Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 1780:b503d92dd709

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Cosmetics, docs. flys-artifacts/trunk@3102 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 28 Oct 2011 09:22:34 +0000
parents f643ea084213
children 661dfad9910a
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.Map;
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6
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7 import org.apache.log4j.Logger;
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8
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9 import org.w3c.dom.Document;
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10 import org.w3c.dom.Element;
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11 import org.w3c.dom.Node;
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12
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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 import de.intevation.artifacts.ArtifactNamespaceContext;
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17 import de.intevation.artifactdatabase.state.Facet;
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18 import de.intevation.artifactdatabase.state.Output;
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19
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20 import de.intevation.artifacts.common.utils.XMLUtils;
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21 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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22
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23 import de.intevation.flys.artifacts.FLYSArtifact;
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24 import de.intevation.flys.artifacts.model.ManagedFacet;
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25
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26 /**
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27 * Create attribute- element of describe document of an ArtifactCollection.
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28 * The attribute-element contains the merged output of all outputmodes and
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29 * facets that are part of the collection.
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30 */
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31 public class AttributeWriter {
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32
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33 /** ArtifactDatabase used to fetch Artifacts. */
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34 protected ArtifactDatabase db = null;
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35
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36 protected Map<String, Output> oldAttr;
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38 protected Map<String, Output> newAttr;
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39
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40 private static Logger logger = Logger.getLogger(AttributeWriter.class);
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41
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42
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43 /**
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44 * Create a AttributeWriter.
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45 * Attributes not present in newAttr will not be included in the document.
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46 * @param db Database to fetch artifacts.
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47 * @param oldAttr "Old" (possibly user-changed) outputs.
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48 * @param newAttr "New" (eventually re-read in its original, unchanged
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49 * form) outputs.
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50 */
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51 public AttributeWriter(
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52 ArtifactDatabase db,
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53 Map<String, Output> oldAttr,
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54 Map<String, Output> newAttr)
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55 {
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56 this.db = db;
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57 this.oldAttr = oldAttr;
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58 this.newAttr = newAttr;
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59 }
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60
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61
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62 /**
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63 * Create document by merging outputs given in
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64 * constructor.
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65 *
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66 * The "new" set rules about existance of attributes, so anything not
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67 * present in it will not be included in the resulting document.
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68 * The "old" set rules about the content of attributes (as user changes
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69 * are recorded here and not in the new set).
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70 *
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71 * @return document with merged outputs as described.
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72 */
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73 protected Document write() {
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74 Document doc = XMLUtils.newDocument();
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75
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76 ElementCreator cr = new ElementCreator(
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77 doc,
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78 ArtifactNamespaceContext.NAMESPACE_URI,
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79 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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80
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81 Element attribute = cr.create("attribute");
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82 Element outs = cr.create("outputs");
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83
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84 attribute.appendChild(outs);
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85 doc.appendChild(attribute);
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86
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87 for (String outName: newAttr.keySet()) {
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88
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89 Output a = newAttr.get(outName);
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90 Output b = oldAttr.get(outName);
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91
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92 writeOutput(doc, outs, cr, a, b);
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93 }
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94
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95 return doc;
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96 }
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97
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98
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99 /**
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100 * @param doc Document to add output nodes to
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101 * @param outs Node in Document to add output nodes to
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102 * @param a the new output
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103 * @param b the old output
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104 */
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105 protected void writeOutput(
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106 Document doc,
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107 Node outs,
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108 ElementCreator cr,
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109 Output a, /* new output */
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110 Output b) /* old output */
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111 {
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112 Element output = cr.create("output");
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113 cr.addAttr(output, "name", a.getName());
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114
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115 outs.appendChild(output);
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116
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117 List<Facet> facetsA = a.getFacets();
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118 List<Facet> facetsB = null;
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119
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120 if (b != null) {
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121 facetsB = b.getFacets();
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122 }
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123
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124
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125 try {
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126 writeFacets(doc, cr, output, facetsA, facetsB);
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127 }
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128 catch (ArtifactDatabaseException ade) {
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129 logger.error(ade, ade);
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130 }
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131 }
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132
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133
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134 /**
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135 * @param doc Document to add facet nodes to
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136 * @param output Node in Document to add facet nodes to
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137 * @param a the new facets
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138 * @param b the old facets
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139 */
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140 protected void writeFacets(
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141 Document doc,
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142 ElementCreator cr,
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143 Element output,
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144 List<Facet> newFacets,
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145 List<Facet> oldFacets)
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146 throws ArtifactDatabaseException
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147 {
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148 int num = newFacets.size();
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149
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150 // Add all new Facets either in their old state or (if really
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151 // new) as they are.
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152 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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153 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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154 for (int i = 0; i < num; i++) {
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155 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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156
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157 ManagedFacet picked = pickFacet(facet, oldFacets);
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158 if (facet.equals(picked)) {
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159 genuinelyNewFacets.add(picked);
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160 }
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161 else {
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162 currentFacets.add(picked);
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163 }
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164 }
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165
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166 // With each genuinely new Facet, ask Artifact whether it comes to live
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167 // in/activate.
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168 for (ManagedFacet newMF: genuinelyNewFacets) {
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169 FLYSArtifact flys = (FLYSArtifact) db.getRawArtifact(newMF.getArtifact());
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170 newMF.setActive(flys.getInitialFacetActivity(
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171 newMF.getName(),
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172 newMF.getIndex()));
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173 }
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174
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175 // For each genuinely new Facet check positional conflicts.
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176 for (ManagedFacet newMF: genuinelyNewFacets) {
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177 boolean conflicts = true;
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178 // Loop until all conflicts resolved.
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179 while (conflicts) {
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180 conflicts = false;
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181 for (ManagedFacet oldMF: currentFacets) {
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182 if (newMF.getPosition() == oldMF.getPosition()) {
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183 conflicts = true;
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184 logger.debug("Positional conflict while merging " +
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185 "facets, pushing newest facet 1 up (" + newMF.getPosition() + ")");
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186 newMF.setPosition(newMF.getPosition() + 1);
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187 break;
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188 }
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189 }
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190 }
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191 currentFacets.add(newMF);
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192 }
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193
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194 // Now add all facets.
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195 for (ManagedFacet oldMF: currentFacets) {
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196 Node node = oldMF.toXML(doc);
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197 if (node != null) {
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198 output.appendChild(node);
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199 }
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200 }
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201 }
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202
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203
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204 /**
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205 * Returns the facet to be added to Document.
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206 * Return the new facet only if the "same" facet was not present before.
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207 * Return the "old" facet otherwise (user-defined information sticks
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208 * to it).
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209 * @param facet the new facet.
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210 * @param oldFacets the old facets, new facet is compared against each of
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211 * these.
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212 * @return facet if genuinely new, matching old facet otherwise.
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213 */
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214 protected ManagedFacet pickFacet(ManagedFacet facet,
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215 List<Facet> oldFacets)
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216 {
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217 if (oldFacets == null) {
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218 logger.debug("No old facets to compare a new to found.");
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219 return facet;
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220 }
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221
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222 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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223
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224 // Compare "new" facet with all old facets.
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225 // Take oldFacet if that facet was already present (otherwise
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226 // information is lost, the new one otherwise.
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227 for (Facet oFacet: oldFacets) {
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228 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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229 String oldHash = oldFacet.getName()
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230 + oldFacet.getIndex()
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231 + oldFacet.getArtifact();
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232 if (hash.equals(oldHash)) {
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233 return oldFacet;
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234 }
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235 }
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236 return facet;
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237 }
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238 }
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853dceead0f4 Only generate facets when needed.
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239 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org