Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/GaugeInfoService.java @ 5639:db4e7ff0b987

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author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 10 Apr 2013 09:27:18 +0200
parents 5e7da178daa6
children
rev   line source
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fb7975828ffa #544 Added a service that allows querying gauge information.
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import org.w3c.dom.Document;
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7 import org.w3c.dom.Element;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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12 import de.intevation.artifacts.common.utils.XMLUtils;
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13 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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14
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15 import de.intevation.artifacts.CallMeta;
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16 import de.intevation.artifacts.GlobalContext;
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17
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18 import de.intevation.flys.model.Gauge;
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19 import de.intevation.flys.model.Range;
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20 import de.intevation.flys.model.River;
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21
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22 import de.intevation.flys.artifacts.model.RiverFactory;
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23
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24
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25 /**
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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27 */
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28 public class GaugeInfoService extends FLYSService {
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29
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30 interface Filter {
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31 boolean apply(Gauge gauge);
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32 }
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33
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34
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35 private static final class ReferenceNumberFilter implements Filter {
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36 private long refNr;
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37
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38 public ReferenceNumberFilter(long refNr) {
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39 this.refNr = refNr;
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40 }
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41
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42 @Override
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43 public boolean apply(Gauge gauge) {
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44 if (logger.isDebugEnabled()) {
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45 logger.debug("Test gauge '" + gauge.getName() + "'");
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46 }
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47
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48 return gauge != null && gauge.getOfficialNumber() == refNr;
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49 }
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50 } // end of ReferenceNumberFilter class
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51
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52
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53 /** The logger that is used by this service.*/
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54 private static Logger logger = Logger.getLogger(GaugeInfoService.class);
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55
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56
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57 public static final String XPATH_RIVERNAME = "/art:river/@name";
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58
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59 public static final String XPATH_REFERENCE_NR
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60 = "/art:river/art:filter/art:gauge/text()";
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61
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62
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63 public GaugeInfoService() {
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64 }
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65
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66
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67 @Override
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68 public Document doProcess(
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69 Document data,
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70 GlobalContext context,
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71 CallMeta callMeta
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72 ) {
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73 logger.debug("GaugeInfoService.process");
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74
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75 if (logger.isDebugEnabled()) {
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76 logger.debug(XMLUtils.toString(data));
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77 }
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78
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79 River river = getRiverFromRequest(data);
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80
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81 List<Filter> filters = getFilters(data);
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82 List<Gauge> allGauges = river.getGauges();
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83 List<Gauge> filtered = new ArrayList<Gauge>();
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84
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85 for (Gauge g: allGauges) {
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86 for (Filter f: filters) {
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87 if (f.apply(g)) {
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88 filtered.add(g);
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89 break;
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90 }
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91 }
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92 }
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93
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94 return buildInfoDocument(filtered);
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95 }
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96
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97
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98 protected River getRiverFromRequest(Document data) {
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99 String rivername = XMLUtils.xpathString(
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100 data,
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101 XPATH_RIVERNAME,
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102 ArtifactNamespaceContext.INSTANCE);
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103
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104 logger.debug("Return Gauge info for River '" + rivername + "'");
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105
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106 return rivername != null ? RiverFactory.getRiver(rivername) : null;
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107 }
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108
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109
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110 protected List<Filter> getFilters(Document data) {
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111 List<Filter> filters = new ArrayList<Filter>();
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112
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113 String refNr = XMLUtils.xpathString(
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114 data,
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115 XPATH_REFERENCE_NR,
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116 ArtifactNamespaceContext.INSTANCE);
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117
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118 if (refNr != null && refNr.length() > 0) {
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119 try {
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120 filters.add(
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121 new ReferenceNumberFilter(Long.parseLong(refNr)));
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122 }
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123 catch (NumberFormatException nfe) {
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124 logger.warn(nfe, nfe);
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125 }
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126 }
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127
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128 return filters;
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129 }
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130
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131
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132 protected Document buildInfoDocument(List<Gauge> gauges) {
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133 Document doc = XMLUtils.newDocument();
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134
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135 ElementCreator cr = new ElementCreator(
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136 doc,
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137 ArtifactNamespaceContext.NAMESPACE_URI,
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138 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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139
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140 Element service = cr.create("service");
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141
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142 logger.debug("Append " + gauges.size() + " gauges to info doc.");
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143
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144 for (Gauge g: gauges) {
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145 Range r = g.getRange();
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146
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147 Element el = cr.create("gauge");
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148 cr.addAttr(el, "name", g.getName());
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149 cr.addAttr(el, "lower", String.valueOf(r.getA().doubleValue()));
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150 cr.addAttr(el, "upper", String.valueOf(r.getB().doubleValue()));
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151
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152 service.appendChild(el);
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153 }
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154
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155 doc.appendChild(service);
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156
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157 return doc;
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158 }
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159 }
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160 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org