Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 164:268c2972d4a7

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Implemented the interface method listCollections() in the artifact database. artifacts/trunk@1389 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 03 Mar 2011 14:28:02 +0000
parents 933bbc9fc11f
children
rev   line source
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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.artifactdatabase;
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10
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11 import java.io.File;
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12 import java.io.IOException;
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13
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14 import javax.xml.namespace.QName;
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16 import javax.xml.parsers.DocumentBuilderFactory;
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17 import javax.xml.parsers.ParserConfigurationException;
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18
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19 import javax.xml.xpath.XPathConstants;
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21 import org.apache.log4j.Logger;
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23 import org.w3c.dom.Document;
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24 import org.w3c.dom.Node;
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25 import org.w3c.dom.NodeList;
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26
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27 import org.xml.sax.SAXException;
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28
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29 /**
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30 * The central access to the configuration of the artifact database.
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31 * This class provides some static methods to access the central
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32 * configuration XML file via XPath.
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33 *
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34 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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35 */
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36 public final class Config
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37 {
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38 private static Logger logger = Logger.getLogger(Config.class);
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40 /**
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41 * System property name where to find the configuration directory.
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42 */
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43 public static final String CONFIG_DIR = "artifact.database.dir";
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45 /**
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46 * Default path to the configuration directory if none
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47 * was specified by the CONFIG_DIR system property.
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48 */
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49 public static final File CONFIG_DIR_DEFAULT =
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50 new File(new File(System.getProperty("user.home",
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51 System.getProperty("user.dir", "."))), ".artifactdb");
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53 /**
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54 * Name of the central configuration XML file.
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55 */
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56 public static final String CONFIG_FILE = "conf.xml";
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58 /**
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59 * Name of the configuration filename alias to be use
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60 * within the configuration. This alias is replaced by
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61 * the real path.
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62 */
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63 public static final String CONFIG_DIR_PLACEHOLDER =
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64 "${artifacts.config.dir}";
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66 private static Document config;
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68 private Config() {
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69 }
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71 /**
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72 * Singleton access to the central XML configuration document.
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73 * @return The central XML configuration document.
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74 */
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75 public static synchronized final Document getConfig() {
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76 if (config == null) {
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77 config = loadConfig();
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78 }
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79 return config;
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80 }
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82 /**
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83 * Returns the path to the configuartion directory. If a path
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84 * was specified via the CONFIG_DIR system property this one
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85 * is used. Else it falls back to default configuration path.
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86 * @return The path to the configuartion directory.
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87 */
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88 public static File getConfigDirectory() {
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89 String configDirString = System.getProperty(CONFIG_DIR);
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90
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91 File configDir = configDirString != null
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92 ? new File(configDirString)
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93 : CONFIG_DIR_DEFAULT;
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94
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95 if (!configDir.isDirectory()) {
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96 logger.warn("'" + configDir + "' is not a directory.");
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97 configDir = CONFIG_DIR_DEFAULT;
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98 }
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99
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100 return configDir;
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101 }
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103 /**
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104 * Replaces the CONFIG_DIR_PLACEHOLDER alias with the real path
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105 * of the configuration directory.
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106 * @param path The path containing the CONFIG_DIR_PLACEHOLDER placeholder.
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107 * @return The path where the CONFIG_DIR_PLACEHOLDER placeholders are
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108 * replaced by the real path name.
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109 */
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110 public static String replaceConfigDir(String path) {
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111 String configDir = getConfigDirectory().getAbsolutePath();
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112 return path.replace(CONFIG_DIR_PLACEHOLDER, configDir);
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113 }
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114
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115 private static Document loadConfig() {
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116
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117 File configDir = getConfigDirectory();
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118
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119 File file = new File(configDir, CONFIG_FILE);
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120
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121 if (!file.canRead() && !file.isFile()) {
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122 logger.error("Cannot read config file '"
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123 + file + "'.");
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124 return null;
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125 }
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126
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127 try {
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128 DocumentBuilderFactory factory =
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129 DocumentBuilderFactory.newInstance();
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130 factory.setValidating(false); // XXX: This may change in future.
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131 return factory.newDocumentBuilder().parse(file);
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132 }
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133 catch (SAXException se) {
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134 logger.error(se.getLocalizedMessage(), se);
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135 }
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136 catch (ParserConfigurationException pce) {
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137 logger.error(pce.getLocalizedMessage(), pce);
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138 }
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139 catch (IOException ioe) {
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140 logger.error(ioe.getLocalizedMessage());
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141 }
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142
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143 return null;
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144 }
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145
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146 /**
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147 * Convenience method to search within a given document tree via XPath.
