Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/CollectionDescriptionHelper.java @ 4150:0f60efc39953

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Workaround for #961
author Christian Lins <christian.lins@intevation.de>
date Tue, 16 Oct 2012 12:17:53 +0200
parents a5f65e8983be
children
rev   line source
1972
3c3e81fca092 Added a CollectionDescriptionHelper that helps generating DESCRIBE documents for Collections.
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parents:
diff changeset
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.apache.log4j.Logger;
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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 import org.w3c.dom.NodeList;
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14
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15 import de.intevation.artifacts.ArtifactDatabase;
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16 import de.intevation.artifacts.ArtifactDatabaseException;
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17 import de.intevation.artifacts.ArtifactNamespaceContext;
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18 import de.intevation.artifacts.CallContext;
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19 import de.intevation.artifacts.common.utils.XMLUtils;
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20 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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21
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22
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23 public class CollectionDescriptionHelper {
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24
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25 private static final Logger logger =
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26 Logger.getLogger(CollectionDescriptionHelper.class);
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27
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28
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29 public static final String XPATH_ARTIFACT_STATE_DATA =
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30 "/art:result/art:ui/art:static/art:state/art:data";
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31
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32 /** Constant XPath that points to the outputmodes of an artifact. */
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33 public static final String XPATH_ARTIFACT_OUTPUTMODES =
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34 "/art:result/art:outputmodes";
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35
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36
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37 protected ElementCreator ec;
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38
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39 protected CallContext context;
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40 protected ArtifactDatabase database;
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41
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42 protected String name;
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43 protected String uuid;
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44 protected Date creation;
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45 protected long ttl;
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46
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47 protected List<String> artifacts;
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48 protected CollectionAttribute attribute;
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49
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50
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51 /**
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52 * @param name The name of the collection.
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53 * @param uuid The uuid of the collection.
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54 * @param creation The creation time of the collection.
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55 * @param ttl The time to live of the collection.
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56 */
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57 public CollectionDescriptionHelper(
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58 String name,
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59 String uuid,
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60 Date creation,
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61 long ttl,
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62 CallContext callContext
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63 ) {
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64 this.name = name;
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65 this.uuid = uuid;
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66 this.creation = creation;
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67 this.ttl = ttl;
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68 this.context = callContext;
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69 this.database = callContext.getDatabase();
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70 this.artifacts = new ArrayList<String>();
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71 }
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72
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73
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74 public void addArtifact(String uuid) {
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75 if (uuid != null && uuid.length() > 0) {
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76 artifacts.add(uuid);
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77 }
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78 }
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79
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80
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81 public void setAttribute(CollectionAttribute attribute) {
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82 if (attribute != null) {
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83 this.attribute = attribute;
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84 }
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85 }
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86
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87
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88 public Document toXML() {
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89 Document doc = XMLUtils.newDocument();
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90
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91 ec = new ElementCreator(
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92 doc,
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93 ArtifactNamespaceContext.NAMESPACE_URI,
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94 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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95
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96 Element root = ec.create("artifact-collection");
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97 doc.appendChild(root);
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98
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99 String creationTime = creation != null
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100 ? Long.toString(creation.getTime())
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101 : "";
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102
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103 ec.addAttr(root, "name", name, true);
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104 ec.addAttr(root, "uuid", uuid, true);
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105 ec.addAttr(root, "creation", creationTime, true);
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106 ec.addAttr(root, "ttl", String.valueOf(ttl), true);
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107
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108 appendArtifacts(root);
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109 appendAttribute(root);
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110
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111 return doc;
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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 * Appends parts of the DESCRIBE document of each Artifact to <i>root</i>.
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117 *
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118 * @param root The root node.
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119 */
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120 protected void appendArtifacts(Element root) {
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121 Element artifactsEl = ec.create("artifacts");
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122
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123 for (String uuid: artifacts) {
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124 try {
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125 Element e = buildArtifactNode(uuid);
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126
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127 if (e != null) {
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128 artifactsEl.appendChild(e);
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129 }
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130 }
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131 catch (ArtifactDatabaseException dbe) {
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132 logger.warn(dbe, dbe);
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133 }
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134 }
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135
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136 root.appendChild(artifactsEl);
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137 }
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138
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139
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140 /**
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141 * Create the Artifacts Node that contains outputmode and statedata.
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142 *
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143 * @param uuid uuid of the artifact.
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144 */
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145 protected Element buildArtifactNode(String uuid)
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146 throws ArtifactDatabaseException
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147 {
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148 logger.debug("Append artifact '" + uuid + "' to collection description");
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149
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150 // TODO
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151 String hash = "MYHASH";
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152
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153 Element ci = ec.create("artifact");
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154 ec.addAttr(ci, "uuid", uuid, true);
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155 ec.addAttr(ci, "hash", hash, true);
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156
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157 // XXX I am not sure if it works well every time with an empty document
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158 // in the describe operation of an artifact.
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159 Document description = database.describe(uuid, null, context.getMeta());
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160
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161 // Add outputmode element(s).
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162 Node outputModes = (Node) XMLUtils.xpath(
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163 description,
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164 XPATH_ARTIFACT_OUTPUTMODES,
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165 XPathConstants.NODE,
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166 ArtifactNamespaceContext.INSTANCE);
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167
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168 if (outputModes != null) {
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169 Document doc = ci.getOwnerDocument();
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170 ci.appendChild(doc.importNode(outputModes, true));
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171 }
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172
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173 // Add state-data element(s).
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174 Node dataNode = ci.appendChild(
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175 ci.getOwnerDocument().createElement("art:data-items"));
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176
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177 NodeList dataNodes = (NodeList) XMLUtils.xpath(
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178 description,
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179 XPATH_ARTIFACT_STATE_DATA,
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180 XPathConstants.NODESET,
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181 ArtifactNamespaceContext.INSTANCE);
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182
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183 if (dataNodes != null) {
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184 Document doc = ci.getOwnerDocument();
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185 for (int i = 0, D = dataNodes.getLength(); i < D; i++) {
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186 dataNode.appendChild(doc.importNode(dataNodes.item(i), true));
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187 }
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188 }
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189
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190 return ci;
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191 }
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192
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193
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194 protected void appendAttribute(Element root) {
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195 if (attribute != null) {
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196 Document owner = root.getOwnerDocument();
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197 Document attr = attribute.toXML();
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198
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199 root.appendChild(owner.importNode(attr.getFirstChild(), true));
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200 }
1972
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201 }
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202 }
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203 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org