Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 19:1259d192e3c3

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* New configuration based on config directory * Artifact database launches REST web server at startup. artifacts/trunk@43 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 09 Sep 2009 07:55:44 +0000
parents 5a6b6a3debc7
children 00596a591a2f
rev   line source
5
8f2de197bce2 Added config to artifact database and modelled bootstap of artifact factories on top of this.
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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
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14 import javax.xml.parsers.ParserConfigurationException;
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15
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16 import javax.xml.namespace.QName;
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17
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18 import javax.xml.xpath.XPathFactory;
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19 import javax.xml.xpath.XPath;
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20 import javax.xml.xpath.XPathExpressionException;
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21 import javax.xml.xpath.XPathConstants;
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23 import org.apache.log4j.Logger;
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25 /**
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26 * @author Sascha L. Teichmann
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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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32 public static final String CONFIG_DIR = "artifact.database.dir";
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33
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34 public static final File CONFIG_DIR_DEFAULT =
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35 new File(new File(System.getProperty("user.home",
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36 System.getProperty("user.dir", "."))), ".artifactdb");
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37
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38 public static final String CONFIG_FILE = "conf.xml";
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40 private static Document config;
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41
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42 private Config() {
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43 }
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44
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45 public static synchronized final Document getConfig() {
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46 if (config == null) {
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47 config = loadConfig();
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48 }
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49 return config;
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50 }
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51
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52 public static File getConfigDirectory() {
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53 String configDirString = System.getProperty(CONFIG_DIR);
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54
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55 File configDir = configDirString != null
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56 ? new File(configDirString)
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57 : CONFIG_DIR_DEFAULT;
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58
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59 if (!configDir.isDirectory()) {
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60 logger.warn("'" + configDir + "' is not a directory.");
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61 configDir = CONFIG_DIR_DEFAULT;
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62 }
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63
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64 return configDir;
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65 }
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66
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67 private static Document loadConfig() {
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68
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69 File configDir = getConfigDirectory();
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71 File file = new File(configDir, CONFIG_FILE);
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72
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73 if (!file.canRead() && !file.isFile()) {
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74 logger.error("Cannot read config file '"
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75 + file + "'.");
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76 return null;
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77 }
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78
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79 try {
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80 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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81 factory.setValidating(false); // XXX: This may change in future.
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82 return factory.newDocumentBuilder().parse(file);
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83 }
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84 catch (SAXException se) {
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85 logger.error(se.getLocalizedMessage(), se);
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86 }
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87 catch (ParserConfigurationException pce) {
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88 logger.error(pce.getLocalizedMessage(), pce);
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89 }
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90 catch (IOException ioe) {
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91 logger.error(ioe.getLocalizedMessage());
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92 }
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93
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94 return null;
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95 }
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96
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97 public static final Object getXPath(
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98 Object root, String query, QName returnType
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99 ) {
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100 if (root == null) {
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101 return null;
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102 }
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103
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104 XPathFactory factory = XPathFactory.newInstance();
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105 XPath xpath = factory.newXPath();
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106
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107 try {
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108 return xpath.evaluate(query, root, returnType);
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109 }
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110 catch (XPathExpressionException xpee) {
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111 logger.error(xpee.getLocalizedMessage(), xpee);
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112 }
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113
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114 return null;
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115 }
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117 public static final Object getXPath(String query, QName returnType) {
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118 return getXPath(getConfig(), query, returnType);
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119 }
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120
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121 public static final NodeList getNodeSetXPath(String query) {
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122 return (NodeList)getXPath(query, XPathConstants.NODESET);
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123 }
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124
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125 public static final Node getNodeXPath(String query) {
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126 return (Node)getXPath(query, XPathConstants.NODE);
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127 }
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128
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129 public static final String getStringXPath(String xpath) {
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130 return getStringXPath(xpath, null);
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131 }
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132
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133 public static final String getStringXPath(String query, String def) {
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134 String s = (String)getXPath(query, XPathConstants.STRING);
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135 return s == null || s.length() == 0
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136 ? def
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137 : s;
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138 }
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139
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140 public static final NodeList getNodeSetXPath(Object root, String query) {
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141 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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142 }
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143
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144 public static final Node getNodeXPath(Object root, String query) {
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145 return (Node)getXPath(root, query, XPathConstants.NODE);
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146 }
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147
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148 public static final String getStringXPath(Object root, String xpath) {
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149 return getStringXPath(root, xpath, null);
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150 }
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151
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152 public static final String getStringXPath(
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153 Object root, String query, String def
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154 ) {
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155 String s = (String)getXPath(root, query, XPathConstants.STRING);
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156 return s == null || s.length() == 0
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157 ? def
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158 : s;
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159 }
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160 }
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161 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org