Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 3093:b0f59d42ae4f

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De-centralized database configuration. flys-artifacts/trunk@4692 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 18 Jun 2012 14:30:43 +0000
parents 22732713c54d
children afc7bfb4800b
rev   line source
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16161de47662 The Attributes of a collection are written into its DESCRIBE now.
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1 package de.intevation.flys.collections;
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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 import java.util.HashMap;
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6 import java.util.Map;
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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 de.intevation.artifacts.ArtifactDatabase;
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11 import de.intevation.artifacts.ArtifactDatabaseException;
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13 import de.intevation.artifactdatabase.state.Facet;
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14 import de.intevation.artifactdatabase.state.Output;
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16 import de.intevation.flys.artifacts.FLYSArtifact;
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17 import de.intevation.flys.artifacts.model.ManagedFacet;
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18
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19 /**
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20 * Create attribute- element of describe document of an ArtifactCollection.
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21 * The attribute-element contains the merged output of all outputmodes and
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22 * facets that are part of the collection.
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23 */
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24 public class AttributeWriter {
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25
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26 /** ArtifactDatabase used to fetch Artifacts. */
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27 protected ArtifactDatabase db = null;
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29 protected Map<String, Output> oldAttr;
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31 protected Map<String, Output> newAttr;
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32
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33 /** List of already seen facets. */
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34 protected List<Facet> oldFacets;
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35
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36 /** List of "new" facets. */
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37 protected List<Facet> newFacets;
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38
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39 /**
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40 * "Compatibility matrix", mapws list of facet names to output names.
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41 * Any facet that is not found in the list for a specific output will
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42 * not be added to the resulting document.
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43 */
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44 protected Map<String, List<String>> compatibilities;
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45
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46
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47 /** The result of the <i>write()</i> operation.*/
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48 protected CollectionAttribute attribute;
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51 private static Logger logger = Logger.getLogger(AttributeWriter.class);
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52
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53
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54 /**
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55 * Create a AttributeWriter.
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56 * Attributes not present in newAttr will not be included in the document.
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57 * @param db Database to fetch artifacts.
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58 * @param oldAttr "Old" (possibly user-changed) outputs.
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59 * @param newAttr "New" (eventually re-read in its original, unchanged
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60 * form) outputs.
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61 */
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62 public AttributeWriter(
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63 ArtifactDatabase db,
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64 CollectionAttribute attribute,
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65 Map<String, Output> oldAttr,
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66 List<Facet> oldFacets,
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67 Map<String, Output> newAttr,
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68 List<Facet> newFacets,
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69 Map<String, List<String>> matrix)
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70 {
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71 this.db = db;
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72 this.attribute = attribute;
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73 this.oldAttr = oldAttr;
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74 this.newAttr = newAttr;
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75 this.oldFacets = oldFacets;
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76 this.newFacets = newFacets;
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77 this.compatibilities = matrix;
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78 }
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79
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80
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81 /**
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82 * Create document by merging outputs given in
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83 * constructor.
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84 *
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85 * The "new" set rules about existance of attributes, so anything not
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86 * present in it will not be included in the resulting document.
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87 * The "old" set rules about the content of attributes (as user changes
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88 * are recorded here and not in the new set).
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89 *
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90 * @return document with merged outputs as described.
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91 */
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92 protected CollectionAttribute write() {
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93 for (Map.Entry<String, Output> entry: newAttr.entrySet()) {
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94 String outName = entry.getKey();
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95 Output a = entry.getValue();
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96
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97
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98 Output exists = attribute.getOutput(outName);
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99 if (exists == null) {
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100 attribute.addOutput(outName, a);
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101 }
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102
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103 attribute.clearFacets(outName);
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104
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105 if (logger.isDebugEnabled()) {
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106 logger.debug("Merge Output: " + outName);
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107 logger.debug(" old Facets: " + oldFacets.size());
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108 logger.debug(" new Facets: " + newFacets.size());
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109 }
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110
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111 writeOutput(a.getName(), newFacets, oldFacets);
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112 }
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113
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114 // THIS CALL IS ABSOLUTELY NECESSARY!
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115 attribute.cleanEmptyOutputs();
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116
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117 return attribute;
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118 }
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119
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120
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121 /**
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122 * @param outputName the "new" outputs name
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123 * @param newOutFacets Facets of the new outputs
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124 * @param oldOutFacets Facets of the old outputs (can be null)
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125 */
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126 protected void writeOutput(
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127 String outputName,
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128 List<Facet> newOutFacets,
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129 List<Facet> oldOutFacets
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130 ) {
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131 List<String> compatFacets = this.compatibilities.get(outputName);
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132
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133 if (logger.isDebugEnabled() && compatFacets != null) {
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134 logger.debug("Compabitle Facets:");
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135 for (String compatible: compatFacets) {
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136 logger.debug( "- " + compatible);
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137 }
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138 }
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139
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140 try {
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141 writeFacets(outputName, newOutFacets, oldOutFacets, compatFacets);
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142 }
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143 catch (ArtifactDatabaseException ade) {
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144 logger.error(ade, ade);
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145 }
346
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146 }
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147
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148
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149 /**
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150 * @param newFacets the new facets
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151 * @param oldFacets the old facets
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152 * @param compatibleFacets List of facets to accept
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153 * @return true if any facets are written to the out.
