncoder == null)
                    {
                        lock (ThisLock)
                        { 
                            if (jsonMessageEncoder == null)
                            { 
                                jsonMessageEncoder = new JsonMessageEncoderFactory(writeEncoding, maxReadPoolSize, maxWritePoolSize, readerQuotas).Encoder; 
                            }
                        } 
                    }
                    return jsonMessageEncoder;
                }
            } 

            MessageEncoder RawMessageEncoder 
            { 
                get
                { 
                    if (rawMessageEncoder == null)
                    {
                        lock (ThisLock)
                        { 
                            if (rawMessageEncoder == null)
                            { 
                                rawMessageEncoder = new HttpStreamMessageEncoderFactory(readerQuotas).Encoder; 
                            }
                        } 
                    }
                    return rawMessageEncoder;
                }
            } 

            MessageEncoder TextMessageEncoder 
            { 
                get
                { 
                    if (textMessageEncoder == null)
                    {
                        lock (ThisLock)
                        { 
                            if (textMessageEncoder == null)
                            { 
                                textMessageEncoder = new TextMessageEncoderFactory(MessageVersion.None, writeEncoding, maxReadPoolSize, maxWritePoolSize, readerQuotas).Encoder; 
                            }
                        } 
                    }
                    return textMessageEncoder;
                }
            } 

            object ThisLock 
            { 
                get { return thisLock; }
            } 

            public override bool IsContentTypeSupported(string contentType)
            {
                if (contentType == null) 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contentType"); 
                } 

                WebContentFormat messageFormat; 
                if (TryGetContentTypeMapping(contentType, out messageFormat) &&
                    (messageFormat != WebContentFormat.Default))
                {
                    return true; 
                }
 
                return RawMessageEncoder.IsContentTypeSupported(contentType) || JsonMessageEncoder.IsContentTypeSupported(contentType) || TextMessageEncoder.IsContentTypeSupported(contentType); 
            }
 
            public override Message ReadMessage(ArraySegment buffer, BufferManager bufferManager, string contentType)
            {
                if (bufferManager == null)
                { 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("bufferManager"));
                } 
 
                WebContentFormat format = GetFormatForContentType(contentType);
                Message message; 

                switch (format)
                {
                    case WebContentFormat.Json: 
                        message = JsonMessageEncoder.ReadMessage(buffer, bufferManager, contentType);
                        message.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.JsonProperty); 
                        break; 
                    case WebContentFormat.Xml:
                        message = TextMessageEncoder.ReadMessage(buffer, bufferManager, contentType); 
                        message.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.XmlProperty);
                        break;
                    case WebContentFormat.Raw:
                        message = RawMessageEncoder.ReadMessage(buffer, bufferManager, contentType); 
                        message.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.RawProperty);
                        break; 
                    default: 
                        Fx.Assert("This should never get hit because GetFormatForContentType shouldn't return a WebContentFormat other than Json, Xml, and Raw");
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperInternal(false); 
                }
                return message;
            }
 
            public override Message ReadMessage(Stream stream, int maxSizeOfHeaders, string contentType)
            { 
                if (stream == null) 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("stream")); 
                }

                WebContentFormat format = GetFormatForContentType(contentType);
                Message message; 
                switch (format)
                { 
                    case WebContentFormat.Json: 
                        message = JsonMessageEncoder.ReadMessage(stream, maxSizeOfHeaders, contentType);
                        message.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.JsonProperty); 
                        break;
                    case WebContentFormat.Xml:
                        message = TextMessageEncoder.ReadMessage(stream, maxSizeOfHeaders, contentType);
                        message.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.XmlProperty); 
                        break;
                    case WebContentFormat.Raw: 
                        message = RawMessageEncoder.ReadMessage(stream, maxSizeOfHeaders, contentType); 
                        message.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.RawProperty);
                        break; 
                    default:
                        Fx.Assert("This should never get hit because GetFormatForContentType shouldn't return a WebContentFormat other than Json, Xml, and Raw");
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperInternal(false);
                } 
                return message;
            } 
 
            public override ArraySegment WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, int messageOffset)
            { 
                if (message == null)
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("message"));
                } 
                if (bufferManager == null)
                { 
                    throw TraceUtility.ThrowHelperError(new ArgumentNullException("bufferManager"), message); 
                }
                if (maxMessageSize < 0) 
                {
                    throw TraceUtility.ThrowHelperError(new ArgumentOutOfRangeException("maxMessageSize", maxMessageSize,
                        SR2.GetString(SR2.ValueMustBeNonNegative)), message);
                } 
                if (messageOffset < 0 || messageOffset > maxMessageSize)
                { 
                    throw TraceUtility.ThrowHelperError(new ArgumentOutOfRangeException("messageOffset", messageOffset, 
                        SR2.GetString(SR2.JsonValueMustBeInRange, 0, maxMessageSize)), message);
                } 
                ThrowIfMismatchedMessageVersion(message);

