Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/util/XMLUtils.java @ 964:3549253ecd7b

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Fixed some warnings which were displaied during the javadoc-generation gnv/trunk@1108 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 18 May 2010 11:14:09 +0000
parents e7fda0ae8b92
children 28a0628b11b0
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.OutputStream;
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6 import java.io.StringBufferInputStream;
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7 import java.io.StringWriter;
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8
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9 import javax.xml.namespace.NamespaceContext;
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10 import javax.xml.namespace.QName;
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11 import javax.xml.parsers.DocumentBuilder;
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12 import javax.xml.parsers.DocumentBuilderFactory;
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13 import javax.xml.parsers.ParserConfigurationException;
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14 import javax.xml.transform.Transformer;
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15 import javax.xml.transform.TransformerConfigurationException;
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16 import javax.xml.transform.TransformerException;
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17 import javax.xml.transform.TransformerFactory;
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18 import javax.xml.transform.TransformerFactoryConfigurationError;
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19 import javax.xml.transform.dom.DOMSource;
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20 import javax.xml.transform.stream.StreamResult;
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21 import javax.xml.xpath.XPath;
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22 import javax.xml.xpath.XPathConstants;
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23 import javax.xml.xpath.XPathExpressionException;
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24 import javax.xml.xpath.XPathFactory;
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25
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26 import org.apache.log4j.Logger;
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27 import org.w3c.dom.Attr;
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28 import org.w3c.dom.Document;
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29 import org.w3c.dom.Element;
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30 import org.w3c.dom.Node;
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31 import org.w3c.dom.NodeList;
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32 import org.xml.sax.SAXException;
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33
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34 /**
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35 * This class provides many helper-Methods for handling different kinds of
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36 * XML-stuff.
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37 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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38 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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39 */
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40 public class XMLUtils {
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41
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42 /**
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43 * the logger, used to log exceptions and additonaly information
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44 */
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45 private static Logger logger = Logger.getLogger(XMLUtils.class);
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46
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47 /**
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48 * Constructor
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49 */
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50 public XMLUtils() {
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51 }
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52
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53 /**
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54 * Class which could be used to create XML-Elements
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55 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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56 *
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57 */
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58 public static class ElementCreator {
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59
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60 /**
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61 * The document the elements should be placed in.
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62 */
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63 protected Document document;
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64
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65 /**
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66 * The namespace that should be used.
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67 */
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68 protected String ns;
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69
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70 /**
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71 * The prefix of the namespace that should be used.
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72 */
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73 protected String prefix;
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74
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75 /**
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76 * Constructor
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77 * @param document the document the elements should be placed in
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78 * @param ns the namespace that should be used
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79 * @param prefix the prefix of the namespace that should be used
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80 */
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81 public ElementCreator(Document document, String ns, String prefix) {
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82 this.document = document;
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83 this.ns = ns;
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84 this.prefix = prefix;
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85 }
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86
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87 /**
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88 * Creates a new element using the given name.
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89 * @param name the name of the new element.
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90 * @return the new element
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91 */
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92 public Element create(String name) {
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93 Element element = document.createElementNS(ns, name);
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94 element.setPrefix(prefix);
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95 return element;
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96 }
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97
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98 /**
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99 * Adds a new attribute to the given element.
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100 * @param element the element where the attribute should be placed in.
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101 * @param name the name of the attribute
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102 * @param value the value of the attribute
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103 */
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104 public void addAttr(Element element, String name, String value) {
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105 Attr attr = document.createAttributeNS(ns, name);
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106 attr.setValue(value);
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107 attr.setPrefix(prefix);
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108 element.setAttributeNode(attr);
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109 }
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110 } // class ElementCreator
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111
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112 /**
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113 * Creates a new document.
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114 * @return the new document
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115 */
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116 public static Document newDocument() {
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117 try {
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118 return DocumentBuilderFactory.newInstance().newDocumentBuilder()
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119 .newDocument();
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120 } catch (ParserConfigurationException pce) {
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121 logger.error(pce.getLocalizedMessage(), pce);
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122 }
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123 return null;
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124 }
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125
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126 /**
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127 * Creates a new <code>XPath</code>-expression
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128 * @return the new <code>XPath</code>-expression
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129 */
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130 public static XPath newXPath() {
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131 return newXPath(null);
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132 }
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133
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134 /**
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135 * Creates a new <code>XPath</code>-expression
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136 * @param namespaceContext the namespacecontext that should be used.