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154 */
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155 protected boolean writeFacets(
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156 String outputName,
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157 List<Facet> newFacets,
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158 List<Facet> oldFacets,
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159 List<String> compatibleFacets)
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160 throws ArtifactDatabaseException
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161 {
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162 if (compatibleFacets == null) {
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163 logger.warn("No compatible facets, not generating out.");
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164 return false;
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165 }
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166
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167 int num = newFacets.size();
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168
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169 // Add all new Facets either in their old state or (if really
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170 // new) as they are.
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171 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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172 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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173
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174 for (int i = 0; i < num; i++) {
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175 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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176
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177 logger.debug("Try to add Facet: " + facet.getName());
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178
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179 if (!compatibleFacets.contains(facet.getName())) {
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180 //logger.debug("Have incompatible facet, skip: " + facet.getName());
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181 continue;
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182 }
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183 //else logger.debug("Have compatible facet: " + facet.getName());
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184
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185 ManagedFacet picked = pickFacet(facet, oldFacets);
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186
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187 if (facet.equals(picked)) {
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188 genuinelyNewFacets.add(picked);
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189 }
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190 else {
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191 currentFacets.add(picked);
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192 }
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193 }
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194
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195 // With each genuinely new Facet, ask Artifact whether it comes to live
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196 // in/activate.
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197 for (ManagedFacet newMF: genuinelyNewFacets) {
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198 FLYSArtifact flys = (FLYSArtifact) db.getRawArtifact(newMF.getArtifact());
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199 newMF.setActive(flys.getInitialFacetActivity(
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200 outputName,
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201 newMF.getName(),
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202 newMF.getIndex()));
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203 }
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204
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205 // For each genuinely new Facet check positional conflicts.
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206 for (ManagedFacet newMF: genuinelyNewFacets) {
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207 boolean conflicts = true;
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208 // Loop until all conflicts resolved.
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209 while (conflicts) {
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210 conflicts = false;
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211 for (ManagedFacet oldMF: currentFacets) {
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212 if (newMF.getPosition() == oldMF.getPosition()) {
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213 conflicts = true;
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214 logger.debug("Positional conflict while merging " +
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215 "facets, pushing newest facet 1 up (" + newMF.getPosition() + ")");
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216 newMF.setPosition(newMF.getPosition() + 1);
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217 break;
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218 }
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219 }
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220 }
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221 currentFacets.add(newMF);
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222 }
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223
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224 // Fill/correct "gaps" (e.g. position 1,2,5 are taken, after gap filling
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225 // expect positions 1,2,3 [5->3])
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226 // Preparations to be able to detect gaps.
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227 Map<Integer, ManagedFacet> mfmap = new HashMap<Integer, ManagedFacet>();
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228 int max = 0;
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229 for (ManagedFacet mf: currentFacets) {
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230 int pos = mf.getPosition();
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231 mfmap.put(Integer.valueOf(pos), mf);
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232 if (pos > max) max = pos;
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233 }
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diff changeset
234
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235 // Finally do gap correction.
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diff changeset
236 if (max != currentFacets.size()) {
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diff changeset
237 int gap = 0;
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diff changeset
238 for (int i = 1; i <= max; i++) {
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diff changeset
239 ManagedFacet mf = mfmap.get(Integer.valueOf(i));
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diff changeset
240 if (mf == null) {
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diff changeset
241 gap++;
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diff changeset
242 continue;
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diff changeset
243 }
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244 mf.setPosition(mf.getPosition() - gap);
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245 }
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246 }
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247
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248 // Now add all facets.
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249 for (ManagedFacet oldMF: currentFacets) {
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diff changeset
250 attribute.addFacet(outputName, oldMF);
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diff changeset
251 }
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252
490ab097f58c Prevent empty output-nodes in flyscollections attributes.
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253 return currentFacets.size() > 0;
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254 }
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255
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256
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257 /**
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258 * Returns the facet to be added to Document.
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259 * Return the new facet only if the "same" facet was not present before.
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260 * Return the "old" facet otherwise (user-defined information sticks
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261 * to it).
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262 * @param facet the new facet.
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263 * @param oldFacets the old facets, new facet is compared against each of
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264 * these.
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265 * @return facet if genuinely new, matching old facet otherwise.
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266 */
1976
0b466bd4ab24 Introduced a CollectionAttribute class that stores the information provided by the Collection's attribute document.
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267 protected ManagedFacet pickFacet(ManagedFacet facet, List<Facet> oldFacets)
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268 {
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269 if (oldFacets == null) {
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270 logger.debug("No old facets to compare a new to found.");
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271 return facet;
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272 }
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273
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274 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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275
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276 // Compare "new" facet with all old facets.
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277 // Take oldFacet if that facet was already present (otherwise
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278 // information is lost, the new one otherwise.
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279 for (Facet oFacet: oldFacets) {
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280 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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281 String oldHash = oldFacet.getName()
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282 + oldFacet.getIndex()
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283 + oldFacet.getArtifact();
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284 if (hash.equals(oldHash)) {
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285 return oldFacet;
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286 }
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287 }
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288 return facet;
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289 }
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290 }
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853dceead0f4 Only generate facets when needed.
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291 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org