Mercurial > dive4elements > river

annotate flys-client/src/main/java/org/dive4elements/river/client/server/SQKMChartServiceImpl.java @ 5835:821a02bbfb4e

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Fixed internal java dependencies
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 13:12:15 +0200
parents f507086aa94b
children
rev   line source
5835
821a02bbfb4e Fixed internal java dependencies
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5834
diff changeset
1 package org.dive4elements.river.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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821a02bbfb4e Fixed internal java dependencies
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parents: 5834
diff changeset
17 import org.dive4elements.artifacts.common.utils.XMLUtils;
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18
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19 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
821a02bbfb4e Fixed internal java dependencies
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parents: 5834
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20 import org.dive4elements.artifacts.httpclient.http.HttpClient;
821a02bbfb4e Fixed internal java dependencies
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parents: 5834
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21 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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22
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821a02bbfb4e Fixed internal java dependencies
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parents: 5834
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23 import org.dive4elements.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 }
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