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annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 4376:3c8964855270

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Avoid NullPointerExceptions if no settings are available Don't fail with a NullPointerExceptions if no setting for the axis is available.
author Björn Ricks <bjoern.ricks@intevation.de>
date Fri, 02 Nov 2012 15:41:52 +0100
parents 721d55bdab9e
children e8a4d2fd25cc
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.FacetActivity;
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15 import de.intevation.artifactdatabase.state.Output;
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17 import de.intevation.flys.artifacts.FLYSArtifact;
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18 import de.intevation.flys.artifacts.model.ManagedFacet;
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19
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20 /**
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21 * Create attribute- element of describe document of an ArtifactCollection.
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22 * The attribute-element contains the merged output of all outputmodes and
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23 * facets that are part of the collection.
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24 */
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25 public class AttributeWriter {
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26
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27 /** ArtifactDatabase used to fetch Artifacts. */
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28 protected ArtifactDatabase db = null;
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29
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30 protected Map<String, Output> oldAttr;
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32 protected Map<String, Output> newAttr;
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33
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34 /** List of already seen facets. */
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35 protected List<Facet> oldFacets;
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36
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37 /** List of "new" facets. */
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38 protected List<Facet> newFacets;
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39
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40 /**
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41 * "Compatibility matrix", mapws list of facet names to output names.
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42 * Any facet that is not found in the list for a specific output will
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43 * not be added to the resulting document.
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44 */
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45 protected Map<String, List<String>> compatibilities;
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46
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47
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48 /** The result of the <i>write()</i> operation.*/
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49 protected CollectionAttribute attribute;
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51
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52 private static Logger logger = Logger.getLogger(AttributeWriter.class);
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53
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54
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55 /**
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56 * Create a AttributeWriter.
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57 * Attributes not present in newAttr will not be included in the document.
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58 * @param db Database to fetch artifacts.
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59 * @param oldAttr "Old" (possibly user-changed) outputs.
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60 * @param newAttr "New" (eventually re-read in its original, unchanged
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61 * form) outputs.
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62 */
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63 public AttributeWriter(
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64 ArtifactDatabase db,
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65 CollectionAttribute attribute,
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66 Map<String, Output> oldAttr,
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67 List<Facet> oldFacets,
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68 Map<String, Output> newAttr,
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69 List<Facet> newFacets,
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70 Map<String, List<String>> matrix)
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71 {
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72 this.db = db;
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73 this.attribute = attribute;
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74 this.oldAttr = oldAttr;
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75 this.newAttr = newAttr;
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76 this.oldFacets = oldFacets;
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77 this.newFacets = newFacets;
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78 this.compatibilities = matrix;
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79 }
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81
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82 /**
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83 * Create document by merging outputs given in
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84 * constructor.
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85 *
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86 * The "new" set rules about existance of attributes, so anything not
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87 * present in it will not be included in the resulting document.
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88 * The "old" set rules about the content of attributes (as user changes
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89 * are recorded here and not in the new set).
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90 *
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91 * @return document with merged outputs as described.
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92 */
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93 protected CollectionAttribute write() {
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95 boolean debug = logger.isDebugEnabled();
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96
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97 for (Map.Entry<String, Output> entry: newAttr.entrySet()) {
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98 String outName = entry.getKey();
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99 Output a = entry.getValue();
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101 Output exists = attribute.getOutput(outName);
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102 if (exists == null) {
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103 attribute.addOutput(outName, a);
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104 }
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105
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106 attribute.clearFacets(outName);
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107
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108 if (debug) {
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109 logger.debug("Merge Output: " + outName);
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110 logger.debug(" old Facets: " + oldFacets.size());
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111 logger.debug(" new Facets: " + newFacets.size());
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112 }
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113
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114 writeOutput(a.getName(), newFacets, oldFacets);
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115 }
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116
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117 // THIS CALL IS ABSOLUTELY NECESSARY!
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118 attribute.cleanEmptyOutputs();
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119
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120 return attribute;
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121 }
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122
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123
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124 /**
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125 * @param outputName the "new" outputs name
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126 * @param newOutFacets Facets of the new outputs
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127 * @param oldOutFacets Facets of the old outputs (can be null)
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128 */
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129 protected void writeOutput(
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130 String outputName,
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131 List<Facet> newOutFacets,
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132 List<Facet> oldOutFacets
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133 ) {
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134 List<String> compatFacets = this.compatibilities.get(outputName);
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135
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136 if (logger.isDebugEnabled() && compatFacets != null) {
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137 logger.debug("Compabitle Facets:");
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138 for (String compatible: compatFacets) {
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139 logger.debug( "- " + compatible);
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140 }
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141 }
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142
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143 try {
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144 writeFacets(outputName, newOutFacets, oldOutFacets, compatFacets);
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145 }
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146 catch (ArtifactDatabaseException ade) {
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147 logger.error(ade, ade);
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148 }
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149 }
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150
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151
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152 /**
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153 * @param newFacets the new facets
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154 * @param oldFacets the old facets
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155 * @param compatibleFacets List of facets to accept
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156 * @return true if any facets are written to the out.
