Mercurial > dive4elements > river
annotate etl/src/main/java/org/dive4elements/river/etl/utils/XML.java @ 7289:015e12aac2dc
issue1512: Adjusted Q and WOutProcessors to handle data
coming from FlowVelocityMeasurementArtifacts.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 11 Oct 2013 12:12:52 +0200 |
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children | 0a5239a1e46e |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.etl.utils; |
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10 |
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11 import java.io.BufferedInputStream; |
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12 import java.io.File; |
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13 import java.io.FileInputStream; |
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14 import java.io.IOException; |
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15 import java.io.InputStream; |
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16 import java.io.OutputStream; |
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17 import java.io.StringWriter; |
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18 |
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19 import java.util.HashMap; |
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20 import java.util.Map; |
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21 |
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22 import javax.xml.namespace.NamespaceContext; |
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23 import javax.xml.namespace.QName; |
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24 |
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25 import javax.xml.parsers.DocumentBuilderFactory; |
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26 import javax.xml.parsers.ParserConfigurationException; |
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27 |
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28 import javax.xml.transform.Transformer; |
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29 import javax.xml.transform.TransformerConfigurationException; |
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30 import javax.xml.transform.TransformerException; |
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31 import javax.xml.transform.TransformerFactory; |
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32 import javax.xml.transform.TransformerFactoryConfigurationError; |
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33 |
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34 import javax.xml.transform.dom.DOMResult; |
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35 import javax.xml.transform.dom.DOMSource; |
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36 |
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37 import javax.xml.transform.stream.StreamResult; |
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38 import javax.xml.transform.stream.StreamSource; |
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39 |
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40 import javax.xml.xpath.XPath; |
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41 import javax.xml.xpath.XPathExpressionException; |
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42 import javax.xml.xpath.XPathFactory; |
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43 import javax.xml.xpath.XPathVariableResolver; |
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44 |
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45 import org.apache.log4j.Logger; |
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46 |
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47 import org.w3c.dom.Document; |
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48 |
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49 import org.xml.sax.SAXException; |
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50 |
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51 public final class XML |
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52 { |
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53 /** Logger for this class. */ |
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54 private static Logger log = Logger.getLogger(XML.class); |
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55 |
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56 public static class MapXPathVariableResolver |
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57 implements XPathVariableResolver |
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58 { |
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59 protected Map<String, String> variables; |
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60 |
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61 |
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62 public MapXPathVariableResolver() { |
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63 this.variables = new HashMap<String, String>(); |
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64 } |
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65 |
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66 |
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67 public MapXPathVariableResolver(Map<String, String> variables) { |
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68 this.variables = variables; |
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69 } |
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70 |
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71 |
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72 public void addVariable(String name, String value) { |
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73 variables.put(name, value); |
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74 } |
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75 |
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76 |
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77 @Override |
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78 public Object resolveVariable(QName variableName) { |
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79 String key = variableName.getLocalPart(); |
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80 return variables.get(key); |
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81 } |
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82 } // class MapXPathVariableResolver |
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83 |
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84 private XML() { |
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85 } |
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86 |
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87 /** |
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88 * Creates a new XML document |
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89 * @return the new XML document ot null if something went wrong during |
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90 * creation. |
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91 */ |
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92 public static final Document newDocument() { |
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93 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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94 factory.setNamespaceAware(true); |
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95 |
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96 try { |
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97 return factory.newDocumentBuilder().newDocument(); |
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98 } |
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99 catch (ParserConfigurationException pce) { |
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100 log.error(pce.getLocalizedMessage(), pce); |
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101 } |
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102 return null; |
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103 } |
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104 |
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105 /** |
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106 * Loads a XML document namespace aware from a file |
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107 * @param file The file to load. |
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108 * @return the XML document or null if something went wrong |
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109 * during loading. |
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110 */ |
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111 public static final Document parseDocument(File file) { |
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112 return parseDocument(file, Boolean.TRUE); |
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113 } |
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114 |
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115 public static final Document parseDocument(File file, Boolean namespaceAware) { |
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116 InputStream inputStream = null; |
