Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DischargeTablesServiceImpl.java @ 4740:fb135e1dfa35

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Added 'type' attribute to <dc:variable/> element. If an optional 'type' attribute is given the result of the XPATH expression is interpreted as this type. Valid values are 'number', 'bool', 'node' and 'nodeset'. All other defaults to 'string' which also is the default if nor type is given.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 15:31:53 +0100
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;
6ae99d996f79 flys/issue903: Display the discharge tables of the selected gauge as chart in historical discharge calculation.
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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 }
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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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