Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/MetaWriter.java @ 1070:7096a2e13676

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Added functionality to publish the the mbr of the generated layer to the client. gnv-artifacts/trunk@1166 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 07 Jun 2010 14:42:42 +0000
parents 04967dc9c83f
children f953c9a559d8
rev   line source
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bb0aa1f81280 Added missing class MetaWriter from last commit.
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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.text.DecimalFormat;
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9 import java.util.Date;
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10
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11 import javax.xml.xpath.XPathConstants;
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12
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13 import org.apache.log4j.Logger;
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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 com.vividsolutions.jts.geom.Envelope;
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19
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20 import de.intevation.artifactdatabase.XMLUtils;
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21 import de.intevation.artifacts.ArtifactNamespaceContext;
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22 import de.intevation.artifacts.CallContext;
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23 import de.intevation.gnv.artifacts.context.GNVArtifactContext;
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24 import de.intevation.gnv.wms.LayerInfo;
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25
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26 /**
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27 * This class provides some methods to create files storing meta information
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28 * about wms layers and a map service which serves these layers.
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29 *
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public class MetaWriter {
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33
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34 private static Logger logger = Logger.getLogger(MetaWriter.class);
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35
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36 public static final String NODE_MAPSERVER = "mapserver";
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37 public static final String NODE_SERVER = "server";
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38 public static final String NODE_MAP = "map";
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39 public static final String NODE_TTL = "ttl";
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40
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41 public static final String META_FILE_NAME = "meta.xml";
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42
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43 public static final String XPATH_META = "/art:meta";
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44 public static final String XPATH_MAPSERVER = "art:meta/art:"+NODE_MAPSERVER;
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45
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46 /**
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47 * Constructor.
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48 */
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49 private MetaWriter() {
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50 }
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51
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52
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53 /**
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54 * Just create a new document and insert the root node.
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55 *
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56 * @return the meta document with necessary root node.
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57 */
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58 public static Document initMeta() {
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59 Document meta = XMLUtils.newDocument();
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60 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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61 meta,
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62 ArtifactNamespaceContext.NAMESPACE_URI,
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63 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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64
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65 Element root = creator.create("meta");
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66 meta.appendChild(root);
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67
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68 return meta;
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69 }
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70
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71 public static boolean insertLayer(
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72 CallContext context,
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73 Document document,
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74 String name,
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75 String title,
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76 String data,
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77 String model,
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78 String type,
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79 String status
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80 ) {
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81 if (document == null) {
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82 document = initMeta();
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83 }
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84
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85 Node meta = (Node) XMLUtils.xpath(
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86 document,
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87 XPATH_META,
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88 XPathConstants.NODE,
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89 ArtifactNamespaceContext.INSTANCE);
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90
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91 if (meta == null) {
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92 logger.error("No meta node was found in the given document. "
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93 + "Cannot insert layer!");
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94 return false;
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95 }
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96
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97 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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98 document,
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99 ArtifactNamespaceContext.NAMESPACE_URI,
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100 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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101
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102 Element layerEl = creator.create(LayerInfo.LAYER);
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103 Element nameEl = creator.create(LayerInfo.LAYER_NAME);
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104 Element titleEl = creator.create(LayerInfo.LAYER_TITLE);
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105 Element dataEl = creator.create(LayerInfo.LAYER_DATA);
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106 Element modelEl = creator.create(LayerInfo.LAYER_MODEL);
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107 Element typeEl = creator.create(LayerInfo.LAYER_TYPE);
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108 Element statusEl = creator.create(LayerInfo.LAYER_STATUS);
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109
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110 modelEl.setTextContent(model);
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111 nameEl.setTextContent(name);
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112 titleEl.setTextContent(title);
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113 typeEl.setTextContent(type);
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114 statusEl.setTextContent(status);
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115 dataEl.setTextContent(data);
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116
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117 layerEl.appendChild(modelEl);
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118 layerEl.appendChild(nameEl);
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119 layerEl.appendChild(titleEl);
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120 layerEl.appendChild(dataEl);
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121 layerEl.appendChild(typeEl);
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122 layerEl.appendChild(statusEl);
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123
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124 if (logger.isDebugEnabled()) {
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125 logger.debug("--------------- WMS LAYER PARAMS ---------------");
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126 logger.debug("Name : " + name);
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127 logger.debug("Title : " + title);
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128 logger.debug("Data : " + data);
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129 logger.debug("Type : " + type);
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130 logger.debug("Model : " + model);
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131 logger.debug("Status: " + status);
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132 }
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133
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134 meta.appendChild(layerEl);
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135
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136 return true;
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137 }
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138
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139 /**
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140 * Method to write the <i>meta</i> document down to a file.
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141 *
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142 * @param path The destination of the file.
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143 * @param meta The xml document storing the meta information.
