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.query.events.handlers;
  
  import jakarta.persistence.EntityManager;
  import org.activiti.api.task.model.events.TaskCandidateUserEvent;
  import org.activiti.cloud.api.model.shared.events.CloudRuntimeEvent;
  import org.activiti.cloud.api.task.model.events.CloudTaskCandidateUserAddedEvent;
  import org.activiti.cloud.services.query.model.QueryException;
  import org.activiti.cloud.services.query.model.TaskCandidateUserEntity;
  import org.activiti.cloud.services.query.model.TaskCandidateUserId;
  
  public class TaskCandidateUserAddedEventHandler implements QueryEventHandler {
  
      private final EntityManager entityManager;
  
      public TaskCandidateUserAddedEventHandler(EntityManager entityManager) {
          this.entityManager = entityManager;
      }
  
      @Override
      public void handle(CloudRuntimeEvent<?, ?> event) {
          CloudTaskCandidateUserAddedEvent taskCandidateUserAddedEvent = (CloudTaskCandidateUserAddedEvent) event;
          org.activiti.api.task.model.TaskCandidateUser taskCandidateUser = taskCandidateUserAddedEvent.getEntity();
          TaskCandidateUserEntity entity = new TaskCandidateUserEntity(
              taskCandidateUser.getTaskId(),
              taskCandidateUser.getUserId()
          );
  
          try {
              if (!taskCandidateEntityAlreadyExists(entity)) {
                  entityManager.persist(entity);
              }
          } catch (Exception cause) {
              throw new QueryException("Error handling TaskCandidateUserAddedEvent[" + event + "]", cause);
          }
      }
  
      @Override
      public String getHandledEvent() {
          return TaskCandidateUserEvent.TaskCandidateUserEvents.TASK_CANDIDATE_USER_ADDED.name();
      }
  
      private boolean taskCandidateEntityAlreadyExists(TaskCandidateUserEntity entity) {
          return (
              entityManager.find(
                  TaskCandidateUserEntity.class,
                  new TaskCandidateUserId(entity.getTaskId(), entity.getUserId())
              ) !=
              null
          );
      }
  }
  