Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel.Web/System/ServiceModel/Dispatcher/XmlFormatMapping.cs

@@ -0,0 +1,54 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel.Dispatcher
+{
+    using System.Collections.Generic;
+    using System.ServiceModel.Channels;
+    using System.ServiceModel.Web;
+    using System.Text;
+    using System.Xml;
+
+    class XmlFormatMapping : MultiplexingFormatMapping
+    {
+        public static readonly WebContentFormat WebContentFormat = WebContentFormat.Xml;
+        
+        internal static readonly string defaultMediaType = "application/xml";
+        static Dictionary<Encoding, MessageEncoder> encoders = new Dictionary<Encoding, MessageEncoder>();
+        static object thisLock = new object();
+
+        public XmlFormatMapping(Encoding writeEncoding, WebContentTypeMapper contentTypeMapper)
+            : base(writeEncoding, contentTypeMapper)
+        { }
+
+        public override WebContentFormat ContentFormat
+        {
+            get { return XmlFormatMapping.WebContentFormat; }
+        }
+
+        public override WebMessageFormat MessageFormat
+        {
+            get { return WebMessageFormat.Xml; }
+        }
+
+        public override string DefaultMediaType
+        {
+            get { return XmlFormatMapping.defaultMediaType; }
+        }
+
+        protected override MessageEncoder Encoder
+        {
+            get
+            {
+                lock (thisLock)
+                {
+                    if (!XmlFormatMapping.encoders.ContainsKey(this.writeEncoding))
+                    {
+                        XmlFormatMapping.encoders[this.writeEncoding] = new TextMessageEncoderFactory(MessageVersion.None, this.writeEncoding, 0, 0, new XmlDictionaryReaderQuotas()).Encoder;
+                    }
+                }
+                return XmlFormatMapping.encoders[this.writeEncoding];
+            }
+        }
+    }
+}