Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/BedloadKMChartServiceImpl.java @ 4379:8c7e76521904

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Add datacage logic for MINFO bed differences The datacage will display already calculated fixanalysis data for longitudinal section curves.
author Björn Ricks <bjoern.ricks@intevation.de>
date Fri, 02 Nov 2012 15:52:45 +0100
parents f84ed73311f2
children
rev   line source
3705
f84ed73311f2 Added UI for minfo bed quality calculation and added new services for overview
Raimund Renkert <raimund.renkert@intevation.de>
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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 }
http://dive4elements.wald.intevation.org