Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/XMLUtils.java @ 62:76abf0c64d3b

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Added XML utils method to load XML file from file. artifacts/trunk@438 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 16 Dec 2009 08:08:56 +0000
parents 4ae4dc99127d
children 8b72676698b5
rev   line source
20
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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 org.xml.sax.SAXException;
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8
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9 import javax.xml.parsers.DocumentBuilderFactory;
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10
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11 import javax.xml.parsers.ParserConfigurationException;
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12
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13 import org.apache.log4j.Logger;
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14
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15 import javax.xml.xpath.XPathFactory;
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16 import javax.xml.xpath.XPath;
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17 import javax.xml.xpath.XPathExpressionException;
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18 import javax.xml.xpath.XPathConstants;
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19
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20 import javax.xml.namespace.NamespaceContext;
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21 import javax.xml.namespace.QName;
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22
62
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23 import java.io.File;
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24 import java.io.IOException;
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26 /**
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27 * @author Sascha L. Teichmann
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28 */
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29 public final class XMLUtils
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30 {
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31 private static Logger logger = Logger.getLogger(XMLUtils.class);
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32
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33 private XMLUtils() {
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34 }
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35
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36 public static class ElementCreator
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37 {
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38 protected Document document;
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39 protected String ns;
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40 protected String prefix;
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41
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42 public ElementCreator(Document document, String ns, String prefix) {
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43 this.document = document;
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44 this.ns = ns;
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45 this.prefix = prefix;
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46 }
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47
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48 public Element create(String name) {
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49 Element element = document.createElementNS(ns, name);
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50 element.setPrefix(prefix);
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51 return element;
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52 }
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53
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54 public void addAttr(Element element, String name, String value) {
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55 Attr attr = document.createAttributeNS(ns, name);
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56 attr.setValue(value);
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57 attr.setPrefix(prefix);
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58 element.setAttributeNode(attr);
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59 }
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60 } // class ElementCreator
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61
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62 public static final Document newDocument() {
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63 try {
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64 return DocumentBuilderFactory
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65 .newInstance()
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66 .newDocumentBuilder()
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67 .newDocument();
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68 }
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69 catch (ParserConfigurationException pce) {
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70 logger.error(pce.getLocalizedMessage(), pce);
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71 }
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72 return null;
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73 }
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74
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75 public static final Document parseDocument(File file) {
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76 try {
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77 return DocumentBuilderFactory
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78 .newInstance()
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79 .newDocumentBuilder()
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80 .parse(file);
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81 }
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82 catch (ParserConfigurationException pce) {
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83 logger.error(pce.getLocalizedMessage(), pce);
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84 }
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85 catch (SAXException se) {
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86 logger.error(se.getLocalizedMessage(), se);
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87 }
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88 catch (IOException ioe) {
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89 logger.error(ioe.getLocalizedMessage(), ioe);
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90 }
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91 return null;
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92 }
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93
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94 public static final XPath newXPath() {
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95 return newXPath(null);
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96 }
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97
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98 public static final XPath newXPath(NamespaceContext namespaceContext) {
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99 XPathFactory factory = XPathFactory.newInstance();
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100 XPath xpath = factory.newXPath();
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101 if (namespaceContext != null) {
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102 xpath.setNamespaceContext(namespaceContext);
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103 }
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104 return xpath;
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105 }
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106
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107 public static final Object xpath(Object root, String query, QName returnTyp) {
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108 return xpath(root, query, returnTyp, null);
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109 }
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110
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111 public static final String xpathString(
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112 Object root, String query, NamespaceContext namespaceContext
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113 ) {
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114 return (String)xpath(root, query, XPathConstants.STRING, namespaceContext);
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115 }
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116
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117 public static final Object xpath(
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118 Object root,
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119 String query,
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120 QName returnType,
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121 NamespaceContext namespaceContext
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122 ) {
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123 if (root == null) {
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124 return null;
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125 }
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126
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127 try {
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128 XPath xpath = newXPath(namespaceContext);
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129 if (xpath != null) {
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130 return xpath.evaluate(query, root, returnType);
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131 }
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132 }
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133 catch (XPathExpressionException xpee) {
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134 logger.error(xpee.getLocalizedMessage(), xpee);
47
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135 }
25
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136
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137 return null;
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138 }
20
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139 }
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140 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org