Rename ICloudEventFormatter to CloudEventFormatter

While this could be CloudEventFormatterBase, it's probably clearer
as it is.

Signed-off-by: Jon Skeet <jonskeet@google.com>

src/CloudNative.CloudEvents.Amqp/AmqpClientExtensions.cs

@@ -20,7 +20,7 @@ namespace CloudNative.CloudEvents.Amqp
             message.ApplicationProperties.Map.ContainsKey(SpecVersionAmqpHeader);        
 
         public static CloudEvent ToCloudEvent(this Message message,
-            ICloudEventFormatter formatter,
+            CloudEventFormatter formatter,
             params CloudEventAttribute[] extensionAttributes)
         {
             if (HasCloudEventsContentType(message))

src/CloudNative.CloudEvents.Amqp/AmqpCloudEventMessage.cs

@@ -13,7 +13,7 @@ namespace CloudNative.CloudEvents.Amqp
 {
     public class AmqpCloudEventMessage : Message
     {
-        public AmqpCloudEventMessage(CloudEvent cloudEvent, ContentMode contentMode, ICloudEventFormatter formatter)
+        public AmqpCloudEventMessage(CloudEvent cloudEvent, ContentMode contentMode, CloudEventFormatter formatter)
         {
             ApplicationProperties = new ApplicationProperties();
             MapHeaders(cloudEvent);

src/CloudNative.CloudEvents.AspNetCore/CloudEventJsonInputFormatter.cs

@@ -16,9 +16,9 @@ namespace CloudNative.CloudEvents
 
     public class CloudEventJsonInputFormatter : TextInputFormatter
     {
-        private readonly ICloudEventFormatter _formatter;
+        private readonly CloudEventFormatter _formatter;
 
-        public CloudEventJsonInputFormatter(ICloudEventFormatter formatter)
+        public CloudEventJsonInputFormatter(CloudEventFormatter formatter)
         {
             _formatter = formatter;
             SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/json"));

src/CloudNative.CloudEvents.AspNetCore/HttpRequestExtension.cs

@@ -22,7 +22,7 @@ namespace CloudNative.CloudEvents
         /// <param name="extensions">List of extension instances</param>
         /// <returns>A CloudEvent instance or 'null' if the request message doesn't hold a CloudEvent</returns>
         public static async ValueTask<CloudEvent> ReadCloudEventAsync(this HttpRequest httpRequest,
-            ICloudEventFormatter formatter,
+            CloudEventFormatter formatter,
             params CloudEventAttribute[] extensionAttributes)
         {
             if (HasCloudEventsContentType(httpRequest))

src/CloudNative.CloudEvents.Avro/AvroEventFormatter.cs

@@ -16,7 +16,7 @@ namespace CloudNative.CloudEvents
     /// <summary>
     /// Formatter that implements the Avro Event Format
     /// </summary>
-    public class AvroEventFormatter : ICloudEventFormatter
+    public class AvroEventFormatter : CloudEventFormatter
     {
         private const string DataName = "data";
         private static readonly RecordSchema avroSchema;

src/CloudNative.CloudEvents.Kafka/KafkaClientExtensions.cs

@@ -20,11 +20,11 @@ namespace CloudNative.CloudEvents.Kafka
             (ExtractContentType(message)?.StartsWith(CloudEvent.MediaType, StringComparison.InvariantCultureIgnoreCase) == true);
 
         public static CloudEvent ToCloudEvent(this Message<string, byte[]> message,
-            ICloudEventFormatter eventFormatter, params CloudEventAttribute[] extensionAttributes) =>
+            CloudEventFormatter eventFormatter, params CloudEventAttribute[] extensionAttributes) =>
             ToCloudEvent(message, eventFormatter, (IEnumerable<CloudEventAttribute>) extensionAttributes);
 
         public static CloudEvent ToCloudEvent(this Message<string, byte[]> message,
-            ICloudEventFormatter eventFormatter, IEnumerable<CloudEventAttribute> extensionAttributes)
+            CloudEventFormatter eventFormatter, IEnumerable<CloudEventAttribute> extensionAttributes)
         {
             if (!IsCloudEvent(message))
             {

src/CloudNative.CloudEvents.Kafka/KafkaCloudEventMessage.cs

@@ -18,7 +18,7 @@ namespace CloudNative.CloudEvents.Kafka
         internal const string KafkaContentTypeAttributeName = "content-type";
         internal const string SpecVersionKafkaHeader = KafkaHeaderPrefix + "specversion";
 
