Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 1882:d67a9ca116c3

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Last commit broke due to network error. flys-artifacts/trunk@3241 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 12 Nov 2011 12:07:39 +0000
parents 490ab097f58c
children 0b466bd4ab24
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.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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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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137
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138 List<String> compatibleFacets = this.compatibilities.get(outputName);
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139 try {
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140 if (writeFacets(
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141 doc, cr, output, newOutFacets, oldOutFacets,
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142 compatibleFacets))
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143 {
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144 // Add output element only if it contains facets.
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145 outs.appendChild(output);
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146 }
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147 }
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148 catch (ArtifactDatabaseException ade) {
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149 logger.error(ade, ade);
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150 }
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151 }
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152
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153
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154 /**
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155 * @param doc Document to add facet nodes to
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156 * @param cr ElementCreator to use with output/doc
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157 * @param output Node in Document to add facet nodes to
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158 * @param newFacets the new facets
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159 * @param oldFacets the old facets
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160 * @param compatibleFacets List of facets to accept
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161 * @return true if any facets are written to the out.
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162 */
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163 protected boolean writeFacets(
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164 Document doc,
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165 ElementCreator cr,
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166 Element output,
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167 List<Facet> newFacets,
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168 List<Facet> oldFacets,
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169 List<String> compatibleFacets)
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170 throws ArtifactDatabaseException
346
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171 {
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172 if (compatibleFacets == null) {
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173 logger.warn("No compatible facets, not generating out.");
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174 return false;
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175 }
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176
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177 int num = newFacets.size();
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178
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179 // Add all new Facets either in their old state or (if really
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180 // new) as they are.
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181 List<ManagedFacet> currentFacets = new ArrayList<ManagedFacet>();
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182 List<ManagedFacet> genuinelyNewFacets = new ArrayList<ManagedFacet>();
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183
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184 for (int i = 0; i < num; i++) {
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185 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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186 if (!compatibleFacets.contains(facet.getName())) {
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187 //logger.debug("Have incompatible facet, skip: " + facet.getName());
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188 continue;
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189 }
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190 //else logger.debug("Have compatible facet: " + facet.getName());
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191
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192 ManagedFacet picked = pickFacet(facet, oldFacets);
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193
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194 if (facet.equals(picked)) {
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195 genuinelyNewFacets.add(picked);
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196 }
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197 else {
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198 currentFacets.add(picked);
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199 }
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200 }
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201
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202 // With each genuinely new Facet, ask Artifact whether it comes to live
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203 // in/activate.
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204 for (ManagedFacet newMF: genuinelyNewFacets) {
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205 FLYSArtifact flys = (FLYSArtifact) db.getRawArtifact(newMF.getArtifact());
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206 newMF.setActive(flys.getInitialFacetActivity(
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207 output.getAttribute("name"),
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208 newMF.getName(),
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209 newMF.getIndex()));
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210 }
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211
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212 // For each genuinely new Facet check positional conflicts.
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213 for (ManagedFacet newMF: genuinelyNewFacets) {
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214 boolean conflicts = true;
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215 // Loop until all conflicts resolved.
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216 while (conflicts) {
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217 conflicts = false;
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218 for (ManagedFacet oldMF: currentFacets) {
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219 if (newMF.getPosition() == oldMF.getPosition()) {
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220 conflicts = true;
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221 logger.debug("Positional conflict while merging " +
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222 "facets, pushing newest facet 1 up (" + newMF.getPosition() + ")");
1639
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223 newMF.setPosition(newMF.getPosition() + 1);
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224 break;
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225 }
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226 }
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227 }
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228 currentFacets.add(newMF);
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229 }
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230
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231 // Fill/correct "gaps" (e.g. position 1,2,5 are taken, after gap filling
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232 // expect positions 1,2,3 [5->3])
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233 // Preparations to be able to detect gaps.
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234 Map<Integer, ManagedFacet> mfmap = new HashMap<Integer, ManagedFacet>();
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diff changeset
235 int max = 0;
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236 for (ManagedFacet mf: currentFacets) {
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237 int pos = mf.getPosition();
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238 mfmap.put(Integer.valueOf(pos), mf);
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239 if (pos > max) max = pos;
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240 }
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241
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242 // Finally do gap correction.
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diff changeset
243 if (max != currentFacets.size()) {
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diff changeset
244 int gap = 0;
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diff changeset
245 for (int i = 1; i <= max; i++) {
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diff changeset
246 ManagedFacet mf = mfmap.get(Integer.valueOf(i));
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diff changeset
247 if (mf == null) {
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diff changeset
248 gap++;
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diff changeset
249 continue;
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250 }
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diff changeset
251 mf.setPosition(mf.getPosition() - gap);
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252 }
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253 }
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254
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255 // Now add all facets.
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256 for (ManagedFacet oldMF: currentFacets) {
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257 Node node = oldMF.toXML(doc);
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258 if (node != null) {
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259 output.appendChild(node);
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260 }
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261 }
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262
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263 return currentFacets.size() > 0;
346
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264 }
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265
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266
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267 /**
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268 * Returns the facet to be added to Document.
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269 * Return the new facet only if the "same" facet was not present before.
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270 * Return the "old" facet otherwise (user-defined information sticks
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271 * to it).
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272 * @param facet the new facet.
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273 * @param oldFacets the old facets, new facet is compared against each of
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274 * these.
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275 * @return facet if genuinely new, matching old facet otherwise.
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276 */
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277 protected ManagedFacet pickFacet(ManagedFacet facet,
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278 List<Facet> oldFacets)
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279 {
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280 if (oldFacets == null) {
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281 logger.debug("No old facets to compare a new to found.");
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282 return facet;
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283 }
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284
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285 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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286
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287 // Compare "new" facet with all old facets.
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288 // Take oldFacet if that facet was already present (otherwise
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289 // information is lost, the new one otherwise.
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290 for (Facet oFacet: oldFacets) {
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291 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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292 String oldHash = oldFacet.getName()
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293 + oldFacet.getIndex()
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294 + oldFacet.getArtifact();
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295 if (hash.equals(oldHash)) {
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296 return oldFacet;
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297 }
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298 }
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299 return facet;
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300 }
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301 }
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302 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org