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.delegate;
  
  import static java.util.Collections.unmodifiableMap;
  
  import java.util.AbstractMap;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import org.activiti.engine.delegate.DelegateExecution;
  import org.activiti.engine.delegate.Expression;
  import org.activiti.engine.impl.bpmn.parser.FieldDeclaration;
  
  public class BpmnMessagePayloadMappingProvider implements MessagePayloadMappingProvider {
  
      private final List<FieldDeclaration> fieldDeclarations;
  
      public BpmnMessagePayloadMappingProvider(List<FieldDeclaration> fieldDeclarations) {
          super();
          this.fieldDeclarations = fieldDeclarations;
      }
  
      @Override
      public Optional<Map<String, Object>> getMessagePayload(DelegateExecution execution) {
          Map<String, Object> payload = new LinkedHashMap<>();
  
          fieldDeclarations
              .stream()
              .map(field -> applyFieldDeclaration(execution, field))
              .forEach(entry -> payload.put(entry.getKey(), entry.getValue()));
  
          return Optional.of(payload)
              .filter(map -> !map.isEmpty())
              .map(map -> unmodifiableMap(map));
      }
  
      protected Map.Entry<String, Object> applyFieldDeclaration(DelegateExecution execution, FieldDeclaration field) {
          return Optional.of(field)
              .map(f -> {
                  Object value = Optional.ofNullable(f.getValue())
                      .map(v -> (Expression.class.isInstance(v)) ? Expression.class.cast(v).getValue(execution) : v)
                      .orElse(null);
  
                  return new AbstractMap.SimpleImmutableEntry<>(field.getName(), value);
              })
              .get();
      }
  }
  