-        public KafkaCloudEventMessage(CloudEvent cloudEvent, ContentMode contentMode, ICloudEventFormatter formatter)
+        public KafkaCloudEventMessage(CloudEvent cloudEvent, ContentMode contentMode, CloudEventFormatter formatter)
         {
             // TODO: Is this appropriate? Why can't we transport a CloudEvent without data in Kafka?
             if (cloudEvent.Data == null)
@@ -70,7 +70,7 @@ namespace CloudNative.CloudEvents.Kafka
             MapHeaders(cloudEvent, formatter);
         }
 
-        private void MapHeaders(CloudEvent cloudEvent, ICloudEventFormatter formatter)
+        private void MapHeaders(CloudEvent cloudEvent, CloudEventFormatter formatter)
         {
 
             foreach (var pair in cloudEvent.GetPopulatedAttributes())

src/CloudNative.CloudEvents.Mqtt/MqttClientExtensions.cs

@@ -9,7 +9,7 @@ namespace CloudNative.CloudEvents.Mqtt
     public static class MqttClientExtensions
     {
         public static CloudEvent ToCloudEvent(this MqttApplicationMessage message,
-            ICloudEventFormatter eventFormatter, params CloudEventAttribute[] extensionAttributes)
+            CloudEventFormatter eventFormatter, params CloudEventAttribute[] extensionAttributes)
         {
             return eventFormatter.DecodeStructuredEvent(message.Payload, extensionAttributes);
         }

src/CloudNative.CloudEvents.Mqtt/MqttCloudEventMessage.cs

@@ -9,7 +9,7 @@ namespace CloudNative.CloudEvents.Mqtt
     // TODO: Update to a newer version of MQTTNet and support both binary and structured mode?
     public class MqttCloudEventMessage : MqttApplicationMessage
     {
-        public MqttCloudEventMessage(CloudEvent cloudEvent, ICloudEventFormatter formatter)
+        public MqttCloudEventMessage(CloudEvent cloudEvent, CloudEventFormatter formatter)
         {
             this.Payload = formatter.EncodeStructuredEvent(cloudEvent, out var contentType);
         }

src/CloudNative.CloudEvents.NewtonsoftJson/JsonEventFormatter.cs

@@ -16,7 +16,7 @@ namespace CloudNative.CloudEvents.NewtonsoftJson
     /// <summary>
     /// Formatter that implements the JSON Event Format
     /// </summary>
-    public class JsonEventFormatter : ICloudEventFormatter
+    public class JsonEventFormatter : CloudEventFormatter
     {
         private const string DataBase64 = "data_base64";
         private const string Data = "data";

src/CloudNative.CloudEvents/CloudEventFormatter.cs

@@ -13,7 +13,7 @@ namespace CloudNative.CloudEvents
     /// <summary>
     /// Implemented by formatters
     /// </summary>
-    public abstract class ICloudEventFormatter
+    public abstract class CloudEventFormatter
     {
         /// <summary>
         /// Decode a structured event from a stream

src/CloudNative.CloudEvents/Http/CloudEventHttpContent.cs

@@ -26,7 +26,7 @@ namespace CloudNative.CloudEvents.Http
         /// <param name="cloudEvent">CloudEvent</param>
         /// <param name="contentMode">Content mode. Structured or binary.</param>
         /// <param name="formatter">Event formatter</param>
-        public CloudEventHttpContent(CloudEvent cloudEvent, ContentMode contentMode, ICloudEventFormatter formatter)
+        public CloudEventHttpContent(CloudEvent cloudEvent, ContentMode contentMode, CloudEventFormatter formatter)
         {
             if (contentMode == ContentMode.Structured)
             {

