Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/de/intevation/artifactdatabase/Config.java @ 5:8f2de197bce2
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 |
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| 4:13a12b607baf | 5:8f2de197bce2 |
|---|---|
| 1 package de.intevation.artifactdatabase; | |
| 2 | |
| 3 import java.io.File; | |
| 4 import java.io.IOException; | |
| 5 | |
| 6 import org.w3c.dom.Document; | |
| 7 import org.w3c.dom.NodeList; | |
| 8 | |
| 9 import org.xml.sax.SAXException; | |
| 10 | |
| 11 import javax.xml.parsers.DocumentBuilderFactory; | |
| 12 | |
| 13 import javax.xml.parsers.ParserConfigurationException; | |
| 14 | |
| 15 import javax.xml.namespace.QName; | |
| 16 | |
| 17 import javax.xml.xpath.XPathFactory; | |
| 18 import javax.xml.xpath.XPath; | |
| 19 import javax.xml.xpath.XPathExpressionException; | |
| 20 import javax.xml.xpath.XPathConstants; | |
| 21 | |
| 22 public final class Config | |
| 23 { | |
| 24 public static final String CONFIG_PROPERTY = "artifact.database.config"; | |
| 25 | |
| 26 public static final String CONFIG_DEFAULT = "artifactdb-conf.xml"; | |
| 27 | |
| 28 private static Document config; | |
| 29 | |
| 30 private Config() { | |
| 31 } | |
| 32 | |
| 33 public static synchronized final Document getConfig() { | |
| 34 if (config == null) { | |
| 35 config = loadConfig(); | |
| 36 } | |
| 37 return config; | |
| 38 } | |
| 39 | |
| 40 private static Document loadConfig() { | |
| 41 File file = new File( | |
| 42 System.getProperty(CONFIG_PROPERTY, CONFIG_DEFAULT)); | |
| 43 | |
| 44 if (!file.canRead() && !file.isFile()) { | |
| 45 System.err.println("ERROR: cannot read config file '" | |
| 46 + file + "'."); | |
| 47 return null; | |
| 48 } | |
| 49 | |
| 50 try { | |
| 51 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); | |
| 52 factory.setValidating(false); // XXX: This may change in future. | |
| 53 return factory.newDocumentBuilder().parse(file); | |
| 54 } | |
| 55 catch (SAXException se) { | |
| 56 System.err.println("ERROR: while processing XML file '" | |
| 57 + file + "'"); | |
| 58 se.printStackTrace(System.err); | |
| 59 } | |
| 60 catch (ParserConfigurationException pce) { | |
| 61 System.err.println("ERROR: with XML configuration"); | |
| 62 pce.printStackTrace(System.err); | |
| 63 } | |
| 64 catch (IOException ioe) { | |
| 65 System.err.println("ERROR: I/O while processing file '" | |
| 66 + file + "'"); | |
| 67 ioe.printStackTrace(System.err); | |
| 68 } | |
| 69 | |
| 70 return null; | |
| 71 } | |
| 72 | |
| 73 public static final String getStringXPath(String xpath) { | |
| 74 return getStringXPath(xpath, null); | |
| 75 } | |
| 76 | |
| 77 public static final String getStringXPath(String query, String def) { | |
| 78 String s = (String)getXPath(query, XPathConstants.STRING); | |
| 79 return s == null || s.length() == 0 | |
| 80 ? def | |
| 81 : s; | |
| 82 } | |
| 83 | |
| 84 public static final Object getXPath(String query, QName returnType) { | |
| 85 Document document = getConfig(); | |
| 86 if (document == null) { | |
| 87 return null; | |
| 88 } | |
| 89 | |
| 90 XPathFactory factory = XPathFactory.newInstance(); | |
| 91 XPath xpath = factory.newXPath(); | |
| 92 | |
| 93 try { | |
| 94 return xpath.evaluate(query, document, returnType); | |
| 95 } | |
| 96 catch (XPathExpressionException xpee) { | |
| 97 xpee.printStackTrace(System.err); | |
| 98 } | |
| 99 | |
| 100 return null; | |
| 101 } | |
| 102 | |
| 103 public static final NodeList getNodeSetXPath(String query) { | |
| 104 return (NodeList)getXPath(query, XPathConstants.NODESET); | |
| 105 } | |
| 106 } | |
| 107 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: | |
| 108 |