Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/ArtifactXMLUtilities.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.utils;
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10
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11 import java.io.ByteArrayInputStream;
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12 import java.io.IOException;
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13 import java.io.InputStream;
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14 import java.io.Serializable;
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15 import java.io.StringWriter;
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16 import java.io.UnsupportedEncodingException;
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17
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18 import javax.xml.parsers.DocumentBuilder;
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19 import javax.xml.parsers.DocumentBuilderFactory;
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20 import javax.xml.parsers.ParserConfigurationException;
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21 import javax.xml.transform.Transformer;
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22 import javax.xml.transform.TransformerConfigurationException;
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23 import javax.xml.transform.TransformerException;
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24 import javax.xml.transform.TransformerFactory;
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25 import javax.xml.transform.TransformerFactoryConfigurationError;
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26 import javax.xml.transform.dom.DOMSource;
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27 import javax.xml.transform.stream.StreamResult;
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28
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29 import org.apache.log4j.Logger;
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30 import org.w3c.dom.Document;
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31 import org.w3c.dom.Element;
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32 import org.w3c.dom.Node;
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33 import org.xml.sax.SAXException;
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34
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35 import de.intevation.artifacts.ArtifactNamespaceContext;
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36
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37 /**
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38 * This class provides some methods for creating and working with xml documents.
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39 *
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40 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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41 *
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42 */
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43 public class ArtifactXMLUtilities implements Serializable {
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44 /**
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45 *
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46 */
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47 private static final long serialVersionUID = -6236340358303411758L;
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48
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49 /**
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50 * the logger, used to log exceptions and additonaly information
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51 */
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52 private static Logger log = Logger
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53 .getLogger(ArtifactXMLUtilities.class);
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54
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55 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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56 public static final String XFORM_PREFIX = "xform";
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57
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58 /**
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59 * Constructor.<br>
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60 * <b>Note:</b> It should not be necessary to create an object of this
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61 * class - which is a helper class. Call static methods instead.
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62 */
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63 public ArtifactXMLUtilities() {
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64 }
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65
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66 /**
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67 * Creates an <code>Element</code> and returns it.
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68 *
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69 * @param document A document
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70 * @param name Name of a node.
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71 * @return an Element.
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72 */
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73 public static Element createArtifactElement(Document document, String name) {
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74 Element node = document.createElementNS(
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75 ArtifactNamespaceContext.NAMESPACE_URI, name);
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76 node.setPrefix(ArtifactNamespaceContext.NAMESPACE_PREFIX);
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77 return node;
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78 }
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81 /**
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82 * Turns an xml document into a string.
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83 *
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84 * @param document An xml document.
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85 * @return String representation of <i>document</i>.
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86 */
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87 public static String writeDocument2String(Document document) {
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88 try {
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89 TransformerFactory transformerFactory = TransformerFactory
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90 .newInstance();
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91 Transformer transformer = transformerFactory.newTransformer();
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92 DOMSource source = new DOMSource(document);
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93 StringWriter sw = new StringWriter();
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94 StreamResult result = new StreamResult(sw);
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95 transformer.transform(source, result);
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96 return sw.getBuffer().toString();
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97 } catch (TransformerConfigurationException e) {
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98 log.error(e, e);
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99 } catch (TransformerFactoryConfigurationError e) {
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100 log.error(e, e);
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101 } catch (TransformerException e) {
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102 log.error(e, e);
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103 }
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104 return null;
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105 }
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106
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107 /**
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108 * Read a document from input stream.
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109 *
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110 * @param inputStream The input stream.
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111 * @return the document read from stream.
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112 */
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113 public static Document readDocument(InputStream inputStream) {
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114 Document returnValue = null;
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115 try {
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116 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
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117 .newInstance();
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118 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
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119 returnValue = docBuilder.parse(inputStream);
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120 } catch (ParserConfigurationException e) {
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121 log.error(e, e);
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122 } catch (SAXException e) {
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123 log.error(e, e);
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124 } catch (IOException e) {
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125 log.error(e, e);
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126 }
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127 return returnValue;
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128 }
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129
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130
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131 public Document reInitDocument(Document document) {
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132 try {
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133 byte[] barray = ArtifactXMLUtilities.writeDocument2String(document).getBytes(
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134 "UTF-8");
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135 InputStream inputStream = new ByteArrayInputStream(barray);
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136 return ArtifactXMLUtilities.readDocument(inputStream);
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137 } catch (UnsupportedEncodingException e) {
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138 log.error(e, e);
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139 }
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140 return document;
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141 }
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142
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143
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144 /**
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145 * Creates an <code>Element</code> with {@link #XFORM_PREFIX} and <i>name
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146 * </i>.
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147 *
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148 * @param document A document.
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149 * @param name The node name.
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150 * @return the created element.
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151 */
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152 public static Element createXFormElement(Document document, String name) {
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153 Element node = document.createElementNS(XFORM_URL, name);
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154 node.setPrefix(XFORM_PREFIX);
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155 return node;
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156 }
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157
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158 /**
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159 * Creates an exception node.
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160 *
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161 * @param message The message in the node.
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162 * @param document A document.
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163 * @return the document containing the exception node.
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164 */
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165 public static Document createExceptionReport(String message, Document document) {
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166 log.debug("ArtifactXMLUtilities.createExceptionReport");
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167 Element exceptionReportNode = createArtifactElement(document,
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168 "exceptionreport");
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169 document.appendChild(exceptionReportNode);
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170 Element exceptionNode = createArtifactElement(document,
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171 "exception");
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172 exceptionNode.setTextContent(message);
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173 exceptionReportNode.appendChild(exceptionNode);
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174 return document;
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175 }
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176
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177 /**
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178 * Creates an input exception node.
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179 *
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180 * @param msg The message in the node.
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181 * @param doc A document.
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182 * @return the document containing the exception node.
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183 */
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184 public static Document createInputExceptionReport(String msg, Document doc) {
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185 Element exceptionReportNode = createArtifactElement(
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186 doc,"exceptionreport");
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187 Element exceptionNode = createArtifactElement(
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188 doc,"exception");
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189 Element inputNode = createArtifactElement(
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190 doc, "input");
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191 inputNode.setTextContent(msg);
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192 exceptionNode.appendChild(inputNode);
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193 exceptionReportNode.appendChild(exceptionNode);
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194 doc.appendChild(exceptionReportNode);
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195 return doc;
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196 }
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197
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198 /**
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199 * Creates a success node.
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200 *
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201 * @param message The message.
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202 * @param document A document.
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203 * @return the document containing the success node.
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204 */
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205 public static Document createSuccessReport(String message, Document document) {
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206 log.debug("ArtifactXMLUtilities.creatSuccessReport");
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207 Element reportNode = createArtifactElement(document, "result");
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208 document.appendChild(reportNode);
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209 Element successNode = createArtifactElement(document, "success");
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210 successNode.setTextContent(message);
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211 reportNode.appendChild(successNode);
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212 return document;
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213 }
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214
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215 /**
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216 * Read <i>fileName</i> and return the first child node.
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217 *
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218 * @param fileName An xml document.
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219 * @return the first child node in this document.
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220 */
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221 public Node readConfiguration(String fileName){
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222 try {
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223 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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224 factory.setValidating(false);
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225 return factory.newDocumentBuilder().parse(fileName).getChildNodes().item(0);
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226 } catch (SAXException e) {
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227 log.error(e,e);
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228 return null;
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229 } catch (IOException e) {
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230 log.error(e,e);
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231 return null;
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232 } catch (ParserConfigurationException e) {
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233 log.error(e,e);
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234 return null;
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235 }
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236 }
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237 }
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238 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org