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;
  
  import java.io.ByteArrayOutputStream;
  import java.io.DataInputStream;
  import java.io.IOException;
  
  import org.apache.activemq.command.Command;
  import org.apache.activemq.command.LastPartialCommand;
  import org.apache.activemq.command.PartialCommand;
  import org.apache.activemq.openwire.OpenWireFormat;
  import org.apache.activemq.util.ByteArrayInputStream;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Joins together of partial commands which were split into individual chunks of
   * data.
   * 
   * 
   */
  public class CommandJoiner extends TransportFilter {
      private static final Logger LOG = LoggerFactory.getLogger(CommandJoiner.class);
  
      private ByteArrayOutputStream out = new ByteArrayOutputStream();
      private OpenWireFormat wireFormat;
  
      public CommandJoiner(Transport next, OpenWireFormat wireFormat) {
          super(next);
          this.wireFormat = wireFormat;
      }
  
      public void onCommand(Object o) {
          Command command = (Command)o;
          byte type = command.getDataStructureType();
          if (type == PartialCommand.DATA_STRUCTURE_TYPE || type == LastPartialCommand.DATA_STRUCTURE_TYPE) {
              PartialCommand header = (PartialCommand)command;
              byte[] partialData = header.getData();
              try {
                  out.write(partialData);
              } catch (IOException e) {
                  getTransportListener().onException(e);
              }
              if (type == LastPartialCommand.DATA_STRUCTURE_TYPE) {
                  try {
                      byte[] fullData = out.toByteArray();
                      out.reset();
                      DataInputStream dataIn = new DataInputStream(new ByteArrayInputStream(fullData));
                      Command completeCommand = (Command)wireFormat.unmarshal(dataIn);
  
                      LastPartialCommand lastCommand = (LastPartialCommand)command;
                      lastCommand.configure(completeCommand);
  
                      getTransportListener().onCommand(completeCommand);
                  } catch (IOException e) {
                      LOG.warn("Failed to unmarshal partial command: " + command);
                      getTransportListener().onException(e);
                  }
              }
          } else {
              getTransportListener().onCommand(command);
          }
      }
  
      public void stop() throws Exception {
          super.stop();
          out = null;
      }
  
      public String toString() {
          return next.toString();
      }
  }
  