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.impl.interceptor.CommandContext;
  import org.activiti.engine.impl.persistence.entity.TaskEntity;
  import org.activiti.engine.task.IdentityLinkType;
  
  /**
  
  
  
   */
  public class DeleteIdentityLinkCmd extends NeedsActiveTaskCmd<Void> {
  
      private static final long serialVersionUID = 1L;
  
      public static int IDENTITY_USER = 1;
      public static int IDENTITY_GROUP = 2;
  
      protected String userId;
  
      protected String groupId;
  
      protected String type;
  
      public DeleteIdentityLinkCmd(String taskId, String userId, String groupId, String type) {
          super(taskId);
          validateParams(userId, groupId, type, taskId);
          this.taskId = taskId;
          this.userId = userId;
          this.groupId = groupId;
          this.type = type;
      }
  
      protected void validateParams(String userId, String groupId, String type, String taskId) {
          if (taskId == null) {
              throw new ActivitiIllegalArgumentException("taskId is null");
          }
  
          if (type == null) {
              throw new ActivitiIllegalArgumentException("type is required when adding a new task identity link");
          }
  
          // Special treatment for assignee and owner: group cannot be used and
          // userId may be null
          if (IdentityLinkType.ASSIGNEE.equals(type) || IdentityLinkType.OWNER.equals(type)) {
              if (groupId != null) {
                  throw new ActivitiIllegalArgumentException(
                      "Incompatible usage: cannot use type '" + type + "' together with a groupId"
                  );
              }
          } else {
              if (userId == null && groupId == null) {
                  throw new ActivitiIllegalArgumentException("userId and groupId cannot both be null");
              }
          }
      }
  
      protected Void execute(CommandContext commandContext, TaskEntity task) {
          if (IdentityLinkType.ASSIGNEE.equals(type)) {
              commandContext.getTaskEntityManager().changeTaskAssignee(task, null);
          } else if (IdentityLinkType.OWNER.equals(type)) {
              commandContext.getTaskEntityManager().changeTaskOwner(task, null);
          } else {
              commandContext.getIdentityLinkEntityManager().deleteIdentityLink(task, userId, groupId, type);
          }
  
          commandContext.getHistoryManager().createIdentityLinkComment(taskId, userId, groupId, type, false);
  
          return null;
      }
  }
  