Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/Config.java @ 206:33f58a847fc4
Added a copy of Config in the commons package. TODO: Remove it from artifacts-database.
artifacts/trunk@1475 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 15 Mar 2011 15:25:43 +0000 |
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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.artifacts.common.utils; |
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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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15 |
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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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20 |
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21 import org.apache.log4j.Logger; |
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22 |
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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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39 |
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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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44 |
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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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52 |
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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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57 |
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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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65 |
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66 private static Document config; |
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67 |
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68 private Config() { |
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69 } |
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70 |
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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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81 |
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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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102 |
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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 : |