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/*
 * Copyright (C) 2011-2018 Rinde R.S. van Lon
 *
 * 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 com.github.rinde.rinsim.event;

import javax.annotation.Nullable;

import com.google.common.base.Optional;

/**
 * The base event class. It is immutable.
 * @author Rinde van Lon
 * @author Bartosz Michalik
 */
public class Event {

  /**
   * The type of event.
   */
  protected final Enum eventType;
  private final Optional