@Override
  public String handleCommand(String aSessionId, String anInput) {
    if (anInput.startsWith(Command.FILE.name())) {
      // just get the pipe protocol to make sure it is there and to add the listener to it
      try {
        getPipeProtocol();

        String theFileName = anInput.substring(Command.FILE.name().length() + 1);

        if (myFileHandler == null) {
          return Response.REFUSED.name();
        }

        File theFile = myFileHandler.acceptFile(theFileName);

        if (theFile == null) {
          return Response.REFUSED.name();
        }

        FileStatus theStatus = new FileStatus(theFileName, theFile);

        UUID theUID = UUID.randomUUID();
        myMapping.put(theUID, theStatus);

        return Response.ACCEPTED.name() + " " + theUID.toString();
      } catch (ProtocolException e) {
        return ProtocolContainer.Response.UNKNOWN_PROTOCOL.name();
      }
    } else if (anInput.startsWith(Command.WAIT_FOR_FILE.name())) {
      String[] theFileAttributes = anInput.split(" ");
      String theFileId = theFileAttributes[1];
      long theFileSize = Long.parseLong(theFileAttributes[2]);
      UUID theFileUUID = UUID.fromString(theFileId);
      if (!myMapping.containsKey(theFileUUID)) {
        return Response.FILE_NOK.name();
      } else {
        try {
          FileStatus theFileStatus = myMapping.get(theFileUUID);
          FileStatus.Status theStatus = theFileStatus.waitForStatus();
          if (theStatus == FileStatus.Status.OK) {
            // check the file size
            long theRealLength = theFileStatus.getFile().length();
            if (theRealLength == theFileSize) {
              return Response.FILE_OK.name();
            } else {
              return Response.BAD_FILE_SIZE.name();
            }
          } else {
            return Response.FILE_NOK.name();
          }
        } catch (InterruptedException e) {
          return Response.FILE_NOK.name();
        }
      }
    }

    return Response.UNKNOWN_COMMAND.name();
  }
  public void sendFile(File aFile, String aPeerid) throws FileTransferException {
    String theResponse = null;

    ProtocolContainer theProtocolContainer = findProtocolContainer();
    AbstractPeer thePeer = null;
    try {
      thePeer = getRoutingTable().getEntryForPeer(aPeerid).getPeer();
      MessageProtocol theMessageProtocol =
          (MessageProtocol) theProtocolContainer.getProtocol("MSG");
      Message theMessage = new Message();
      theMessage.setDestination(thePeer);
      theMessage.setMessage(createMessage(Command.FILE.name() + " " + aFile.getName()));
      theMessage.setProtocolMessage(true);
      theMessage.setMessageTimeoutInSeconds(-1);
      theResponse = theMessageProtocol.sendMessage(theMessage);
    } catch (ProtocolException e) {
      throw new FileTransferException(
          "Could not transfer file because message protocol is not known", e);
    } catch (MessageException e) {
      throw new FileTransferException(
          "Could not transfer file because message could not be delivered", e);
    } catch (UnknownPeerException e) {
      throw new FileTransferException(
          "Could not transfer file because given peer id is not known", e);
    }

    if (!theResponse.startsWith(Response.ACCEPTED.name())) {
      throw new FileTransferException(
          "The file: '"
              + aFile.getName()
              + "' was refused by peer: '"
              + thePeer.getPeerId()
              + "' with response '"
              + theResponse
              + "'");
    } else {
      String theFileId = theResponse.split(" ")[1];
      // TODO we probably should not just cast to SocketPeer
      Pipe thePipe = new Pipe((SocketPeer) thePeer);
      thePipe.setPipeDescription("FILE:" + theFileId + ":" + aFile.length());
      FileInputStream theInputStream = null;
      try {
        PipeProtocol thePipeProtocol = getPipeProtocol();
        thePipeProtocol.openPipe(thePipe);
        theInputStream = new FileInputStream(aFile);
        IOTools.copyStream(theInputStream, thePipe.getSocket().getOutputStream());
        thePipeProtocol.closePipe(thePipe);

        theResponse =
            getPeerSender()
                .send(
                    thePeer,
                    createMessage(
                        Command.WAIT_FOR_FILE.name() + " " + theFileId + " " + aFile.length()))
                .getReply();

        if (theResponse.equalsIgnoreCase(Response.BAD_FILE_SIZE.name())) {
          throw new FileTransferException("Received file had bad file size");
        }

        if (theResponse.equalsIgnoreCase(Response.FILE_NOK.name())) {
          throw new FileTransferException("Sending file failed");
        }
      } catch (Exception e) {
        throw new FileTransferException(
            "Transferring file to peer: '" + thePeer.getPeerId() + "' could not be initiated", e);
      } finally {
        if (theInputStream != null) {
          try {
            theInputStream.close();
          } catch (IOException e) {
          }
        }
      }
    }
  }