Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/SQKMChartServiceImpl.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
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
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
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2 * Software engineering by Intevation GmbH
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
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3 *
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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4 * This file is Free Software under the GNU AGPL (>=v3)
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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6 * documentation coming with Dive4Elements River for details.
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
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7 */
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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8
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 5834
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9 package org.dive4elements.river.client.server;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import java.io.IOException;
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14 import java.io.InputStream;
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15 import java.io.OutputStream;
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16
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17 import javax.servlet.http.HttpServlet;
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18 import javax.servlet.http.HttpServletRequest;
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19 import javax.servlet.http.HttpServletResponse;
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20
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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
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27 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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28 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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29 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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30
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31 import org.dive4elements.artifacts.httpclient.http.response.StreamResponseHandler;
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32
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33 public class SQKMChartServiceImpl
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34 extends HttpServlet
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35 {
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36 private static final Logger log =
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37 Logger.getLogger(FixingsKMChartServiceImpl.class);
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38
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39 public static final String SERVICE_NAME = "sq-km-chart";
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40
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41 public SQKMChartServiceImpl() {
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42 }
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43
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44 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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45
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46 log.info("SQKMChartServiceImpl.doGet");
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47
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48 String url = getServletContext().getInitParameter("server-url");
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49 String locale = req.getParameter("locale");
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50 String filter = req.getParameter("filter");
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51
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52 if (filter == null || filter.length() == 0) {
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53 log.warn("Missing 'filter' parameter.");
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54 return;
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55 }
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56
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57 if (locale == null || locale.length() == 0) {
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58 locale = "de";
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59 }
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60
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61 Document filterDoc = XMLUtils.jsonToXML(filter);
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62
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63 if (filterDoc == null) {
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64 log.warn("Creating filter document failed.");
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65 return;
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66 }
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67
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68 InputStream in;
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69
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70 try {
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71 HttpClient client = new HttpClientImpl(url, locale);
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72 in = (InputStream)client.callService(
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73 url, // XXX: Why? The URL is passed by construction already.
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74 SERVICE_NAME,
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75 filterDoc,
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76 new StreamResponseHandler());
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77 }
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78 catch (ConnectionException ce) {
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79 log.error(ce);
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80 return;
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81 }
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82
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83 resp.setHeader("Content-Type", guessMIMEType(filterDoc));
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84
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85 try {
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86 OutputStream out = resp.getOutputStream();
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87
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88 byte [] buf = new byte[4096];
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89 int i = -1;
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90 while ((i = in.read(buf)) >= 0) {
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91 out.write(buf, 0, i);
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92 }
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93 out.flush();
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94 }
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95 catch (IOException ioe) {
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96 log.error(ioe);
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97 }
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98 finally {
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99 try { in.close(); }
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100 catch (IOException ioe) { /* ignored */ }
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101 }
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102 }
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103
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104 protected static String guessMIMEType(Document document) {
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105
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106 NodeList formats = document.getElementsByTagName("format");
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107
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108 String format = "png";
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109
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110 if (formats.getLength() > 0) {
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111 String type = ((Element)formats.item(0)).getAttribute("type");
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112 if (type.length() > 0) {
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113 format = type;
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114 }
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115 }
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116
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117 return "image/" + format;
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118 }
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119 }
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