Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/MetaWriter.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents dec4257ad570
children
rev   line source
1115
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.utils;
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10
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11 import java.io.File;
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12 import java.io.FileNotFoundException;
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13 import java.io.FileOutputStream;
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14 import java.io.IOException;
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15 import java.io.OutputStream;
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16 import java.text.DecimalFormat;
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17 import java.util.Date;
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18
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19 import javax.xml.xpath.XPathConstants;
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20
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21 import org.apache.log4j.Logger;
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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 import org.w3c.dom.Node;
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25
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26 import com.vividsolutions.jts.geom.Envelope;
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27
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28 import de.intevation.artifacts.common.utils.XMLUtils;
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29 import de.intevation.artifacts.ArtifactNamespaceContext;
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30 import de.intevation.artifacts.CallContext;
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31 import de.intevation.gnv.artifacts.context.GNVArtifactContext;
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32 import de.intevation.gnv.wms.LayerInfo;
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33
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34 /**
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35 * This class provides some methods to create files storing meta information
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36 * about wms layers and a map service which serves these layers.
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37 *
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38 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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39 */
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40 public class MetaWriter {
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41
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42 private static Logger logger = Logger.getLogger(MetaWriter.class);
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43
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44 public static final String NODE_MAPSERVER = "mapserver";
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45 public static final String NODE_SERVER = "server";
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46 public static final String NODE_MAP = "map";
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47 public static final String NODE_TTL = "ttl";
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48
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49 public static final String META_FILE_NAME = "meta.xml";
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50
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51 public static final String XPATH_META = "/art:meta";
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52 public static final String XPATH_MAPSERVER = "art:meta/art:"+NODE_MAPSERVER;
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53
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54 /**
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55 * Constructor.
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56 */
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57 private MetaWriter() {
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58 }
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59
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60
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61 /**
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62 * Just create a new document and insert the root node.
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63 *
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64 * @return the meta document with necessary root node.
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65 */
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66 public static Document initMeta() {
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67 Document meta = XMLUtils.newDocument();
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68 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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69 meta,
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70 ArtifactNamespaceContext.NAMESPACE_URI,
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71 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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72
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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 return meta;
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77 }
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78
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79 public static boolean insertLayer(
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80 CallContext context,
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81 Document document,
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82 String name,
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83 String title,
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84 String data,
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85 String model,
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86 String type,
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87 String status
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88 ) {
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89 if (document == null) {
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90 document = initMeta();
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91 }
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92
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93 Node meta = (Node) XMLUtils.xpath(
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94 document,
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95 XPATH_META,
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96 XPathConstants.NODE,
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97 ArtifactNamespaceContext.INSTANCE);
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98
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99 if (meta == null) {
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100 logger.error("No meta node was found in the given document. "
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101 + "Cannot insert layer!");
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102 return false;
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103 }
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104
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105 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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106 document,
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107 ArtifactNamespaceContext.NAMESPACE_URI,
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108 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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109
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110 Element layerEl = creator.create(LayerInfo.LAYER);
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111 Element nameEl = creator.create(LayerInfo.LAYER_NAME);
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112 Element titleEl = creator.create(LayerInfo.LAYER_TITLE);
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113 Element dataEl = creator.create(LayerInfo.LAYER_DATA);
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114 Element modelEl = creator.create(LayerInfo.LAYER_MODEL);
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115 Element typeEl = creator.create(LayerInfo.LAYER_TYPE);
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116 Element statusEl = creator.create(LayerInfo.LAYER_STATUS);
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117
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118 modelEl.setTextContent(model);
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119 nameEl.setTextContent(name);
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120 titleEl.setTextContent(title);
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121 typeEl.setTextContent(type);
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122 statusEl.setTextContent(status);
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123 dataEl.setTextContent(data);
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124
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125 layerEl.appendChild(modelEl);
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126 layerEl.appendChild(nameEl);
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127 layerEl.appendChild(titleEl);
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128 layerEl.appendChild(dataEl);
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129 layerEl.appendChild(typeEl);
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130 layerEl.appendChild(statusEl);
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131
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132 if (logger.isDebugEnabled()) {
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133 logger.debug("--------------- WMS LAYER PARAMS ---------------");
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134 logger.debug("Name : " + name);
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135 logger.debug("Title : " + title);
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136 logger.debug("Data : " + data);
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137 logger.debug("Type : " + type);
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138 logger.debug("Model : " + model);
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139 logger.debug("Status: " + status);
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140 }
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141
04967dc9c83f 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)
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142 meta.appendChild(layerEl);
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143
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144 return true;
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145 }
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146
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147 /**
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148 * Method to write the <i>meta</i> document down to a file.
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149 *
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150 * @param path The destination of the file.
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151 * @param meta The xml document storing the meta information.