                WebContentFormat messageFormat = ExtractFormatFromMessage(message);
                switch (messageFormat) 
                {
                    case WebContentFormat.Json: 
                        return JsonMessageEncoder.WriteMessage(message, maxMessageSize, bufferManager, messageOffset); 
                    case WebContentFormat.Xml:
                        return TextMessageEncoder.WriteMessage(message, maxMessageSize, bufferManager, messageOffset); 
                    case WebContentFormat.Raw:
                        return RawMessageEncoder.WriteMessage(message, maxMessageSize, bufferManager, messageOffset);
                    default:
                        Fx.Assert("This should never get hit because GetFormatForContentType shouldn't return a WebContentFormat other than Json, Xml, and Raw"); 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperInternal(false);
                } 
            } 

            public override void WriteMessage(Message message, Stream stream) 
            {
                if (message == null)
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("message")); 
                }
                if (stream == null) 
                { 
                    throw TraceUtility.ThrowHelperError(new ArgumentNullException("stream"), message);
                } 
                ThrowIfMismatchedMessageVersion(message);

                WebContentFormat messageFormat = ExtractFormatFromMessage(message);
                switch (messageFormat) 
                {
                    case WebContentFormat.Json: 
                        JsonMessageEncoder.WriteMessage(message, stream); 
                        break;
                    case WebContentFormat.Xml: 
                        TextMessageEncoder.WriteMessage(message, stream);
                        break;
                    case WebContentFormat.Raw:
                        RawMessageEncoder.WriteMessage(message, stream); 
                        break;
                    default: 
                        Fx.Assert("This should never get hit because GetFormatForContentType shouldn't return a WebContentFormat other than Json, Xml, and Raw"); 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperInternal(false);
                } 
            }

            internal override bool IsCharSetSupported(string charSet)
            { 
                Encoding tmp;
                return TextEncoderDefaults.TryGetEncoding(charSet, out tmp); 
            } 

            WebContentFormat ExtractFormatFromMessage(Message message) 
            {
                object messageFormatProperty;
                message.Properties.TryGetValue(WebBodyFormatMessageProperty.Name, out messageFormatProperty);
                if (messageFormatProperty == null) 
                {
                    return WebContentFormat.Xml; 
                } 

                WebBodyFormatMessageProperty typedMessageFormatProperty = messageFormatProperty as WebBodyFormatMessageProperty; 
                if ((typedMessageFormatProperty == null) ||
                    (typedMessageFormatProperty.Format == WebContentFormat.Default))
                {
                    return WebContentFormat.Xml; 
                }
 
                return typedMessageFormatProperty.Format; 
            }
 
            WebContentFormat GetFormatForContentType(string contentType)
            {
                WebContentFormat messageFormat;
 
                if (TryGetContentTypeMapping(contentType, out messageFormat) &&
                    (messageFormat != WebContentFormat.Default)) 
                { 
                    return messageFormat;
                } 

                // Don't pass on null content types to IsContentTypeSupported methods -- they might throw.
                // If null content type isn't already mapped, return the default format of Raw.
                if (contentType == null) 
                {
                    return WebContentFormat.Raw; 
                } 

                if (JsonMessageEncoder.IsContentTypeSupported(contentType)) 
                {
                    return WebContentFormat.Json;
                }
                if (TextMessageEncoder.IsContentTypeSupported(contentType)) 
                {
                    return WebContentFormat.Xml; 
                } 

                return WebContentFormat.Raw; 
            }

            bool TryGetContentTypeMapping(string contentType, out WebContentFormat format)
            { 
                if (contentTypeMapper == null)
                { 
                    format = WebContentFormat.Default; 
                    return false;
                } 

                try
                {
                    format = contentTypeMapper.GetMessageFormatForContentType(contentType); 
                    if (!WebContentFormatHelper.IsDefined(format))
                    { 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR2.GetString(SR2.UnknownWebEncodingFormat, contentType, format))); 
                    }
                    return true; 
                }
                catch (Exception e)
                {
                    if (DiagnosticUtility.IsFatal(e)) 
                    {
                        throw; 
                    } 

                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CommunicationException( 
                        SR2.GetString(SR2.ErrorEncounteredInContentTypeMapper), e));
                }
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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WebMessageEncoderFactory.cs source code in C# .NET

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