Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/SQKMChartServiceImpl.java @ 5738:54077c9c9305
Backend: Fix Stack overflow.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Tue, 16 Apr 2013 18:55:52 +0200 |
parents | 75e9eab05ee4 |
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rev | line source |
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Added overview chart to sq relation period input panel.
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1 package de.intevation.flys.client.server; |
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2 |
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3 import org.apache.log4j.Logger; |
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4 |
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5 import java.io.IOException; |
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6 import java.io.InputStream; |
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7 import java.io.OutputStream; |
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8 |
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9 import javax.servlet.http.HttpServlet; |
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10 import javax.servlet.http.HttpServletRequest; |
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11 import javax.servlet.http.HttpServletResponse; |
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12 |
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13 import org.w3c.dom.Document; |
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14 import org.w3c.dom.Element; |
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15 import org.w3c.dom.NodeList; |
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16 |
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17 import de.intevation.artifacts.common.utils.XMLUtils; |
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18 |
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19 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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20 import de.intevation.artifacts.httpclient.http.HttpClient; |
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21 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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22 |
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23 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler; |
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24 |
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25 public class SQKMChartServiceImpl |
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26 extends HttpServlet |
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27 { |
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28 private static final Logger log = |
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29 Logger.getLogger(FixingsKMChartServiceImpl.class); |
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30 |
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31 public static final String SERVICE_NAME = "sq-km-chart"; |
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32 |
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33 public SQKMChartServiceImpl() { |
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34 } |
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35 |
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36 public void doGet(HttpServletRequest req, HttpServletResponse resp) { |
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37 |
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38 log.info("SQKMChartServiceImpl.doGet"); |
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39 |
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40 String url = getServletContext().getInitParameter("server-url"); |
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41 String locale = req.getParameter("locale"); |
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42 String filter = req.getParameter("filter"); |
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43 |
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44 if (filter == null || filter.length() == 0) { |
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45 log.warn("Missing 'filter' parameter."); |
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46 return; |
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47 } |
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48 |
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49 if (locale == null || locale.length() == 0) { |
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50 locale = "de"; |
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51 } |
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52 |
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53 Document filterDoc = XMLUtils.jsonToXML(filter); |
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54 |
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55 if (filterDoc == null) { |
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56 log.warn("Creating filter document failed."); |
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57 return; |
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58 } |
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59 |
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60 InputStream in; |
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61 |
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62 try { |
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63 HttpClient client = new HttpClientImpl(url, locale); |
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64 in = (InputStream)client.callService( |
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65 url, // XXX: Why? The URL is passed by construction already. |
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66 SERVICE_NAME, |
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67 filterDoc, |
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68 new StreamResponseHandler()); |
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69 } |
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70 catch (ConnectionException ce) { |
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71 log.error(ce); |
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72 return; |
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73 } |
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74 |
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75 resp.setHeader("Content-Type", guessMIMEType(filterDoc)); |
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76 |
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77 try { |
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78 OutputStream out = resp.getOutputStream(); |
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79 |
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80 byte [] buf = new byte[4096]; |
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81 int i = -1; |
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82 while ((i = in.read(buf)) >= 0) { |
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83 out.write(buf, 0, i); |
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84 } |
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85 out.flush(); |
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86 } |
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87 catch (IOException ioe) { |
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88 log.error(ioe); |
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89 } |
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90 finally { |
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91 try { in.close(); } |
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92 catch (IOException ioe) { /* ignored */ } |
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93 } |
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94 } |
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95 |
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96 protected static String guessMIMEType(Document document) { |
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97 |
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98 NodeList formats = document.getElementsByTagName("format"); |
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99 |
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100 String format = "png"; |
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101 |
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102 if (formats.getLength() > 0) { |
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103 String type = ((Element)formats.item(0)).getAttribute("type"); |
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104 if (type.length() > 0) { |
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105 format = type; |
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106 } |
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107 } |
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108 |
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109 return "image/" + format; |
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110 } |
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111 } |