package io.cloudevents.v02;

import java.util.Collection;
import java.util.Objects;
import java.util.Set;

import io.cloudevents.Attributes;
import io.cloudevents.CloudEvent;
import io.cloudevents.extensions.ExtensionFormat;

/**
 * 
 * @author fabiojose
 *
 */
public final class Accessor {

	/**
	 * To get access the set of {@link ExtensionFormat} inside the 
	 * event.
	 * 
	 * @param cloudEvent
	 * @throws IllegalArgumentException When argument is not an instance of {@link CloudEventImpl}
	 */
	public static <A extends Attributes, T> Collection<ExtensionFormat> 
		extensionsOf(CloudEvent<A, T> cloudEvent) {
		Objects.requireNonNull(cloudEvent);
		
		if(cloudEvent instanceof CloudEventImpl) {
			CloudEventImpl impl = (CloudEventImpl)cloudEvent;
			return impl.getExtensionsFormats();
		}
		
		throw new IllegalArgumentException("Invalid instance type: " 
				+ cloudEvent.getClass());
	}
}

@@ -1,8 +1,612 @@
+/**%0A * Copyright 2019 The CloudEvents Authors%0A *%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A * http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A
 package 
@@ -655,16 +655,16 @@
 ection;%0A
+
 import j
@@ -684,30 +684,8 @@
 cts;
-%0Aimport java.util.Set;
 %0A%0Aim

set import, Add: license