Mercurial > dive4elements > gnv-client
annotate gnv/src/main/java/de/intevation/gnv/util/XMLUtils.java @ 36:ad381cc47217
Format Code to max 80 Chars per Row
gnv/trunk@172 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Fri, 02 Oct 2009 08:54:13 +0000 |
parents | 4405f31bbc30 |
children | fccf90761825 |
rev | line source |
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1 package de.intevation.gnv.util; |
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2 |
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3 import java.io.IOException; |
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4 import java.io.InputStream; |
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5 import java.io.StringBufferInputStream; |
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6 import java.io.StringWriter; |
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7 |
35 | 8 import javax.xml.namespace.NamespaceContext; |
9 import javax.xml.namespace.QName; | |
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10 import javax.xml.parsers.DocumentBuilder; |
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11 import javax.xml.parsers.DocumentBuilderFactory; |
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12 import javax.xml.parsers.ParserConfigurationException; |
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13 import javax.xml.transform.Transformer; |
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14 import javax.xml.transform.TransformerConfigurationException; |
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15 import javax.xml.transform.TransformerException; |
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16 import javax.xml.transform.TransformerFactory; |
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17 import javax.xml.transform.TransformerFactoryConfigurationError; |
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18 import javax.xml.transform.dom.DOMSource; |
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19 import javax.xml.transform.stream.StreamResult; |
35 | 20 import javax.xml.xpath.XPath; |
21 import javax.xml.xpath.XPathConstants; | |
22 import javax.xml.xpath.XPathExpressionException; | |
23 import javax.xml.xpath.XPathFactory; | |
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24 |
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25 import org.apache.log4j.Logger; |
35 | 26 import org.w3c.dom.Attr; |
27 import org.w3c.dom.Document; | |
28 import org.w3c.dom.Element; | |
29 import org.w3c.dom.Node; | |
30 import org.w3c.dom.NodeList; | |
31 import org.xml.sax.SAXException; | |
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32 |
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33 /** |
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34 * @author Sascha L. Teichmann |
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35 */ |
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36 public class XMLUtils { |
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37 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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38 |
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39 public XMLUtils() { |
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40 } |
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41 |
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42 public static class ElementCreator { |
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43 protected Document document; |
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44 protected String ns; |
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45 protected String prefix; |
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46 |
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47 public ElementCreator(Document document, String ns, String prefix) { |
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48 this.document = document; |
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49 this.ns = ns; |
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50 this.prefix = prefix; |
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51 } |
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52 |
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53 public Element create(String name) { |
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54 Element element = document.createElementNS(ns, name); |
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55 element.setPrefix(prefix); |
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56 return element; |
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57 } |
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58 |
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59 public void addAttr(Element element, String name, String value) { |
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60 Attr attr = document.createAttributeNS(ns, name); |
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61 attr.setValue(value); |
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62 attr.setPrefix(prefix); |
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63 element.setAttributeNode(attr); |
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64 } |
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65 } // class ElementCreator |
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66 |
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67 public Document newDocument() { |
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68 try { |
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69 return DocumentBuilderFactory.newInstance().newDocumentBuilder() |
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70 .newDocument(); |
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71 } catch (ParserConfigurationException pce) { |
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72 logger.error(pce.getLocalizedMessage(), pce); |
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73 } |
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74 return null; |
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75 } |
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76 |
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77 public XPath newXPath() { |
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78 return newXPath(null); |
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79 } |
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80 |
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81 public XPath newXPath(NamespaceContext namespaceContext) { |
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82 XPathFactory factory = XPathFactory.newInstance(); |
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83 XPath xpath = factory.newXPath(); |
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84 if (namespaceContext != null) { |
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85 xpath.setNamespaceContext(namespaceContext); |
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86 } |
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87 return xpath; |
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88 } |
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89 |
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90 public Object xpath(Object root, String query, QName returnTyp) { |
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91 return xpath(root, query, returnTyp, null); |
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92 } |
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93 |
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94 public final String xpathString(Object root, String query, |
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95 NamespaceContext namespaceContext) { |
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96 return (String) xpath(root, query, XPathConstants.STRING, |
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97 namespaceContext); |
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98 } |
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99 |
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100 public static final Object xpath(Object root, String query, |
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101 QName returnType, NamespaceContext namespaceContext) { |
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102 if (root == null) { |
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103 return null; |
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104 } |
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105 |
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106 try { |
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107 XPath xpath = new XMLUtils().newXPath(namespaceContext); |
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108 if (xpath != null) { |
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109 return xpath.evaluate(query, root, returnType); |
