Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/util/XMLUtils.java @ 11:3cb753564552

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Integration of the required XSL-Transformation of the Describe-Response of the Artifactdatabase gnv/trunk@90 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 15 Sep 2009 14:19:55 +0000
parents 5e94403971af
children 4405f31bbc30
rev   line source
2
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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;
11
3cb753564552 Integration of the required XSL-Transformation of the Describe-Response of the Artifactdatabase
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5 import java.io.StringBufferInputStream;
2
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6 import java.io.StringWriter;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10 import org.w3c.dom.Attr;
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11 import org.w3c.dom.Node;
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12 import org.w3c.dom.NodeList;
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13 import org.xml.sax.SAXException;
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14
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15 import javax.xml.parsers.DocumentBuilder;
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16 import javax.xml.parsers.DocumentBuilderFactory;
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17
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18 import javax.xml.parsers.ParserConfigurationException;
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19 import javax.xml.transform.Transformer;
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20 import javax.xml.transform.TransformerConfigurationException;
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21 import javax.xml.transform.TransformerException;
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22 import javax.xml.transform.TransformerFactory;
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23 import javax.xml.transform.TransformerFactoryConfigurationError;
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24 import javax.xml.transform.dom.DOMSource;
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25 import javax.xml.transform.stream.StreamResult;
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26
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27 import org.apache.log4j.Logger;
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28
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29 import javax.xml.xpath.XPathFactory;
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30 import javax.xml.xpath.XPath;
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31 import javax.xml.xpath.XPathExpressionException;
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32 import javax.xml.xpath.XPathConstants;
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33
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34 import javax.xml.namespace.NamespaceContext;
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35 import javax.xml.namespace.QName;
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36
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37 /**
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38 * @author Sascha L. Teichmann
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39 */
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40 public class XMLUtils
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41 {
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42 private static Logger logger = Logger.getLogger(XMLUtils.class);
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43
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44 public XMLUtils() {
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45 }
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46
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47 public static class ElementCreator
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48 {
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49 protected Document document;
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50 protected String ns;
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51 protected String prefix;
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52
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53 public ElementCreator(Document document, String ns, String prefix) {
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54 this.document = document;
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55 this.ns = ns;
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56 this.prefix = prefix;
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57 }
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58
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59 public Element create(String name) {
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60 Element element = document.createElementNS(ns, name);
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61 element.setPrefix(prefix);
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62 return element;
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63 }
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64
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65 public void addAttr(Element element, String name, String value) {
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66 Attr attr = document.createAttributeNS(ns, name);
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67 attr.setValue(value);
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68 attr.setPrefix(prefix);
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69 element.setAttributeNode(attr);
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70 }
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71 } // class ElementCreator
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72
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73 public Document newDocument() {
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74 try {
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75 return DocumentBuilderFactory
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76 .newInstance()
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77 .newDocumentBuilder()
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78 .newDocument();
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79 }
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80 catch (ParserConfigurationException pce) {
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81 logger.error(pce.getLocalizedMessage(), pce);
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82 }
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83 return null;
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84 }
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85
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86 public XPath newXPath() {
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87 return newXPath(null);
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88 }
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89
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90 public XPath newXPath(NamespaceContext namespaceContext) {
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91 XPathFactory factory = XPathFactory.newInstance();
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92 XPath xpath = factory.newXPath();
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93 if (namespaceContext != null) {
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94 xpath.setNamespaceContext(namespaceContext);
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95 }
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96 return xpath;
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97 }
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98
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99 public Object xpath(Object root, String query, QName returnTyp) {
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100 return xpath(root, query, returnTyp, null);
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101 }
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102
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103 public final String xpathString(
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104 Object root, String query, NamespaceContext namespaceContext
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105 ) {
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106 return (String)xpath(root, query, XPathConstants.STRING, namespaceContext);
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107 }
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108
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109 public static final Object xpath(
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110 Object root,
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111 String query,
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112 QName returnType,
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113 NamespaceContext namespaceContext
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114 ) {
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115 if (root == null) {
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116 return null;
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117 }
