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.kafka.serde;
  
  import java.nio.ByteBuffer;
  
  import org.apache.camel.CamelContext;
  import org.apache.camel.CamelContextAware;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class DefaultKafkaHeaderSerializer implements KafkaHeaderSerializer, CamelContextAware {
  
      private static final Logger LOG = LoggerFactory.getLogger(DefaultKafkaHeaderSerializer.class);
      private CamelContext camelContext;
  
      @Override
      public byte[] serialize(final String key, final Object value) {
          if (value instanceof String string) {
              return string.getBytes();
          } else if (value instanceof Long aLong) {
              ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
              buffer.putLong(aLong);
              return buffer.array();
          } else if (value instanceof Integer integer) {
              ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES);
              buffer.putInt(integer);
              return buffer.array();
          } else if (value instanceof Double aDouble) {
              ByteBuffer buffer = ByteBuffer.allocate(Double.BYTES);
              buffer.putDouble(aDouble);
              return buffer.array();
          } else if (value instanceof Boolean b) {
              return b.toString().getBytes();
          } else if (value instanceof byte[] bytes) {
              return bytes;
          }
          if (camelContext != null) {
              byte[] converted = camelContext.getTypeConverter().tryConvertTo(byte[].class, value);
              if (converted != null) {
                  return converted;
              }
          }
  
          LOG.debug("Cannot propagate header value of type[{}], skipping... "
                    + "Supported types: String, Integer, Long, Double, byte[].",
                  value != null ? value.getClass() : "null");
          return null;
      }
  
      @Override
      public CamelContext getCamelContext() {
          return camelContext;
      }
  
      @Override
      public void setCamelContext(CamelContext camelContext) {
          this.camelContext = camelContext;
      }
  }
  