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117 try { |
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118 inputStream = new BufferedInputStream(new FileInputStream(file)); |
4072
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119 return parseDocument(inputStream, namespaceAware); |
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120 } |
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121 catch (IOException ioe) { |
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122 log.error(ioe.getLocalizedMessage(), ioe); |
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123 } |
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124 finally { |
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125 if (inputStream != null) { |
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126 try { inputStream.close(); } |
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127 catch (IOException ioe) {} |
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128 } |
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129 } |
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130 return null; |
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131 } |
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132 |
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133 |
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134 public static final Document parseDocument(InputStream inputStream) { |
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135 return parseDocument(inputStream, Boolean.TRUE); |
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136 } |
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137 |
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138 public static final Document parseDocument( |
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139 InputStream inputStream, |
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140 Boolean namespaceAware |
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141 ) { |
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142 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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143 |
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144 if (namespaceAware != null) { |
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145 factory.setNamespaceAware(namespaceAware.booleanValue()); |
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146 } |
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147 |
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148 try { |
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149 return factory.newDocumentBuilder().parse(inputStream); |
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150 } |
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151 catch (ParserConfigurationException pce) { |
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152 log.error(pce.getLocalizedMessage(), pce); |
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153 } |
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154 catch (SAXException se) { |
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155 log.error(se.getLocalizedMessage(), se); |
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156 } |
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157 catch (IOException ioe) { |
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158 log.error(ioe.getLocalizedMessage(), ioe); |
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159 } |
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160 return null; |
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161 } |
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162 |
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163 |
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164 /** |
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165 * Creates a new XPath without a namespace context. |
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166 * @return the new XPath. |
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167 */ |
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168 public static final XPath newXPath() { |
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169 return newXPath(null, null); |
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170 } |
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171 |
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172 /** |
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173 * Creates a new XPath with a given namespace context. |
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174 * @param namespaceContext The namespace context to be used or null |
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175 * if none should be used. |
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176 * @return The new XPath |
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177 */ |
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178 public static final XPath newXPath( |
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179 NamespaceContext namespaceContext, |
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180 XPathVariableResolver resolver) |
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181 { |
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182 XPathFactory factory = XPathFactory.newInstance(); |
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183 XPath xpath = factory.newXPath(); |
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184 if (namespaceContext != null) { |
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185 xpath.setNamespaceContext(namespaceContext); |
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186 } |
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187 |
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188 if (resolver != null) { |
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189 xpath.setXPathVariableResolver(resolver); |
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190 } |
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191 return xpath; |
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192 } |
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193 |
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194 /** |
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195 * Evaluates an XPath query on a given object and returns the result |
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196 * as a given type. No namespace context is used. |
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197 * @param root The object which is used as the root of the tree to |
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198 * be searched in. |
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199 * @param query The XPath query |
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200 * @param returnTyp The type of the result. |
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201 * @return The result of type 'returnTyp' or null if something |
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202 * went wrong during XPath evaluation. |
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203 */ |
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204 public static final Object xpath( |
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205 Object root, |
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|
206 String query, |
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|
207 QName returnTyp |
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|
208 ) { |
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209 return xpath(root, query, returnTyp, null); |
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210 } |
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211 |
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|
212 /** |
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213 * Evaluates an XPath query on a given object and returns the result |
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214 * as a given type. Optionally a namespace context is used. |
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215 * @param root The object which is used as the root of the tree to |
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|
216 * be searched in. |
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|
217 * @param query The XPath query |
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218 * @param returnType The type of the result. |
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219 * @param namespaceContext The namespace context to be used or null |
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220 * if none should be used. |
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221 * @return The result of type 'returnTyp' or null if something |
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222 * went wrong during XPath evaluation. |
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|
223 */ |
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|
224 public static final Object xpath( |
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225 Object root, |
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|
226 String query, |
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|
