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.kafkaconnector.transforms;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.connect.connector.ConnectRecord;
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.json.JsonConverter;
  import org.apache.kafka.connect.json.JsonConverterConfig;
  import org.apache.kafka.connect.storage.ConverterConfig;
  import org.apache.kafka.connect.storage.ConverterType;
  import org.apache.kafka.connect.transforms.Transformation;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class SchemaAndStructToJsonTransform<R extends ConnectRecord<R>> implements Transformation<R> {
      private static final Logger LOG = LoggerFactory.getLogger(SchemaAndStructToJsonTransform.class);
  
      private JsonConverter jsonConverter;
  
      @Override
      public R apply(R r) {
          LOG.debug("Incoming record: {}", r);
  
          if (r.value() != null && r.valueSchema() != null) {
              byte[] json = jsonConverter.fromConnectData(r.topic(), r.valueSchema(), r.value());
  
              if (json == null) {
                  LOG.warn("No record was converted as part of this transformation, resulting json byte[] was null.");
                  return r;
              }
  
              LOG.debug("Json created: {}", new String(json));
  
              return r.newRecord(r.topic(), r.kafkaPartition(), r.keySchema(), r.key(),
                      Schema.BYTES_SCHEMA, json, r.timestamp());
          } else {
              LOG.debug("Incoming record with a null value or a null schema, nothing to be done.");
              return r;
          }
      }
  
      @Override
      public ConfigDef config() {
          return JsonConverterConfig.configDef();
      }
  
      @Override
      public void close() {
          //NOOP
      }
  
      @Override
      public void configure(Map<String, ?> configs) {
          jsonConverter = new JsonConverter();
          Map<String, Object> conf = new HashMap<>(configs);
          conf.put(ConverterConfig.TYPE_CONFIG, ConverterType.VALUE.getName());
          jsonConverter.configure(conf);
      }
  }