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157 */
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158 protected boolean writeFacets(
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159 String outputName,
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160 List<Facet> newFacets,
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161 List<Facet> oldFacets,
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162 List<String> compatibleFacets)
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163 throws ArtifactDatabaseException
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164 {
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165 if (compatibleFacets == null) {
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166 logger.warn("No compatible facets, not generating out.");
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167 return false;
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168 }
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169
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170 int num = newFacets.size();
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171
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172 // Add all new Facets either in their old state or (if really
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173 // new) as they are.
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174 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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175 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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176
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177 boolean debug = logger.isDebugEnabled();
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178
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179 for (int i = 0; i < num; i++) {
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180 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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181
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182 if (debug) {
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183 logger.debug("Try to add Facet: " + facet.getName());
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184 }
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185
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186 if (!compatibleFacets.contains(facet.getName())) {
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187 logger.warn("Have incompatible facet, skip: " + facet.getName());
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188 continue;
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189 }
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190 else {
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191 logger.debug("Have compatible facet: " + facet.getName());
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192 }
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193
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194 ManagedFacet picked = pickFacet(facet, oldFacets);
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195
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196 if (facet.equals(picked)) {
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197 genuinelyNewFacets.add(picked);
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198 }
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199 else {
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200 currentFacets.add(picked);
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201 }
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202 }
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203
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204 FacetActivity.Registry registry = FacetActivity.Registry.getInstance();
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205
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206 // With each genuinely new Facet, figure out whether it comes to live
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207 // in/activate.
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208 for (ManagedFacet newMF: genuinelyNewFacets) {
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209 FLYSArtifact flys =
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210 (FLYSArtifact)db.getRawArtifact(newMF.getArtifact());
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211
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212 boolean isActive = registry.isInitialActive(
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213 flys.getName(), flys, newMF, outputName);
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214
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215 newMF.setActive(isActive ? 1 : 0);
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216 }
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217
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218 // For each genuinely new Facet check positional conflicts.
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219 for (ManagedFacet newMF: genuinelyNewFacets) {
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220 boolean conflicts = true;
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221 // Loop until all conflicts resolved.
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222 while (conflicts) {
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223 conflicts = false;
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224 for (ManagedFacet oldMF: currentFacets) {
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225 if (newMF.getPosition() == oldMF.getPosition()) {
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226 conflicts = true;
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227 if (debug) {
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228 logger.debug(
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229 "Positional conflict while merging " +
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230 "facets, pushing newest facet 1 up (" +
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diff changeset
231 newMF.getPosition() + ")");
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232 }
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233 newMF.setPosition(newMF.getPosition() + 1);
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234 break;
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235 }
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236 }
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237 }
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238 currentFacets.add(newMF);
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239 }
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240
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241 // Fill/correct "gaps" (e.g. position 1,2,5 are taken, after gap filling
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242 // expect positions 1,2,3 [5->3])
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243 // Preparations to be able to detect gaps.
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244 Map<Integer, ManagedFacet> mfmap =
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245 new HashMap<Integer, ManagedFacet>();
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246 int max = 0;
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247 for (ManagedFacet mf: currentFacets) {
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248 int pos = mf.getPosition();
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249 mfmap.put(Integer.valueOf(pos), mf);
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250 if (pos > max) max = pos;
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251 }
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252
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253 // Finally do gap correction.
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254 if (max != currentFacets.size()) {
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255 int gap = 0;
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256 for (int i = 1; i <= max; i++) {
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257 ManagedFacet mf = mfmap.get(Integer.valueOf(i));
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258 if (mf == null) {
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259 gap++;
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260 continue;
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261 }
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262 mf.setPosition(mf.getPosition() - gap);
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263 }
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264 }
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265
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266 // Now add all facets.
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267 for (ManagedFacet oldMF: currentFacets) {
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0b466bd4ab24 Introduced a CollectionAttribute class that stores the information provided by the Collection's attribute document.
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268 attribute.addFacet(outputName, oldMF);
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269 }
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270
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271 return !currentFacets.isEmpty();
346
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272 }
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273
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274
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275 /**
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276 * Returns the facet to be added to Document.
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277 * Return the new facet only if the "same" facet was not present before.
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278 * Return the "old" facet otherwise (user-defined information sticks
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279 * to it).
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280 * @param facet the new facet.
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281 * @param oldFacets the old facets, new facet is compared against each of
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282 * these.
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283 * @return facet if genuinely new, matching old facet otherwise.
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284 */
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285 protected ManagedFacet pickFacet(ManagedFacet facet, List<Facet> oldFacets)
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f643ea084213 Allow simple codepaths to have Facets initially being 'inactive' (wrt rendering).
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286 {
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287 if (oldFacets == null) {
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288 logger.debug("No old facets to compare a new to found.");
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289 return facet;
346
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290 }
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291
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292 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
346
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293
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294 // Compare "new" facet with all old facets.
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295 // Take oldFacet if that facet was already present (otherwise
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296 // information is lost, the new one otherwise.
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297 for (Facet oFacet: oldFacets) {
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298 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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299 String oldHash = oldFacet.getName()
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300 + oldFacet.getIndex()
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301 + oldFacet.getArtifact();
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302 if (hash.equals(oldHash)) {
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303 return oldFacet;
346
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304 }
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305 }
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306 return facet;
346
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307 }
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308 }
705
853dceead0f4 Only generate facets when needed.
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309 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org