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.validation.validator.impl;
  
  import java.util.ArrayList;
  import java.util.List;
  import org.activiti.bpmn.model.BpmnModel;
  import org.activiti.bpmn.model.EventDefinition;
  import org.activiti.bpmn.model.MessageEventDefinition;
  import org.activiti.bpmn.model.Process;
  import org.activiti.bpmn.model.SignalEventDefinition;
  import org.activiti.bpmn.model.StartEvent;
  import org.activiti.bpmn.model.TimerEventDefinition;
  import org.activiti.validation.ValidationError;
  import org.activiti.validation.validator.Problems;
  import org.activiti.validation.validator.ProcessLevelValidator;
  
  /**
  
   */
  public class StartEventValidator extends ProcessLevelValidator {
  
      @Override
      protected void executeValidation(BpmnModel bpmnModel, Process process, List<ValidationError> errors) {
          List<StartEvent> startEvents = process.findFlowElementsOfType(StartEvent.class, false);
          validateEventDefinitionTypes(startEvents, process, errors);
          validateMultipleStartEvents(startEvents, process, errors);
      }
  
      protected void validateEventDefinitionTypes(
          List<StartEvent> startEvents,
          Process process,
          List<ValidationError> errors
      ) {
          for (StartEvent startEvent : startEvents) {
              if (startEvent.getEventDefinitions() != null && !startEvent.getEventDefinitions().isEmpty()) {
                  EventDefinition eventDefinition = startEvent.getEventDefinitions().get(0);
                  if (
                      !(eventDefinition instanceof MessageEventDefinition) &&
                      !(eventDefinition instanceof TimerEventDefinition) &&
                      !(eventDefinition instanceof SignalEventDefinition)
                  ) {
                      addError(errors, Problems.START_EVENT_INVALID_EVENT_DEFINITION, process, startEvent);
                  }
              }
          }
      }
  
      protected void validateMultipleStartEvents(
          List<StartEvent> startEvents,
          Process process,
          List<ValidationError> errors
      ) {
          // Multiple none events are not supported
          List<StartEvent> noneStartEvents = new ArrayList<StartEvent>();
          for (StartEvent startEvent : startEvents) {
              if (startEvent.getEventDefinitions() == null || startEvent.getEventDefinitions().isEmpty()) {
                  noneStartEvents.add(startEvent);
              }
          }
  
          if (noneStartEvents.size() > 1) {
              for (StartEvent startEvent : noneStartEvents) {
                  addError(errors, Problems.START_EVENT_MULTIPLE_FOUND, process, startEvent);
              }
          }
      }
  }
  