Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 1810:193a916d1ab5

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Pass output name to artifacts getInitialFacetActivity, prevent gaps in collection attributes outputs facets positions. flys-artifacts/trunk@3139 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 02 Nov 2011 11:27:04 +0000
parents d5d2bffb26ca
children 490ab097f58c
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 org.w3c.dom.Document;
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11 import org.w3c.dom.Element;
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12 import org.w3c.dom.Node;
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13
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14 import de.intevation.artifacts.ArtifactDatabase;
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15 import de.intevation.artifacts.ArtifactDatabaseException;
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16 import de.intevation.artifacts.ArtifactNamespaceContext;
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17
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18 import de.intevation.artifactdatabase.state.Facet;
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19 import de.intevation.artifactdatabase.state.Output;
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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23
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24 import de.intevation.flys.artifacts.FLYSArtifact;
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25 import de.intevation.flys.artifacts.model.ManagedFacet;
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26
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27 /**
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28 * Create attribute- element of describe document of an ArtifactCollection.
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29 * The attribute-element contains the merged output of all outputmodes and
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30 * facets that are part of the collection.
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31 */
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32 public class AttributeWriter {
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33
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34 /** ArtifactDatabase used to fetch Artifacts. */
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35 protected ArtifactDatabase db = null;
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36
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37 protected Map<String, Output> oldAttr;
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39 protected Map<String, Output> newAttr;
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40
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41 /** List of already seen facets. */
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42 protected List<Facet> oldFacets;
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43
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44 /** List of "new" facets. */
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45 protected List<Facet> newFacets;
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46
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47 /**
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48 * "Compatibility matrix", mapws list of facet names to output names.
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49 * Any facet that is not found in the list for a specific output will
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50 * not be added to the resulting document.
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51 */
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52 protected Map<String, List<String>> compatibilities;
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53
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54 private static Logger logger = Logger.getLogger(AttributeWriter.class);
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55
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56
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57 /**
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58 * Create a AttributeWriter.
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59 * Attributes not present in newAttr will not be included in the document.
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60 * @param db Database to fetch artifacts.
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61 * @param oldAttr "Old" (possibly user-changed) outputs.
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62 * @param newAttr "New" (eventually re-read in its original, unchanged
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63 * form) outputs.
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64 */
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65 public AttributeWriter(
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66 ArtifactDatabase db,
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67 Map<String, Output> oldAttr,
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68 List<Facet> oldFacets,
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69 Map<String, Output> newAttr,
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70 List<Facet> newFacets,
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71 Map<String, List<String>> matrix)
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72 {
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73 this.db = db;
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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 Document write() {
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94 Document doc = XMLUtils.newDocument();
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95
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96 ElementCreator cr = new ElementCreator(
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97 doc,
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98 ArtifactNamespaceContext.NAMESPACE_URI,
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99 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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100
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101 Element attribute = cr.create("attribute");
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102 Element outs = cr.create("outputs");
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103
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104 attribute.appendChild(outs);
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105 doc.appendChild(attribute);
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106
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107 for (String outName: newAttr.keySet()) {
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108 Output a = newAttr.get(outName);
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109 Output b = oldAttr.get(outName);
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110
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111 writeOutput(doc, outs, cr, a.getName(), newFacets, oldFacets);
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112 }
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113
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114 return doc;
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115 }
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116
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117
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118 /**
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119 * @param doc Document to add output nodes to
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120 * @param outs Node in Document to add output nodes to
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121 * @param cr ElementCreator in use to modify doc/outs
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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 Document doc,
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128 Node outs,
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129 ElementCreator cr,
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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 Element output = cr.create("output");
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135 cr.addAttr(output, "name", outputName);
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136
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8378683fa07a Bugfix: The outputs of a Collection's attribute document are stored in an outputs node now instead of being stored toplevel in the document.
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137 outs.appendChild(output);
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138
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139 List<String> compatibleFacets = this.compatibilities.get(outputName);
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140 try {
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141 writeFacets(doc, cr, output, newOutFacets, oldOutFacets, compatibleFacets);
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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 }
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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 doc Document to add facet nodes to
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151 * @param cr ElementCreator to use with output/doc
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152 * @param output Node in Document to add facet nodes to
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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 */
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157 protected void writeFacets(
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158 Document doc,
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159 ElementCreator cr,
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160 Element output,
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161 List<Facet> newFacets,
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162 List<Facet> oldFacets,
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163 List<String> compatibleFacets)
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164 throws ArtifactDatabaseException
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165 {
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166 if (compatibleFacets == null) {
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167 logger.warn("No compatible facets, not generating out.");
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168 return;
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169 }
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170
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171 int num = newFacets.size();
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172
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173 // Add all new Facets either in their old state or (if really
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174 // new) as they are.
