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.activemq.transport.amqp.message;
  
  import static org.apache.activemq.transport.amqp.message.AmqpMessageSupport.JMS_AMQP_MESSAGE_FORMAT;
  import static org.apache.activemq.transport.amqp.message.AmqpMessageSupport.getBinaryFromMessageBody;
  
  import jakarta.jms.JMSException;
  import jakarta.jms.MessageFormatException;
  
  import org.apache.activemq.command.ActiveMQBytesMessage;
  import org.apache.activemq.command.ActiveMQMessage;
  import org.apache.qpid.proton.amqp.Binary;
  import org.apache.qpid.proton.amqp.UnsignedInteger;
  import org.apache.qpid.proton.amqp.messaging.Header;
  import org.apache.qpid.proton.message.ProtonJMessage;
  
  public class AMQPNativeOutboundTransformer implements OutboundTransformer {
  
      @Override
      public EncodedMessage transform(ActiveMQMessage message) throws Exception {
          if (message == null || !(message instanceof ActiveMQBytesMessage)) {
              return null;
          }
  
          return transform(this, (ActiveMQBytesMessage) message);
      }
  
      static EncodedMessage transform(OutboundTransformer options, ActiveMQBytesMessage message) throws JMSException {
          final long messageFormat;
          if (message.propertyExists(JMS_AMQP_MESSAGE_FORMAT)) {
              try {
                  messageFormat = message.getLongProperty(JMS_AMQP_MESSAGE_FORMAT);
              } catch (MessageFormatException e) {
                  return null;
              }
          } else {
              messageFormat = 0;
          }
  
          Binary encodedMessage = getBinaryFromMessageBody(message);
          byte encodedData[] = encodedMessage.getArray();
          int encodedSize = encodedMessage.getLength();
  
          int count = message.getRedeliveryCounter();
          if (count >= 1) {
  
              // decode...
              ProtonJMessage amqp = (ProtonJMessage) org.apache.qpid.proton.message.Message.Factory.create();
              int offset = 0;
              int len = encodedSize;
              while (len > 0) {
                  final int decoded = amqp.decode(encodedData, offset, len);
                  assert decoded > 0 : "Make progress decoding the message";
                  offset += decoded;
                  len -= decoded;
              }
  
              // Update the DeliveryCount header...
              // The AMQP delivery-count field only includes prior failed delivery attempts,
              // whereas JMSXDeliveryCount includes the first/current delivery attempt. Subtract 1.
              if (amqp.getHeader() == null) {
                  amqp.setHeader(new Header());
              }
  
              amqp.getHeader().setDeliveryCount(new UnsignedInteger(count));
  
              // Re-encode...
              final AmqpWritableBuffer buffer = new AmqpWritableBuffer();
              int written = amqp.encode(buffer);
  
              encodedData = buffer.getArray();
              encodedSize = written;
          }
  
          return new EncodedMessage(messageFormat, encodedData, 0, encodedSize);
      }
  }
  