Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 5449:504a62887217

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Datacage: Compile XPath expressions and reuse them. With the introduction of filters in dc:elements XPath expressions are evalutated very often so compiling them should reduce the overhead significantly.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 27 Mar 2013 10:59:55 +0100
parents 345f3bba6f15
children
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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12
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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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16
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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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0b466bd4ab24 Introduced a CollectionAttribute class that stores the information provided by the Collection's attribute document.
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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 * @param matrix Compatibility matrix, mapping output names to list of
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63 * facet names that can be included in this out.
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64 */
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65 public AttributeWriter(
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66 ArtifactDatabase db,
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67 CollectionAttribute attribute,
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68 Map<String, Output> oldAttr,
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69 List<Facet> oldFacets,
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70 Map<String, Output> newAttr,
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71 List<Facet> newFacets,
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72 Map<String, List<String>> matrix)
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73 {
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74 this.db = db;
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75 this.attribute = attribute;
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76 this.oldAttr = oldAttr;
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77 this.newAttr = newAttr;
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78 this.oldFacets = oldFacets;
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79 this.newFacets = newFacets;
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80 this.compatibilities = matrix;
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81 }
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82
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83
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84 /**
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85 * Create document by merging outputs given in
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86 * constructor.
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87 *
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88 * The "new" set rules about existance of attributes, so anything not
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89 * present in it will not be included in the resulting document.
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90 * The "old" set rules about the content of attributes (as user changes
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91 * are recorded here and not in the new set).
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92 *
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93 * @return document with merged outputs as described.
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94 */
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95 protected CollectionAttribute write() {
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97 boolean debug = logger.isDebugEnabled();
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98
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99 for (Map.Entry<String, Output> entry: newAttr.entrySet()) {
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100 String outName = entry.getKey();
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101 Output a = entry.getValue();
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102
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103 if (!attribute.hasOutput(outName)) {
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104 attribute.addOutput(outName, a);
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105 }
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106
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107 attribute.clearFacets(outName);
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108
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109 if (debug) {
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110 logger.debug("Merge Output: " + outName);
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111 logger.debug(" old Facets: " + oldFacets.size());
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112 logger.debug(" new Facets: " + newFacets.size());
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113 }
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114
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115 writeOutput(a.getName(), newFacets, oldFacets);
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116 }
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117
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118 // THIS CALL IS ABSOLUTELY NECESSARY!
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119 attribute.cleanEmptyOutputs();
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120
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121 return attribute;
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122 }
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123
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124
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125 /**
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126 * @param outputName the "new" outputs name
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127 * @param newOutFacets Facets of the new outputs
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128 * @param oldOutFacets Facets of the old outputs (can be null)
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129 */
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130 protected void writeOutput(
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131 String outputName,
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132 List<Facet> newOutFacets,
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133 List<Facet> oldOutFacets
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134 ) {
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135 List<String> compatFacets = this.compatibilities.get(outputName);
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136
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137 if (logger.isDebugEnabled() && compatFacets != null) {
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138 logger.debug("Compabitle Facets:");
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139 for (String compatible: compatFacets) {
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140 logger.debug( "- " + compatible);
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141 }
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142 }
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143
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144 try {
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145 writeFacets(outputName, newOutFacets, oldOutFacets, compatFacets);
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146 }
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147 catch (ArtifactDatabaseException ade) {
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148 logger.error(ade, ade);
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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 /**
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154 * @param newFacets the new facets
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155 * @param oldFacets the old facets
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156 * @param compatibleFacets List of facets to accept
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157 * @return true if any facets are written to the out.
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158 */
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159 protected boolean writeFacets(
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160 String outputName,
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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 " + outputName + ".");
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168 return false;
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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 boolean debug = logger.isDebugEnabled();
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179 if (debug) {
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180 logger.debug("Compatible facets are " + compatibleFacets);
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181 }
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182
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183 for (int i = 0; i < num; i++) {
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184 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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185
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186 if (debug) {
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187 logger.debug("Try to add Facet: " + facet.getName());
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188 }
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189
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190 if (!compatibleFacets.contains(facet.getName())) {
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191 logger.warn("Have incompatible facet, skip: " + facet.getName());
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192 continue;
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193 }
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194 else {
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195 logger.debug("Have compatible facet: " + facet.getName());
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196 }
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197
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198 ManagedFacet picked = pickFacet(facet, oldFacets);
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199
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200 if (facet.equals(picked)) {
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201 genuinelyNewFacets.add(picked);
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202 }
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203 else {
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204 currentFacets.add(picked);
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205 }
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206 }
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207
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208 FacetActivity.Registry registry = FacetActivity.Registry.getInstance();
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209
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210 // With each genuinely new Facet, figure out whether it comes to live
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211 // in/activate.
