Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/BedloadKMChartServiceImpl.java @ 5376:9b2482a3b9fe
adjusting files
author | Bettina Gruenbauer <bettina@intevation.de> |
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date | Fri, 22 Mar 2013 11:01:31 +0100 |
parents | f84ed73311f2 |
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rev | line source |
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1 package de.intevation.flys.client.server; |
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2 |
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3 import java.io.IOException; |
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4 import java.io.InputStream; |
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5 import java.io.OutputStream; |
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6 |
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7 import javax.servlet.http.HttpServlet; |
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8 import javax.servlet.http.HttpServletRequest; |
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9 import javax.servlet.http.HttpServletResponse; |
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10 |
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11 import org.apache.log4j.Logger; |
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12 import org.w3c.dom.Document; |
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13 import org.w3c.dom.Element; |
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14 import org.w3c.dom.NodeList; |
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15 |
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16 import de.intevation.artifacts.common.utils.XMLUtils; |
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17 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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18 import de.intevation.artifacts.httpclient.http.HttpClient; |
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19 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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20 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler; |
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21 |
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22 public class BedloadKMChartServiceImpl extends HttpServlet { |
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23 private static final Logger log = |
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24 Logger.getLogger(FixingsKMChartServiceImpl.class); |
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25 |
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26 public static final String SERVICE_NAME = "bedload-km-chart"; |
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27 |
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28 public BedloadKMChartServiceImpl() { |
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29 } |
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30 |
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31 public void doGet(HttpServletRequest req, HttpServletResponse resp) { |
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32 |
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33 log.info("BedloadKMChartServiceImpl.doGet"); |
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34 |
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35 String url = getServletContext().getInitParameter("server-url"); |
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36 String locale = req.getParameter("locale"); |
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37 String filter = req.getParameter("filter"); |
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38 |
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39 if (filter == null || filter.length() == 0) { |
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40 log.warn("Missing 'filter' parameter."); |
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41 return; |
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42 } |
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43 |
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44 if (locale == null || locale.length() == 0) { |
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45 locale = "de"; |
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46 } |
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47 |
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48 Document filterDoc = XMLUtils.jsonToXML(filter); |
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49 |
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50 if (filterDoc == null) { |
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51 log.warn("Creating filter document failed."); |
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52 return; |
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53 } |
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54 |
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55 InputStream in; |
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56 |
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57 try { |
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58 HttpClient client = new HttpClientImpl(url, locale); |
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59 in = (InputStream)client.callService( |
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60 url, // XXX: Why? The URL is passed by construction already. |
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61 SERVICE_NAME, |
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62 filterDoc, |
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63 new StreamResponseHandler()); |
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64 } |
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65 catch (ConnectionException ce) { |
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66 log.error(ce); |
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67 return; |
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68 } |
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69 |
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70 resp.setHeader("Content-Type", guessMIMEType(filterDoc)); |
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71 |
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72 try { |
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73 OutputStream out = resp.getOutputStream(); |
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74 |
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75 byte [] buf = new byte[4096]; |
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76 int i = -1; |
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77 while ((i = in.read(buf)) >= 0) { |
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78 out.write(buf, 0, i); |
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79 } |
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80 out.flush(); |
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81 } |
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82 catch (IOException ioe) { |
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83 log.error(ioe); |
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84 } |
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85 finally { |
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86 try { in.close(); } |
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87 catch (IOException ioe) { /* ignored */ } |
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88 } |
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89 } |
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90 |
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91 protected static String guessMIMEType(Document document) { |
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92 |
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93 NodeList formats = document.getElementsByTagName("format"); |
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94 |
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95 String format = "png"; |
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96 |
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97 if (formats.getLength() > 0) { |
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98 String type = ((Element)formats.item(0)).getAttribute("type"); |
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99 if (type.length() > 0) { |
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100 format = type; |
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101 } |
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102 } |
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103 |
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104 return "image/" + format; |
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105 } |
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106 } |