Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/util/XMLUtils.java @ 38:fccf90761825

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Format Code to max 80 Chars per Row better Formatter choosen gnv/trunk@174 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Fri, 02 Oct 2009 09:10:36 +0000
parents ad381cc47217
children 416ff31f6273
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
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8 import javax.xml.namespace.NamespaceContext;
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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;
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20 import javax.xml.xpath.XPath;
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21 import javax.xml.xpath.XPathConstants;
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22 import javax.xml.xpath.XPathExpressionException;
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23 import javax.xml.xpath.XPathFactory;
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24
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25 import org.apache.log4j.Logger;
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26 import org.w3c.dom.Attr;
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27 import org.w3c.dom.Document;
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28 import org.w3c.dom.Element;
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29 import org.w3c.dom.Node;
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30 import org.w3c.dom.NodeList;
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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,
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102 NamespaceContext namespaceContext) {
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103 if (root == null) {
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104 return null;
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105 }
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106
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107 try {
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108 XPath xpath = new XMLUtils().newXPath(namespaceContext);
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109 if (xpath != null) {
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110 return xpath.evaluate(query, root, returnType);
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111 }
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112 } catch (XPathExpressionException xpee) {
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113 logger.error(xpee.getLocalizedMessage(), xpee);
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114 }
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115
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116 return null;
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117 }
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118
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119 public Object getXPath(Object root, String query, QName returnType) {
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120 return xpath(root, query, returnType);
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121 }
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122
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123 public String getStringXPath(String xpath) {
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124 return getStringXPath(xpath, null);
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125 }
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126
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127 public NodeList getNodeSetXPath(Object root, String query) {
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128 return (NodeList) getXPath(root, query, XPathConstants.NODESET);
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129 }
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130
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131 public Node getNodeXPath(Object root, String query) {
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132 return (Node) getXPath(root, query, XPathConstants.NODE);
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133 }
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134
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135 public String getStringXPath(Object root, String xpath) {
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136 return getStringXPath(root, xpath, null);
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137 }
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138
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139 public String getStringXPath(Object root, String query, String def) {
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140 String s = (String) getXPath(root, query, XPathConstants.STRING);
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141 return s == null || s.length() == 0 ? def : s;
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142 }
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143
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144 public Document readDocument(InputStream inputStream) {
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145 Document returnValue = null;
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146 try {
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147 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
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148 .newInstance();
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149 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
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150 returnValue = docBuilder.parse(inputStream);
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151 } catch (ParserConfigurationException e) {
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152 logger.error(e, e);
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153 } catch (SAXException e) {
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154 logger.error(e, e);
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155 } catch (IOException e) {
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156 logger.error(e, e);
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157 }
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158 return returnValue;
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159 }
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160
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161 public String writeNode2String(Node node) {
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162 try {
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163 DOMSource source = new DOMSource(node);
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164 return writeDOMSource2String(source);
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165 } catch (TransformerConfigurationException e) {
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166 logger.error(e, e);
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167 } catch (TransformerFactoryConfigurationError e) {
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168 logger.error(e, e);
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169 } catch (TransformerException e) {
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170 logger.error(e, e);
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171 }
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172 return null;
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173 }
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174
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175 public Document reInitDocument(Document document) {
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176
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177 StringBufferInputStream inputStream = new StringBufferInputStream(this
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178 .writeDocument2String(document));
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179 return this.readDocument(inputStream);
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180 }
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181
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182 public String writeDocument2String(Document document) {
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183 try {
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184 DOMSource source = new DOMSource(document);
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185 return writeDOMSource2String(source);
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186 } catch (TransformerConfigurationException e) {
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187 logger.error(e, e);
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188 } catch (TransformerFactoryConfigurationError e) {
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189 logger.error(e, e);
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190 } catch (TransformerException e) {
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191 logger.error(e, e);
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192 }
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193 return null;
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194 }
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195
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196 /**
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197 * @param source
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198 * @return
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199 * @throws TransformerFactoryConfigurationError
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200 * @throws TransformerConfigurationException
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201 * @throws TransformerException
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202 */
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203 private String writeDOMSource2String(DOMSource source)
38
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204 throws TransformerFactoryConfigurationError,
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205 TransformerConfigurationException,
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206 TransformerException {
36
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207 TransformerFactory transformerFactory = TransformerFactory
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208 .newInstance();
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209 Transformer transformer = transformerFactory.newTransformer();
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210 StringWriter sw = new StringWriter();
36
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211 StreamResult result = new StreamResult(sw);
11
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212 transformer.transform(source, result);
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213 return sw.getBuffer().toString();
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214 }
2
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215 }
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216 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org