Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MetaDataService.java @ 970:e456aca4eb7b

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meta data service: Adjusted to use the DataCage recommendations. flys-artifacts/trunk@2395 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 22 Jul 2011 10:41:30 +0000
parents 2c8fc60125b9
children 30c85cb33a50
rev   line source
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1 package de.intevation.flys.artifacts.services;
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2
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3 import java.sql.Connection;
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4 import java.sql.SQLException;
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5
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6 import org.w3c.dom.Document;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import java.util.Map;
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11 import java.util.HashMap;
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12
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13 import de.intevation.artifacts.Artifact;
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14 import de.intevation.artifacts.CallMeta;
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15 import de.intevation.artifacts.GlobalContext;
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16 import de.intevation.artifacts.ArtifactDatabase;
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17 import de.intevation.artifacts.ArtifactDatabaseException;
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18
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19 import de.intevation.artifactdatabase.DefaultService;
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20
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22 import de.intevation.artifacts.common.utils.StringUtils;
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23
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24 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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25
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26 import de.intevation.flys.artifacts.services.meta.Builder;
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27 import de.intevation.flys.artifacts.services.meta.DataCage;
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28
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29 import de.intevation.flys.artifacts.FLYSArtifact;
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30
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31 import de.intevation.flys.backend.SessionHolder;
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32
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33 import org.hibernate.Session;
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34
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35 import org.hibernate.jdbc.Work;
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36
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37 public class MetaDataService
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38 extends DefaultService
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39 {
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40 private static Logger log = Logger.getLogger(MetaDataService.class);
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41
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42 // old service. To be removed
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43 public static final String XPATH_RIVER = "/art:river/text()";
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44
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45 public static final String XPATH_UUID = "/art:uuid/@value";
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46 public static final String XPATH_OUTS = "/art:outs/@value";
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47 public static final String XPATH_FILTERS = "/art:filters/@value";
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48
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49 /** The global context key of the artifact database */
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50 public static final String ARTIFACT_DATA_BASE_KEY =
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51 "global.artifact.database";
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52
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53 public MetaDataService() {
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54 }
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55
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56 protected static Map<String, Object> extractParameters(Document data) {
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57 HashMap<String, Object> parameters = new HashMap<String, Object>();
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58
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59 String river = XMLUtils.xpathString(
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60 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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61
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62 if (river == null || (river = river.trim()).length() == 0) {
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63 river = "%"; // matches all rivers
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64 }
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65
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66 parameters.put("river", river);
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67
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68 return parameters;
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69 }
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70
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71 /** The old service. To be removed. */
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72 protected Document oldService(Document data) {
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73
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74 final Document result = XMLUtils.newDocument();
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75
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76 final Builder builder = DataCage.getInstance().getBuilder();
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77
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78 if (builder == null) {
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79 log.error("MetaDataService is not setup properly.");
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80 return result;
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81 }
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82
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83 final Map<String, Object> parameters = extractParameters(data);
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84
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85 Session session = SessionHolder.acquire();
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86 try {
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87 session.doWork(new Work() {
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88 @Override
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89 public void execute(Connection connection)
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90 throws SQLException
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91 {
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92 log.debug("MetaDataService.execute");
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93 builder.build(connection, result, parameters);
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94 }
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95 });
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96 }
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97 finally {
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98 session.close();
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99 SessionHolder.release();
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100 }
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101
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102 return result;
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103 }
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104
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105 protected Document newService(
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106 String uuid,
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107 String outsString,
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108 String filters,
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109 GlobalContext globalContext
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110 ) {
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111 Document result = XMLUtils.newDocument();
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112
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113 if (!StringUtils.checkUUID(uuid)) {
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114 log.warn("'" + uuid + "' is not a UUID");
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115 return result;
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116 }
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117
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118 Object dbObject =
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119 (ArtifactDatabase)globalContext.get(ARTIFACT_DATA_BASE_KEY);
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120
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121 if (!(dbObject instanceof ArtifactDatabase)) {
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122 log.error("Cannot find artifact database");
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123 return result;
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124 }
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125
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126 ArtifactDatabase db = (ArtifactDatabase)dbObject;
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127
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128 Artifact artifact;
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129
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130 try {
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131 artifact = db.getRawArtifact(uuid);
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132 }
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133 catch (ArtifactDatabaseException adbe) {
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134 log.warn("fetching artifact failed", adbe);
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135 return result;
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136 }
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137
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138 if (!(artifact instanceof FLYSArtifact)) {
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139 log.warn("artifact is not a FLYS artifact.");
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140 return result;
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141 }
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142
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143 FLYSArtifact flysArtifact = (FLYSArtifact)artifact;
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144
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145 String [] outs = outsString.split("\\s*,\\s*");
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146
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147 Map<String, Object> extras;
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148
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149 if (filters != null) {
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150 extras = new HashMap<String, Object>();
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151 for (String filter: filters.split("\\s*,\\*s")) {
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152 extras.put(filter, "true");
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153 }
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154 }
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155 else {
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156 extras = null;
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157 }
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158
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159 DataCage dc = DataCage.getInstance();
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160
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161 dc.recommend(flysArtifact, outs, extras, result);
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162
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163 return result;
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164 }
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165
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166 @Override
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167 public Document process(
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168 Document data,
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169 GlobalContext globalContext,
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170 CallMeta callMeta
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171 ) {
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172 log.debug("MetaDataService.process");
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173
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174 String uuid = XMLUtils.xpathString(
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175 data, XPATH_UUID, ArtifactNamespaceContext.INSTANCE);
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176
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177 String outs = XMLUtils.xpathString(
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178 data, XPATH_OUTS, ArtifactNamespaceContext.INSTANCE);
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179
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180 String filters = XMLUtils.xpathString(
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181 data, XPATH_FILTERS, ArtifactNamespaceContext.INSTANCE);
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182
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183 return uuid != null && outs != null
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184 ? newService(uuid, outs, filters, globalContext)
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185 : oldService(data);
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186 }
372
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187 }
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188 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org