Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 11:af07d004d320

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Fixed typo in xpath expression. artifacts/trunk@26 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 06 Sep 2009 13:22:34 +0000
parents e8626caac353
children 0d6badf6af42
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;
9
a5a279a0ee35 Laid tracks for artifacts being removed from artifact database.
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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 /**
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24 * @author Sascha L. Teichmann
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25 */
5
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26 public final class Config
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27 {
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28 public static final String CONFIG_PROPERTY = "artifact.database.config";
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29
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30 public static final String CONFIG_DEFAULT = "artifactdb-conf.xml";
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31
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32 private static Document config;
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33
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34 private Config() {
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35 }
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36
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37 public static synchronized final Document getConfig() {
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38 if (config == null) {
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39 config = loadConfig();
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40 }
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41 return config;
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42 }
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43
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44 private static Document loadConfig() {
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45 File file = new File(
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46 System.getProperty(CONFIG_PROPERTY, CONFIG_DEFAULT));
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47
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48 if (!file.canRead() && !file.isFile()) {
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49 System.err.println("ERROR: cannot read config file '"
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50 + file + "'.");
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51 return null;
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52 }
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53
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54 try {
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55 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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56 factory.setValidating(false); // XXX: This may change in future.
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57 return factory.newDocumentBuilder().parse(file);
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58 }
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59 catch (SAXException se) {
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60 System.err.println("ERROR: while processing XML file '"
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61 + file + "'");
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62 se.printStackTrace(System.err);
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63 }
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64 catch (ParserConfigurationException pce) {
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65 System.err.println("ERROR: with XML configuration");
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66 pce.printStackTrace(System.err);
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67 }
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68 catch (IOException ioe) {
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69 System.err.println("ERROR: I/O while processing file '"
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70 + file + "'");
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71 ioe.printStackTrace(System.err);
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72 }
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73
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74 return null;
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75 }
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76
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77 public static final Object getXPath(
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78 Object root, String query, QName returnType
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79 ) {
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80 if (root == null) {
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81 return null;
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82 }
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83
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84 XPathFactory factory = XPathFactory.newInstance();
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85 XPath xpath = factory.newXPath();
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86
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87 try {
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88 return xpath.evaluate(query, root, returnType);
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89 }
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90 catch (XPathExpressionException xpee) {
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91 xpee.printStackTrace(System.err);
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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(String query, QName returnType) {
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98 return getXPath(getConfig(), query, returnType);
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99 }
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100
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101 public static final NodeList getNodeSetXPath(String query) {
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102 return (NodeList)getXPath(query, XPathConstants.NODESET);
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103 }
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104
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105 public static final Node getNodeXPath(String query) {
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106 return (Node)getXPath(query, XPathConstants.NODE);
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107 }
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108
5
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109 public static final String getStringXPath(String xpath) {
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110 return getStringXPath(xpath, null);
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111 }
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112
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113 public static final String getStringXPath(String query, String def) {
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114 String s = (String)getXPath(query, XPathConstants.STRING);
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115 return s == null || s.length() == 0
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116 ? def
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117 : s;
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118 }
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119
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120 public static final NodeList getNodeSetXPath(Object root, String query) {
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121 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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122 }
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123
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124 public static final Node getNodeXPath(Object root, String query) {
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125 return (Node)getXPath(root, query, XPathConstants.NODE);
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126 }
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127
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128 public static final String getStringXPath(Object root, String xpath) {
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129 return getStringXPath(root, xpath, null);
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130 }
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131
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132 public static final String getStringXPath(
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133 Object root, String query, String def
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134 ) {
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135 String s = (String)getXPath(root, query, XPathConstants.STRING);
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136 return s == null || s.length() == 0
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137 ? def
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138 : s;
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139 }
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140 }
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141 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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142
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