1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.io;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.io.IOException;
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7 | import java.io.InputStream;
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8 | import java.net.HttpURLConnection;
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9 | import java.net.URL;
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10 | import java.util.zip.Inflater;
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11 | import java.util.zip.InflaterInputStream;
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12 | import java.util.zip.GZIPInputStream;
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13 |
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14 | import org.openstreetmap.josm.Main;
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15 | import org.openstreetmap.josm.data.osm.DataSet;
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16 | import org.openstreetmap.josm.gui.PleaseWaitDialog;
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17 | import org.xml.sax.SAXException;
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18 |
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19 | /**
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20 | * This DataReader reads directly from the REST API of the osm server.
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21 | *
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22 | * It supports plain text transfer as well as gzip or deflate encoded transfers;
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23 | * if compressed transfers are unwanted, set property osm-server.use-compression
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24 | * to false.
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25 | *
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26 | * @author imi
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27 | */
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28 | public abstract class OsmServerReader extends OsmConnection {
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29 | /**
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30 | * Open a connection to the given url and return a reader on the input stream
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31 | * from that connection. In case of user cancel, return <code>null</code>.
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32 | * @param urlStr The exact url to connect to.
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33 | * @param pleaseWaitDlg
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34 | * @return An reader reading the input stream (servers answer) or <code>null</code>.
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35 | */
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36 | protected InputStream getInputStream(String urlStr, PleaseWaitDialog pleaseWaitDlg) throws IOException {
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37 | String version = Main.pref.get("osm-server.version", "0.5");
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38 | urlStr = Main.pref.get("osm-server.url")+"/"+version+"/" + urlStr;
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39 | return getInputStreamRaw(urlStr, pleaseWaitDlg);
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40 | }
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41 |
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42 | protected InputStream getInputStreamRaw(String urlStr, PleaseWaitDialog pleaseWaitDlg) throws IOException {
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43 |
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44 | // System.out.println("download: "+urlStr);
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45 | initAuthentication();
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46 | URL url = new URL(urlStr);
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47 | activeConnection = (HttpURLConnection)url.openConnection();
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48 | if (cancel) {
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49 | activeConnection.disconnect();
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50 | return null;
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51 | }
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52 |
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53 | if (Main.pref.getBoolean("osm-server.use-compression", true))
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54 | activeConnection.setRequestProperty("Accept-Encoding", "gzip, deflate");
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55 |
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56 | activeConnection.setConnectTimeout(15000);
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57 |
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58 | try {
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59 | activeConnection.connect();
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60 | }
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61 | catch (Exception e) {
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62 | throw new IOException(tr("Couldn't connect to the osm server. Please check your internet connection."));
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63 | }
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64 |
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65 | if (isAuthCancelled() && activeConnection.getResponseCode() == 401)
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66 | return null;
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67 | if (activeConnection.getResponseCode() == 500)
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68 | {
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69 | throw new IOException(tr("Server returned internal error. Try a reduced area or retry after waiting some time."));
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70 | }
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71 | // System.out.println("got return: "+activeConnection.getResponseCode());
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72 |
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73 | String encoding = activeConnection.getContentEncoding();
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74 | InputStream inputStream = new ProgressInputStream(activeConnection, pleaseWaitDlg);
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75 | if (encoding != null && encoding.equalsIgnoreCase("gzip")) {
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76 | inputStream = new GZIPInputStream(inputStream);
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77 | }
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78 | else if (encoding != null && encoding.equalsIgnoreCase("deflate")) {
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79 | inputStream = new InflaterInputStream(inputStream, new Inflater(true));
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80 | }
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81 | return inputStream;
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82 | }
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83 |
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84 | public abstract DataSet parseOsm() throws SAXException, IOException;
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85 |
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86 | }
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