Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 91:730ff077a58c

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More javadoc, some code formatting. artifacts/trunk@847 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 28 Mar 2010 10:01:03 +0000
parents 8447467cef86
children e27cf9c84eb8
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import java.io.File;
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4 import java.io.IOException;
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5
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6 import org.w3c.dom.Document;
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7 import org.w3c.dom.NodeList;
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8 import org.w3c.dom.Node;
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9
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10 import org.xml.sax.SAXException;
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11
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12 import javax.xml.parsers.DocumentBuilderFactory;
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13 import javax.xml.parsers.ParserConfigurationException;
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14
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15 import javax.xml.namespace.QName;
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16
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17 import javax.xml.xpath.XPathConstants;
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19 import org.apache.log4j.Logger;
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20
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21 /**
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22 * The central access to the configuration of the artifact database.
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23 * This class provides some static methods to access the central
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24 * configuration XML file via XPath.
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25 *
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26 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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27 */
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28 public final class Config
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29 {
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30 private static Logger logger = Logger.getLogger(Config.class);
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31
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32 /**
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33 * System property name where to find the configuration directory.
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34 */
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35 public static final String CONFIG_DIR = "artifact.database.dir";
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37 /**
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38 * Default path to the configuration directory if none
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39 * was specified by the CONFIG_DIR system property.
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40 */
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41 public static final File CONFIG_DIR_DEFAULT =
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42 new File(new File(System.getProperty("user.home",
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43 System.getProperty("user.dir", "."))), ".artifactdb");
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45 /**
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46 * Name of the central configuration XML file.
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47 */
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48 public static final String CONFIG_FILE = "conf.xml";
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50 /**
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51 * Name of the configuration filename alias to be use
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52 * within the configuration. This alias is replaced by
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53 * the real path.
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54 */
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55 public static final String CONFIG_DIR_PLACEHOLDER =
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56 "${artifacts.config.dir}";
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57
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58 private static Document config;
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59
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60 private Config() {
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61 }
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63 /**
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64 * Singleton access to the central XML configuration document.
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65 * @return The central XML configuration document.
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66 */
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67 public static synchronized final Document getConfig() {
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68 if (config == null) {
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69 config = loadConfig();
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70 }
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71 return config;
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72 }
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74 /**
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75 * Returns the path to the configuartion directory. If a path
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76 * was specified via the CONFIG_DIR system property this one
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77 * is used. Else it falls back to default configuration path.
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78 * @return The path to the configuartion directory.
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79 */
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80 public static File getConfigDirectory() {
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81 String configDirString = System.getProperty(CONFIG_DIR);
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82
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83 File configDir = configDirString != null
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84 ? new File(configDirString)
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85 : CONFIG_DIR_DEFAULT;
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86
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87 if (!configDir.isDirectory()) {
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88 logger.warn("'" + configDir + "' is not a directory.");
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89 configDir = CONFIG_DIR_DEFAULT;
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90 }
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92 return configDir;
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93 }
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95 /**
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96 * Replaces the CONFIG_DIR_PLACEHOLDER alias with the real path
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97 * of the configuration directory.
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98 * @param path The path containing the CONFIG_DIR_PLACEHOLDER placeholder.
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99 * @return The path where the CONFIG_DIR_PLACEHOLDER placeholders are
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100 * replaced by the real path name.
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101 */
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102 public static String replaceConfigDir(String path) {
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103 String configDir = getConfigDirectory().getAbsolutePath();
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104 return path.replace(CONFIG_DIR_PLACEHOLDER, configDir);
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105 }
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106
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107 private static Document loadConfig() {
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108
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109 File configDir = getConfigDirectory();
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110
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111 File file = new File(configDir, CONFIG_FILE);
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112
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113 if (!file.canRead() && !file.isFile()) {
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114 logger.error("Cannot read config file '"
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115 + file + "'.");
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116 return null;
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117 }
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119 try {
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120 DocumentBuilderFactory factory =
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121 DocumentBuilderFactory.newInstance();
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122 factory.setValidating(false); // XXX: This may change in future.
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123 return factory.newDocumentBuilder().parse(file);
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124 }
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125 catch (SAXException se) {
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126 logger.error(se.getLocalizedMessage(), se);
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127 }
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128 catch (ParserConfigurationException pce) {
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129 logger.error(pce.getLocalizedMessage(), pce);
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130 }
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131 catch (IOException ioe) {
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132 logger.error(ioe.getLocalizedMessage());
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133 }
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134
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135 return null;
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136 }
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137
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138 /**
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139 * Convenience method to search within a given document tree via XPath.