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144 */
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145 public static boolean insertMbr(Envelope mbr, String srs, Document meta) {
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146 Node mapserverNode = (Node) XMLUtils.xpath(
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147 meta,
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148 XPATH_MAPSERVER,
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149 XPathConstants.NODE,
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150 ArtifactNamespaceContext.INSTANCE);
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151 if (mapserverNode != null){
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152 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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153 meta,
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154 ArtifactNamespaceContext.NAMESPACE_URI,
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155 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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156 Element bboxNode = creator.create("Box");
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157 bboxNode.setAttribute("srsName", srs);
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158 Element coordinateNode = creator.create("coordinates");
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159
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160 DecimalFormat formatter = new DecimalFormat("###.############");
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161 coordinateNode.setTextContent(formatter.format(mbr.getMinX()).replace(',', '.') +","+
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162 formatter.format(mbr.getMinY()).replace(',', '.')+" "+
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163 formatter.format(mbr.getMaxX()).replace(',', '.') +","+
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164 formatter.format(mbr.getMaxY()).replace(',', '.'));
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165 mapserverNode.appendChild(bboxNode);
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166 bboxNode.appendChild(coordinateNode);
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167 }
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168 return true;
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169 }
655
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170 /**
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171 * Method to write the <i>meta</i> document down to a file.
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172 *
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173 * @param path The destination of the file.
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174 * @param meta The xml document storing the meta information.
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175 */
859
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176 public static boolean writeMetaFile(String path, Document meta) {
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177 try {
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178 File metaFile = new File(path, META_FILE_NAME);
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179
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180 if (metaFile.exists()) {
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181 logger.info("Delete old meta information file.");
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182 metaFile.delete();
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183 }
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184
647
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185 if (!metaFile.createNewFile() || !metaFile.canWrite()) {
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186 logger.error("Error while writing meta file: "+metaFile.toString());
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187 return false;
647
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188 }
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189
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190 OutputStream out = null;
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191 boolean success = false;
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192 try {
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193 out = new FileOutputStream(metaFile);
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194 success = XMLUtils.toStream(meta, out);
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195 }
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196 finally {
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197 if (out != null) {
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198 try { out.close(); }
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199 catch (IOException ioe) {}
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200 }
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201 }
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202
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203 if (!success && metaFile.exists()) {
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204 metaFile.delete();
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205 }
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206
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207 return success;
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208 }
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209 catch (FileNotFoundException fnfe) {
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210 logger.error(fnfe);
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211 return false;
647
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212 }
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213 catch (IOException ioe) {
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214 logger.error(ioe, ioe);
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215 return false;
647
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216 }
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217 }
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218
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219
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220 /**
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221 * Append meta information about the mapservice itself.
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222 *
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223 * @param callContext The CallContext object.
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224 * @param document The meta information document.
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225 * @param meta The element where the new information need to be appended to.
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226 */
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227 public static void insertAbstractMeta(
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228 CallContext callContext,
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229 Document document
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230 ) {
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231 if (document == null) {
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232 document = initMeta();
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233 }
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234
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235 Node meta = (Node) XMLUtils.xpath(
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236 document,
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237 XPATH_META,
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238 XPathConstants.NODE,
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239 ArtifactNamespaceContext.INSTANCE);
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240
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241 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
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242 document,
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243 ArtifactNamespaceContext.NAMESPACE_URI,
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244 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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245
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246 GNVArtifactContext context =
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247 (GNVArtifactContext) callContext.globalContext();
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248
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249 String server = (String)
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250 context.get(GNVArtifactContext.MAPSERVER_SERVER_PATH_KEY);
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251
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252 String map = (String)
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253 context.get(GNVArtifactContext.MAPSERVER_MAP_PATH_KEY);
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254
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255 Long time = callContext.getTimeToLive();
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256 time = time != null ? time + new Date().getTime() : null;
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257 String ttl = time != null ? time.toString() : null;
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258
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259 if (logger.isDebugEnabled()) {
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260 logger.debug("MAPSERVER PATH: " + server);
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261 logger.debug("MAP PATH: " + map);
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262 logger.debug("TTL: " + ttl);
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263 }
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264
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265 Element mapserver = creator.create(NODE_MAPSERVER);
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266 Element serverPath = creator.create(NODE_SERVER);
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267 Element mapPath = creator.create(NODE_MAP);
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268 Element timetolive = creator.create(NODE_TTL);
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269
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270 mapPath.setTextContent(map);
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271 serverPath.setTextContent(server);
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272 timetolive.setTextContent(ttl);
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273
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274 mapserver.appendChild(serverPath);
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275 mapserver.appendChild(mapPath);
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276 mapserver.appendChild(timetolive);
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277 meta.appendChild(mapserver);
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278 }
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279 }
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280 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org