Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/AttributeWriter.java @ 1635:1b5204203e18

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Minor refactoring, documentation. flys-artifacts/trunk@2814 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 23 Sep 2011 07:19:41 +0000
parents cc47828a1390
children 12235a2ace21
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.List;
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4 import java.util.Map;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10 import org.w3c.dom.Node;
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11
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12 import de.intevation.artifacts.ArtifactNamespaceContext;
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13
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14 import de.intevation.artifactdatabase.state.Facet;
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15 import de.intevation.artifactdatabase.state.Output;
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16
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17 import de.intevation.artifacts.common.utils.XMLUtils;
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18 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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19
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20 import de.intevation.flys.artifacts.model.ManagedFacet;
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22 /**
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23 * Create attribute- element of describe document of an ArtifactCollection.
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24 * The attribute-element contains the merged output of all outputmodes and
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25 * facets that are part of the collection.
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26 */
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27 public class AttributeWriter {
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28
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29 protected Map<String, Output> oldAttr;
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30 protected Map<String, Output> newAttr;
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31
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32 private static Logger logger = Logger.getLogger(AttributeWriter.class);
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33
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34
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35 /**
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36 * Create a AttributeWriter.
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37 * Attributes not present in newAttr will not be included in the document.
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38 * @param oldAttr "Old" (possibly user-changed) outputs.
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39 * @param newAttr "New" (eventually re-read in its original, unchagnged
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40 * form) outputs.
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41 */
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42 public AttributeWriter(
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43 Map<String, Output> oldAttr,
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44 Map<String, Output> newAttr)
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45 {
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46 this.oldAttr = oldAttr;
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47 this.newAttr = newAttr;
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48 }
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50
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51 /**
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52 * Create document by merging outputs given in
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53 * constructor.
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54 * The "new" set rules about existance of attributes, so anything not
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55 * present in it will not be included in the resulting document.
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56 * The "old" set rules about the content of attributes (as user changes
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57 * are recorded here and not in the new set).
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58 * @return document with merged outputs as described.
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59 */
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60 protected Document write() {
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61 Document doc = XMLUtils.newDocument();
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62
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63 ElementCreator cr = new ElementCreator(
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64 doc,
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65 ArtifactNamespaceContext.NAMESPACE_URI,
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66 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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67
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68 Element attribute = cr.create("attribute");
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69 Element outs = cr.create("outputs");
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70
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71 attribute.appendChild(outs);
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72 doc.appendChild(attribute);
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73
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74 for (String outName: newAttr.keySet()) {
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75
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76 Output a = newAttr.get(outName);
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77 Output b = oldAttr.get(outName);
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78
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79 writeOutput(doc, outs, cr, a, b);
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80 }
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81
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82 return doc;
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83 }
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84
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86 /**
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87 * @param doc Document to add output nodes to
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88 * @param outs Node in Document to add output nodes to
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89 * @param a the new output
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90 * @param b the old output
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91 */
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92 protected void writeOutput(
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93 Document doc,
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94 Node outs,
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95 ElementCreator cr,
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96 Output a, /* new output */
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97 Output b) /* old output */
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98 {
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99 Element output = cr.create("output");
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100 cr.addAttr(output, "name", a.getName());
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101
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102 outs.appendChild(output);
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103
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104 List<Facet> facetsA = a.getFacets();
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105 List<Facet> facetsB = null;
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106
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107 if (b != null) {
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108 facetsB = b.getFacets();
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109 }
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110
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111 writeFacets(doc, cr, output, facetsA, facetsB);
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112 }
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113
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114
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115 /**
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116 * @param doc Document to add facet nodes to
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117 * @param output Node in Document to add facet nodes to
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118 * @param a the new facets
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119 * @param b the old facets
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120 */
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121 protected void writeFacets(
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122 Document doc,
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123 ElementCreator cr,
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124 Element output,
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125 List<Facet> newFacets,
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126 List<Facet> oldFacets)
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127 {
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128 int num = newFacets.size();
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129
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130 // Add all new Facets either in their old state or (if really
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131 // new) as they are.
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132 for (int i = 0; i < num; i++) {
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133 ManagedFacet facet = (ManagedFacet) newFacets.get(i);
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134
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135 ManagedFacet picked = pickFacet(facet, oldFacets);
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136 Node node = picked.toXML(doc);
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137 if (node != null) {
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138 output.appendChild(node);
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139 }
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140 }
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141 }
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142
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143
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144 /**
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145 * Returns the facet to be added to Document.
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146 * Return the new facet only if the "same" facet was not present before.
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147 * Return the "old" facet otherwise (user-defined information sticks
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148 * to it).
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149 * @param facet the new facet.
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150 * @param oldFacets the old facets, new facet is compared against each of
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151 * these.
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152 * @return facet if genuinely new, matching old facet otherwise.
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153 */
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154 protected ManagedFacet pickFacet(ManagedFacet facet,
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155 List<Facet> oldFacets) {
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156 if (oldFacets == null) {
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157 logger.debug("No old facets to compare a new to found.");
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158 return facet;
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159 }
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160
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161 String hash = facet.getName() + facet.getIndex() + facet.getArtifact();
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162
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163 // Compare "new" facet with all old facets.
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164 // Take oldFacet if that facet was already present (otherwise
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165 // information is lost, the new one otherwise.
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166 for (Facet oFacet: oldFacets) {
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167 ManagedFacet oldFacet = (ManagedFacet) oFacet;
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168 String oldHash = oldFacet.getName()
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169 + oldFacet.getIndex()
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170 + oldFacet.getArtifact();
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171 if (hash.equals(oldHash)) {
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172 return oldFacet;
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173 }
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174 }
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175 return facet;
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176 }
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177 }
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178 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org