Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/CollectionDescriptionHelper.java @ 3606:2b308a5d5281

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Fix for NPE flys-artifacts/trunk@5233 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Christian Lins <christian.lins@intevation.de>
date Wed, 22 Aug 2012 12:25:28 +0000
parents 4a76da133144
children a5f65e8983be
rev   line source
1972
3c3e81fca092 Added a CollectionDescriptionHelper that helps generating DESCRIBE documents for Collections.
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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.Date;
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5 import java.util.List;
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6
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7 import javax.xml.xpath.XPathConstants;
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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 import org.w3c.dom.NodeList;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import de.intevation.artifacts.ArtifactDatabase;
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17 import de.intevation.artifacts.ArtifactDatabaseException;
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18 import de.intevation.artifacts.ArtifactNamespaceContext;
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19 import de.intevation.artifacts.CallContext;
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20
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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
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25 public class CollectionDescriptionHelper {
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26
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27 private static final Logger logger =
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28 Logger.getLogger(CollectionDescriptionHelper.class);
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29
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31 public static final String XPATH_ARTIFACT_STATE_DATA =
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32 "/art:result/art:ui/art:static/art:state/art:data";
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33
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34 /** Constant XPath that points to the outputmodes of an artifact. */
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35 public static final String XPATH_ARTIFACT_OUTPUTMODES =
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36 "/art:result/art:outputmodes";
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37
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38
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39 protected ElementCreator ec;
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40
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41 protected CallContext context;
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42 protected ArtifactDatabase database;
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43
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44 protected String name;
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45 protected String uuid;
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46 protected Date creation;
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47 protected long ttl;
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48
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49 protected List<String> artifacts;
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50 protected CollectionAttribute attribute;
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51
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52
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53 /**
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54 * @param name The name of the collection.
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55 * @param uuid The uuid of the collection.
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56 * @param creation The creation time of the collection.
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57 * @param ttl The time to live of the collection.
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58 */
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59 public CollectionDescriptionHelper(
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60 String name,
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61 String uuid,
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62 Date creation,
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63 long ttl,
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64 CallContext callContext
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65 ) {
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66 this.name = name;
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67 this.uuid = uuid;
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68 this.creation = creation;
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69 this.ttl = ttl;
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70 this.context = callContext;
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71 this.database = callContext.getDatabase();
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72 }
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73
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74
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75 public void addArtifact(String uuid) {
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76 if (artifacts == null) {
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77 artifacts = new ArrayList<String>();
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78 }
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79
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80 if (uuid != null && uuid.length() > 0) {
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81 artifacts.add(uuid);
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82 }
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83 }
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84
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85
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86 public void setAttribute(CollectionAttribute attribute) {
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87 if (attribute != null) {
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88 this.attribute = attribute;
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89 }
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90 }
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91
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92
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93 public Document toXML() {
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94 Document doc = XMLUtils.newDocument();
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95
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96 ec = 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 root = ec.create("artifact-collection");
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102 doc.appendChild(root);
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103
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104 String creationTime = creation != null
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105 ? Long.toString(creation.getTime())
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106 : "";
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107
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108 ec.addAttr(root, "name", name, true);
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109 ec.addAttr(root, "uuid", uuid, true);
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110 ec.addAttr(root, "creation", creationTime, true);
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111 ec.addAttr(root, "ttl", String.valueOf(ttl), true);
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112
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113 appendArtifacts(root);
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114 appendAttribute(root);
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115
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116 return doc;
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117 }
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118
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119
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120 /**
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121 * Appends parts of the DESCRIBE document of each Artifact to <i>root</i>.
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122 *
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123 * @param root The root node.
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124 */
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125 protected void appendArtifacts(Element root) {
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126 Element artifactsEl = ec.create("artifacts");
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127
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128 for (String uuid: artifacts) {
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129 try {
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130 Element e = buildArtifactNode(uuid);
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131
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132 if (e != null) {
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133 artifactsEl.appendChild(e);
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134 }
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135 }
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136 catch (ArtifactDatabaseException dbe) {
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137 logger.warn(dbe, dbe);
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138 }
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139 }
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140
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141 root.appendChild(artifactsEl);
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142 }
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143
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144
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145 /**
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146 * Create the Artifacts Node that contains outputmode and statedata.
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147 *
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148 * @param uuid uuid of the artifact.
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149 */
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150 protected Element buildArtifactNode(String uuid)
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151 throws ArtifactDatabaseException
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152 {
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153 logger.debug("Append artifact '" + uuid + "' to collection description");
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154
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155 // TODO
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156 String hash = "MYHASH";
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157
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158 Element ci = ec.create("artifact");
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159 ec.addAttr(ci, "uuid", uuid, true);
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160 ec.addAttr(ci, "hash", hash, true);
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161
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162 // XXX I am not sure if it works well every time with an empty document
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163 // in the describe operation of an artifact.
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164 Document description = database.describe(uuid, null, context.getMeta());
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165
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166 // Add outputmode element(s).
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167 Node outputModes = (Node) XMLUtils.xpath(
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168 description,
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169 XPATH_ARTIFACT_OUTPUTMODES,
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170 XPathConstants.NODE,
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171 ArtifactNamespaceContext.INSTANCE);
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172
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173 if (outputModes != null) {
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174 Document doc = ci.getOwnerDocument();
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175 ci.appendChild(doc.importNode(outputModes, true));
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176 }
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177
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178 // Add state-data element(s).
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179 Node dataNode = ci.appendChild(
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180 ci.getOwnerDocument().createElement("art:data-items"));
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181
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182 NodeList dataNodes = (NodeList) XMLUtils.xpath(
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183 description,
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184 XPATH_ARTIFACT_STATE_DATA,
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185 XPathConstants.NODESET,
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186 ArtifactNamespaceContext.INSTANCE);
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187
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188 if (dataNodes != null) {
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189 Document doc = ci.getOwnerDocument();
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190 for (int i = 0, D = dataNodes.getLength(); i < D; i++) {
1972
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191 dataNode.appendChild(doc.importNode(dataNodes.item(i), true));
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192 }
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193 }
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194
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195 return ci;
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196 }
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197
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198
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199 protected void appendAttribute(Element root) {
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200 Document owner = root.getOwnerDocument();
1976
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201 Document attr = attribute.toXML();
1972
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202
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203 root.appendChild(owner.importNode(attr.getFirstChild(), true));
1972
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204 }
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205 }
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4bd3d8bbb60c Added missing vim lines.
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206 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org