Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DischargeTablesServiceImpl.java @ 5738:54077c9c9305

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Backend: Fix Stack overflow.
author Sascha L. Teichmann <teichmann@intevation.de>
date Tue, 16 Apr 2013 18:55:52 +0200
parents 6ae99d996f79
children
rev   line source
4218
6ae99d996f79 flys/issue903: Display the discharge tables of the selected gauge as chart in historical discharge calculation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.client.server;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.io.OutputStream;
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6 import java.text.DateFormat;
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7 import java.util.Date;
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8 import java.util.Locale;
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9
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10 import javax.servlet.http.HttpServlet;
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11 import javax.servlet.http.HttpServletRequest;
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12 import javax.servlet.http.HttpServletResponse;
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13
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14 import org.apache.log4j.Logger;
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15 import org.w3c.dom.Document;
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16 import org.w3c.dom.Element;
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17
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18 import de.intevation.artifacts.common.utils.XMLUtils;
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19 import de.intevation.artifacts.httpclient.http.HttpClient;
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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21 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler;
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22
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23
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24 public class DischargeTablesServiceImpl extends HttpServlet {
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25
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26 private static final Logger logger = Logger
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27 .getLogger(DischargeInfoServiceImpl.class);
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28
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29 private static final DateFormat DATE_FORMAT = DateFormat.getDateInstance(
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30 DateFormat.MEDIUM, Locale.GERMANY);
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31
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32 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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33 logger.info("ChartOutputServiceImpl.doGet");
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34
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35 String url = getServletContext().getInitParameter("server-url");
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36 String locale = req.getParameter("locale");
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37
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38 prepareHeader(req, resp);
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39
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40 Document requestDoc = createRequestDoc(req);
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41
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42 HttpClient client = new HttpClientImpl(url, locale);
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43
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44 try {
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45 OutputStream out = resp.getOutputStream();
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46 InputStream stream = (InputStream) client.callService(url,
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47 "dischargetablesoverview", requestDoc,
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48 new StreamResponseHandler());
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49
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50 byte[] b = new byte[4096];
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51 try {
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52 int i;
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53 while ((i = stream.read(b)) >= 0) {
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54 out.write(b, 0, i);
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55 }
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56 }
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57 finally {
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58 stream.close();
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59 }
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60 }
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61 catch (IOException ioe) {
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62 logger.error("Error while fetching discharge tables chart!", ioe);
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63 }
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64 }
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65
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66 protected void prepareHeader(HttpServletRequest req,
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67 HttpServletResponse resp) {
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68 resp.setHeader("Content-Type", "image/png");
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69 }
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70
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71 protected Document createRequestDoc(HttpServletRequest req) {
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72 Document request = XMLUtils.newDocument();
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73 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(request,
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74 null, null);
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75
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76 Element service = creator.create("service");
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77 Element gauge = creator.create("gauge");
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78 Element extent = creator.create("extent");
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79 Element format = creator.create("format");
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80 Element timerange = creator.create("timerange");
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81
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82 creator.addAttr(gauge, "name", extractRequestGauge(req));
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83 creator.addAttr(extent, "width", extractRequestWidth(req));
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84 creator.addAttr(extent, "height", extractRequestHeight(req));
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85 creator.addAttr(format, "type", extractRequestFormat(req));
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86 creator.addAttr(timerange, "lower", extractRequestLowerTime(req));
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87 creator.addAttr(timerange, "upper", extractRequestUpperTime(req));
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88
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89 request.appendChild(service);
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90 service.appendChild(gauge);
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91 service.appendChild(extent);
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92 service.appendChild(format);
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93 service.appendChild(timerange);
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94
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95 return request;
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96 }
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97
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98 protected String extractRequestGauge(HttpServletRequest req) {
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99 return req.getParameter("gauge");
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100 }
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101
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102 protected String extractRequestWidth(HttpServletRequest req) {
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103 return req.getParameter("width");
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104 }
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105
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106 protected String extractRequestHeight(HttpServletRequest req) {
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107 return req.getParameter("height");
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108 }
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109
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110 protected String extractRequestFormat(HttpServletRequest req) {
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111 return req.getParameter("format");
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112 }
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113
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114 protected String extractRequestLowerTime(HttpServletRequest req) {
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115 String lowerStr = req.getParameter("lower");
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116 try {
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117 long lowerMillis = Long.parseLong(lowerStr);
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118 Date lower = new Date(lowerMillis);
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119
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120 return DATE_FORMAT.format(lower);
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121 }
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122 catch (NumberFormatException nfe) {
6ae99d996f79 flys/issue903: Display the discharge tables of the selected gauge as chart in historical discharge calculation.
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123 logger.warn("Cannot parse time millies.", nfe);
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124 }
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125
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126 return null;
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127 }
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128
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129 protected String extractRequestUpperTime(HttpServletRequest req) {
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130 String upperStr = req.getParameter("upper");
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131 try {
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132 long upperMillis = Long.parseLong(upperStr);
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133 Date upper = new Date(upperMillis);
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134
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135 return DATE_FORMAT.format(upper);
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136 }
6ae99d996f79 flys/issue903: Display the discharge tables of the selected gauge as chart in historical discharge calculation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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137 catch (NumberFormatException nfe) {
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138 logger.warn("Cannot parse time millies.", nfe);
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139 }
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140
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141 return null;
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142 }
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143 }
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