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1 /*
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2 CCmI Editor - A Collaborative Cross-Modal Diagram Editing Tool
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3
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4 Copyright (C) 2011 Queen Mary University of London (http://ccmi.eecs.qmul.ac.uk/)
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation, either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 */
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19
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20 package uk.ac.qmul.eecs.ccmi.network;
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21
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22
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23 import java.net.InetSocketAddress;
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24 import java.nio.channels.SocketChannel;
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25
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26 import uk.ac.qmul.eecs.ccmi.gui.DiagramEventSource;
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27 import uk.ac.qmul.eecs.ccmi.gui.SpeechOptionPane;
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28 import uk.ac.qmul.eecs.ccmi.utils.PreferencesService;
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29
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30 /**
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31 * A {@code SwingWorker} that takes on the communication with the server in the very first phase of the
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32 * connection for a new diagram. It handles the download of the list of diagrams available for sharing on the server
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33 * and, once the user has chosen one, it downloads the diagram into the local editor.
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34 * Since this tasks can take a long time due to network delay and the interaction has not yet started
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35 * a {@code SwingWorker} is used so that the user interface won't get stuck in the process, the user
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36 * being able to cancel the job and to go back to the diagram editor.
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37 *
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38 */
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39 public class DiagramDownloader extends SpeechOptionPane.ProgressDialogWorker<String,Void> {
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40
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41 public DiagramDownloader(SocketChannel channel, String target, int task){
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42 this.channel = channel;
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43 this.task = task;
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44 if(task == CONNECT_AND_DOWNLOAD_LIST_TASK)
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45 this.address = target;
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46 else
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47 this.diagramName = target;
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48 }
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49
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50 @Override
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51 protected String doInBackground() throws Exception {
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52 if(task == CONNECT_AND_DOWNLOAD_LIST_TASK){
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53 int port = Integer.parseInt(PreferencesService.getInstance().get("server.remote_port", Server.DEFAULT_REMOTE_PORT));
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54 channel.connect(new InetSocketAddress(address,port));
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55 }
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56
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57 Protocol protocol = ProtocolFactory.newInstance();
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58 switch(task){
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59 case CONNECT_AND_DOWNLOAD_LIST_TASK :
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60 protocol.send(channel, new Command(Command.Name.LIST,"",DiagramEventSource.NONE));
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61 break;
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62 case DOWNLOAD_DIAGRAM_TASK :
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63 protocol.send(channel, new Command(Command.Name.GET ,diagramName,DiagramEventSource.NONE));
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64 }
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65 Reply reply = protocol.receiveReply(channel);
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66 switch(reply.getName()){
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67 case ERROR_R :
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68 throw new DiagramShareException(reply.getMessage());
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69 case LIST_R :
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70 String result = new String(reply.getMessage());
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71 if("".equals(result))
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72 return null;
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73 return result;
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74 case GET_R :
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75 return reply.getMessage();
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76 default : throw new RuntimeException();
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77 }
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78 }
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79
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80 public static final int CONNECT_AND_DOWNLOAD_LIST_TASK = 0;
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81 public static final int DOWNLOAD_DIAGRAM_TASK = 1;
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82
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83 private SocketChannel channel;
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84 private String diagramName;
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85 private String address;
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86 private int task;
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87 }
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