Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/MetaWriter.java @ 819:6925d18580c0

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Added more Javadoc. gnv-artifacts/trunk@905 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 12 Apr 2010 13:12:21 +0000
parents a645bd23c1c8
children 164d102b0af5
rev   line source
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1 package de.intevation.gnv.utils;
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2
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3 import de.intevation.artifactdatabase.XMLUtils;
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4
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5 import de.intevation.artifacts.ArtifactNamespaceContext;
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6 import de.intevation.artifacts.CallContext;
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7
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8 import de.intevation.gnv.artifacts.context.GNVArtifactContext;
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9
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10 import de.intevation.gnv.wms.LayerInfo;
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11
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12 import java.io.File;
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13 import java.io.FileNotFoundException;
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14 import java.io.FileOutputStream;
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15 import java.io.IOException;
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16 import java.io.OutputStream;
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17
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18 import java.util.Date;
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19
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20 import org.apache.log4j.Logger;
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21
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22 import org.w3c.dom.Document;
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23 import org.w3c.dom.Element;
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24
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25 /**
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26 * This class provides some methods to create files storing meta information
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27 * about wms layers and a map service which serves these layers.
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28 *
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 */
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31 public class MetaWriter {
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32
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33 private static Logger logger = Logger.getLogger(MetaWriter.class);
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34
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35 public static final String NODE_MAPSERVER = "mapserver";
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36 public static final String NODE_SERVER = "server";
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37 public static final String NODE_MAP = "map";
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38 public static final String NODE_TTL = "ttl";
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39
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40 public static final String META_FILE_NAME = "meta.xml";
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41 public static final String ISOLINES_NAME = "isolines.shp";
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42 public static final String POLYGON_NAME = "polygons.shp";
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43 public static final String LAYER_DATA_NAME = "data.shp";
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44
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45 public static final String CONTEXT_LAYER_TITLE = "wms.title";
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46
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47 /**
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48 * Constructor.
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49 */
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50 private MetaWriter() {
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51 }
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52
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53 /**
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54 * Writes a meta information file for product type 'Layer'.
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55 *
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56 * @param context CallContext object.
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57 * @param uuid The UUID of the current artifact.
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58 * @param path The destination of the meta file.
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59 * @param paramType The parameter type.
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60 * @param layerType The layer type.
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61 * @return the meta document.
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62 */
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63 public static Document writeLayerMeta(CallContext context,
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64 String uuid,
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65 String path,
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66 String paramType,
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67 String layerType){
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68 Document meta = XMLUtils.newDocument();
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69 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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70 meta,
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71 ArtifactNamespaceContext.NAMESPACE_URI,
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72 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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73 Element root = creator.create("meta");
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74 meta.appendChild(root);
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75
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76 writeAbstractMeta(context, meta, root);
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77 writeLayerMeta(context, meta, root, uuid, paramType,layerType);
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78 boolean success = writeMetaFile(path, meta);
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79
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80 if (success){
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81 return meta;
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82 }else{
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83 return null;
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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 /**
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89 * Writes a meta information file for product type 'Horizontalschnitt'.
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90 *
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91 * @param context The CallContext object.
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92 * @param uuid The UUID of the current artifact.
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93 * @param path The destination of the meta file.
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94 * @param paramType The parameter type.
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95 * @return the meta document.
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96 */
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97 public static Document writeHorizontalcrosssectionMeta(
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98 CallContext context,
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99 String uuid,
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100 String path,
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101 String paramType)
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102 {
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103 Document meta = XMLUtils.newDocument();
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104 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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105 meta,
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106 ArtifactNamespaceContext.NAMESPACE_URI,
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107 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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108
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109 Element root = creator.create("meta");
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110 meta.appendChild(root);
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111
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112 writeAbstractMeta(context, meta, root);
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113 writePolygonMeta(context, meta, root, uuid, paramType);
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114 writeIsolineMeta(context, meta, root, uuid, paramType);
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115
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116 boolean success = writeMetaFile(path, meta);
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117
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118 if (success){
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119 return meta;
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120 }else{
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121 return null;
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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 * Method to write the <i>meta</i> document down to a file.
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127 *
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128 * @param path The destination of the file.
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129 * @param meta The xml document storing the meta information.