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137 * @return the new <code>XPath</code>-expression
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138 */
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139 public static XPath newXPath(NamespaceContext namespaceContext) {
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140 XPathFactory factory = XPathFactory.newInstance();
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141 XPath xpath = factory.newXPath();
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142 if (namespaceContext != null) {
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143 xpath.setNamespaceContext(namespaceContext);
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144 }
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145 return xpath;
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146 }
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147
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148 /**
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149 * Fetch the value of an element or attribute from the given resource
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150 * using the query.
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151 * @param root the source where the value should be fetch from
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152 * @param query the query that should be used to fetch the value
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153 * @param namespaceContext the namespacecontext that must match to
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154 * fetch the value.
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155 * @return the value
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156 */
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157 public static final String xpathString(Object root, String query,
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158 NamespaceContext namespaceContext) {
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159 return (String) xpath(root, query, XPathConstants.STRING,
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160 namespaceContext);
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161 }
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162
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163 /**
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164 * Fetch the object rom the given resource using the query.
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165 * @param root the source where the value should be fetch from
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166 * @param query the query that should be used to fetch the object
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167 * @param returnType the Type that must be used to return the object,
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168 * @param namespaceContext the namespacecontext that must match to
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169 * fetch the object.
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170 * @return the value
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171 */
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172 public static final Object xpath(Object root, String query,
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173 QName returnType,
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174 NamespaceContext namespaceContext) {
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175 if (root == null) {
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176 return null;
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177 }
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178 try {
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179 XPath xpath = XMLUtils.newXPath(namespaceContext);
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180 if (xpath != null) {
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181 return xpath.evaluate(query, root, returnType);
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182 }
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183 } catch (XPathExpressionException xpee) {
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184 logger.error(xpee.getLocalizedMessage(), xpee);
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185 }
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186 return null;
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187 }
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188
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189 /**
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190 * Fetch the object rom the given resource using the query
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191 * and the default <code>ArtifactNamespaceContext</code>
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192 * @param root the source where the value should be fetch from
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193 * @param query the query that should be used to fetch the object
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194 * @param returnType the Type that must be used to return the object
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195 * @return the value
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196 */
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197 public static Object getXPath(Object root, String query, QName returnType) {
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198 return getXPath(root,query,returnType,ArtifactNamespaceContext.INSTANCE);
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199 }
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200
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201 /**
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202 * Fetch the object rom the given resource using the query
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203 * and the default <code>ArtifactNamespaceContext</code>
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204 * @param root the source where the value should be fetch from
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205 * @param query the query that should be used to fetch the object
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206 * @param returnType the Type that must be used to return the object.
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207 * @param context the namespacecontext that must match to
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208 * fetch the object.
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209 * @return the value
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210 */
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211 public static Object getXPath(
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212 Object root, String query, QName returnType, NamespaceContext context
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213 ) {
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214 return xpath(root, query, returnType, context);
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215 }
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216
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217 /**
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218 * Fetch a Nodeset value from a XML-Fragment or XML-Document using the
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219 * given query.
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220 * @param root the source where the String should be fetched from
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221 * @param query the query that should be used,
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222 * @return the Nodeset fetched from the source
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223 */
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224 public static NodeList getNodeSetXPath(Object root, String query) {
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225 return (NodeList) getXPath(root, query, XPathConstants.NODESET);
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226 }
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227
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228 /**
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229 * Fetch a Node from a XML-Fragment or XML-Document using the
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230 * given query.
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231 * @param root the source where the Node should be fetched from
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232 * @param query the query that should be used,
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233 * @return the Node fetched from the source
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234 */
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235 public static Node getNodeXPath(Object root, String query) {
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236 return (Node) getXPath(root, query, XPathConstants.NODE);
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237 }
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238
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239 /**
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240 * Fetch a String value from a XML-Fragment or XML-Document using the
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241 * given query.
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242 * @param root the source where the String should be fetched from
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243 * @param xpath the query that should be used,
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244 * @return the String fetched from the source
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245 */
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246 public static String getStringXPath(Object root, String xpath) {
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247 return getStringXPath(root, xpath, null);
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248 }
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249
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250 /**
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251 * Fetch a String value from a XML-Fragment or XML-Document using the
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252 * given query.
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253 * @param root the source where the String should be fetched from
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254 * @param query the query that should be used,
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255 * @param def the default-value that will be returned id no value was found
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256 * @return the String fetched from the source
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257 */
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258 public static String getStringXPath(Object root, String query, String def) {
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259 String s = (String) getXPath(root, query, XPathConstants.STRING);
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260 return s == null || s.length() == 0 ? def : s;
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261 }
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262
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263 /**
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264 * Reads an XML-document from a given <code>InputStream</code>
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265 * @param inputStream the <code>InputStream</code> where the document
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266 * should be read from
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267 * @return the document that could be read.
