Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 17:5a6b6a3debc7

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Integrated logging into artifact database. artifacts/trunk@33 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 08 Sep 2009 06:29:52 +0000
parents 0d6badf6af42
children 1259d192e3c3
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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22
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23 import org.apache.log4j.Logger;
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24
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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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31
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32 public static final String CONFIG_PROPERTY = "artifact.database.config";
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33
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34 public static final String CONFIG_DEFAULT = "artifactdb-conf.xml";
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35
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36 private static Document config;
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37
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38 private Config() {
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39 }
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40
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41 public static synchronized final Document getConfig() {
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42 if (config == null) {
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43 config = loadConfig();
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44 }
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45 return config;
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46 }
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47
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48 private static Document loadConfig() {
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49 File file = new File(
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50 System.getProperty(CONFIG_PROPERTY, CONFIG_DEFAULT));
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51
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52 if (!file.canRead() && !file.isFile()) {
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53 logger.error("Cannot read config file '"
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54 + file + "'.");
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55 return null;
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56 }
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57
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58 try {
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59 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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60 factory.setValidating(false); // XXX: This may change in future.
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61 return factory.newDocumentBuilder().parse(file);
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62 }
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63 catch (SAXException se) {
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64 logger.error(se.getLocalizedMessage(), se);
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65 }
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66 catch (ParserConfigurationException pce) {
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67 logger.error(pce.getLocalizedMessage(), pce);
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68 }
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69 catch (IOException ioe) {
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70 logger.error(ioe.getLocalizedMessage());
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71 }
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72
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73 return null;
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74 }
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76 public static final Object getXPath(
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77 Object root, String query, QName returnType
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78 ) {
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79 if (root == null) {
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80 return null;
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81 }
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83 XPathFactory factory = XPathFactory.newInstance();
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84 XPath xpath = factory.newXPath();
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85
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86 try {
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87 return xpath.evaluate(query, root, returnType);
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88 }
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89 catch (XPathExpressionException xpee) {
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90 logger.error(xpee.getLocalizedMessage(), xpee);
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91 }
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92
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93 return null;
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94 }
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95
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96 public static final Object getXPath(String query, QName returnType) {
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97 return getXPath(getConfig(), query, returnType);
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98 }
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99
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100 public static final NodeList getNodeSetXPath(String query) {
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101 return (NodeList)getXPath(query, XPathConstants.NODESET);
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102 }
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103
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104 public static final Node getNodeXPath(String query) {
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105 return (Node)getXPath(query, XPathConstants.NODE);
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106 }
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107
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108 public static final String getStringXPath(String xpath) {
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109 return getStringXPath(xpath, null);
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110 }
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111
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112 public static final String getStringXPath(String query, String def) {
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113 String s = (String)getXPath(query, XPathConstants.STRING);
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114 return s == null || s.length() == 0
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115 ? def
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116 : s;
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117 }
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118
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119 public static final NodeList getNodeSetXPath(Object root, String query) {
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120 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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121 }
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122
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123 public static final Node getNodeXPath(Object root, String query) {
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124 return (Node)getXPath(root, query, XPathConstants.NODE);
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125 }
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126
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127 public static final String getStringXPath(Object root, String xpath) {
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128 return getStringXPath(root, xpath, null);
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129 }
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130
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131 public static final String getStringXPath(
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132 Object root, String query, String def
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133 ) {
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134 String s = (String)getXPath(root, 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 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org