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130 */
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131 private static boolean writeMetaFile(String path, Document meta) {
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132 try {
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133 File metaFile = new File(path, META_FILE_NAME);
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134
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135 if (metaFile.exists()) {
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136 logger.info("Delete old meta information file.");
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137 metaFile.delete();
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138 }
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139
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140 if (!metaFile.createNewFile() || !metaFile.canWrite()) {
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141 logger.error("Error while writing meta file: "+metaFile.toString());
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142 return false;
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143 }
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144
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145 OutputStream out = null;
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146 boolean success = false;
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147 try {
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148 out = new FileOutputStream(metaFile);
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149 success = XMLUtils.toStream(meta, out);
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150 }
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151 finally {
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152 if (out != null) {
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153 try { out.close(); }
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154 catch (IOException ioe) {}
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155 }
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156 }
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157
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158 if (!success && metaFile.exists()) {
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159 metaFile.delete();
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160 }
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161
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162 return success;
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163 }
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164 catch (FileNotFoundException fnfe) {
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165 logger.error(fnfe);
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166 return false;
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167 }
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168 catch (IOException ioe) {
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169 logger.error(ioe, ioe);
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170 return false;
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171 }
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172 }
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173
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174
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175 /**
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176 * Append meta information about the mapservice itself.
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177 *
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178 * @param callContext The CallContext object.
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179 * @param document The meta information document.
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180 * @param meta The element where the new information need to be appended to.
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181 */
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182 public static void writeAbstractMeta(
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183 CallContext callContext,
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184 Document document,
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185 Element meta
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186 ) {
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187 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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188 document,
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189 ArtifactNamespaceContext.NAMESPACE_URI,
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190 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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191
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192 GNVArtifactContext context =
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193 (GNVArtifactContext) callContext.globalContext();
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194
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195 String server = (String)
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196 context.get(GNVArtifactContext.MAPSERVER_SERVER_PATH_KEY);
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197
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198 String map = (String)
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199 context.get(GNVArtifactContext.MAPSERVER_MAP_PATH_KEY);
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200
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201 if (logger.isDebugEnabled()) {
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202 logger.debug("MAPSERVER PATH: " + server);
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203 logger.debug("MAP PATH: " + map);
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204 }
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205
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206 Element mapserver = creator.create(NODE_MAPSERVER);
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207 Element serverPath = creator.create(NODE_SERVER);
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208 Element mapPath = creator.create(NODE_MAP);
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209
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210 mapPath.setTextContent(map);
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211 serverPath.setTextContent(server);
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212
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213 mapserver.appendChild(serverPath);
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214 mapserver.appendChild(mapPath);
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215 meta.appendChild(mapserver);
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216 }
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217
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218 /**
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219 * Append layer information to the meta document.
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220 *
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221 * @param callContext The CallContext object.
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222 * @param document The meta document.
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223 * @param meta The element where the new information need to be appended to.
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224 * @param uuid The UUID of the current artifact.
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225 * @param paramType The parameter type (e.g. salinity).
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226 * @param layerType The layer type.
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227 */
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228 protected static void writeLayerMeta(
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229 CallContext callContext,
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230 Document document,
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231 Element meta,
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232 String uuid,
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233 String paramType,
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234 String layerType
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235 ) {
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236 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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237 document,
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238 ArtifactNamespaceContext.NAMESPACE_URI,
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239 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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240
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241 Long time = callContext.getTimeToLive();
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242 time = time != null ? time + new Date().getTime() : null;
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243 String ttl = time != null ? time.toString() : null;
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244
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245 logger.debug("Artifacts time to live: " + ttl);
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246
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247 Element layer = creator.create(LayerInfo.LAYER);
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248 Element model = creator.create(LayerInfo.LAYER_MODEL);
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249 Element name = creator.create(LayerInfo.LAYER_NAME);
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250 Element type = creator.create(LayerInfo.LAYER_TYPE);
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251 Element status = creator.create(LayerInfo.LAYER_STATUS);
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252 Element data = creator.create(LayerInfo.LAYER_DATA);
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253 Element timeToLive = creator.create(NODE_TTL);
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254
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255 model.setTextContent(paramType);
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256 name.setTextContent(uuid);
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257 type.setTextContent(layerType);
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258 status.setTextContent("OFF");
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259 data.setTextContent(LAYER_DATA_NAME);
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260 timeToLive.setTextContent(ttl);
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261
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262 layer.appendChild(model);
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263 layer.appendChild(name);
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264 layer.appendChild(type);
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265 layer.appendChild(status);
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266 layer.appendChild(data);
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267 layer.appendChild(timeToLive);
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268
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269 meta.appendChild(layer);
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270 }
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271
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272
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273 /**
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274 * Append polygon layer information to meta document.
