Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 5:8f2de197bce2

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Added config to artifact database and modelled bootstap of artifact factories on top of this. artifacts/trunk@15 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 04 Sep 2009 12:04:12 +0000
parents
children a5a279a0ee35
rev   line source
5
8f2de197bce2 Added config to artifact database and modelled bootstap of artifact factories on top of this.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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
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9 import org.xml.sax.SAXException;
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10
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11 import javax.xml.parsers.DocumentBuilderFactory;
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12
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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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16
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17 import javax.xml.xpath.XPathFactory;
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18 import javax.xml.xpath.XPath;
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19 import javax.xml.xpath.XPathExpressionException;
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20 import javax.xml.xpath.XPathConstants;
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21
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22 public final class Config
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23 {
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24 public static final String CONFIG_PROPERTY = "artifact.database.config";
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25
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26 public static final String CONFIG_DEFAULT = "artifactdb-conf.xml";
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27
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28 private static Document config;
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29
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30 private Config() {
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31 }
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32
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33 public static synchronized final Document getConfig() {
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34 if (config == null) {
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35 config = loadConfig();
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36 }
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37 return config;
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38 }
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39
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40 private static Document loadConfig() {
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41 File file = new File(
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42 System.getProperty(CONFIG_PROPERTY, CONFIG_DEFAULT));
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43
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44 if (!file.canRead() && !file.isFile()) {
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45 System.err.println("ERROR: cannot read config file '"
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46 + file + "'.");
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47 return null;
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48 }
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49
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50 try {
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51 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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52 factory.setValidating(false); // XXX: This may change in future.
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53 return factory.newDocumentBuilder().parse(file);
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54 }
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55 catch (SAXException se) {
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56 System.err.println("ERROR: while processing XML file '"
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57 + file + "'");
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58 se.printStackTrace(System.err);
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59 }
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60 catch (ParserConfigurationException pce) {
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61 System.err.println("ERROR: with XML configuration");
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62 pce.printStackTrace(System.err);
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63 }
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64 catch (IOException ioe) {
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65 System.err.println("ERROR: I/O while processing file '"
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66 + file + "'");
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67 ioe.printStackTrace(System.err);
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68 }
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69
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70 return null;
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71 }
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72
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73 public static final String getStringXPath(String xpath) {
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74 return getStringXPath(xpath, null);
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75 }
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76
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77 public static final String getStringXPath(String query, String def) {
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78 String s = (String)getXPath(query, XPathConstants.STRING);
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79 return s == null || s.length() == 0
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80 ? def
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81 : s;
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82 }
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83
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84 public static final Object getXPath(String query, QName returnType) {
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85 Document document = getConfig();
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86 if (document == null) {
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87 return null;
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88 }
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89
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90 XPathFactory factory = XPathFactory.newInstance();
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91 XPath xpath = factory.newXPath();
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92
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93 try {
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94 return xpath.evaluate(query, document, returnType);
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95 }
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96 catch (XPathExpressionException xpee) {
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97 xpee.printStackTrace(System.err);
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98 }
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99
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100 return null;
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101 }
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102
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103 public static final NodeList getNodeSetXPath(String query) {
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104 return (NodeList)getXPath(query, XPathConstants.NODESET);
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105 }
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106 }
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107 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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108
http://dive4elements.wald.intevation.org