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140 * See {@link XMLUtils#xpath(Object, String, QName) } for details.
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141 * @param root The object which is used as the root of the tree to
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142 * be searched in.
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143 * @param query The XPath query.
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144 * @param returnType The type of the result.
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145 * @return The result of type 'returnTyp' or null if something went
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146 * wrong during XPath evaluation.
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147 */
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148 public static final Object getXPath(
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149 Object root, String query, QName returnType
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150 ) {
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151 return XMLUtils.xpath(root, query, returnType);
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152 }
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153
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154 /**
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155 * Convenience method to search within the central configuration via XPath.
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156 * See {@link XMLUtils#xpath(Object, String, QName) } for details.
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157 * @param query The XPath query.
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158 * @param returnType The type of the result.
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159 * @return The result of type 'returnTyp' or null if something went
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160 * wrong during XPath evaluation.
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161 */
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162 public static final Object getXPath(String query, QName returnType) {
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163 return XMLUtils.xpath(getConfig(), query, returnType);
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164 }
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165
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166 /**
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167 * Convenience method to search for a node list within the central
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168 * configuation document via XPath.
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169 * @param query The XPath query.
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170 * @return The queried node list or null if something went
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171 * wrong during XPath evaluation.
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172 */
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173 public static final NodeList getNodeSetXPath(String query) {
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174 return (NodeList)getXPath(query, XPathConstants.NODESET);
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175 }
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176
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177 /**
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178 * Convenience method to search for a node within the central
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179 * configuation document via XPath.
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180 * @param query The XPath query.
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181 * @return The queried node or null if something went
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182 * wrong during XPath evaluation.
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183 */
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184 public static final Node getNodeXPath(String query) {
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185 return (Node)getXPath(query, XPathConstants.NODE);
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186 }
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187
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188 /**
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189 * Convenience method to search for a string within the central
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190 * configuation document via XPath.
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191 * @param xpath The XPath query.
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192 * @return The queried string or null if something went
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193 * wrong during XPath evaluation.
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194 */
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195 public static final String getStringXPath(String xpath) {
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196 return getStringXPath(xpath, null);
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197 }
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198
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199 /**
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200 * Convenience method to search for a string within the central
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201 * configuation document via XPath.
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202 * @param query The XPath query.
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203 * @param def The string to be returned if the search has no results.
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204 * @return The queried string or the default value if something went
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205 * wrong during XPath evaluation.
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206 */
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207 public static final String getStringXPath(String query, String def) {
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208 String s = (String)getXPath(query, XPathConstants.STRING);
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209 return s == null || s.length() == 0
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210 ? def
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211 : s;
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212 }
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213
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214 /**
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215 * Convenience method to search for a node list within a given tree
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216 * via XPath.
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217 * @param root The root of the tree to be searched in.
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218 * @param query The XPath query.
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219 * @return The queried node list or null if something went
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220 * wrong during XPath evaluation.
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221 */
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222 public static final NodeList getNodeSetXPath(Object root, String query) {
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223 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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224 }
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225
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226 /**
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227 * Convenience method to search for a node within a given tree
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228 * via XPath.
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229 * @param root The root of the tree to be searched in.
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230 * @param query The XPath query.
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231 * @return The queried node or null if something went
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232 * wrong during XPath evaluation.
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233 */
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234 public static final Node getNodeXPath(Object root, String query) {
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235 return (Node)getXPath(root, query, XPathConstants.NODE);
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236 }
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237
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238 /**
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239 * Convenience method to search for a string within a given tree
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240 * via XPath.
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241 * @param root The root of the tree to be searched in.
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242 * @param xpath The XPath query.
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243 * @return The queried string or null if something went
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244 * wrong during XPath evaluation.
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245 */
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246 public static final String getStringXPath(Object root, String xpath) {
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247 return getStringXPath(root, xpath, null);
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248 }
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249
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250 /**
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251 * Convenience method to search for a string within a given tree
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252 * via XPath.
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253 * @param root The root of the tree to be searched in.
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254 * @param query xpath The XPath query.
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255 * @param def The string to be returned if the search has no results.
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256 * @return The queried string or the default value if something went
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257 * wrong during XPath evaluation.
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258 */
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259 public static final String getStringXPath(
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260 Object root, String query, String def
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261 ) {
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262 String s = (String)getXPath(root, query, XPathConstants.STRING);
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263 return s == null || s.length() == 0
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264 ? def
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265 : s;
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266 }
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267 }
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268 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org