Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/MetaWriter.java @ 1057:04967dc9c83f

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The title of a layer can be changed by the user. Product 'Layer' and 'Horizontalschnitt' now use the same code path to write the meta information file. (issue198) gnv-artifacts/trunk@1134 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 27 May 2010 16:43:00 +0000
parents dfd02f8d3602
children 7096a2e13676
rev   line source
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1 package de.intevation.gnv.utils;
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2
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3 import java.io.File;
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4 import java.io.FileNotFoundException;
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5 import java.io.FileOutputStream;
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6 import java.io.IOException;
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7 import java.io.OutputStream;
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8 import java.util.Date;
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9
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10 import javax.xml.xpath.XPathConstants;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import org.w3c.dom.Document;
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15 import org.w3c.dom.Element;
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16 import org.w3c.dom.Node;
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17
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18 import de.intevation.artifactdatabase.XMLUtils;
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19 import de.intevation.artifacts.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.CallContext;
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21 import de.intevation.gnv.artifacts.context.GNVArtifactContext;
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22 import de.intevation.gnv.wms.LayerInfo;
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23
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24 /**
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25 * This class provides some methods to create files storing meta information
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26 * about wms layers and a map service which serves these layers.
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27 *
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public class MetaWriter {
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31
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32 private static Logger logger = Logger.getLogger(MetaWriter.class);
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33
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34 public static final String NODE_MAPSERVER = "mapserver";
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35 public static final String NODE_SERVER = "server";
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36 public static final String NODE_MAP = "map";
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37 public static final String NODE_TTL = "ttl";
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38
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39 public static final String META_FILE_NAME = "meta.xml";
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40
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41 public static final String XPATH_META = "/art:meta";
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42
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43 /**
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44 * Constructor.
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45 */
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46 private MetaWriter() {
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47 }
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48
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49
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50 /**
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51 * Just create a new document and insert the root node.
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52 *
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53 * @return the meta document with necessary root node.
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54 */
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55 public static Document initMeta() {
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56 Document meta = XMLUtils.newDocument();
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57 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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58 meta,
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59 ArtifactNamespaceContext.NAMESPACE_URI,
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60 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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61
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62 Element root = creator.create("meta");
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63 meta.appendChild(root);
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64
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65 return meta;
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66 }
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67
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68 public static boolean insertLayer(
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69 CallContext context,
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70 Document document,
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71 String name,
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72 String title,
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73 String data,
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74 String model,
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75 String type,
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76 String status
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77 ) {
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78 if (document == null) {
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79 document = initMeta();
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80 }
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81
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82 Node meta = (Node) XMLUtils.xpath(
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83 document,
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84 XPATH_META,
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85 XPathConstants.NODE,
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86 ArtifactNamespaceContext.INSTANCE);
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87
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88 if (meta == null) {
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89 logger.error("No meta node was found in the given document. "
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90 + "Cannot insert layer!");
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91 return false;
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92 }
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93
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94 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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95 document,
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96 ArtifactNamespaceContext.NAMESPACE_URI,
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97 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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98
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99 Element layerEl = creator.create(LayerInfo.LAYER);
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100 Element nameEl = creator.create(LayerInfo.LAYER_NAME);
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101 Element titleEl = creator.create(LayerInfo.LAYER_TITLE);
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102 Element dataEl = creator.create(LayerInfo.LAYER_DATA);
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103 Element modelEl = creator.create(LayerInfo.LAYER_MODEL);
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104 Element typeEl = creator.create(LayerInfo.LAYER_TYPE);
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105 Element statusEl = creator.create(LayerInfo.LAYER_STATUS);
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106
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107 modelEl.setTextContent(model);
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108 nameEl.setTextContent(name);
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109 titleEl.setTextContent(title);
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110 typeEl.setTextContent(type);
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111 statusEl.setTextContent(status);
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112 dataEl.setTextContent(data);
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113
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114 layerEl.appendChild(modelEl);
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115 layerEl.appendChild(nameEl);
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116 layerEl.appendChild(titleEl);
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117 layerEl.appendChild(dataEl);
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118 layerEl.appendChild(typeEl);
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119 layerEl.appendChild(statusEl);
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120
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121 if (logger.isDebugEnabled()) {
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122 logger.debug("--------------- WMS LAYER PARAMS ---------------");
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123 logger.debug("Name : " + name);
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124 logger.debug("Title : " + title);
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125 logger.debug("Data : " + data);
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126 logger.debug("Type : " + type);
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127 logger.debug("Model : " + model);
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128 logger.debug("Status: " + status);
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129 }
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130
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131 meta.appendChild(layerEl);
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132
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133 return true;
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134 }
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135
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136
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137 /**
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138 * Method to write the <i>meta</i> document down to a file.
