Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MetaDataService.java @ 4589:afd817b006b7

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Documentation added.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 29 Nov 2012 10:27:31 +0100
parents b70dedac4c7e
children 9bddb6f5baa0
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 org.w3c.dom.Document;
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4
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5 import org.apache.log4j.Logger;
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6
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7 import java.util.Map;
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8 import java.util.HashMap;
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9
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10 import de.intevation.artifacts.Artifact;
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11 import de.intevation.artifacts.CallMeta;
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12 import de.intevation.artifacts.GlobalContext;
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13 import de.intevation.artifacts.ArtifactDatabase;
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14 import de.intevation.artifacts.ArtifactDatabaseException;
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15
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16 import de.intevation.artifacts.common.utils.XMLUtils;
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17 import de.intevation.artifacts.common.utils.StringUtils;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20
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21 import de.intevation.flys.artifacts.datacage.Recommendations;
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22
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23 import de.intevation.flys.artifacts.FLYSArtifact;
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24
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25
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26 /**
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27 * Following XPaths are evaluated on the incoming document.
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28 *
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29 * "/art:meta/art:artifact-id/@value" The UUID of the artifact. Optional.
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30 * Used to fill the template enviroment.
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31 * "/art:meta/art:user-id/@value" The UUID of the user. Optional.
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32 * If given the user specific template is filled.
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33 * "/art:meta/art:outs/@value" The list of outs used to recommend for the
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34 * various outputs.
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35 * "/art:meta/art:parameters/@value" A list of key/value pairs to inject more
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36 * filters to the templating.
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37 */
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38 public class MetaDataService
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39 extends FLYSService
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40 {
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41 private static Logger log = Logger.getLogger(MetaDataService.class);
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42
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43 public static final String XPATH_ARTIFACT_ID = "/art:meta/art:artifact-id/@value";
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44 public static final String XPATH_USER_ID = "/art:meta/art:user-id/@value";
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45 public static final String XPATH_OUTS = "/art:meta/art:outs/@value";
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46 public static final String XPATH_PARAMETERS = "/art:meta/art:parameters/@value";
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47
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48 /** The global context key of the artifact database. */
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49 public static final String ARTIFACT_DATA_BASE_KEY =
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50 "global.artifact.database";
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51
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52 public MetaDataService() {
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53 }
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54
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55 @Override
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56 protected Document doProcess(
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57 Document data,
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58 GlobalContext globalContext,
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59 CallMeta callMeta
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60 ) {
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61 log.debug("MetaDataService.process");
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62
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63 String artifactId = XMLUtils.xpathString(
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64 data, XPATH_ARTIFACT_ID, ArtifactNamespaceContext.INSTANCE);
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65
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66 if (artifactId != null
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67 && (artifactId = artifactId.trim()).length() == 0) {
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68 artifactId = null;
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69 }
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70
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71 String userId = XMLUtils.xpathString(
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72 data, XPATH_USER_ID, ArtifactNamespaceContext.INSTANCE);
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73
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74 if (userId != null
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75 && (userId = userId.trim()).length() == 0) {
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76 userId = null;
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77 }
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78
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79 String outs = XMLUtils.xpathString(
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80 data, XPATH_OUTS, ArtifactNamespaceContext.INSTANCE);
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81
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82 String parameters = XMLUtils.xpathString(
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83 data, XPATH_PARAMETERS, ArtifactNamespaceContext.INSTANCE);
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84
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85 return doService(
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86 artifactId, userId, outs, parameters, globalContext);
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87 }
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88
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89 protected static Map<String, Object> splitParameters(
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90 String parameters,
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91 Map<String, Object> data
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92 ) {
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93 if (parameters != null) {
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94 String [] parts = parameters.split("\\s*;\\s*");
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95 for (String part: parts) {
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96 String [] kv = part.split("\\s*:\\s*");
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97 if (kv.length < 2 || (kv[0] = kv[0].trim()).length() == 0) {
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98 continue;
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99 }
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100 String [] values = kv[1].split("\\s*,\\s*");
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101 data.put(kv[0], values.length == 1 ? values[0] : values);
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102 }
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103 }
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104 return data;
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105 }
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106
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107 /** Return the document containing matched stuff from meta-data.xml. */
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108 protected Document doService(
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109 String artifactId,
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110 String userId,
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111 String outsString,
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112 String parameters,
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113 GlobalContext globalContext
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114 ) {
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115 Document result = XMLUtils.newDocument();
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116
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117 FLYSArtifact flysArtifact;
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118
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119 if (log.isDebugEnabled()) {
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120 log.debug("artifact : " + artifactId);
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121 log.debug("user : " + userId);
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122 log.debug("outs : " + outsString);
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123 log.debug("parameters: " + parameters);
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124 }
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125
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126 if (userId != null && !StringUtils.checkUUID(userId)) {
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127 log.warn("'" + userId + "' is not a UUID");
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128 return result;
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129 }
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130
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131 if (artifactId != null) {
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132 if (!StringUtils.checkUUID(artifactId)) {
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133 log.warn("'" + artifactId + "' is not a UUID");
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134 return result;
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135 }
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136
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137 Object dbObject =
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138 (ArtifactDatabase)globalContext.get(ARTIFACT_DATA_BASE_KEY);
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139
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140 if (!(dbObject instanceof ArtifactDatabase)) {
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141 log.error("Cannot find artifact database");
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142 return result;
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143 }
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144
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145 ArtifactDatabase db = (ArtifactDatabase)dbObject;
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146
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147 Artifact artifact;
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148
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149 try {
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150 artifact = db.getRawArtifact(artifactId);
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151 }
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152 catch (ArtifactDatabaseException adbe) {
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153 log.warn("fetching artifact failed", adbe);
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154 return result;
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155 }
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156
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157 if (!(artifact instanceof FLYSArtifact)) {
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158 log.warn("artifact is not a FLYS artifact.");
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159 return result;
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160 }
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161
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162 flysArtifact = (FLYSArtifact)artifact;
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163 }
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164 else {
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165 flysArtifact = null;
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166 }
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167
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168
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169 Map<String, Object> data = splitParameters(
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170 parameters, new HashMap<String, Object>());
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171
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172 String [] outs = outsString == null
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173 ? new String [0]
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174 : outsString.split("\\s*,\\s*");
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175
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176 Recommendations rec = Recommendations.getInstance();
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177 rec.recommend(
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178 flysArtifact, userId, outs, data, result);
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179
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180 return result;
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181 }
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182 }
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183 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org