content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.camel.component.jackson.transform;
  
  import java.nio.charset.StandardCharsets;
  
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.JsonNode;
  import org.apache.camel.CamelExecutionException;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.component.jackson.SchemaHelper;
  import org.apache.camel.spi.DataType;
  import org.apache.camel.spi.DataTypeTransformer;
  import org.apache.camel.spi.MimeType;
  import org.apache.camel.spi.Transformer;
  
  /**
   * Data type uses Jackson data format to marshal given Exchange payload to a Json (binary byte array representation).
   * Requires Exchange payload as JsonNode representation.
   */
  @DataTypeTransformer(name = "application-json",
                       description = "Transforms from JSon to binary (byte array) using Jackson")
  public class JsonDataTypeTransformer extends Transformer {
  
      @Override
      public void transform(Message message, DataType fromType, DataType toType) {
          try {
              byte[] marshalled;
              if (message.getBody() instanceof String jsonString && Json.isJson(jsonString)) {
                  marshalled = jsonString.getBytes(StandardCharsets.UTF_8);
              } else {
                  String contentClass = SchemaHelper.resolveContentClass(message.getExchange(), JsonNode.class.getName());
                  Class<?> contentType
                          = message.getExchange().getContext().getClassResolver().resolveMandatoryClass(contentClass);
  
                  marshalled = Json.mapper().writer().forType(contentType).writeValueAsBytes(message.getBody());
              }
              message.setBody(marshalled);
  
              message.setHeader(Exchange.CONTENT_TYPE, MimeType.JSON.type());
  
              String contentSchema = message.getExchange().getProperty(SchemaHelper.CONTENT_SCHEMA, String.class);
              if (contentSchema != null) {
                  message.setHeader(SchemaHelper.CONTENT_SCHEMA, contentSchema);
              }
          } catch (JsonProcessingException | ClassNotFoundException e) {
              throw new CamelExecutionException("Failed to apply Json output data type on exchange", message.getExchange(), e);
          }
      }
  }
  