Implementing the send and receive states

To implement the send and receive states:

1. Implement the logic for sending a business card in the SendState.doSend method. The HeaderSet.getResponseCode method returns the response code received from the server (defined in the ResponseCodes class).

       /*
        * This method implements the logic for sending a
        * business card
        * 
        */
       public void doSend() {
           try {
               connection = (ClientSession) Connector.open(url);
               HeaderSet response = connection.connect(null);
   
               // Initiate the PUT request
               operation = connection.put(null);
               OutputStream out = operation.openOutputStream();
               //getting the own card
               byte[] vCard = parent.getListener().getOwnBC();
               int vlen = vCard.length;
               byte[] tmpBuf = new byte[vlen + 4];
               System.arraycopy(vCard, 0, tmpBuf, 4, vlen);
               tmpBuf[0] = (byte) ((vlen >>> 24) & 0xff);
               tmpBuf[1] = (byte) ((vlen >>> 16) & 0xff);
               tmpBuf[2] = (byte) ((vlen >>> 8) & 0xff);
               tmpBuf[3] = (byte) ((vlen >>> 0) & 0xff);
               //sending data
               out.write(tmpBuf);
               out.close();
               int responseCode = operation.getResponseCode();
   
               operation.close();
   
               if (cancelInvoked) {
                   throw new Exception(
                           "Cancel did not invoke any exception; throw exception then");
               }
   
               // send is done
               try {
                   parent.setState(new IdleState(parent));
               } catch (Exception e) {
               }
           } catch (Exception e1) {
               parent.setState(new IdleState(parent));
               if (cancelInvoked) { // if exception is caused by cancellation
                   parent.getListener().onSendComplete(ExchangerComm.CANCELED);
               } else { // if exception is caused by error
                   parent.setState(new IdleState(parent));
                   parent.getListener().onSendComplete(ExchangerComm.ERROR);
               }
           } finally {
               try { // finalizing operation
                   operation.close();
               } catch (IOException e3) {
               }
   
               try { // sending DISCONNECT command
                   connection.disconnect(null);
                   connection.close();
               } catch (IOException e2) {
                   // Ignore, disconnecting anyway
               }
           }
       }

2. Implement the logic for receiving a business card in the ReceiveState.doGet method. The HeaderSet.getResponseCode method returns the response code received from the server (defined in the ResponseCodes class).

       /*
        * This method implements the logic for
        * receving a business card
        *
        */
       public void doGet() {
           try {
               connection = (ClientSession) Connector.open(url);
               HeaderSet response = connection.connect(null);
               operation = connection.get(null);
               InputStream in = operation.openInputStream();
               byte[] fullResult = null;
               {
                   byte[] buf = new byte[256];
                   ByteArrayOutputStream bout = new ByteArrayOutputStream(2048);
                   for (int len = in.read(buf); len >= 0; len = in.read(buf)) {
                       bout.write(buf, 0, len);
                   }
                   fullResult = bout.toByteArray();
               }
               ByteArrayInputStream bin = new ByteArrayInputStream(fullResult);
               DataInputStream din = new DataInputStream(bin);
               int size = din.readInt();
               byte[] vCard = new byte[size];
               din.read(vCard);
   
               parent.getListener().onReceiveBC(vCard);
   
               // End the transaction
               in.close();
               int responseCode = operation.getResponseCode();
   
               operation.close();
   
               if (cancelInvoked) {
                   throw new Exception(
                           "Cancel did not invoke any exception; throw exception then");
               }
   
               // receive is done
               try {
                   parent.setState(new IdleState(parent));
                   parent.getListener().onReceiveComplete(ExchangerComm.DONE);
               } catch (Exception e) {
               }
           } catch (Exception e1) {
               if (cancelInvoked) { // if exception was caused by canceling
                   parent.setState(new IdleState(parent));
                   parent.getListener().onReceiveComplete(ExchangerComm.CANCELED);
               } else { // if exception was caused by error
   
                   parent.setState(new IdleState(parent));
                   parent.getListener().onReceiveComplete(ExchangerComm.ERROR);
               }
           } finally {
               try { // finalizing operation
                   operation.close();
               } catch (IOException e3) {
               }
   
               try { // sending DISCONNECT command
                   connection.disconnect(null);
               } catch (IOException e2) {
                   // Ignore, disconnecting anyway
               }
           }
       }