Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/ChartOutputServiceImpl.java @ 7136:fd8b27cdf498

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issue971: Let ChartOutputServiceImpl interprete an "encoding" parameter.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 25 Sep 2013 11:48:54 +0200
parents 7c3cab9330c4
children 6b278187ed9d
rev   line source
5861
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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Sascha L. Teichmann <teichmann@intevation.de>
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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.log4j.Logger;
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19
78
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20 import javax.servlet.http.HttpServlet;
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21 import javax.servlet.http.HttpServletRequest;
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22 import javax.servlet.http.HttpServletResponse;
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23
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24 import org.dive4elements.artifacts.common.utils.ClientProtocolUtils;
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25
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26 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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27 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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28
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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29
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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30 /**
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31 * This service is used to request a chart from the artifact server. The
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
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32 * response is directed directly to the output stream. This can be used
Felix Wolfsteller <felix.wolfsteller@intevation.de>
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33 * to stream an image that is displayed in the UI afterwards.
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34 *
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35 * Note that a chart output can also be a csv file.
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36 *
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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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38 */
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39 public class ChartOutputServiceImpl
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40 extends HttpServlet
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41 {
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42 private static final Logger logger =
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43 Logger.getLogger(ChartOutputServiceImpl.class);
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44
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45
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
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46 /** Handle a get, collectionOut. */
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47 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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48 logger.info("ChartOutputServiceImpl.doGet");
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49
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50 try {
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51 OutputStream out = resp.getOutputStream();
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52
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53 String url = getServletContext().getInitParameter("server-url");
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54
7136
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55 String uuid = req.getParameter("uuid");
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56 String type = req.getParameter("type");
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57 String locale = req.getParameter("locale");
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58 String encoding = req.getParameter("encoding");
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59
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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(prepareChartAttributes(req)));
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65
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66 HttpClient client = new HttpClientImpl(url, locale);
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67
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68 if (encoding != null) {
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69 try {
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70 client.setOutEncoding(
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71 java.nio.charset.Charset.forName(encoding));
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72 }
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73 catch(java.nio.charset.UnsupportedCharsetException e) {
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74 logger.warn("Unsupported encoding: " + encoding);
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75 }
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76 }
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77 client.collectionOut(request, uuid, "chart", out);
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78
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79 out.close();
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80 out.flush();
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81 }
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82 catch (IOException ioe) {
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83 logger.error(ioe, ioe);
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84 }
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85 catch (Exception e) {
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86 logger.error(e, e);
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87 }
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88 }
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89
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90
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91 protected Map<String, String> prepareChartAttributes(HttpServletRequest req) {
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92 Map<String, String> attr = new HashMap<String, String>();
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93
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94 Map params = req.getParameterMap();
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95
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96 attr.put("width", req.getParameter("width"));
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97 attr.put("height", req.getParameter("height"));
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98 attr.put("minx", req.getParameter("minx"));
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99 attr.put("maxx", req.getParameter("maxx"));
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100 attr.put("miny", req.getParameter("miny"));
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101 attr.put("maxy", req.getParameter("maxy"));
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102 attr.put("format", req.getParameter("format"));
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103 attr.put("km", req.getParameter("currentKm"));
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104
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105 if (logger.isDebugEnabled()) {
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106 logger.debug("====== ZOOM VALUES =======");
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107 logger.debug(" min x: " + req.getParameter("minx"));
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108 logger.debug(" max x: " + req.getParameter("maxx"));
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109 logger.debug(" min y: " + req.getParameter("miny"));
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110 logger.debug(" max y: " + req.getParameter("maxy"));
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111 }
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112
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113 return attr;
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114 }
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115
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116
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117 protected void prepareHeader(
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118 HttpServletRequest req,
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119 HttpServletResponse resp
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120 ) {
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121 String export = req.getParameter("export");
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122
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123 if (export != null && export.equals("true")) {
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124 String format = req.getParameter("format");
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125
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126 if (format == null || format.length() == 0) {
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127 format = "png";
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128 }
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129
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130 String fn = "chart_export" + getFileExtension(format);
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131
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132 resp.setHeader("Content-Disposition", "attachment;filename=" + fn);
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133 resp.setHeader("Content-Type", getMimeType(format));
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134 }
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135 }
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136
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137
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138 protected String getFileExtension(String format) {
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139 if (format.equals("png")) {
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140 return ".png";
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141 }
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142 else if (format.equals("pdf")) {
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143 return ".pdf";
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144 }
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145 else if (format.equals("svg")) {
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146 return ".svg";
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147 }
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148 else if (format.equals("csv")) {
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149 return ".csv";
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150 }
1344
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151
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152 return ".png";
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153 }
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154
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155
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156 protected String getMimeType(String format) {
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157 if (format.equals("png")) {
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158 return "image/png";
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159 }
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160 else if (format.equals("pdf")) {
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161 return "application/pdf";
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162 }
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163 else if (format.equals("svg")) {
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164 return "svg+xml";
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165 }
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166 else if (format.equals("csv")) {
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167 return "text/plain";
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168 }
1344
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169
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170 return "image/png";
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171 }
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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172 }
280
b493d606fdef Enabled the client to request charts in different sizes.
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173 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org