src/CloudNative.CloudEvents/Http/HttpClientExtensions.cs

@@ -80,7 +80,7 @@ namespace CloudNative.CloudEvents.Http
         /// <param name="extensionAttributes">The extension attributes to use when parsing the CloudEvent.</param>
         /// <returns>A CloudEvent instance or 'null' if the response message doesn't hold a CloudEvent</returns>
         public static Task<CloudEvent> ToCloudEventAsync(this HttpResponseMessage httpResponseMessage,
-            ICloudEventFormatter formatter, params CloudEventAttribute[] extensionAttributes) =>
+            CloudEventFormatter formatter, params CloudEventAttribute[] extensionAttributes) =>
             ToCloudEventInternalAsync(httpResponseMessage.Headers, httpResponseMessage.Content, formatter, extensionAttributes);
 
         /// <summary>
@@ -91,12 +91,12 @@ namespace CloudNative.CloudEvents.Http
         /// <param name="extensionAttributes">List of extension instances</param>
         /// <returns>A CloudEvent instance or 'null' if the request message doesn't hold a CloudEvent</returns>
         public static Task<CloudEvent> ToCloudEventAsync(this HttpRequestMessage httpRequestMessage,
-            ICloudEventFormatter formatter,
+            CloudEventFormatter formatter,
             params CloudEventAttribute[] extensionAttributes) =>
             ToCloudEventInternalAsync(httpRequestMessage.Headers, httpRequestMessage.Content, formatter, extensionAttributes);
 
         private static async Task<CloudEvent> ToCloudEventInternalAsync(HttpHeaders headers, HttpContent content,
-            ICloudEventFormatter formatter, IEnumerable<CloudEventAttribute> extensionAttributes)
+            CloudEventFormatter formatter, IEnumerable<CloudEventAttribute> extensionAttributes)
         {
             if (HasCloudEventsContentType(content))
             {

src/CloudNative.CloudEvents/Http/HttpListenerExtensions.cs

@@ -26,7 +26,7 @@ namespace CloudNative.CloudEvents.Http
         /// <param name="formatter">Formatter</param>
         /// <returns>Task</returns>
         public static Task CopyFromAsync(this HttpListenerResponse httpListenerResponse, CloudEvent cloudEvent,
-            ContentMode contentMode, ICloudEventFormatter formatter)
+            ContentMode contentMode, CloudEventFormatter formatter)
         {
             if (contentMode == ContentMode.Structured)
             {
@@ -99,7 +99,7 @@ namespace CloudNative.CloudEvents.Http
         /// <param name="extensions">List of extension instances</param>
         /// <returns>A CloudEvent instance or 'null' if the request message doesn't hold a CloudEvent</returns>
         public static CloudEvent ToCloudEvent(this HttpListenerRequest httpListenerRequest,
-            ICloudEventFormatter formatter, params CloudEventAttribute[] extensionAttributes)
+            CloudEventFormatter formatter, params CloudEventAttribute[] extensionAttributes)
         {
             if (HasCloudEventsContentType(httpListenerRequest))
             {

src/CloudNative.CloudEvents/Http/HttpUtilities.cs

@@ -21,7 +21,7 @@ namespace CloudNative.CloudEvents.Http
 
         public const string SpecVersionHttpHeader = HttpHeaderPrefix + "specversion";
 
-        internal static Stream MapDataAttributeToStream(CloudEvent cloudEvent, ICloudEventFormatter formatter) =>
+        internal static Stream MapDataAttributeToStream(CloudEvent cloudEvent, CloudEventFormatter formatter) =>
             cloudEvent.Data switch
             {
                 byte[] bytes => new MemoryStream(bytes),

src/CloudNative.CloudEvents/Http/HttpWebExtensions.cs

@@ -25,7 +25,7 @@ namespace CloudNative.CloudEvents.Http
         /// <param name="formatter">Formatter</param>
         /// <returns>Task</returns>
         public static async Task CopyFromAsync(this HttpWebRequest httpWebRequest, CloudEvent cloudEvent,
-            ContentMode contentMode, ICloudEventFormatter formatter)
+            ContentMode contentMode, CloudEventFormatter formatter)
         {
             if (contentMode == ContentMode.Structured)
             {