content: /*
   * Copyright 2019-2023 Adaptive Financial Consulting Ltd.
   *
   * 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
   *
   * https://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.aeroncookbook.rsm;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SimpleStateMachine
  {
      private int currentValue = 0;
      private final List<EventListener> eventListeners = new ArrayList<>();
  
      public void addListener(final EventListener eventListener)
      {
          eventListeners.add(eventListener);
      }
  
      public void add(final AddCommand addCommand)
      {
          currentValue += addCommand.value;
          notifyListeners();
      }
  
      public void multiply(final MultiplyCommand multiplyCommand)
      {
          currentValue *= multiplyCommand.value;
          notifyListeners();
      }
  
      public void set(final SetCommand setCommand)
      {
          currentValue = setCommand.value;
          notifyListeners();
      }
  
      public void snapshot(final SnapshotCommand snapshotCommand)
      {
          notifyListeners();
      }
  
      private void notifyListeners()
      {
          final NewValueEvent newValueEvent = new NewValueEvent();
          newValueEvent.currentValue = currentValue;
          for (final EventListener eventListener : eventListeners)
          {
              eventListener.newValue(newValueEvent);
          }
      }
  }
  
  