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.udp;
  
  
  import java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.net.DatagramPacket;
  import java.net.SocketAddress;
  import java.nio.ByteBuffer;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.activemq.command.Command;
  import org.apache.activemq.command.Endpoint;
  
  /**
   * 
   * 
   */
  public class DatagramHeaderMarshaller {
  
      // TODO for large dynamic networks
      // we may want to evict endpoints that disconnect
      // from a transport - e.g. for multicast
      private Map<SocketAddress, Endpoint> endpoints = new HashMap<SocketAddress, Endpoint>();
      
      /**
       * Reads any header if applicable and then creates an endpoint object
       */
      public Endpoint createEndpoint(ByteBuffer readBuffer, SocketAddress address) {
          return getEndpoint(address);
      }
  
      public Endpoint createEndpoint(DatagramPacket datagram, DataInputStream dataIn) {
          return getEndpoint(datagram.getSocketAddress());
      }
  
      public void writeHeader(Command command, ByteBuffer writeBuffer) {
          /*
          writeBuffer.putLong(command.getCounter());
          writeBuffer.putInt(command.getDataSize());
          byte flags = command.getFlags();
          //System.out.println("Writing header with counter: " + header.getCounter() + " size: " + header.getDataSize() + " with flags: " + flags);
          writeBuffer.put(flags);
          */
      }
  
      public void writeHeader(Command command, DataOutputStream dataOut) {
      }
  
      /**
       * Gets the current endpoint object for this address or creates one if not available.
       * 
       * Note that this method does not need to be synchronized as its only ever going to be
       * used by the already-synchronized read() method of a CommandChannel 
       * 
       */
      protected Endpoint getEndpoint(SocketAddress address) {
          Endpoint endpoint = endpoints.get(address);
          if (endpoint == null) {
              endpoint = createEndpoint(address);
              endpoints.put(address, endpoint);
          }
          return endpoint;
      }
  
      protected Endpoint createEndpoint(SocketAddress address) {
          return new DatagramEndpoint(address.toString(), address);
      }
  }
  