Source code: Freenet/MessageFactory.java

   package Freenet;
   
   import java.lang.reflect.*;
   import java.io.*;
   import java.util.Hashtable.*;
   import Freenet.support.*;
   
   /*
     This code is part of the Java Adaptive Network Client by Ian Clarke. 
    It is distributed under the GNU Public Licence (GPL) version 2.  See
    http://www.gnu.org/ for further details of the GPL.
   */
  
  /**
   * MessageFactory.java
   *
   * This object takes a RawMessage and converts it to the appropriate 
   * subclass of the Message class depending on the message.
   *
   * @author Brandon Wiley (blanu@uts.cc.utexas.edu)
   * @author Ian Clarke (I.Clarke@strs.co.uk)
   **/
  
  public class MessageFactory
  {
      public static Message toMessage(RawMessage r) throws InvalidMessageException
      {
        try
        {
          Class c=Loader.load(r.messageType);
          Class[] carr={Freenet.RawMessage.class};
          Object[] oarr={r};
          Constructor con=c.getConstructor(carr);
    Message m=(Message)con.newInstance(oarr);
          return m;
  
        } catch(InvocationTargetException e) {
      if (e.getTargetException() instanceof InvalidMessageException)
          throw (InvalidMessageException) e.getTargetException();
      else {
          Logger.log("MessageFactory.java","Message constructor threw exception:",Logger.ERROR);
          e.getTargetException().printStackTrace(Logger.Lout);
          throw new InvalidMessageException("Message constructor threw unkown exception.");
      }
        }
        catch(ClassNotFoundException e) {
      Logger.log("MessageFactory.java","Unknown messagetype - "+e,Logger.NORMAL);
      throw new InvalidMessageException("Message type not recognized");
        }
        catch(Exception e)
    {
      e.printStackTrace(Logger.Lout);
      throw new InvalidMessageException("Unknown Error");
    }
  
      }
  }