Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/BedloadKMChartServiceImpl.java @ 9801:1d7a72a50183 3.2.x tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Assume Compose V2, consistently
author Tom Gottfried <tom@intevation.de>
date Thu, 23 Nov 2023 10:14:13 +0100
parents 0a5239a1e46e
children
rev   line source
5861
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
diff changeset
1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.client.server;
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10
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11 import java.io.IOException;
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12 import java.io.InputStream;
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13 import java.io.OutputStream;
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14
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15 import javax.servlet.http.HttpServlet;
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16 import javax.servlet.http.HttpServletRequest;
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17 import javax.servlet.http.HttpServletResponse;
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18
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19 import org.apache.logging.log4j.Logger;
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20 import org.apache.logging.log4j.LogManager;
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21 import org.w3c.dom.Document;
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22 import org.w3c.dom.Element;
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23 import org.w3c.dom.NodeList;
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24
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25 import org.dive4elements.artifacts.common.utils.XMLUtils;
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26 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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27 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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28 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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29 import org.dive4elements.artifacts.httpclient.http.response.StreamResponseHandler;
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30
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31 public class BedloadKMChartServiceImpl extends HttpServlet {
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32 private static final Logger log =
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33 LogManager.getLogger(FixingsKMChartServiceImpl.class);
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34
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35 public static final String SERVICE_NAME = "bedload-km-chart";
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36
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37 public BedloadKMChartServiceImpl() {
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38 }
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39
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40 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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41
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42 log.info("BedloadKMChartServiceImpl.doGet");
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43
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44 String url = getServletContext().getInitParameter("server-url");
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45 String locale = req.getParameter("locale");
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46 String filter = req.getParameter("filter");
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47
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48 if (filter == null || filter.length() == 0) {
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49 log.warn("Missing 'filter' parameter.");
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50 return;
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51 }
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52
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53 if (locale == null || locale.length() == 0) {
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54 locale = "de";
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55 }
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56
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57 Document filterDoc = XMLUtils.jsonToXML(filter);
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58
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59 if (filterDoc == null) {
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60 log.warn("Creating filter document failed.");
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61 return;
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62 }
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63
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64 InputStream in;
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65
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66 try {
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67 HttpClient client = new HttpClientImpl(url, locale);
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68 in = (InputStream)client.callService(
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69 url, // XXX: Why? The URL is passed by construction already.
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70 SERVICE_NAME,
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71 filterDoc,
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72 new StreamResponseHandler());
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73 }
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74 catch (ConnectionException ce) {
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75 log.error(ce);
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76 return;
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77 }
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78
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79 resp.setHeader("Content-Type", guessMIMEType(filterDoc));
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80
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81 try {
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82 OutputStream out = resp.getOutputStream();
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83
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84 byte [] buf = new byte[4096];
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85 int i = -1;
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86 while ((i = in.read(buf)) >= 0) {
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87 out.write(buf, 0, i);
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88 }
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89 out.flush();
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90 }
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91 catch (IOException ioe) {
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92 log.error(ioe);
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93 }
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94 finally {
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95 try { in.close(); }
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96 catch (IOException ioe) { /* ignored */ }
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97 }
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98 }
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99
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100 protected static String guessMIMEType(Document document) {
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101
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102 NodeList formats = document.getElementsByTagName("format");
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103
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104 String format = "png";
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105
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106 if (formats.getLength() > 0) {
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107 String type = ((Element)formats.item(0)).getAttribute("type");
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108 if (type.length() > 0) {
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109 format = type;
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110 }
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111 }
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112
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113 return "image/" + format;
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114 }
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115 }
http://dive4elements.wald.intevation.org