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268 */
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269 public static Document readDocument(InputStream inputStream) {
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270 Document returnValue = null;
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271 try {
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272 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
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273 .newInstance();
389
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274 docBuilderFactory.setNamespaceAware(true);
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275 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
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276 returnValue = docBuilder.parse(inputStream);
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277 } catch (ParserConfigurationException e) {
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278 logger.error(e, e);
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279 } catch (SAXException e) {
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280 logger.error(e, e);
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281 } catch (IOException e) {
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282 logger.error(e, e);
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283 }
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284 return returnValue;
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285 }
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286
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287 /**
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288 * Writes an single <code>XML-Node</code> to a string
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289 * @param node the <code>XML-Node</code> that should be written
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290 * @return the encoded <code>XML-Node</code>
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291 */
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292 public static String writeNode2String(Node node) {
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293 try {
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294 DOMSource source = new DOMSource(node);
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295 return writeDOMSource2String(source);
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296 } catch (TransformerConfigurationException e) {
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297 logger.error(e, e);
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298 } catch (TransformerFactoryConfigurationError e) {
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299 logger.error(e, e);
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300 } catch (TransformerException e) {
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301 logger.error(e, e);
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302 }
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303 return null;
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304 }
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305
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306 /**
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307 * Reinitialize the doument.
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308 * This is neccessary because the namespace sometimes is invalid
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309 * using a document which was created and used in the same step.
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310 * @param document the document which should be reinitialize
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311 * @return the document
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312 */
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313 public static Document reInitDocument(Document document) {
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314 StringBufferInputStream inputStream = new StringBufferInputStream(
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315 writeDocument2String(document));
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316 return readDocument(inputStream);
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317 }
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318
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319 /**
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320 * Writes the given Document into a String.
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321 * This is very helpful for debugging.
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322 * @param document the document which should be written to the string.
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323 * @return the encoded xml-document.
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324 */
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325 public static String writeDocument2String(Document document) {
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326 try {
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327 DOMSource source = new DOMSource(document);
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328 return writeDOMSource2String(source);
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329 } catch (TransformerConfigurationException e) {
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330 logger.error(e, e);
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331 } catch (TransformerFactoryConfigurationError e) {
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332 logger.error(e, e);
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333 } catch (TransformerException e) {
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334 logger.error(e, e);
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335 }
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336 return null;
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337 }
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338
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339 /**
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340 * Writes a given <code>DOMSource</code> into a String
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341 * @param source the source that should be written to string
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342 * @return the encoded <code>DOMSource</code>
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343 * @throws TransformerFactoryConfigurationError
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344 * @throws TransformerConfigurationException
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345 * @throws TransformerException
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346 */
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347 private static String writeDOMSource2String(DOMSource source)
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348 throws TransformerFactoryConfigurationError,
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349 TransformerConfigurationException,
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350 TransformerException {
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351 TransformerFactory transformerFactory = TransformerFactory
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352 .newInstance();
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353 Transformer transformer = transformerFactory.newTransformer();
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354 StringWriter sw = new StringWriter();
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355 StreamResult result = new StreamResult(sw);
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356 transformer.transform(source, result);
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357 return sw.getBuffer().toString();
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358 }
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359
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360 /**
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361 * Writes a given Document to an <code>OutputStream</code>
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362 * @param document the document that should be written
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363 * @param out the stream where the document should be written to,
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364 * @return true if it was successful, false if not.
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365 */
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366 public static boolean toStream(Document document, OutputStream out) {
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367 try {
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368 Transformer transformer =
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369 TransformerFactory.newInstance().newTransformer();
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370 DOMSource source = new DOMSource(document);
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371 StreamResult result = new StreamResult(out);
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372 transformer.transform(source, result);
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373 return true;
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374 }
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375 catch (TransformerConfigurationException tce) {
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376 logger.error(tce.getLocalizedMessage(), tce);
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377 }
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378 catch (TransformerFactoryConfigurationError tfce) {
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379 logger.error(tfce.getLocalizedMessage(), tfce);
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380 }
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381 catch (TransformerException te) {
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382 logger.error(te.getLocalizedMessage(), te);
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383 }
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384 return false;
681
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385 }
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386 }
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387 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org