Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MetaDataService.java @ 974:30c85cb33a50

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meta data service: made artifact optional and allow passing extra parameters. flys-artifacts/trunk@2400 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 25 Jul 2011 11:05:33 +0000
parents e456aca4eb7b
children a111f0984706
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:meta/art:uuid/@value";
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46 public static final String XPATH_OUTS = "/art:meta/art:outs/@value";
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47 public static final String XPATH_PARAMETERS = "/art:meta/art:parameters/@value";
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48 public static final String XPATH_FILTERS = "/art:meta/art:filters/@value";
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49
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50 /** The global context key of the artifact database */
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51 public static final String ARTIFACT_DATA_BASE_KEY =
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52 "global.artifact.database";
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53
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54 public MetaDataService() {
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55 }
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56
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57 protected static Map<String, Object> extractParameters(Document data) {
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58 HashMap<String, Object> parameters = new HashMap<String, Object>();
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59
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60 String river = XMLUtils.xpathString(
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61 data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
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62
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63 if (river == null || (river = river.trim()).length() == 0) {
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64 river = "%"; // matches all rivers
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65 }
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66
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67 parameters.put("river", river);
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68
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69 return parameters;
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70 }
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71
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72 /** The old service. To be removed. */
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73 protected Document oldService(Document data) {
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74
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75 final Document result = XMLUtils.newDocument();
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76
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77 final Builder builder = DataCage.getInstance().getBuilder();
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78
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79 if (builder == null) {
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80 log.error("MetaDataService is not setup properly.");
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81 return result;
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82 }
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83
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84 final Map<String, Object> parameters = extractParameters(data);
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85
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86 Session session = SessionHolder.acquire();
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87 try {
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88 session.doWork(new Work() {
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89 @Override
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90 public void execute(Connection connection)
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91 throws SQLException
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92 {
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93 log.debug("MetaDataService.execute");
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94 builder.build(connection, result, parameters);
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95 }
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96 });
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97 }
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98 finally {
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99 session.close();
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100 SessionHolder.release();
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101 }
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102
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103 return result;
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104 }
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105
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106 protected static Map<String, Object> parameters(
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107 String parameters,
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108 Map<String, Object> data
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109 ) {
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110 if (parameters != null) {
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111 String [] parts = parameters.split("\\s*;\\s*");
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112 for (String part: parts) {
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113 String [] kv = part.split("\\s*:\\s*");
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114 if (kv.length < 2 || (kv[0] = kv[0].trim()).length() == 0) {
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115 continue;
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116 }
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117 String [] values = kv[1].split("\\s*,\\s*");
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118 data.put(kv[0], values.length == 1 ? values[0] : values);
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119 }
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120 }
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121 return data;
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122 }
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123
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124 protected static Map<String, Object> filters(
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125 String filters,
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126 Map<String, Object> data
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127 ) {
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128 if (filters != null) {
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129 for (String filter: filters.split("\\s*,\\*s")) {
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130 data.put(filter, "true");
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131 }
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132 }
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133 return data;
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134 }
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135
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136 protected Document newService(
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137 String uuid,
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138 String outsString,
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139 String parameters,
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140 String filters,
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141 GlobalContext globalContext
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142 ) {
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143 Document result = XMLUtils.newDocument();
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144
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145 FLYSArtifact flysArtifact;
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146
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147 log.debug("uuid: " + uuid);
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148 log.debug("outs: " + outsString);
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149 log.debug("filters: " + filters);
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150
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151 if (uuid != null && uuid.length() != 0) {
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152 if (!StringUtils.checkUUID(uuid)) {
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153 log.warn("'" + uuid + "' is not a UUID");
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154 return result;
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155 }
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156
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157 Object dbObject =
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158 (ArtifactDatabase)globalContext.get(ARTIFACT_DATA_BASE_KEY);
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159
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160 if (!(dbObject instanceof ArtifactDatabase)) {
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161 log.error("Cannot find artifact database");
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162 return result;
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163 }
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164
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165 ArtifactDatabase db = (ArtifactDatabase)dbObject;
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166
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167 Artifact artifact;
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168
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169 try {
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170 artifact = db.getRawArtifact(uuid);
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171 }
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172 catch (ArtifactDatabaseException adbe) {
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173 log.warn("fetching artifact failed", adbe);
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174 return result;
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175 }
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176
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177 if (!(artifact instanceof FLYSArtifact)) {
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178 log.warn("artifact is not a FLYS artifact.");
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179 return result;
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180 }
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181
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182 flysArtifact = (FLYSArtifact)artifact;
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183 }
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184 else {
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185 flysArtifact = null;
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186 }
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187
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188 Map<String, Object> data =
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189 filters(filters,
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190 parameters(parameters,
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191 new HashMap<String, Object>()));
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192
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193 String [] outs = outsString.split("\\s*,\\s*");
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194
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195 DataCage dc = DataCage.getInstance();
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196
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197 dc.recommend(flysArtifact, outs, data, result);
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198
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199 return result;
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200 }
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201
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202 @Override
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203 public Document process(
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204 Document data,
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205 GlobalContext globalContext,
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206 CallMeta callMeta
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207 ) {
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208 log.debug("MetaDataService.process");
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209
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210 String uuid = XMLUtils.xpathString(
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211 data, XPATH_UUID, ArtifactNamespaceContext.INSTANCE);
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212
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213 String outs = XMLUtils.xpathString(
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214 data, XPATH_OUTS, ArtifactNamespaceContext.INSTANCE);
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215
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216 String parameters = XMLUtils.xpathString(
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217 data, XPATH_PARAMETERS, ArtifactNamespaceContext.INSTANCE);
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218
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219 String filters = XMLUtils.xpathString(
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diff changeset
220 data, XPATH_FILTERS, ArtifactNamespaceContext.INSTANCE);
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221
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222 return outs != null
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223 ? newService(uuid, outs, parameters, filters, globalContext)
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224 : oldService(data);
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225 }
372
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226 }
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227 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org