227 QName returnType, |
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|
228 NamespaceContext namespaceContext |
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|
229 ) { |
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230 return xpath(root, query, returnType, namespaceContext, null); |
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|
231 } |
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|
232 |
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|
233 public static final Object xpath( |
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|
234 Object root, |
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|
235 String query, |
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|
236 QName returnType, |
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|
237 NamespaceContext namespaceContext, |
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|
238 Map<String, String> variables) |
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|
239 { |
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|
240 if (root == null) { |
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|
241 return null; |
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242 } |
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243 |
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244 XPathVariableResolver resolver = variables != null |
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245 ? new MapXPathVariableResolver(variables) |
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246 : null; |
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247 |
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248 try { |
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249 XPath xpath = newXPath(namespaceContext, resolver); |
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250 if (xpath != null) { |
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251 return xpath.evaluate(query, root, returnType); |
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252 } |
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253 } |
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254 catch (XPathExpressionException xpee) { |
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255 log.error(xpee.getLocalizedMessage(), xpee); |
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256 } |
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257 |
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258 return null; |
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259 } |
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260 |
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261 public static Document transform( |
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262 Document document, |
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263 File xformFile |
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264 ) { |
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265 try { |
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266 Transformer transformer = |
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267 TransformerFactory |
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268 .newInstance() |
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269 .newTransformer( |
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270 new StreamSource(xformFile)); |
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271 |
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272 DOMResult result = new DOMResult(); |
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273 |
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274 transformer.transform(new DOMSource(document), result); |
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275 |
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276 return (Document)result.getNode(); |
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277 } |
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278 catch (TransformerConfigurationException tce) { |
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279 log.error(tce, tce); |
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280 } |
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281 catch (TransformerException te) { |
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282 log.error(te, te); |
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283 } |
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284 |
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285 return null; |
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286 } |
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287 |
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288 /** |
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289 * Streams out an XML document to a given output stream. |
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290 * @param document The document to be streamed out. |
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291 * @param out The output stream to be used. |
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292 * @return true if operation succeeded else false. |
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293 */ |
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294 public static boolean toStream(Document document, OutputStream out) { |
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295 try { |
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296 Transformer transformer = |
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297 TransformerFactory.newInstance().newTransformer(); |
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298 DOMSource source = new DOMSource(document); |
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299 StreamResult result = new StreamResult(out); |
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300 transformer.transform(source, result); |
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301 return true; |
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302 } |
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303 catch (TransformerConfigurationException tce) { |
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304 log.error(tce.getLocalizedMessage(), tce); |
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305 } |
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306 catch (TransformerFactoryConfigurationError tfce) { |
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307 log.error(tfce.getLocalizedMessage(), tfce); |
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308 } |
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309 catch (TransformerException te) { |
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310 log.error(te.getLocalizedMessage(), te); |
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311 } |
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312 |
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313 return false; |
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314 } |
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315 |
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316 public static String toString(Document document) { |
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317 try { |
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318 Transformer transformer = |
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319 TransformerFactory.newInstance().newTransformer(); |
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320 DOMSource source = new DOMSource(document); |
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321 StringWriter out = new StringWriter(); |
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322 StreamResult result = new StreamResult(out); |
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323 transformer.transform(source, result); |
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324 out.flush(); |
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325 return out.toString(); |
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326 } |
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327 catch (TransformerConfigurationException tce) { |
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328 log.error(tce.getLocalizedMessage(), tce); |
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329 } |
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330 catch (TransformerFactoryConfigurationError tfce) { |
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331 log.error(tfce.getLocalizedMessage(), tfce); |
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332 } |
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333 catch (TransformerException te) { |
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334 log.error(te.getLocalizedMessage(), te); |
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335 } |
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336 |
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337 return null; |
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338 } |
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339 } |
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340 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |