Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 23:00596a591a2f

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Added possibibilty to ceate XPaths with namespace contextes. artifacts/trunk@57 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 10 Sep 2009 08:14:03 +0000
parents 1259d192e3c3
children ccc6aae25585
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.XPathExpressionException;
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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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23 /**
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24 * @author Sascha L. Teichmann
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25 */
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26 public final class Config
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27 {
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28 private static Logger logger = Logger.getLogger(Config.class);
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29
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30 public static final String CONFIG_DIR = "artifact.database.dir";
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31
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32 public static final File CONFIG_DIR_DEFAULT =
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33 new File(new File(System.getProperty("user.home",
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34 System.getProperty("user.dir", "."))), ".artifactdb");
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35
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36 public static final String CONFIG_FILE = "conf.xml";
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37
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38 private static Document config;
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39
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40 private Config() {
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41 }
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42
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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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49
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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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56
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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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64
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65 private static Document loadConfig() {
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66
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67 File configDir = getConfigDirectory();
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68
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69 File file = new File(configDir, CONFIG_FILE);
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70
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71 if (!file.canRead() && !file.isFile()) {
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72 logger.error("Cannot read config file '"
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73 + file + "'.");
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74 return null;
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75 }
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76
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77 try {
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78 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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79 factory.setValidating(false); // XXX: This may change in future.
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80 return factory.newDocumentBuilder().parse(file);
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81 }
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82 catch (SAXException se) {
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83 logger.error(se.getLocalizedMessage(), se);
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84 }
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85 catch (ParserConfigurationException pce) {
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86 logger.error(pce.getLocalizedMessage(), pce);
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87 }
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88 catch (IOException ioe) {
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89 logger.error(ioe.getLocalizedMessage());
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90 }
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91
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92 return null;
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93 }
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94
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95 public static final Object getXPath(
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96 Object root, String query, QName returnType
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97 ) {
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98 if (root == null) {
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99 return null;
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100 }
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101
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102 try {
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103 return XMLUtils.newXPath().evaluate(query, root, returnType);
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104 }
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105 catch (XPathExpressionException xpee) {
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106 logger.error(xpee.getLocalizedMessage(), xpee);
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107 }
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108
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109 return null;
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110 }
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111
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112 public static final Object getXPath(String query, QName returnType) {
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113 return getXPath(getConfig(), query, returnType);
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114 }
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115
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116 public static final NodeList getNodeSetXPath(String query) {
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117 return (NodeList)getXPath(query, XPathConstants.NODESET);
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118 }
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119
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120 public static final Node getNodeXPath(String query) {
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121 return (Node)getXPath(query, XPathConstants.NODE);
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122 }
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123
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124 public static final String getStringXPath(String xpath) {
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125 return getStringXPath(xpath, null);
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126 }
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127
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128 public static final String getStringXPath(String query, String def) {
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129 String s = (String)getXPath(query, XPathConstants.STRING);
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130 return s == null || s.length() == 0
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131 ? def
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132 : s;
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133 }
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134
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135 public static final NodeList getNodeSetXPath(Object root, String query) {
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136 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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137 }
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138
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139 public static final Node getNodeXPath(Object root, String query) {
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140 return (Node)getXPath(root, query, XPathConstants.NODE);
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141 }
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142
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143 public static final String getStringXPath(Object root, String xpath) {
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144 return getStringXPath(root, xpath, null);
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145 }
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146
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147 public static final String getStringXPath(
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148 Object root, String query, String def
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149 ) {
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150 String s = (String)getXPath(root, query, XPathConstants.STRING);
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151 return s == null || s.length() == 0
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152 ? def
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153 : s;
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154 }
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155 }
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156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org