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148 * See {@link XMLUtils#xpath(Object, String, QName) } for details.
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149 * @param root The object which is used as the root of the tree to
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150 * be searched in.
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151 * @param query The XPath query.
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152 * @param returnType The type of the result.
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153 * @return The result of type 'returnTyp' or null if something went
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154 * wrong during XPath evaluation.
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155 */
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156 public static final Object getXPath(
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157 Object root, String query, QName returnType
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158 ) {
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159 return XMLUtils.xpath(root, query, returnType);
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160 }
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161
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162 /**
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163 * Convenience method to search within the central configuration via XPath.
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164 * See {@link XMLUtils#xpath(Object, String, QName) } for details.
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165 * @param query The XPath query.
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166 * @param returnType The type of the result.
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167 * @return The result of type 'returnTyp' or null if something went
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168 * wrong during XPath evaluation.
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169 */
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170 public static final Object getXPath(String query, QName returnType) {
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171 return XMLUtils.xpath(getConfig(), query, returnType);
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172 }
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173
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174 /**
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175 * Convenience method to search for a node list within the central
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176 * configuation document via XPath.
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177 * @param query The XPath query.
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178 * @return The queried node list or null if something went
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179 * wrong during XPath evaluation.
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180 */
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181 public static final NodeList getNodeSetXPath(String query) {
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182 return (NodeList)getXPath(query, XPathConstants.NODESET);
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183 }
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184
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185 /**
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186 * Convenience method to search for a node within the central
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187 * configuation document via XPath.
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188 * @param query The XPath query.
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189 * @return The queried node or null if something went
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190 * wrong during XPath evaluation.
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191 */
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192 public static final Node getNodeXPath(String query) {
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193 return (Node)getXPath(query, XPathConstants.NODE);
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194 }
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195
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196 /**
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197 * Convenience method to search for a string within the central
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198 * configuation document via XPath.
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199 * @param xpath The XPath query.
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200 * @return The queried string or null if something went
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201 * wrong during XPath evaluation.
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202 */
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203 public static final String getStringXPath(String xpath) {
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204 return getStringXPath(xpath, null);
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205 }
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206
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207 /**
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208 * Convenience method to search for a string within the central
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209 * configuation document via XPath.
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210 * @param query The XPath query.
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211 * @param def The string to be returned if the search has no results.
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212 * @return The queried string or the default value if something went
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213 * wrong during XPath evaluation.
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214 */
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215 public static final String getStringXPath(String query, String def) {
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216 String s = (String)getXPath(query, XPathConstants.STRING);
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217 return s == null || s.length() == 0
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218 ? def
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219 : s;
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220 }
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221
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222 /**
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223 * Convenience method to search for a node list within a given tree
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224 * via XPath.
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225 * @param root The root of the tree to be searched in.
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226 * @param query The XPath query.
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227 * @return The queried node list or null if something went
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228 * wrong during XPath evaluation.
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229 */
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230 public static final NodeList getNodeSetXPath(Object root, String query) {
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231 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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232 }
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233
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234 /**
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235 * Convenience method to search for a node within a given tree
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236 * via XPath.
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237 * @param root The root of the tree to be searched in.
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238 * @param query The XPath query.
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239 * @return The queried node or null if something went
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240 * wrong during XPath evaluation.
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241 */
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242 public static final Node getNodeXPath(Object root, String query) {
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243 return (Node)getXPath(root, query, XPathConstants.NODE);
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244 }
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245
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246 /**
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247 * Convenience method to search for a string within a given tree
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248 * via XPath.
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249 * @param root The root of the tree to be searched in.
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250 * @param xpath The XPath query.
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251 * @return The queried string or null if something went
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252 * wrong during XPath evaluation.
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253 */
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254 public static final String getStringXPath(Object root, String xpath) {
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255 return getStringXPath(root, xpath, null);
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256 }
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257
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258 /**
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259 * Convenience method to search for a string within a given tree
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260 * via XPath.
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261 * @param root The root of the tree to be searched in.
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262 * @param query xpath The XPath query.
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263 * @param def The string to be returned if the search has no results.
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264 * @return The queried string or the default value if something went
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265 * wrong during XPath evaluation.
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266 */
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267 public static final String getStringXPath(
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268 Object root, String query, String def
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269 ) {
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270 String s = (String)getXPath(root, query, XPathConstants.STRING);
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271 return s == null || s.length() == 0
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272 ? def
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273 : s;
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274 }
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275 }
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276 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org