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.runtime.api.impl;
  
  import java.util.Map;
  import java.util.Optional;
  import org.activiti.bpmn.model.Event;
  import org.activiti.bpmn.model.MessageEventDefinition;
  import org.activiti.engine.delegate.DelegateExecution;
  import org.activiti.engine.impl.bpmn.behavior.VariablesCalculator;
  import org.activiti.engine.impl.delegate.MessagePayloadMappingProvider;
  import org.activiti.engine.impl.el.ExpressionManager;
  
  public class JsonMessagePayloadMappingProvider implements MessagePayloadMappingProvider {
  
      private final Event bpmnEvent;
      private final MessageEventDefinition messageEventDefinition;
      private final ExpressionManager expressionManager;
      private final VariablesCalculator variablesCalculator;
  
      public JsonMessagePayloadMappingProvider(
          Event bpmnEvent,
          MessageEventDefinition messageEventDefinition,
          ExpressionManager expressionManager,
          VariablesCalculator variablesCalculator
      ) {
          this.bpmnEvent = bpmnEvent;
          this.messageEventDefinition = messageEventDefinition;
          this.expressionManager = expressionManager;
          this.variablesCalculator = variablesCalculator;
      }
  
      public Optional<Map<String, Object>> getMessagePayload(DelegateExecution execution) {
          return Optional.of(variablesCalculator.calculateInputVariables(execution)).filter(payload ->
              !payload.isEmpty()
          );
      }
  
      public Event getBpmnEvent() {
          return bpmnEvent;
      }
  
      public MessageEventDefinition getMessageEventDefinition() {
          return messageEventDefinition;
      }
  
      public ExpressionManager getExpressionManager() {
          return expressionManager;
      }
  
      public VariablesCalculator getVariablesCalculator() {
          return variablesCalculator;
      }
  }
  