Mercurial > dive4elements > river
annotate flys-aft/src/main/java/de/intevation/utils/XML.java @ 5708:e8469247dc6b
Backend: Reset km index after parsing a file.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Mon, 15 Apr 2013 15:48:58 +0200 |
parents | f939e1e6cfa4 |
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rev | line source |
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Added XML/XPath support.
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1 package de.intevation.utils; |
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2 |
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3 import java.io.BufferedInputStream; |
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4 import java.io.File; |
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5 import java.io.FileInputStream; |
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6 import java.io.IOException; |
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7 import java.io.InputStream; |
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8 import java.io.OutputStream; |
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9 import java.io.StringWriter; |
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10 |
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11 import java.util.HashMap; |
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12 import java.util.Map; |
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13 |
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14 import javax.xml.namespace.NamespaceContext; |
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15 import javax.xml.namespace.QName; |
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16 |
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17 import javax.xml.parsers.DocumentBuilderFactory; |
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18 import javax.xml.parsers.ParserConfigurationException; |
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19 |
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20 import javax.xml.transform.Transformer; |
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21 import javax.xml.transform.TransformerConfigurationException; |
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22 import javax.xml.transform.TransformerException; |
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23 import javax.xml.transform.TransformerFactory; |
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24 import javax.xml.transform.TransformerFactoryConfigurationError; |
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25 |
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26 import javax.xml.transform.dom.DOMResult; |
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27 import javax.xml.transform.dom.DOMSource; |
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28 |
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29 import javax.xml.transform.stream.StreamResult; |
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30 import javax.xml.transform.stream.StreamSource; |
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31 |
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32 import javax.xml.xpath.XPath; |
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33 import javax.xml.xpath.XPathExpressionException; |
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34 import javax.xml.xpath.XPathFactory; |
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35 import javax.xml.xpath.XPathVariableResolver; |
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36 |
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37 import org.apache.log4j.Logger; |
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38 |
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39 import org.w3c.dom.Document; |
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40 |
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41 import org.xml.sax.SAXException; |
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42 |
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43 public final class XML |
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44 { |
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45 /** Logger for this class. */ |
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46 private static Logger log = Logger.getLogger(XML.class); |
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47 |
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48 public static class MapXPathVariableResolver |
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49 implements XPathVariableResolver |
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50 { |
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51 protected Map<String, String> variables; |
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52 |
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53 |
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54 public MapXPathVariableResolver() { |
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55 this.variables = new HashMap<String, String>(); |
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56 } |
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57 |
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58 |
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59 public MapXPathVariableResolver(Map<String, String> variables) { |
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60 this.variables = variables; |
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61 } |
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62 |
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63 |
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64 public void addVariable(String name, String value) { |
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65 variables.put(name, value); |
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66 } |
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67 |
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68 |
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69 @Override |
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70 public Object resolveVariable(QName variableName) { |
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71 String key = variableName.getLocalPart(); |
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72 return variables.get(key); |
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73 } |
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74 } // class MapXPathVariableResolver |
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75 |
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76 private XML() { |
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77 } |
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78 |
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79 /** |
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80 * Creates a new XML document |
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81 * @return the new XML document ot null if something went wrong during |
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82 * creation. |
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83 */ |
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84 public static final Document newDocument() { |
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85 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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86 factory.setNamespaceAware(true); |
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87 |
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88 try { |
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89 return factory.newDocumentBuilder().newDocument(); |
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90 } |
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91 catch (ParserConfigurationException pce) { |
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92 log.error(pce.getLocalizedMessage(), pce); |
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93 } |
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94 return null; |
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95 } |
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96 |
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97 /** |
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98 * Loads a XML document namespace aware from a file |
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99 * @param file The file to load. |
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100 * @return the XML document or null if something went wrong |
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101 * during loading. |
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102 */ |
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103 public static final Document parseDocument(File file) { |
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104 return parseDocument(file, Boolean.TRUE); |
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105 } |
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106 |
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107 public static final Document parseDocument(File file, Boolean namespaceAware) { |
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108 InputStream inputStream = null; |
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109 try { |
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110 inputStream = new BufferedInputStream(new FileInputStream(file)); |
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111 return parseDocument(inputStream, namespaceAware); |
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112 } |
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113 catch (IOException ioe) { |
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114 log.error(ioe.getLocalizedMessage(), ioe); |
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115 } |
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116 finally { |
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117 if (inputStream != null) { |
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118 try { inputStream.close(); } |
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119 catch (IOException ioe) {} |
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120 } |
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121 } |
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122 return null; |
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123 } |
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124 |
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125 |
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126 public static final Document parseDocument(InputStream inputStream) { |