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110 } |
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111 } catch (XPathExpressionException xpee) { |
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112 logger.error(xpee.getLocalizedMessage(), xpee); |
35 | 113 } |
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114 |
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115 return null; |
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116 } |
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117 |
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118 public Object getXPath(Object root, String query, QName returnType) { |
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119 return xpath(root, query, returnType); |
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120 } |
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121 |
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122 public String getStringXPath(String xpath) { |
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123 return getStringXPath(xpath, null); |
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124 } |
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125 |
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126 public NodeList getNodeSetXPath(Object root, String query) { |
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127 return (NodeList) getXPath(root, query, XPathConstants.NODESET); |
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128 } |
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129 |
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130 public Node getNodeXPath(Object root, String query) { |
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131 return (Node) getXPath(root, query, XPathConstants.NODE); |
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132 } |
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133 |
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134 public String getStringXPath(Object root, String xpath) { |
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135 return getStringXPath(root, xpath, null); |
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136 } |
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137 |
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138 public String getStringXPath(Object root, String query, String def) { |
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139 String s = (String) getXPath(root, query, XPathConstants.STRING); |
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140 return s == null || s.length() == 0 ? def : s; |
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141 } |
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142 |
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143 public Document readDocument(InputStream inputStream) { |
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144 Document returnValue = null; |
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145 try { |
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146 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory |
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147 .newInstance(); |
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148 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder(); |
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149 returnValue = docBuilder.parse(inputStream); |
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150 } catch (ParserConfigurationException e) { |
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151 logger.error(e, e); |
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152 } catch (SAXException e) { |
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153 logger.error(e, e); |
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154 } catch (IOException e) { |
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155 logger.error(e, e); |
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156 } |
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157 return returnValue; |
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158 } |
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159 |
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160 public String writeNode2String(Node node) { |
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161 try { |
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162 DOMSource source = new DOMSource(node); |
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163 return writeDOMSource2String(source); |
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164 } catch (TransformerConfigurationException e) { |
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165 logger.error(e, e); |
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166 } catch (TransformerFactoryConfigurationError e) { |
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167 logger.error(e, e); |
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168 } catch (TransformerException e) { |
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169 logger.error(e, e); |
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170 } |
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171 return null; |
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172 } |
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173 |
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174 public Document reInitDocument(Document document) { |
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175 |
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176 StringBufferInputStream inputStream = new StringBufferInputStream(this |
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177 .writeDocument2String(document)); |
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178 return this.readDocument(inputStream); |
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179 } |
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180 |
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181 public String writeDocument2String(Document document) { |
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182 try { |
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183 DOMSource source = new DOMSource(document); |
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184 return writeDOMSource2String(source); |
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185 } catch (TransformerConfigurationException e) { |
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186 logger.error(e, e); |
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187 } catch (TransformerFactoryConfigurationError e) { |
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188 logger.error(e, e); |
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189 } catch (TransformerException e) { |
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190 logger.error(e, e); |
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191 } |
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192 return null; |
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193 } |
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194 |
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195 /** |
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196 * @param source |
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197 * @return |
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198 * @throws TransformerFactoryConfigurationError |
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199 * @throws TransformerConfigurationException |
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200 * @throws TransformerException |
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201 */ |
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202 private String writeDOMSource2String(DOMSource source) |
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203 throws TransformerFactoryConfigurationError, |
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204 TransformerConfigurationException, TransformerException { |
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205 TransformerFactory transformerFactory = TransformerFactory |
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206 .newInstance(); |
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207 Transformer transformer = transformerFactory.newTransformer(); |
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208 StringWriter sw = new StringWriter(); |
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209 StreamResult result = new StreamResult(sw); |
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210 transformer.transform(source, result); |
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211 return sw.getBuffer().toString(); |
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212 } |
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213 } |
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214 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |