Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/MetaWriter.java @ 1030:c07d9f9a738c

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Removed bugs that existed in the caching mechanism (issue264, issue268). gnv-artifacts/trunk@1067 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 06 May 2010 08:32:56 +0000
parents dfd02f8d3602
children 04967dc9c83f
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 org.apache.log4j.Logger;
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11 import org.w3c.dom.Document;
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12 import org.w3c.dom.Element;
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13 import org.w3c.dom.Node;
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14
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15 import de.intevation.artifactdatabase.XMLUtils;
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16 import de.intevation.artifacts.ArtifactNamespaceContext;
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17 import de.intevation.artifacts.CallContext;
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18 import de.intevation.gnv.artifacts.context.GNVArtifactContext;
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19 import de.intevation.gnv.wms.LayerInfo;
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20
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21 /**
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22 * This class provides some methods to create files storing meta information
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23 * about wms layers and a map service which serves these layers.
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24 *
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25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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26 */
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27 public class MetaWriter {
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28
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29 private static Logger logger = Logger.getLogger(MetaWriter.class);
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30
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31 public static final String NODE_MAPSERVER = "mapserver";
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32 public static final String NODE_SERVER = "server";
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33 public static final String NODE_MAP = "map";
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34 public static final String NODE_TTL = "ttl";
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35
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36 public static final String META_FILE_NAME = "meta.xml";
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37 public static final String ISOLINES_NAME = "isolines.shp";
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38 public static final String POLYGON_NAME = "polygons.shp";
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39
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40
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41 public static final String CONTEXT_LAYER_TITLE = "wms.title";
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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 * Writes a meta information file for product type 'Layer'.
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51 *
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52 * @param context CallContext object.
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53 * @param meta the document where the information should be placed in.
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54 * @return the meta document.
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55 */
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56 public static Node writeLayerMeta(CallContext context, Document meta){
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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 Element root = creator.create("meta");
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62 meta.appendChild(root);
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63
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64 writeAbstractMeta(context, meta, root);
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65 return root;
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66 }
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67
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68
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69 /**
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70 * Writes a meta information file for product type 'Horizontalschnitt'.
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71 *
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72 * @param context The CallContext object.
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73 * @param uuid The UUID of the current artifact.
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74 * @param path The destination of the meta file.
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75 * @param paramType The parameter type.
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76 * @return the meta document.
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77 */
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78 public static Document writeHorizontalcrosssectionMeta(
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79 CallContext context,
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80 String uuid,
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81 String path,
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82 String paramType)
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83 {
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84 Document meta = XMLUtils.newDocument();
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85 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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86 meta,
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87 ArtifactNamespaceContext.NAMESPACE_URI,
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88 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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89
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90 Element root = creator.create("meta");
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91 meta.appendChild(root);
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92
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93 writeAbstractMeta(context, meta, root);
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94 writePolygonMeta(context, meta, root, uuid, paramType);
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95 writeIsolineMeta(context, meta, root, uuid, paramType);
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96
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97 boolean success = writeMetaFile(path, meta);
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98
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99 if (success){
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100 return meta;
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101 }else{
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102 return null;
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103 }
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104 }
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105
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106 /**
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107 * Method to write the <i>meta</i> document down to a file.
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108 *
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109 * @param path The destination of the file.
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110 * @param meta The xml document storing the meta information.
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111 */
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112 public static boolean writeMetaFile(String path, Document meta) {
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113 try {
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114 File metaFile = new File(path, META_FILE_NAME);
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115
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116 if (metaFile.exists()) {
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117 logger.info("Delete old meta information file.");
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118 metaFile.delete();
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119 }
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120
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121 if (!metaFile.createNewFile() || !metaFile.canWrite()) {
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122 logger.error("Error while writing meta file: "+metaFile.toString());
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123 return false;
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124 }
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125
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126 OutputStream out = null;
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127 boolean success = false;
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128 try {
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129 out = new FileOutputStream(metaFile);
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130 success = XMLUtils.toStream(meta, out);
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131 }
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132 finally {
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133 if (out != null) {
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134 try { out.close(); }
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135 catch (IOException ioe) {}
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136 }
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137 }
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138
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139 if (!success && metaFile.exists()) {
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140 metaFile.delete();
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141 }
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142
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143 return success;
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144 }
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145 catch (FileNotFoundException fnfe) {
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146 logger.error(fnfe);
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147 return false;
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148 }
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149 catch (IOException ioe) {
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150 logger.error(ioe, ioe);
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151 return false;
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152 }
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153 }
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154
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155
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156 /**
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157 * Append meta information about the mapservice itself.
