Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/ChartOutputServiceImpl.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
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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.OutputStream;
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12 import java.io.IOException;
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13 import java.util.HashMap;
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14 import java.util.Map;
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15
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16 import org.w3c.dom.Document;
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17
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18 import org.apache.logging.log4j.Logger;
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19 import org.apache.logging.log4j.LogManager;
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21 import javax.servlet.http.HttpServlet;
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22 import javax.servlet.http.HttpServletRequest;
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23 import javax.servlet.http.HttpServletResponse;
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24
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25 import org.dive4elements.artifacts.common.utils.ClientProtocolUtils;
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26
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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
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30
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31 /**
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32 * This service is used to request a chart from the artifact server. The
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33 * response is directed directly to the output stream. This can be used
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34 * to stream an image that is displayed in the UI afterwards.
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35 *
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36 * Note that a chart output can also be a csv file.
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37 *
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38 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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39 */
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40 public class ChartOutputServiceImpl
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41 extends HttpServlet
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42 {
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43 private static final Logger log =
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44 LogManager.getLogger(ChartOutputServiceImpl.class);
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45
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46
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47 /** Handle a get, collectionOut. */
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48 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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49 log.info("ChartOutputServiceImpl.doGet");
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50
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51 try {
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52 OutputStream out = resp.getOutputStream();
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53
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54 String url = getServletContext().getInitParameter("server-url");
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55
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56 String uuid = req.getParameter("uuid");
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57 String type = req.getParameter("type");
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58 String locale = req.getParameter("locale");
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60 prepareHeader(req, resp);
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61
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62 Document request = ClientProtocolUtils.newOutCollectionDocument(
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63 uuid, type, type,
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64 ChartServiceHelper.getChartAttributes(
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65 prepareChartAttributes(req)));
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67 HttpClient client = new HttpClientImpl(url, locale);
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68
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69 client.collectionOut(request, uuid, "chart", out);
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70
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71 out.close();
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72 out.flush();
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73 }
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74 catch (IOException ioe) {
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75 log.error(ioe, ioe);
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76 }
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77 catch (Exception e) {
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78 log.error(e, e);
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79 }
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80 }
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81
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82
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83 protected Map<String, String> prepareChartAttributes(
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84 HttpServletRequest req
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85 ) {
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86 Map<String, String> attr = new HashMap<String, String>();
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87
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88 Map params = req.getParameterMap();
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89
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90 attr.put("width", req.getParameter("width"));
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91 attr.put("height", req.getParameter("height"));
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92 attr.put("minx", req.getParameter("minx"));
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93 attr.put("maxx", req.getParameter("maxx"));
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94 attr.put("miny", req.getParameter("miny"));
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95 attr.put("maxy", req.getParameter("maxy"));
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96 attr.put("format", req.getParameter("format"));
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97 attr.put("km", req.getParameter("currentKm"));
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98
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99 if (log.isDebugEnabled()) {
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100 log.debug("====== ZOOM VALUES =======");
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101 log.debug(" min x: " + req.getParameter("minx"));
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102 log.debug(" max x: " + req.getParameter("maxx"));
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103 log.debug(" min y: " + req.getParameter("miny"));
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104 log.debug(" max y: " + req.getParameter("maxy"));
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105 }
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106
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107 return attr;
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108 }
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111 protected void prepareHeader(
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112 HttpServletRequest req,
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113 HttpServletResponse resp
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114 ) {
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115 String export = req.getParameter("export");
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116
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117 if (export != null && export.equals("true")) {
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118 String format = req.getParameter("format");
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119
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120 if (format == null || format.length() == 0) {
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121 format = "png";
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122 }
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123
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124 String fn = "chart_export" + getFileExtension(format);
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125
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126 resp.setHeader("Content-Disposition", "attachment;filename=" + fn);
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127 resp.setHeader("Content-Type", getMimeType(format));
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128 }
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129 }
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130
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131
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132 protected String getFileExtension(String format) {
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133 if (format.equals("png")) {
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134 return ".png";
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135 }
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136 else if (format.equals("pdf")) {
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137 return ".pdf";
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138 }
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139 else if (format.equals("svg")) {
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140 return ".svg";
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141 }
1587
45cd2364adad Issue 466.
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142 else if (format.equals("csv")) {
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143 return ".csv";
45cd2364adad Issue 466.
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144 }
1344
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145
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146 return ".png";
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147 }
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148
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149
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150 protected String getMimeType(String format) {
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151 if (format.equals("png")) {
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152 return "image/png";
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153 }
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154 else if (format.equals("pdf")) {
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155 return "application/pdf";
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156 }
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157 else if (format.equals("svg")) {
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158 return "svg+xml";
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159 }
1587
45cd2364adad Issue 466.
Raimund Renkert <raimund.renkert@intevation.de>
parents: 1425
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160 else if (format.equals("csv")) {
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Raimund Renkert <raimund.renkert@intevation.de>
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161 return "text/plain";
45cd2364adad Issue 466.
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parents: 1425
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162 }
1344
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163
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164 return "image/png";
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165 }
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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parents:
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166 }
280
b493d606fdef Enabled the client to request charts in different sizes.
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167 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org