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;
  
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.net.MalformedURLException;
  import java.util.Enumeration;
  
  import jakarta.jms.BytesMessage;
  import jakarta.jms.Destination;
  import jakarta.jms.JMSException;
  import jakarta.jms.MapMessage;
  import jakarta.jms.Message;
  import jakarta.jms.MessageEOFException;
  import jakarta.jms.ObjectMessage;
  import jakarta.jms.StreamMessage;
  import jakarta.jms.TextMessage;
  
  import org.apache.activemq.blob.BlobDownloader;
  import org.apache.activemq.command.ActiveMQBlobMessage;
  import org.apache.activemq.command.ActiveMQBytesMessage;
  import org.apache.activemq.command.ActiveMQDestination;
  import org.apache.activemq.command.ActiveMQMapMessage;
  import org.apache.activemq.command.ActiveMQMessage;
  import org.apache.activemq.command.ActiveMQObjectMessage;
  import org.apache.activemq.command.ActiveMQStreamMessage;
  import org.apache.activemq.command.ActiveMQTextMessage;
  
  /**
   * A helper class for converting normal JMS interfaces into ActiveMQ specific
   * ones.
   *
   *
   */
  public final class ActiveMQMessageTransformation {
  
      private ActiveMQMessageTransformation() {
      }
  
      /**
       * Creates a an available JMS message from another provider.
       *
       * @param destination - Destination to be converted into ActiveMQ's
       *                implementation.
       * @return ActiveMQDestination - ActiveMQ's implementation of the
       *         destination.
       * @throws JMSException if an error occurs
       */
      public static ActiveMQDestination transformDestination(Destination destination) throws JMSException {
          return ActiveMQDestination.transform(destination);
      }
  
      /**
       * Creates a fast shallow copy of the current ActiveMQMessage or creates a
       * whole new message instance from an available JMS message from another
       * provider.
       *
       * @param message - Message to be converted into ActiveMQ's implementation.
       * @param connection
       * @return ActiveMQMessage - ActiveMQ's implementation object of the
       *         message.
       * @throws JMSException if an error occurs
       */
      public static ActiveMQMessage transformMessage(Message message, ActiveMQConnection connection)
          throws JMSException {
          if (message instanceof ActiveMQMessage) {
              return (ActiveMQMessage)message;
  
          } else {
              ActiveMQMessage activeMessage = null;
  
              if (message instanceof BytesMessage) {
                  BytesMessage bytesMsg = (BytesMessage)message;
                  bytesMsg.reset();
                  ActiveMQBytesMessage msg = new ActiveMQBytesMessage();
                  msg.setConnection(connection);
                  try {
                      for (;;) {
                          // Reads a byte from the message stream until the stream
                          // is empty
                          msg.writeByte(bytesMsg.readByte());
                      }
                  } catch (MessageEOFException e) {
                      // if an end of message stream as expected
                  } catch (JMSException e) {
                  }
  
                  activeMessage = msg;
              } else if (message instanceof MapMessage) {
                  MapMessage mapMsg = (MapMessage)message;
                  ActiveMQMapMessage msg = new ActiveMQMapMessage();
                  msg.setConnection(connection);
                  Enumeration iter = mapMsg.getMapNames();
  
                  while (iter.hasMoreElements()) {
                      String name = iter.nextElement().toString();
                      msg.setObject(name, mapMsg.getObject(name));
                  }
  
                  activeMessage = msg;
              } else if (message instanceof ObjectMessage) {
                  ObjectMessage objMsg = (ObjectMessage)message;
                  ActiveMQObjectMessage msg = new ActiveMQObjectMessage();
                  msg.setConnection(connection);
                  msg.setObject(objMsg.getObject());
                  msg.storeContent();
                  activeMessage = msg;
              } else if (message instanceof StreamMessage) {
                  StreamMessage streamMessage = (StreamMessage)message;
                  streamMessage.reset();
                  ActiveMQStreamMessage msg = new ActiveMQStreamMessage();
                  msg.setConnection(connection);
                  Object obj = null;
  
                  try {
                      while ((obj = streamMessage.readObject()) != null) {
                          msg.writeObject(obj);
                      }
                  } catch (MessageEOFException e) {
                      // if an end of message stream as expected
                  } catch (JMSException e) {
                  }
  
                  activeMessage = msg;
              } else if (message instanceof TextMessage) {
                  TextMessage textMsg = (TextMessage)message;
                  ActiveMQTextMessage msg = new ActiveMQTextMessage();
                  msg.setConnection(connection);
                  msg.setText(textMsg.getText());
                  activeMessage = msg;
              } else if (message instanceof BlobMessage) {
                  BlobMessage blobMessage = (BlobMessage)message;
                  ActiveMQBlobMessage msg = new ActiveMQBlobMessage();
                  msg.setConnection(connection);
                  if (connection != null){
                      msg.setBlobDownloader(new BlobDownloader(connection.getBlobTransferPolicy()));
                  }
                  try {
                      msg.setURL(blobMessage.getURL());
                  } catch (MalformedURLException e) {
  
                  }
                  activeMessage = msg;
              } else {
                  activeMessage = new ActiveMQMessage();
                  activeMessage.setConnection(connection);
              }
  
              copyProperties(message, activeMessage);
  
              return activeMessage;
          }
      }
  
      /**
       * Copies the standard JMS and user defined properties from the givem
       * message to the specified message
       *
       * @param fromMessage the message to take the properties from
       * @param toMessage the message to add the properties to
       * @throws JMSException
       */
      public static void copyProperties(Message fromMessage, Message toMessage) throws JMSException {
          toMessage.setJMSMessageID(fromMessage.getJMSMessageID());
          toMessage.setJMSCorrelationID(fromMessage.getJMSCorrelationID());
          toMessage.setJMSReplyTo(transformDestination(fromMessage.getJMSReplyTo()));
          toMessage.setJMSDestination(transformDestination(fromMessage.getJMSDestination()));
          toMessage.setJMSDeliveryMode(fromMessage.getJMSDeliveryMode());
          toMessage.setJMSDeliveryTime(getFromMessageDeliveryTime(fromMessage)); // TODO: AMQ-8500 DeliveryTime support ref: ActiveMQSession#send
          toMessage.setJMSRedelivered(fromMessage.getJMSRedelivered());
          toMessage.setJMSType(fromMessage.getJMSType());
          toMessage.setJMSExpiration(fromMessage.getJMSExpiration());
          toMessage.setJMSPriority(fromMessage.getJMSPriority());
          toMessage.setJMSTimestamp(fromMessage.getJMSTimestamp());
  
          Enumeration propertyNames = fromMessage.getPropertyNames();
  
          while (propertyNames.hasMoreElements()) {
              String name = propertyNames.nextElement().toString();
              Object obj = fromMessage.getObjectProperty(name);
              toMessage.setObjectProperty(name, obj);
          }
      }
  
      private static long getFromMessageDeliveryTime(Message fromMessage) throws JMSException {
          Method deliveryTimeGetMethod = null;
          try {
              Class<?> clazz = fromMessage.getClass();
              Method method = clazz.getMethod("getJMSDeliveryTime");
              if (!Modifier.isAbstract(method.getModifiers())) {
                  deliveryTimeGetMethod = method;
              }
          } catch (NoSuchMethodException e) {
              // We fallback to JMSTimestamp for jms v1.x
          }
  
          if (deliveryTimeGetMethod != null) {
              return fromMessage.getJMSDeliveryTime();
          }
  
          return fromMessage.getJMSTimestamp();
      }
  }
  