License and use of new ExtensionFormat

Signed-off-by: Fabio José <fabiojose@gmail.com>

api/src/main/java/io/cloudevents/v03/CloudEventImpl.java

@@ -1,3 +1,18 @@
+/**
+ * Copyright 2019 The CloudEvents Authors
+ *
+ * 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.
+ */
 package io.cloudevents.v03;
 
 import java.net.URI;
@@ -20,7 +35,8 @@ import com.fasterxml.jackson.annotation.JsonUnwrapped;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 
 import io.cloudevents.CloudEvent;
-import io.cloudevents.ExtensionFormat;
+import io.cloudevents.extensions.ExtensionFormat;
+import io.cloudevents.extensions.InMemoryFormat;
 
 /**
  * The event implementation
@@ -45,11 +61,10 @@ public class CloudEventImpl<T> implements CloudEvent<AttributesImpl, T> {
 		this.attributes = attributes;
 		this.data = data;
 		
-		this.extensions = extensions
+		this.extensions = extensions.stream()
-				.stream()
+				.map(ExtensionFormat::memory)
-				.collect(Collectors
+				.collect(Collectors.toMap(InMemoryFormat::getKey,
-						.toMap(ExtensionFormat::getKey,
+						InMemoryFormat::getValue));
-								ExtensionFormat::getExtension));
 	}
 
 	@JsonUnwrapped