content: /*
   * Copyright 2010-2025 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.engine.impl.cmd;
  
  import org.activiti.engine.ActivitiIllegalArgumentException;
  import org.activiti.engine.delegate.event.ActivitiEventListener;
  import org.activiti.engine.impl.interceptor.Command;
  import org.activiti.engine.impl.interceptor.CommandContext;
  
  /**
   * Command that removes an event-listener to the Activiti engine.
   *
  
   */
  public class RemoveEventListenerCommand implements Command<Void> {
  
      protected ActivitiEventListener listener;
  
      public RemoveEventListenerCommand(ActivitiEventListener listener) {
          super();
          this.listener = listener;
      }
  
      @Override
      public Void execute(CommandContext commandContext) {
          if (listener == null) {
              throw new ActivitiIllegalArgumentException("listener is null.");
          }
  
          commandContext.getProcessEngineConfiguration().getEventDispatcher().removeEventListener(listener);
  
          return null;
      }
  }
  