Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/XMLUtils.java @ 27:75bdaf900473

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Added REST handler for 'describe'. artifacts/trunk@64 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 10 Sep 2009 14:21:58 +0000
parents 83a059c204f8
children 4ae4dc99127d
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import org.w3c.dom.Document;
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4 import org.w3c.dom.Element;
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5 import org.w3c.dom.Attr;
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6
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7 import javax.xml.parsers.DocumentBuilderFactory;
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8
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9 import javax.xml.parsers.ParserConfigurationException;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import javax.xml.xpath.XPathFactory;
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14 import javax.xml.xpath.XPath;
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15 import javax.xml.xpath.XPathExpressionException;
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16 import javax.xml.xpath.XPathConstants;
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17
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18 import javax.xml.namespace.NamespaceContext;
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19 import javax.xml.namespace.QName;
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20
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21 /**
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22 * @author Sascha L. Teichmann
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23 */
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24 public final class XMLUtils
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25 {
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26 private static Logger logger = Logger.getLogger(XMLUtils.class);
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27
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28 private XMLUtils() {
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29 }
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30
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31 public static class ElementCreator
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32 {
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33 protected Document document;
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34 protected String ns;
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35 protected String prefix;
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36
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37 public ElementCreator(Document document, String ns, String prefix) {
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38 this.document = document;
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39 this.ns = ns;
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40 this.prefix = prefix;
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41 }
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42
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43 public Element create(String name) {
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44 Element element = document.createElementNS(ns, name);
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45 element.setPrefix(prefix);
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46 return element;
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47 }
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48
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49 public void addAttr(Element element, String name, String value) {
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50 Attr attr = document.createAttributeNS(ns, name);
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51 attr.setValue(value);
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52 attr.setPrefix(prefix);
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53 element.setAttributeNode(attr);
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54 }
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55 } // class ElementCreator
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56
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57 public static final Document newDocument() {
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58 try {
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59 return DocumentBuilderFactory
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60 .newInstance()
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61 .newDocumentBuilder()
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62 .newDocument();
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63 }
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64 catch (ParserConfigurationException pce) {
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65 logger.error(pce.getLocalizedMessage(), pce);
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66 }
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67 return null;
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68 }
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69
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70 public static final XPath newXPath() {
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71 return newXPath(null);
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72 }
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73
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74 public static final XPath newXPath(NamespaceContext namespaceContext) {
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75 XPathFactory factory = XPathFactory.newInstance();
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76 XPath xpath = factory.newXPath();
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77 if (namespaceContext != null) {
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78 xpath.setNamespaceContext(namespaceContext);
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79 }
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80 return xpath;
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81 }
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82
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83 public static final Object xpath(Object root, String query, QName returnTyp) {
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84 return xpath(root, query, returnTyp, null);
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85 }
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86
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87 public static final String xpathString(
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88 Object root, String query, NamespaceContext namespaceContext
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89 ) {
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90 return (String)xpath(root, query, XPathConstants.STRING, namespaceContext);
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91 }
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92
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93 public static final Object xpath(
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94 Object root,
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95 String query,
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96 QName returnType,
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97 NamespaceContext namespaceContext
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98 ) {
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99 if (root == null) {
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100 return null;
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101 }
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102
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103 try {
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104 XPath xpath = newXPath(namespaceContext);
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105 if (xpath != null) {
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106 return xpath.evaluate(query, root, returnType);
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107 }
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108 }
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109 catch (XPathExpressionException xpee) {
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110 logger.error(xpee.getLocalizedMessage(), xpee);
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111 }
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112
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113 return null;
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114 }
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115 }
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116 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org