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158 *
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159 * @param callContext The CallContext object.
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160 * @param document The meta information document.
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161 * @param meta The element where the new information need to be appended to.
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162 */
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163 public static void writeAbstractMeta(
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164 CallContext callContext,
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165 Document document,
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166 Element meta
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167 ) {
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168 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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169 document,
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170 ArtifactNamespaceContext.NAMESPACE_URI,
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171 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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172
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173 GNVArtifactContext context =
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174 (GNVArtifactContext) callContext.globalContext();
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175
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176 String server = (String)
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177 context.get(GNVArtifactContext.MAPSERVER_SERVER_PATH_KEY);
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178
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179 String map = (String)
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180 context.get(GNVArtifactContext.MAPSERVER_MAP_PATH_KEY);
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181
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182 if (logger.isDebugEnabled()) {
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183 logger.debug("MAPSERVER PATH: " + server);
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184 logger.debug("MAP PATH: " + map);
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185 }
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186
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187 Element mapserver = creator.create(NODE_MAPSERVER);
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188 Element serverPath = creator.create(NODE_SERVER);
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189 Element mapPath = creator.create(NODE_MAP);
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190
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191 mapPath.setTextContent(map);
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192 serverPath.setTextContent(server);
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193
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194 mapserver.appendChild(serverPath);
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195 mapserver.appendChild(mapPath);
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196 meta.appendChild(mapserver);
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197 }
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198
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199 /**
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200 * Append layer information to the meta document.
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201 *
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202 * @param callContext The CallContext object.
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203 * @param document The meta document.
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204 * @param root The element where the new information need to be appended to.
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205 * @param uuid The UUID of the current artifact.
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206 * @param paramType The parameter type (e.g. salinity).
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207 * @param layerType The layer type.
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208 * @param shapefileName the name of the Shapefile
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209 * @param shapefileName the Title of the Layer
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210 */
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211 public static void writeLayerMeta(
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212 CallContext callContext,
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213 Document document,
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214 Node root,
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215 String uuid,
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216 String paramType,
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217 String layerType,
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218 String shapefileName,
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219 String layerTitle
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220 ) {
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221 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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222 document,
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223 ArtifactNamespaceContext.NAMESPACE_URI,
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224 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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225
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226 Long time = callContext.getTimeToLive();
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227 time = time != null ? time + new Date().getTime() : null;
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228 String ttl = time != null ? time.toString() : null;
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229
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230 logger.debug("Artifacts time to live: " + ttl);
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231
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232 Element layer = creator.create(LayerInfo.LAYER);
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233 Element model = creator.create(LayerInfo.LAYER_MODEL);
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234 Element name = creator.create(LayerInfo.LAYER_NAME);
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235 Element title = creator.create(LayerInfo.LAYER_TITLE);
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236 Element type = creator.create(LayerInfo.LAYER_TYPE);
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237 Element status = creator.create(LayerInfo.LAYER_STATUS);
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238 Element data = creator.create(LayerInfo.LAYER_DATA);
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239 Element timeToLive = creator.create(NODE_TTL);
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240
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241 model.setTextContent(paramType);
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242 name.setTextContent(uuid);
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243 type.setTextContent(layerType);
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244 status.setTextContent("OFF");
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245 data.setTextContent(shapefileName);
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246 timeToLive.setTextContent(ttl);
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247
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248 title.setTextContent(layerTitle);
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249
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250 layer.appendChild(model);
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251 layer.appendChild(name);
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252 layer.appendChild(title);
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253 layer.appendChild(type);
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254 layer.appendChild(status);
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255 layer.appendChild(data);
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256 layer.appendChild(timeToLive);
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257
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258 root.appendChild(layer);
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259 }
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260
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261
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262 /**
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263 * Append polygon layer information to meta document.