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152 */
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153 public static boolean insertMbr(Envelope mbr, String srs, Document meta) {
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154 Node mapserverNode = (Node) XMLUtils.xpath(
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155 meta,
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156 XPATH_MAPSERVER,
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157 XPathConstants.NODE,
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158 ArtifactNamespaceContext.INSTANCE);
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159 if (mapserverNode != null){
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160 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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161 meta,
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162 ArtifactNamespaceContext.NAMESPACE_URI,
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diff changeset
163 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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164 Element bboxNode = creator.create("Box");
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165 bboxNode.setAttribute("srsName", srs);
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166 Element coordinateNode = creator.create("coordinates");
1057
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167
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168 DecimalFormat formatter = new DecimalFormat("###.############");
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169 coordinateNode.setTextContent(formatter.format(mbr.getMinX()).replace(',', '.') +","+
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170 formatter.format(mbr.getMinY()).replace(',', '.')+" "+
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171 formatter.format(mbr.getMaxX()).replace(',', '.') +","+
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172 formatter.format(mbr.getMaxY()).replace(',', '.'));
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173 mapserverNode.appendChild(bboxNode);
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174 bboxNode.appendChild(coordinateNode);
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175 }
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176 return true;
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177 }
655
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178 /**
806
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179 * Method to write the <i>meta</i> document down to a file.
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180 *
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181 * @param path The destination of the file.
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182 * @param meta The xml document storing the meta information.
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183 */
859
3fbabd4803d7 ISSUE252 Make it possible to export more than one Layer
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184 public static boolean writeMetaFile(String path, Document meta) {
647
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185 try {
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186 File metaFile = new File(path, META_FILE_NAME);
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187
730
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188 if (metaFile.exists()) {
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189 logger.info("Delete old meta information file.");
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190 metaFile.delete();
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191 }
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192
647
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193 if (!metaFile.createNewFile() || !metaFile.canWrite()) {
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194 logger.error("Error while writing meta file: "+metaFile.toString());
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195 return false;
647
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196 }
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197
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198 OutputStream out = null;
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199 boolean success = false;
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200 try {
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201 out = new FileOutputStream(metaFile);
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202 success = XMLUtils.toStream(meta, out);
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203 }
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204 finally {
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205 if (out != null) {
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206 try { out.close(); }
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207 catch (IOException ioe) {}
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208 }
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209 }
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210
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211 if (!success && metaFile.exists()) {
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212 metaFile.delete();
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213 }
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214
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215 return success;
647
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216 }
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217 catch (FileNotFoundException fnfe) {
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218 logger.error(fnfe);
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219 return false;
647
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220 }
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221 catch (IOException ioe) {
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222 logger.error(ioe, ioe);
655
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223 return false;
647
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224 }
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225 }
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226
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227
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228 /**
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229 * Append meta information about the mapservice itself.
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230 *
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231 * @param callContext The CallContext object.
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232 * @param document The meta information document.
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233 * @param meta The element where the new information need to be appended to.
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234 */
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235 public static void insertAbstractMeta(
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236 CallContext callContext,
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237 Document document
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238 ) {
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239 if (document == null) {
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240 document = initMeta();
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241 }
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242
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243 Node meta = (Node) XMLUtils.xpath(
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244 document,
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245 XPATH_META,
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246 XPathConstants.NODE,
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247 ArtifactNamespaceContext.INSTANCE);
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248
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249 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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250 document,
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251 ArtifactNamespaceContext.NAMESPACE_URI,
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252 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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253
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254 GNVArtifactContext context =
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255 (GNVArtifactContext) callContext.globalContext();
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256
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257 String server = (String)
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258 context.get(GNVArtifactContext.MAPSERVER_SERVER_PATH_KEY);
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259
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260 String map = (String)
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261 context.get(GNVArtifactContext.MAPSERVER_MAP_PATH_KEY);
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262
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263 Long time = callContext.getTimeToLive();
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264 time = time != null ? time + new Date().getTime() : null;
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265 String ttl = time != null ? time.toString() : null;
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266
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267 if (logger.isDebugEnabled()) {
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268 logger.debug("MAPSERVER PATH: " + server);
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269 logger.debug("MAP PATH: " + map);
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270 logger.debug("TTL: " + ttl);
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271 }
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272
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273 Element mapserver = creator.create(NODE_MAPSERVER);
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274 Element serverPath = creator.create(NODE_SERVER);
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275 Element mapPath = creator.create(NODE_MAP);
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276 Element timetolive = creator.create(NODE_TTL);
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277
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278 mapPath.setTextContent(map);
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279 serverPath.setTextContent(server);
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280 timetolive.setTextContent(ttl);
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281
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282 mapserver.appendChild(serverPath);
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283 mapserver.appendChild(mapPath);
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284 mapserver.appendChild(timetolive);
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285 meta.appendChild(mapserver);
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286 }
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287 }
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288 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org