content: /*
   * Copyright 2017-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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 org.activiti.cloud.services.events.listeners;
  
  import java.util.ArrayList;
  import java.util.List;
  import org.activiti.engine.impl.context.Context;
  import org.activiti.engine.impl.interceptor.CommandContext;
  import org.activiti.engine.impl.interceptor.CommandContextCloseListener;
  
  public abstract class BaseCommandContextEventsAggregator<E, L extends CommandContextCloseListener> {
  
      public void add(E element) {
          CommandContext currentCommandContext = getCurrentCommandContext();
          List<E> attributes = currentCommandContext.getGenericAttribute(getAttributeKey());
          if (attributes == null) {
              attributes = new ArrayList<>();
              currentCommandContext.addAttribute(getAttributeKey(), attributes);
          }
          attributes.add(element);
  
          if (!currentCommandContext.hasCloseListener(getCloseListenerClass())) {
              currentCommandContext.addCloseListener(getCloseListener());
          }
      }
  
      protected abstract Class<L> getCloseListenerClass();
  
      protected abstract L getCloseListener();
  
      protected abstract String getAttributeKey();
  
      protected CommandContext getCurrentCommandContext() {
          return Context.getCommandContext();
      }
  }
  