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212 for (ManagedFacet newMF: genuinelyNewFacets) {
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213 FLYSArtifact flys =
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214 (FLYSArtifact)db.getRawArtifact(newMF.getArtifact());
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215
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216 boolean isActive = registry.isInitialActive(
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217 flys.getName(), flys, newMF, outputName);
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218
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219 newMF.setActive(isActive ? 1 : 0);
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220 }
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221
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222 // For each genuinely new Facet check positional conflicts.
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223 for (ManagedFacet newMF: genuinelyNewFacets) {
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224 boolean conflicts = true;
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225 // Loop until all conflicts resolved.
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226 while (conflicts) {
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227 conflicts = false;
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228 for (ManagedFacet oldMF: currentFacets) {
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229 if (newMF.getPosition() == oldMF.getPosition()) {
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230 conflicts = true;
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231 if (debug) {
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232 logger.debug(
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233 "Positional conflict while merging " +
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234 "facets, pushing newest facet 1 up (" +
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235 newMF.getPosition() + ")");
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236 }
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237 newMF.setPosition(newMF.getPosition() + 1);
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238 break;
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239 }
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240 }
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241 }
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242 currentFacets.add(newMF);
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243 }
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244
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245 // Fill/correct "gaps" (e.g. position 1,2,5 are taken, after gap filling
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246 // expect positions 1,2,3 [5->3])
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247 // Preparations to be able to detect gaps.
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248 Map<Integer, ManagedFacet> mfmap =
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249 new HashMap<Integer, ManagedFacet>();
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250 int max = 0;
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251 for (ManagedFacet mf: currentFacets) {
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252 int pos = mf.getPosition();
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253 mfmap.put(Integer.valueOf(pos), mf);
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254 if (pos > max) max = pos;
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255 }
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256
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257 // Finally do gap correction.
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258 if (max != currentFacets.size()) {
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259 int gap = 0;
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260 for (int i = 1; i <= max; i++) {
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261 ManagedFacet mf = mfmap.get(Integer.valueOf(i));
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262 if (mf == null) {
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263 gap++;
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264 continue;
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265 }
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266 mf.setPosition(mf.getPosition() - gap);
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267 }
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268 }
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269
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270 // Now add all facets.
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271 for (ManagedFacet oldMF: currentFacets) {
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272 attribute.addFacet(outputName, oldMF);
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273 }
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274
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275 return !currentFacets.isEmpty();
346
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276 }
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277
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278
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279 /**
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280 * Returns the facet to be added to Document.
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281 * Return the new facet only if the "same" facet was not present before.
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282 * Return the "old" facet otherwise (user-defined information sticks
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283 * to it).
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284 * @param facet the new facet.
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285 * @param oldFacets the old facets, new facet is compared against each of
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286 * these.
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287 * @return facet if genuinely new, matching old facet otherwise.
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288 */
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289 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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290 {
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291 if (oldFacets == null) {
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292 logger.debug("No old facets to compare a new to found.");
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293 return facet;
346
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294 }
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295
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296 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
346
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297
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298 // Compare "new" facet with all old facets.
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299 // Take oldFacet if that facet was already present (otherwise
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300 // information is lost, the new one otherwise.
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301 for (Facet oFacet: oldFacets) {
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302 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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303 String oldHash = oldFacet.getName()
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304 + oldFacet.getIndex()
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305 + oldFacet.getArtifact();
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306 if (hash.equals(oldHash)) {
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307 return oldFacet;
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308 }
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309 }
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310 return facet;
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311 }
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312 }
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853dceead0f4 Only generate facets when needed.
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313 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org