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118
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119 try {
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120 XPath xpath = new XMLUtils().newXPath(namespaceContext);
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121 if (xpath != null) {
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122 return xpath.evaluate(query, root, returnType);
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123 }
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124 }
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125 catch (XPathExpressionException xpee) {
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126 logger.error(xpee.getLocalizedMessage(), xpee);
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127 }
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128
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129 return null;
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130 }
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131
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132 public Object getXPath(
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133 Object root, String query, QName returnType
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134 ) {
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135 return xpath(root, query, returnType);
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136 }
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137
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138 public String getStringXPath(String xpath) {
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139 return getStringXPath(xpath, null);
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140 }
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141
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142 public NodeList getNodeSetXPath(Object root, String query) {
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143 return (NodeList)getXPath(root, query, XPathConstants.NODESET);
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144 }
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145
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146 public Node getNodeXPath(Object root, String query) {
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147 return (Node)getXPath(root, query, XPathConstants.NODE);
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148 }
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149
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150 public String getStringXPath(Object root, String xpath) {
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151 return getStringXPath(root, xpath, null);
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152 }
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153
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154 public String getStringXPath(
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155 Object root, String query, String def
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156 ) {
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157 String s = (String)getXPath(root, query, XPathConstants.STRING);
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158 return s == null || s.length() == 0
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159 ? def
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160 : s;
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161 }
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162
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163 public Document readDocument(InputStream inputStream){
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164 Document returnValue = null;
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165 try {
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166 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
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167 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
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168 returnValue = docBuilder.parse (inputStream);
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169 } catch (ParserConfigurationException e) {
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170 logger.error(e,e);
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171 } catch (SAXException e) {
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172 logger.error(e,e);
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173 } catch (IOException e) {
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174 logger.error(e,e);
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175 }
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176 return returnValue;
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177 }
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178
11
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179 public String writeNode2String(Node node){
2
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180 try {
11
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181 DOMSource source = new DOMSource(node);
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182 return writeDOMSource2String(source);
2
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183 } catch (TransformerConfigurationException e) {
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184 logger.error(e,e);
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185 } catch (TransformerFactoryConfigurationError e) {
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186 logger.error(e,e);
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187 } catch (TransformerException e) {
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188 logger.error(e,e);
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189 }
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190 return null;
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191 }
11
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192
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193 public Document reInitDocument(Document document){
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194
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195 StringBufferInputStream inputStream = new StringBufferInputStream(this.writeDocument2String(document));
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196 return this.readDocument(inputStream);
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197 }
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198
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199
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200 public String writeDocument2String(Document document){
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201 try {
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202 DOMSource source = new DOMSource(document);
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203 return writeDOMSource2String(source);
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204 } catch (TransformerConfigurationException e) {
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205 logger.error(e,e);
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206 } catch (TransformerFactoryConfigurationError e) {
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207 logger.error(e,e);
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208 } catch (TransformerException e) {
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209 logger.error(e,e);
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210 }
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211 return null;
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212 }
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213
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214 /**
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215 * @param source
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216 * @return
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217 * @throws TransformerFactoryConfigurationError
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218 * @throws TransformerConfigurationException
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219 * @throws TransformerException
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220 */
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221 private String writeDOMSource2String(DOMSource source)
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222 throws TransformerFactoryConfigurationError,
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223 TransformerConfigurationException, TransformerException {
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224 TransformerFactory transformerFactory = TransformerFactory.newInstance();
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225 Transformer transformer = transformerFactory.newTransformer();
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226 StringWriter sw = new StringWriter();
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227 StreamResult result = new StreamResult(sw);
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228 transformer.transform(source, result);
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229 return sw.getBuffer().toString();
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230 }
2
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231 }
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232 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org