Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/DischargeTablesServiceImpl.java @ 8870:c26fb37899ca

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Introduced groups for modules. Modules marked with the same group-id, will be put together in the ui. Also using now the localization info from the server instead of localizing the modules again on the client side.
author gernotbelger
date Wed, 07 Feb 2018 11:59:13 +0100
parents 238fc722f87a
children 0a5239a1e46e
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.IOException;
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12 import java.io.InputStream;
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13 import java.io.OutputStream;
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14 import java.text.DateFormat;
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15 import java.util.Date;
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16 import java.util.Locale;
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17
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18 import javax.servlet.http.HttpServlet;
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19 import javax.servlet.http.HttpServletRequest;
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20 import javax.servlet.http.HttpServletResponse;
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21
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22 import org.apache.log4j.Logger;
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23 import org.w3c.dom.Document;
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24 import org.w3c.dom.Element;
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25
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26 import org.dive4elements.artifacts.common.utils.XMLUtils;
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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 import org.dive4elements.artifacts.httpclient.http.response.StreamResponseHandler;
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30
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31
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32 public class DischargeTablesServiceImpl extends HttpServlet {
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33
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34 private static final Logger log = Logger
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35 .getLogger(DischargeInfoServiceImpl.class);
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36
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37 private static final DateFormat DATE_FORMAT = DateFormat.getDateInstance(
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38 DateFormat.MEDIUM, Locale.GERMANY);
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39
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40 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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41 log.info("ChartOutputServiceImpl.doGet");
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42
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43 String url = getServletContext().getInitParameter("server-url");
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44 String locale = req.getParameter("locale");
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45
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46 prepareHeader(req, resp);
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47
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48 Document requestDoc = createRequestDoc(req);
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49
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50 HttpClient client = new HttpClientImpl(url, locale);
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51
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52 try {
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53 OutputStream out = resp.getOutputStream();
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54 InputStream stream = (InputStream) client.callService(url,
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55 "dischargetablesoverview", requestDoc,
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56 new StreamResponseHandler());
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57
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58 byte[] b = new byte[4096];
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59 try {
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60 int i;
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61 while ((i = stream.read(b)) >= 0) {
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62 out.write(b, 0, i);
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63 }
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64 }
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65 finally {
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66 stream.close();
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67 }
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68 }
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69 catch (IOException ioe) {
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70 log.error("Error while fetching discharge tables chart!", ioe);
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71 }
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72 }
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73
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74 protected void prepareHeader(HttpServletRequest req,
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75 HttpServletResponse resp) {
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76 resp.setHeader("Content-Type", "image/png");
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77 }
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78
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79 protected Document createRequestDoc(HttpServletRequest req) {
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80 Document request = XMLUtils.newDocument();
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81 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(request,
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82 null, null);
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83
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84 Element service = creator.create("service");
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85 Element gauge = creator.create("gauge");
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86 Element extent = creator.create("extent");
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87 Element format = creator.create("format");
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88 Element timerange = creator.create("timerange");
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89
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90 creator.addAttr(gauge, "name", extractRequestGauge(req));
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91 creator.addAttr(extent, "width", extractRequestWidth(req));
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92 creator.addAttr(extent, "height", extractRequestHeight(req));
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93 creator.addAttr(format, "type", extractRequestFormat(req));
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94 creator.addAttr(timerange, "lower", extractRequestLowerTime(req));
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95 creator.addAttr(timerange, "upper", extractRequestUpperTime(req));
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96
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97 request.appendChild(service);
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98 service.appendChild(gauge);
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99 service.appendChild(extent);
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100 service.appendChild(format);
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101 service.appendChild(timerange);
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102
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103 return request;
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104 }
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105
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106 protected String extractRequestGauge(HttpServletRequest req) {
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107 return req.getParameter("gauge");
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108 }
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109
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110 protected String extractRequestWidth(HttpServletRequest req) {
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111 return req.getParameter("width");
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112 }
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113
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114 protected String extractRequestHeight(HttpServletRequest req) {
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115 return req.getParameter("height");
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116 }
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117
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118 protected String extractRequestFormat(HttpServletRequest req) {
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119 return req.getParameter("format");
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120 }
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121
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122 protected String extractRequestLowerTime(HttpServletRequest req) {
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123 String lowerStr = req.getParameter("lower");
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124 try {
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125 long lowerMillis = Long.parseLong(lowerStr);
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126 Date lower = new Date(lowerMillis);
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127
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128 return DATE_FORMAT.format(lower);
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129 }
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130 catch (NumberFormatException nfe) {
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131 log.warn("Cannot parse time millies.", nfe);
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132 }
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133
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134 return null;
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135 }
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136
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137 protected String extractRequestUpperTime(HttpServletRequest req) {
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138 String upperStr = req.getParameter("upper");
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139 try {
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140 long upperMillis = Long.parseLong(upperStr);
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141 Date upper = new Date(upperMillis);
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142
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143 return DATE_FORMAT.format(upper);
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144 }
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145 catch (NumberFormatException nfe) {
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146 log.warn("Cannot parse time millies.", nfe);
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147 }
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148
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149 return null;
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150 }
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151 }
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