Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/BedloadKMChartServiceImpl.java @ 4798:39885bdfc6fc
Added calculation of the "Umhuellende" to calculation of "W fuer ungleichwertige Abfluesse".
This is done by figuring out the WST columns that imfold the data and then do
simple "gleichwertige" calculations from the start of the interval. This
is too much because only the Qs are needed for the "Umhuellende".
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 13 Jan 2013 16:18:28 +0100 |
parents | f84ed73311f2 |
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rev | line source |
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3705
f84ed73311f2
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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 } |