Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 1639:12235a2ace21

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Add positional-conflict-awareness when merging Facets in attribute of a collection. Apply "first come first serve"-rule. flys-artifacts/trunk@2824 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Mon, 26 Sep 2011 13:17:55 +0000
parents 1b5204203e18
children f643ea084213
rev   line source
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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.ArtifactNamespaceContext;
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14
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15 import de.intevation.artifactdatabase.state.Facet;
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16 import de.intevation.artifactdatabase.state.Output;
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17
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18 import de.intevation.artifacts.common.utils.XMLUtils;
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19 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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21 import de.intevation.flys.artifacts.model.ManagedFacet;
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23 /**
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24 * Create attribute- element of describe document of an ArtifactCollection.
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25 * The attribute-element contains the merged output of all outputmodes and
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26 * facets that are part of the collection.
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27 */
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28 public class AttributeWriter {
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29
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30 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 private static Logger logger = Logger.getLogger(AttributeWriter.class);
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36 /**
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37 * Create a AttributeWriter.
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38 * Attributes not present in newAttr will not be included in the document.
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39 * @param oldAttr "Old" (possibly user-changed) outputs.
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40 * @param newAttr "New" (eventually re-read in its original, unchagnged
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41 * form) outputs.
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42 */
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43 public AttributeWriter(
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44 Map<String, Output> oldAttr,
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45 Map<String, Output> newAttr)
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46 {
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47 this.oldAttr = oldAttr;
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48 this.newAttr = newAttr;
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49 }
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51
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52 /**
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53 * Create document by merging outputs given in
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54 * constructor.
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55 * The "new" set rules about existance of attributes, so anything not
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56 * present in it will not be included in the resulting document.
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57 * The "old" set rules about the content of attributes (as user changes
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58 * are recorded here and not in the new set).
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59 * @return document with merged outputs as described.
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60 */
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61 protected Document write() {
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62 Document doc = XMLUtils.newDocument();
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63
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64 ElementCreator cr = new ElementCreator(
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65 doc,
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66 ArtifactNamespaceContext.NAMESPACE_URI,
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67 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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68
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69 Element attribute = cr.create("attribute");
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70 Element outs = cr.create("outputs");
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71
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72 attribute.appendChild(outs);
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73 doc.appendChild(attribute);
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74
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75 for (String outName: newAttr.keySet()) {
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76
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77 Output a = newAttr.get(outName);
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78 Output b = oldAttr.get(outName);
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79
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80 writeOutput(doc, outs, cr, a, b);
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81 }
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82
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83 return doc;
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84 }
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87 /**
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88 * @param doc Document to add output nodes to
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89 * @param outs Node in Document to add output nodes to
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90 * @param a the new output
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91 * @param b the old output
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92 */
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93 protected void writeOutput(
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94 Document doc,
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95 Node outs,
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96 ElementCreator cr,
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97 Output a, /* new output */
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98 Output b) /* old output */
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99 {
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100 Element output = cr.create("output");
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101 cr.addAttr(output, "name", a.getName());
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102
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103 outs.appendChild(output);
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104
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105 List<Facet> facetsA = a.getFacets();
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106 List<Facet> facetsB = null;
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107
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108 if (b != null) {
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109 facetsB = b.getFacets();
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110 }
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111
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112 writeFacets(doc, cr, output, facetsA, facetsB);
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113 }
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114
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115
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116 /**
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117 * @param doc Document to add facet nodes to
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118 * @param output Node in Document to add facet nodes to
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119 * @param a the new facets
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120 * @param b the old facets
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121 */
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122 protected void writeFacets(
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123 Document doc,
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124 ElementCreator cr,
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125 Element output,
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126 List<Facet> newFacets,
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127 List<Facet> oldFacets)
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128 {
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129 int num = newFacets.size();
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130
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131 // Add all new Facets either in their old state or (if really
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132 // new) as they are.
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133 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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134 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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135 for (int i = 0; i < num; i++) {
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136 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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137
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138 ManagedFacet picked = pickFacet(facet, oldFacets);
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139 if (facet.equals(picked)) {
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140 genuinelyNewFacets.add(picked);
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141 }
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142 else {
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143 currentFacets.add(picked);
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144 }
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145 }
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146
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147 // For each genuinely new Facet check positional conflicts.
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148 for (ManagedFacet newMF: genuinelyNewFacets) {
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149 boolean conflicts = true;
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150 // Loop until all conflicts resolved.
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151 while (conflicts) {
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152 conflicts = false;
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153 for (ManagedFacet oldMF: currentFacets) {
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154 if (newMF.getPosition() == oldMF.getPosition()) {
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155 conflicts = true;
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156 logger.debug("Positional conflict while merging " +
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157 "facets, pushing newest facet 1 up ("+newMF.getPosition()+")");
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158 newMF.setPosition(newMF.getPosition() + 1);
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159 break;
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160 }
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161 }
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162 }
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163 currentFacets.add(newMF);
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164 }
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165
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166 // Now add all facets.
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167 for (ManagedFacet oldMF: currentFacets) {
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168 Node node = oldMF.toXML(doc);
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169 if (node != null) {
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170 output.appendChild(node);
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171 }
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172 }
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173 }
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174
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175
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176 /**
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177 * Returns the facet to be added to Document.
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178 * Return the new facet only if the "same" facet was not present before.
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179 * Return the "old" facet otherwise (user-defined information sticks
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180 * to it).
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181 * @param facet the new facet.
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182 * @param oldFacets the old facets, new facet is compared against each of
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183 * these.
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184 * @return facet if genuinely new, matching old facet otherwise.
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185 */
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186 protected ManagedFacet pickFacet(ManagedFacet facet,
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187 List<Facet> oldFacets) {
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188 if (oldFacets == null) {
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189 logger.debug("No old facets to compare a new to found.");
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190 return facet;
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191 }
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192
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193 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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194
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195 // Compare "new" facet with all old facets.
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196 // Take oldFacet if that facet was already present (otherwise
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197 // information is lost, the new one otherwise.
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198 for (Facet oFacet: oldFacets) {
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199 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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200 String oldHash = oldFacet.getName()
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201 + oldFacet.getIndex()
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202 + oldFacet.getArtifact();
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203 if (hash.equals(oldHash)) {
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204 return oldFacet;
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205 }
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206 }
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207 return facet;
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208 }
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209 }
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210 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org