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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 57:cf9848c85755 0.2

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RELEASE 0.2: Summarized NEWS and Changes artifacts/trunk@338 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Hans Plum <hans.plum@intevation.de>
date Fri, 13 Nov 2009 18:37:51 +0000
parents c2fc85e55f9f
children 8cd770330f1b
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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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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10 import org.xml.sax.SAXException;
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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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17 import javax.xml.xpath.XPathConstants;
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19 import org.apache.log4j.Logger;
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21 /**
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22 * @author Sascha L. Teichmann
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23 */
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24 public final class Config
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25 {
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26 private static Logger logger = Logger.getLogger(Config.class);
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28 public static final String CONFIG_DIR = "artifact.database.dir";
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30 public static final File CONFIG_DIR_DEFAULT =
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31 new File(new File(System.getProperty("user.home",
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32 System.getProperty("user.dir", "."))), ".artifactdb");
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34 public static final String CONFIG_FILE = "conf.xml";
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36 public static final String CONFIG_DIR_PLACEHOLDER = "${artifacts.config.dir}";
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38 private static Document config;
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40 private Config() {
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41 }
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43 public static synchronized final Document getConfig() {
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44 if (config == null) {
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45 config = loadConfig();
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46 }
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47 return config;
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48 }
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50 public static File getConfigDirectory() {
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51 String configDirString = System.getProperty(CONFIG_DIR);
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52
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53 File configDir = configDirString != null
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54 ? new File(configDirString)
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55 : CONFIG_DIR_DEFAULT;
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57 if (!configDir.isDirectory()) {
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58 logger.warn("'" + configDir + "' is not a directory.");
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59 configDir = CONFIG_DIR_DEFAULT;
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60 }
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61
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62 return configDir;
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63 }
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65 public static String replaceConfigDir(String path) {
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66 String configDir = getConfigDirectory().getAbsolutePath();
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67 return path.replace(CONFIG_DIR_PLACEHOLDER, configDir);
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68 }
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70 private static Document loadConfig() {
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72 File configDir = getConfigDirectory();
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73
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74 File file = new File(configDir, CONFIG_FILE);
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75
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76 if (!file.canRead() && !file.isFile()) {
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77 logger.error("Cannot read config file '"
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78 + file + "'.");
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79 return null;
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80 }
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82 try {
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83 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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84 factory.setValidating(false); // XXX: This may change in future.
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85 return factory.newDocumentBuilder().parse(file);
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86 }
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87 catch (SAXException se) {
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88 logger.error(se.getLocalizedMessage(), se);
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89 }
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90 catch (ParserConfigurationException pce) {
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91 logger.error(pce.getLocalizedMessage(), pce);
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92 }
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93 catch (IOException ioe) {
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94 logger.error(ioe.getLocalizedMessage());
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95 }
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97 return null;
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98 }
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99
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100 public static final Object getXPath(
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101 Object root, String query, QName returnType
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102 ) {
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103 return XMLUtils.xpath(root, query, returnType);
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104 }
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105
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106 public static final Object getXPath(String query, QName returnType) {
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107 return XMLUtils.xpath(getConfig(), query, returnType);
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108 }
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109
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110 public static final NodeList getNodeSetXPath(String query) {
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111 return (NodeList)getXPath(query, XPathConstants.NODESET);
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112 }
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114 public static final Node getNodeXPath(String query) {
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115 return (Node)getXPath(query, XPathConstants.NODE);
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116 }
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117
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118 public static final String getStringXPath(String xpath) {
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119 return getStringXPath(xpath, null);
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120 }
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121
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122 public static final String getStringXPath(String query, String def) {
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123 String s = (String)getXPath(query, XPathConstants.STRING);
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124 return s == null || s.length() == 0
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125 ? def
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126 : s;
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127 }
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128
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129 public static final NodeList getNodeSetXPath(Object root, String query) {
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130 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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131 }
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132
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133 public static final Node getNodeXPath(Object root, String query) {
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134 return (Node)getXPath(root, query, XPathConstants.NODE);
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135 }
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136
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137 public static final String getStringXPath(Object root, String xpath) {
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138 return getStringXPath(root, xpath, null);
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139 }
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140
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141 public static final String getStringXPath(
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142 Object root, String query, String def
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143 ) {
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144 String s = (String)getXPath(root, query, XPathConstants.STRING);
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145 return s == null || s.length() == 0
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146 ? def
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147 : s;
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148 }
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149 }
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150 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org