Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartOutputServiceImpl.java @ 280:b493d606fdef

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Enabled the client to request charts in different sizes. flys-client/trunk@1909 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 12 May 2011 09:14:46 +0000
parents 6838e4112eeb
children 8ea213bd8fba
rev   line source
78
9ca5160cf080 Added a service that builds up requests to retrieve chart images. Use this service to display charts in the ChartOutputTab.
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.OutputStream;
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4 import java.io.IOException;
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5
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6 import org.w3c.dom.Document;
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7 import org.w3c.dom.Element;
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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 de.intevation.artifacts.common.ArtifactNamespaceContext;
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14 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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15 import de.intevation.artifacts.common.utils.XMLUtils;
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16 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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17
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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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22 /**
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23 * This service is used to request a chart from the artifact server. The
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24 * response is directed directly to the output stream, so the image that is
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25 * retrieved is displayed in the UI afterwards.
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26 *
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27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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28 */
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29 public class ChartOutputServiceImpl
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30 extends HttpServlet
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31 {
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32 /** The default chart width if no value is specified in the request.*/
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33 public static final int DEFAULT_CHART_WIDTH = 600;
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34
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35 /** The default chart height if no value is specified in the request.*/
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36 public static final int DEFAULT_CHART_HEIGHT = 400;
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37
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38
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39 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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40 System.out.println("ChartOutputServiceImpl.doGet");
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42 try {
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43 OutputStream out = resp.getOutputStream();
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44
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45 String serverUrl = req.getParameter("server");
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46 String uuid = req.getParameter("uuid");
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47 String type = req.getParameter("type");
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48 String locale = req.getParameter("locale");
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49
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50 Document request = ClientProtocolUtils.newOutCollectionDocument(
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51 uuid, type, getChartAttributes(req));
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52
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53 HttpClient client = new HttpClientImpl(serverUrl, locale);
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54 client.collectionOut(request, uuid, "chart", out);
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56 out.close();
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57 out.flush();
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58 }
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59 catch (IOException ioe) {
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60 System.err.println(ioe.getMessage());
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61 }
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62 catch (Exception e) {
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63 System.err.println(e.getMessage());
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64 }
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65 }
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66
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67
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68 /**
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69 * This method returns a document which might contain parameters to adjust
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70 * chart settings. The document is created using the information that are
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71 * contained in the request object.
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72 *
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73 * @param req The request document.
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74 *
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75 * @return a document to adjust chart settings.
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76 */
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77 protected Document getChartAttributes(HttpServletRequest req) {
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78 Document doc = XMLUtils.newDocument();
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79
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80 ElementCreator ec = new ElementCreator(
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81 doc,
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82 ArtifactNamespaceContext.NAMESPACE_URI,
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83 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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84
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85 appendChartSize(req, doc, ec);
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86
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87 return doc;
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88 }
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89
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90
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91 /**
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92 * This method extracts the size (width/height) of a chart from request
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93 * object and append those values - if they exist - to the attribute
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94 * document used to adjust chart settings.
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95 *
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96 * @param req The request object that might contain the chart size.
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97 * @param doc The attribute document used to adjust chart settings.
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98 * @param ec The ElementCreator that might be used to create new Elements.
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99 */
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100 protected void appendChartSize(
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101 HttpServletRequest req,
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102 Document doc,
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103 ElementCreator ec)
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104 {
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105 Element size = ec.create("size");
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106
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107 String width = req.getParameter("width");
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108 String height = req.getParameter("height");
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109
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110 if (width == null || height == null) {
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111 width = Integer.toString(DEFAULT_CHART_WIDTH);
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112 height = Integer.toString(DEFAULT_CHART_HEIGHT);
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113 }
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114
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115 ec.addAttr(size, "width", width, true);
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116 ec.addAttr(size, "height", height, true);
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117
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118 doc.appendChild(size);
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119 }
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120 }
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121 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org