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264 *
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265 * @param context
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266 * @param document The meta document.
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267 * @param meta The element where the new information need to be appended to.
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268 * @param uuid The UUID of the current artifact.
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269 * @param paramType The parameter type (e.g. salinity).
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270 */
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271 public static void writePolygonMeta(
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272 CallContext context,
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273 Document document,
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274 Element meta,
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275 String uuid,
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276 String paramType
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277 ) {
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278 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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279 document,
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280 ArtifactNamespaceContext.NAMESPACE_URI,
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281 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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282
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283 Long time = context.getTimeToLive();
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284 time = time != null ? time + new Date().getTime() : null;
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285 String ttl = time != null ? time.toString() : null;
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286
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287 logger.debug("Artifacts time to live: " + ttl);
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288
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289 Element layer = creator.create(LayerInfo.LAYER);
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290 Element model = creator.create(LayerInfo.LAYER_MODEL);
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291 Element name = creator.create(LayerInfo.LAYER_NAME);
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292 Element title = creator.create(LayerInfo.LAYER_TITLE);
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293 Element type = creator.create(LayerInfo.LAYER_TYPE);
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294 Element status = creator.create(LayerInfo.LAYER_STATUS);
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295 Element data = creator.create(LayerInfo.LAYER_DATA);
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296 Element timeToLive = creator.create(NODE_TTL);
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297
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298 model.setTextContent(paramType);
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299 name.setTextContent(uuid);
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300 title.setTextContent(
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301 (String) context.getContextValue(CONTEXT_LAYER_TITLE));
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302 type.setTextContent("POLYGON");
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303 status.setTextContent("OFF");
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304 data.setTextContent(POLYGON_NAME);
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305 timeToLive.setTextContent(ttl);
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306
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307 layer.appendChild(model);
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308 layer.appendChild(name);
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309 layer.appendChild(title);
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310 layer.appendChild(type);
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311 layer.appendChild(status);
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312 layer.appendChild(data);
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313 layer.appendChild(timeToLive);
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314
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315 meta.appendChild(layer);
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316 }
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317
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318
806
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319 /**
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320 * Append isoline layer information to meta document.
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321 *
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322 * @param context
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323 * @param document The meta document.
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324 * @param meta The element where the new information need to be appended to.
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325 * @param uuid The UUID of the current artifact.
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326 * @param paramType The parameter type (e.g. salinity).
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327 */
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328 public static void writeIsolineMeta(
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329 CallContext context,
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330 Document document,
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331 Element meta,
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332 String uuid,
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333 String paramType
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334 ) {
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335 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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336 document,
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337 ArtifactNamespaceContext.NAMESPACE_URI,
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338 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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339
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340 Long time = context.getTimeToLive();
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341 time = time != null ? time + new Date().getTime() : null;
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342 String ttl = time != null ? time.toString() : null;
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343
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344 logger.debug("Artifacts time to live: " + ttl);
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345
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346 Element layer = creator.create(LayerInfo.LAYER);
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347 Element model = creator.create(LayerInfo.LAYER_MODEL);
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348 Element name = creator.create(LayerInfo.LAYER_NAME);
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349 Element title = creator.create(LayerInfo.LAYER_TITLE);
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350 Element type = creator.create(LayerInfo.LAYER_TYPE);
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351 Element status = creator.create(LayerInfo.LAYER_STATUS);
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352 Element data = creator.create(LayerInfo.LAYER_DATA);
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353 Element timeToLive = creator.create(NODE_TTL);
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354
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355 model.setTextContent(paramType+"_isolines");
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356 name.setTextContent(uuid);
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357 title.setTextContent(
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358 (String) context.getContextValue(CONTEXT_LAYER_TITLE));
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359 type.setTextContent("LINE");
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360 status.setTextContent("OFF");
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361 data.setTextContent(ISOLINES_NAME);
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362 timeToLive.setTextContent(ttl);
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363
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364 layer.appendChild(model);
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365 layer.appendChild(name);
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366 layer.appendChild(title);
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367 layer.appendChild(type);
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368 layer.appendChild(status);
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369 layer.appendChild(data);
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370 layer.appendChild(timeToLive);
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371
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372 meta.appendChild(layer);
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373 }
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374 }
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375 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org