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139 *
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140 * @param path The destination of the file.
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141 * @param meta The xml document storing the meta information.
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142 */
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143 public static boolean writeMetaFile(String path, Document meta) {
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144 try {
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145 File metaFile = new File(path, META_FILE_NAME);
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146
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147 if (metaFile.exists()) {
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148 logger.info("Delete old meta information file.");
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149 metaFile.delete();
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150 }
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151
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152 if (!metaFile.createNewFile() || !metaFile.canWrite()) {
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153 logger.error("Error while writing meta file: "+metaFile.toString());
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154 return false;
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155 }
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156
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157 OutputStream out = null;
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158 boolean success = false;
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159 try {
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160 out = new FileOutputStream(metaFile);
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161 success = XMLUtils.toStream(meta, out);
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162 }
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163 finally {
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164 if (out != null) {
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165 try { out.close(); }
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166 catch (IOException ioe) {}
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167 }
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168 }
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169
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170 if (!success && metaFile.exists()) {
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171 metaFile.delete();
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172 }
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173
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174 return success;
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175 }
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176 catch (FileNotFoundException fnfe) {
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177 logger.error(fnfe);
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178 return false;
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179 }
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180 catch (IOException ioe) {
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181 logger.error(ioe, ioe);
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182 return false;
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183 }
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184 }
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185
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186
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187 /**
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188 * Append meta information about the mapservice itself.
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189 *
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190 * @param callContext The CallContext object.
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191 * @param document The meta information document.
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192 * @param meta The element where the new information need to be appended to.
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193 */
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194 public static void insertAbstractMeta(
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195 CallContext callContext,
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196 Document document
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197 ) {
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198 if (document == null) {
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199 document = initMeta();
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200 }
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201
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202 Node meta = (Node) XMLUtils.xpath(
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203 document,
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204 XPATH_META,
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205 XPathConstants.NODE,
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206 ArtifactNamespaceContext.INSTANCE);
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207
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208 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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209 document,
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210 ArtifactNamespaceContext.NAMESPACE_URI,
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211 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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212
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213 GNVArtifactContext context =
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214 (GNVArtifactContext) callContext.globalContext();
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215
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216 String server = (String)
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217 context.get(GNVArtifactContext.MAPSERVER_SERVER_PATH_KEY);
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218
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219 String map = (String)
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220 context.get(GNVArtifactContext.MAPSERVER_MAP_PATH_KEY);
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221
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222 Long time = callContext.getTimeToLive();
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223 time = time != null ? time + new Date().getTime() : null;
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224 String ttl = time != null ? time.toString() : null;
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225
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226 if (logger.isDebugEnabled()) {
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227 logger.debug("MAPSERVER PATH: " + server);
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228 logger.debug("MAP PATH: " + map);
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229 logger.debug("TTL: " + ttl);
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230 }
647
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231
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232 Element mapserver = creator.create(NODE_MAPSERVER);
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233 Element serverPath = creator.create(NODE_SERVER);
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234 Element mapPath = creator.create(NODE_MAP);
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235 Element timetolive = creator.create(NODE_TTL);
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236
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237 mapPath.setTextContent(map);
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238 serverPath.setTextContent(server);
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239 timetolive.setTextContent(ttl);
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240
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241 mapserver.appendChild(serverPath);
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242 mapserver.appendChild(mapPath);
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243 mapserver.appendChild(timetolive);
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244 meta.appendChild(mapserver);
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245 }
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246 }
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247 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org