Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 9:a5a279a0ee35

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Laid tracks for artifacts being removed from artifact database. artifacts/trunk@24 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 04 Sep 2009 16:06:44 +0000
parents 8f2de197bce2
children e8626caac353
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
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8 import org.w3c.dom.Node;
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10 import org.xml.sax.SAXException;
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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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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 public final class Config
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24 {
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25 public static final String CONFIG_PROPERTY = "artifact.database.config";
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27 public static final String CONFIG_DEFAULT = "artifactdb-conf.xml";
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29 private static Document config;
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30
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31 private Config() {
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32 }
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33
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34 public static synchronized final Document getConfig() {
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35 if (config == null) {
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36 config = loadConfig();
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37 }
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38 return config;
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39 }
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41 private static Document loadConfig() {
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42 File file = new File(
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43 System.getProperty(CONFIG_PROPERTY, CONFIG_DEFAULT));
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44
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45 if (!file.canRead() && !file.isFile()) {
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46 System.err.println("ERROR: cannot read config file '"
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47 + file + "'.");
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48 return null;
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49 }
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50
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51 try {
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52 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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53 factory.setValidating(false); // XXX: This may change in future.
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54 return factory.newDocumentBuilder().parse(file);
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55 }
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56 catch (SAXException se) {
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57 System.err.println("ERROR: while processing XML file '"
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58 + file + "'");
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59 se.printStackTrace(System.err);
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60 }
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61 catch (ParserConfigurationException pce) {
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62 System.err.println("ERROR: with XML configuration");
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63 pce.printStackTrace(System.err);
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64 }
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65 catch (IOException ioe) {
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66 System.err.println("ERROR: I/O while processing file '"
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67 + file + "'");
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68 ioe.printStackTrace(System.err);
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69 }
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70
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71 return null;
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72 }
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74 public static final String getStringXPath(String xpath) {
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75 return getStringXPath(xpath, null);
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76 }
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78 public static final String getStringXPath(String query, String def) {
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79 String s = (String)getXPath(query, XPathConstants.STRING);
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80 return s == null || s.length() == 0
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81 ? def
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82 : s;
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83 }
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84
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85 public static final Object getXPath(String query, QName returnType) {
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86 Document document = getConfig();
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87 if (document == null) {
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88 return null;
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89 }
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90
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91 XPathFactory factory = XPathFactory.newInstance();
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92 XPath xpath = factory.newXPath();
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93
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94 try {
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95 return xpath.evaluate(query, document, returnType);
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96 }
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97 catch (XPathExpressionException xpee) {
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98 xpee.printStackTrace(System.err);
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99 }
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100
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101 return null;
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102 }
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103
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104 public static final NodeList getNodeSetXPath(String query) {
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105 return (NodeList)getXPath(query, XPathConstants.NODESET);
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106 }
9
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108 public static final Node getNodeXPath(String query) {
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109 return (Node)getXPath(query, XPathConstants.NODE);
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110 }
5
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111 }
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112 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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113
http://dive4elements.wald.intevation.org