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annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 1995:f114c0d55d19

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Little optimisation when writing CollectionAttributes flys-artifacts/trunk@3432 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 16 Dec 2011 10:08:39 +0000
parents 85132c9edd64
children c6432e8ea31e
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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0b466bd4ab24 Introduced a CollectionAttribute class that stores the information provided by the Collection's attribute document.
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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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50
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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 attribute.clearFacets(outName);
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97
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98 writeOutput(a.getName(), newFacets, oldFacets);
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99 }
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100
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101 return attribute;
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102 }
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103
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104
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105 /**
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106 * @param outputName the "new" outputs name
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107 * @param newOutFacets Facets of the new outputs
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108 * @param oldOutFacets Facets of the old outputs (can be null)
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109 */
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110 protected void writeOutput(
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111 String outputName,
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112 List<Facet> newOutFacets,
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113 List<Facet> oldOutFacets
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114 ) {
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115 List<String> compatFacets = this.compatibilities.get(outputName);
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116 try {
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117 writeFacets(outputName, newOutFacets, oldOutFacets, compatFacets);
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118 }
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119 catch (ArtifactDatabaseException ade) {
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120 logger.error(ade, ade);
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121 }
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122 }
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124
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125 /**
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126 * @param newFacets the new facets
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127 * @param oldFacets the old facets
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128 * @param compatibleFacets List of facets to accept
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129 * @return true if any facets are written to the out.
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130 */
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131 protected boolean writeFacets(
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132 String outputName,
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133 List<Facet> newFacets,
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134 List<Facet> oldFacets,
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135 List<String> compatibleFacets)
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136 throws ArtifactDatabaseException
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137 {
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138 if (compatibleFacets == null) {
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139 logger.warn("No compatible facets, not generating out.");
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140 return false;
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141 }
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142
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143 int num = newFacets.size();
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144
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145 // Add all new Facets either in their old state or (if really
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146 // new) as they are.
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147 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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148 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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149
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150 for (int i = 0; i < num; i++) {
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151 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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152 if (!compatibleFacets.contains(facet.getName())) {
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153 //logger.debug("Have incompatible facet, skip: " + facet.getName());
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154 continue;
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155 }
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156 //else logger.debug("Have compatible facet: " + facet.getName());
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157
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158 ManagedFacet picked = pickFacet(facet, oldFacets);
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159
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160 if (facet.equals(picked)) {
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161 genuinelyNewFacets.add(picked);
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162 }
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163 else {
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164 currentFacets.add(picked);
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165 }
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166 }
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167
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168 // With each genuinely new Facet, ask Artifact whether it comes to live
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169 // in/activate.
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170 for (ManagedFacet newMF: genuinelyNewFacets) {
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171 FLYSArtifact flys = (FLYSArtifact) db.getRawArtifact(newMF.getArtifact());
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172 newMF.setActive(flys.getInitialFacetActivity(
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173 outputName,
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174 newMF.getName(),
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175 newMF.getIndex()));
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176 }
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177
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178 // For each genuinely new Facet check positional conflicts.
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179 for (ManagedFacet newMF: genuinelyNewFacets) {
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180 boolean conflicts = true;
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181 // Loop until all conflicts resolved.
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182 while (conflicts) {
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183 conflicts = false;
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184 for (ManagedFacet oldMF: currentFacets) {
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185 if (newMF.getPosition() == oldMF.getPosition()) {
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186 conflicts = true;
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187 logger.debug("Positional conflict while merging " +
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188 "facets, pushing newest facet 1 up (" + newMF.getPosition() + ")");
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189 newMF.setPosition(newMF.getPosition() + 1);
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190 break;
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191 }
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192 }
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193 }
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194 currentFacets.add(newMF);
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195 }
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196
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197 // Fill/correct "gaps" (e.g. position 1,2,5 are taken, after gap filling
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198 // expect positions 1,2,3 [5->3])
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199 // Preparations to be able to detect gaps.
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200 Map<Integer, ManagedFacet> mfmap = new HashMap<Integer, ManagedFacet>();
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201 int max = 0;
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202 for (ManagedFacet mf: currentFacets) {
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203 int pos = mf.getPosition();
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204 mfmap.put(Integer.valueOf(pos), mf);
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205 if (pos > max) max = pos;
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206 }
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207
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208 // Finally do gap correction.
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209 if (max != currentFacets.size()) {
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210 int gap = 0;
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211 for (int i = 1; i <= max; i++) {
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212 ManagedFacet mf = mfmap.get(Integer.valueOf(i));
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213 if (mf == null) {
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214 gap++;
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215 continue;
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216 }
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217 mf.setPosition(mf.getPosition() - gap);
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218 }
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219 }
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220
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221 // Now add all facets.
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222 for (ManagedFacet oldMF: currentFacets) {
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223 attribute.addFacet(outputName, oldMF);
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224 }
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225
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226 return currentFacets.size() > 0;
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227 }
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228
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229
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230 /**
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231 * Returns the facet to be added to Document.
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232 * Return the new facet only if the "same" facet was not present before.
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233 * Return the "old" facet otherwise (user-defined information sticks
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234 * to it).
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235 * @param facet the new facet.
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236 * @param oldFacets the old facets, new facet is compared against each of
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237 * these.
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238 * @return facet if genuinely new, matching old facet otherwise.
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239 */
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0b466bd4ab24 Introduced a CollectionAttribute class that stores the information provided by the Collection's attribute document.
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240 protected ManagedFacet pickFacet(ManagedFacet facet, List<Facet> oldFacets)
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241 {
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242 if (oldFacets == null) {
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243 logger.debug("No old facets to compare a new to found.");
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244 return facet;
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245 }
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246
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247 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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248
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249 // Compare "new" facet with all old facets.
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250 // Take oldFacet if that facet was already present (otherwise
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251 // information is lost, the new one otherwise.
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252 for (Facet oFacet: oldFacets) {
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
253 ManagedFacet oldFacet = (ManagedFacet) oFacet;
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
254 String oldHash = oldFacet.getName()
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
255 + oldFacet.getIndex()
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
256 + oldFacet.getArtifact();
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
257 if (hash.equals(oldHash)) {
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
258 return oldFacet;
346
16161de47662 The Attributes of a collection are written into its DESCRIBE now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
259 }
16161de47662 The Attributes of a collection are written into its DESCRIBE now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
260 }
1635
1b5204203e18 Minor refactoring, documentation.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1634
diff changeset
261 return facet;
346
16161de47662 The Attributes of a collection are written into its DESCRIBE now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
262 }
16161de47662 The Attributes of a collection are written into its DESCRIBE now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
263 }
705
853dceead0f4 Only generate facets when needed.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 694
diff changeset
264 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org