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275 *
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276 * @param context
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277 * @param document The meta document.
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278 * @param meta The element where the new information need to be appended to.
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279 * @param uuid The UUID of the current artifact.
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280 * @param paramType The parameter type (e.g. salinity).
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281 */
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282 public static void writePolygonMeta(
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283 CallContext context,
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284 Document document,
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285 Element meta,
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286 String uuid,
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287 String paramType
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288 ) {
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289 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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290 document,
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291 ArtifactNamespaceContext.NAMESPACE_URI,
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292 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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293
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294 Long time = context.getTimeToLive();
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295 time = time != null ? time + new Date().getTime() : null;
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296 String ttl = time != null ? time.toString() : null;
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297
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298 logger.debug("Artifacts time to live: " + ttl);
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299
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300 Element layer = creator.create(LayerInfo.LAYER);
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301 Element model = creator.create(LayerInfo.LAYER_MODEL);
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302 Element name = creator.create(LayerInfo.LAYER_NAME);
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303 Element title = creator.create(LayerInfo.LAYER_TITLE);
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304 Element type = creator.create(LayerInfo.LAYER_TYPE);
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305 Element status = creator.create(LayerInfo.LAYER_STATUS);
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306 Element data = creator.create(LayerInfo.LAYER_DATA);
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307 Element timeToLive = creator.create(NODE_TTL);
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308
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309 model.setTextContent(paramType);
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310 name.setTextContent(uuid);
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311 title.setTextContent(
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312 (String) context.getContextValue(CONTEXT_LAYER_TITLE));
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313 type.setTextContent("POLYGON");
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314 status.setTextContent("OFF");
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315 data.setTextContent(POLYGON_NAME);
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316 timeToLive.setTextContent(ttl);
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317
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318 layer.appendChild(model);
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319 layer.appendChild(name);
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320 layer.appendChild(title);
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321 layer.appendChild(type);
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322 layer.appendChild(status);
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323 layer.appendChild(data);
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324 layer.appendChild(timeToLive);
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325
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326 meta.appendChild(layer);
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327 }
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328
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329
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330 /**
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331 * Append isoline layer information to meta document.
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332 *
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333 * @param context
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334 * @param document The meta document.
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335 * @param meta The element where the new information need to be appended to.
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336 * @param uuid The UUID of the current artifact.
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337 * @param paramType The parameter type (e.g. salinity).
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338 */
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339 public static void writeIsolineMeta(
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340 CallContext context,
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341 Document document,
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342 Element meta,
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343 String uuid,
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344 String paramType
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345 ) {
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346 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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347 document,
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348 ArtifactNamespaceContext.NAMESPACE_URI,
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349 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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350
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351 Long time = context.getTimeToLive();
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352 time = time != null ? time + new Date().getTime() : null;
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353 String ttl = time != null ? time.toString() : null;
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354
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355 logger.debug("Artifacts time to live: " + ttl);
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356
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357 Element layer = creator.create(LayerInfo.LAYER);
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358 Element model = creator.create(LayerInfo.LAYER_MODEL);
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359 Element name = creator.create(LayerInfo.LAYER_NAME);
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360 Element title = creator.create(LayerInfo.LAYER_TITLE);
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361 Element type = creator.create(LayerInfo.LAYER_TYPE);
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362 Element status = creator.create(LayerInfo.LAYER_STATUS);
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363 Element data = creator.create(LayerInfo.LAYER_DATA);
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364 Element timeToLive = creator.create(NODE_TTL);
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365
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366 model.setTextContent(paramType+"_isolines");
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367 name.setTextContent(uuid);
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368 title.setTextContent(
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369 (String) context.getContextValue(CONTEXT_LAYER_TITLE));
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370 type.setTextContent("LINE");
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371 status.setTextContent("OFF");
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372 data.setTextContent(ISOLINES_NAME);
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373 timeToLive.setTextContent(ttl);
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374
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375 layer.appendChild(model);
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376 layer.appendChild(name);
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377 layer.appendChild(title);
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378 layer.appendChild(type);
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379 layer.appendChild(status);
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380 layer.appendChild(data);
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381 layer.appendChild(timeToLive);
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382
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383 meta.appendChild(layer);
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384 }
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385 }
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386 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org