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175 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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176 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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177
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178 for (int i = 0; i < num; i++) {
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179 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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180 if (!compatibleFacets.contains(facet.getName())) {
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181 //logger.debug("Have incompatible facet, skip: " + facet.getName());
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182 continue;
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183 }
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184 //else logger.debug("Have compatible facet: " + facet.getName());
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185
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186 ManagedFacet picked = pickFacet(facet, oldFacets);
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187
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188 if (facet.equals(picked)) {
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189 genuinelyNewFacets.add(picked);
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190 }
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191 else {
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192 currentFacets.add(picked);
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193 }
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194 }
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195
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196 // With each genuinely new Facet, ask Artifact whether it comes to live
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197 // in/activate.
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198 for (ManagedFacet newMF: genuinelyNewFacets) {
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199 FLYSArtifact flys = (FLYSArtifact) db.getRawArtifact(newMF.getArtifact());
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200 newMF.setActive(flys.getInitialFacetActivity(
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201 output.getAttribute("name"),
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202 newMF.getName(),
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203 newMF.getIndex()));
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204 }
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205
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206 // For each genuinely new Facet check positional conflicts.
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207 for (ManagedFacet newMF: genuinelyNewFacets) {
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208 boolean conflicts = true;
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209 // Loop until all conflicts resolved.
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210 while (conflicts) {
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211 conflicts = false;
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212 for (ManagedFacet oldMF: currentFacets) {
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213 if (newMF.getPosition() == oldMF.getPosition()) {
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214 conflicts = true;
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215 logger.debug("Positional conflict while merging " +
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216 "facets, pushing newest facet 1 up (" + newMF.getPosition() + ")");
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217 newMF.setPosition(newMF.getPosition() + 1);
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218 break;
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219 }
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220 }
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221 }
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222 currentFacets.add(newMF);
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223 }
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224
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225 // Fill/correct "gaps" (e.g. position 1,2,5 are taken, after gap filling
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226 // expect positions 1,2,3 [5->3])
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227 // Preparations to be able to detect gaps.
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228 Map<Integer, ManagedFacet> mfmap = new HashMap<Integer, ManagedFacet>();
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229 int max = 0;
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230 for (ManagedFacet mf: currentFacets) {
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231 int pos = mf.getPosition();
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232 mfmap.put(Integer.valueOf(pos), mf);
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233 if (pos > max) max = pos;
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234 }
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235
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236 // Finally do gap correction.
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237 if (max != currentFacets.size()) {
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238 int gap = 0;
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239 for (int i = 1; i <= max; i++) {
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240 ManagedFacet mf = mfmap.get(Integer.valueOf(i));
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241 if (mf == null) {
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242 gap++;
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diff changeset
243 continue;
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244 }
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245 mf.setPosition(mf.getPosition() - gap);
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246 }
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247 }
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248
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249 // Now add all facets.
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250 for (ManagedFacet oldMF: currentFacets) {
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251 Node node = oldMF.toXML(doc);
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252 if (node != null) {
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253 output.appendChild(node);
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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
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259 /**
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260 * Returns the facet to be added to Document.
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261 * Return the new facet only if the "same" facet was not present before.
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262 * Return the "old" facet otherwise (user-defined information sticks
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263 * to it).
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264 * @param facet the new facet.
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265 * @param oldFacets the old facets, new facet is compared against each of
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266 * these.
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267 * @return facet if genuinely new, matching old facet otherwise.
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268 */
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269 protected ManagedFacet pickFacet(ManagedFacet facet,
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270 List<Facet> oldFacets)
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271 {
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272 if (oldFacets == null) {
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273 logger.debug("No old facets to compare a new to found.");
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274 return facet;
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275 }
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276
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277 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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278
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279 // Compare "new" facet with all old facets.
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280 // Take oldFacet if that facet was already present (otherwise
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281 // information is lost, the new one otherwise.
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282 for (Facet oFacet: oldFacets) {
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283 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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284 String oldHash = oldFacet.getName()
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285 + oldFacet.getIndex()
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286 + oldFacet.getArtifact();
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287 if (hash.equals(oldHash)) {
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288 return oldFacet;
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289 }
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290 }
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291 return facet;
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292 }
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293 }
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294 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org