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127 return parseDocument(inputStream, Boolean.TRUE); |
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128 } |
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129 |
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130 public static final Document parseDocument( |
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131 InputStream inputStream, |
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132 Boolean namespaceAware |
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133 ) { |
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134 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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135 |
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136 if (namespaceAware != null) { |
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137 factory.setNamespaceAware(namespaceAware.booleanValue()); |
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138 } |
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139 |
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140 try { |
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141 return factory.newDocumentBuilder().parse(inputStream); |
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142 } |
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143 catch (ParserConfigurationException pce) { |
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144 log.error(pce.getLocalizedMessage(), pce); |
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145 } |
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146 catch (SAXException se) { |
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147 log.error(se.getLocalizedMessage(), se); |
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148 } |
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149 catch (IOException ioe) { |
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150 log.error(ioe.getLocalizedMessage(), ioe); |
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151 } |
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152 return null; |
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153 } |
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154 |
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155 |
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156 /** |
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157 * Creates a new XPath without a namespace context. |
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158 * @return the new XPath. |
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159 */ |
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160 public static final XPath newXPath() { |
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161 return newXPath(null, null); |
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162 } |
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163 |
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164 /** |
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165 * Creates a new XPath with a given namespace context. |
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166 * @param namespaceContext The namespace context to be used or null |
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167 * if none should be used. |
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168 * @return The new XPath |
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169 */ |
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170 public static final XPath newXPath( |
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171 NamespaceContext namespaceContext, |
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172 XPathVariableResolver resolver) |
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173 { |
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174 XPathFactory factory = XPathFactory.newInstance(); |
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175 XPath xpath = factory.newXPath(); |
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176 if (namespaceContext != null) { |
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177 xpath.setNamespaceContext(namespaceContext); |
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178 } |
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179 |
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180 if (resolver != null) { |
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181 xpath.setXPathVariableResolver(resolver); |
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182 } |
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183 return xpath; |
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184 } |
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185 |
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186 /** |
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187 * Evaluates an XPath query on a given object and returns the result |
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188 * as a given type. No namespace context is used. |
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189 * @param root The object which is used as the root of the tree to |
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190 * be searched in. |
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191 * @param query The XPath query |
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192 * @param returnTyp The type of the result. |
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193 * @return The result of type 'returnTyp' or null if something |
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194 * went wrong during XPath evaluation. |
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195 */ |
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196 public static final Object xpath( |
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197 Object root, |
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198 String query, |
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199 QName returnTyp |
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200 ) { |
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201 return xpath(root, query, returnTyp, null); |
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202 } |
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203 |
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|
204 /** |
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205 * Evaluates an XPath query on a given object and returns the result |
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206 * as a given type. Optionally a namespace context is used. |
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207 * @param root The object which is used as the root of the tree to |
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208 * be searched in. |
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|
209 * @param query The XPath query |
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210 * @param returnType The type of the result. |
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211 * @param namespaceContext The namespace context to be used or null |
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212 * if none should be used. |
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213 * @return The result of type 'returnTyp' or null if something |
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214 * went wrong during XPath evaluation. |
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|
215 */ |
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|
216 public static final Object xpath( |
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|
217 Object root, |
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|
218 String query, |
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|
219 QName returnType, |
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|
220 NamespaceContext namespaceContext |
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|
221 ) { |
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|
222 return xpath(root, query, returnType, namespaceContext, null); |
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|
223 } |
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|
224 |
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|
225 public static final Object xpath( |
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|
226 Object root, |
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|
227 String query, |
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|
228 QName returnType, |
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|
229 NamespaceContext namespaceContext, |
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|
230 Map<String, String> variables) |
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|
231 { |
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|
232 if (root == null) { |
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|
233 return null; |
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|
234 } |
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|
235 |
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|
236 XPathVariableResolver resolver = variables != null |
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|
237 ? new MapXPathVariableResolver(variables) |
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|
238 : null; |
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|
239 |
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|
240 try { |
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|
241 XPath xpath = newXPath(namespaceContext, resolver); |
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|
242 if (xpath != null) { |
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|
243 return xpath.evaluate(query, root, returnType); |
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244 } |
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245 } |
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246 catch (XPathExpressionException xpee) { |
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247 log.error(xpee.getLocalizedMessage(), xpee); |
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248 } |
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249 |
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250 return null; |
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251 } |
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252 |
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253 public static Document transform( |
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254 Document document, |
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255 File xformFile |
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256 ) { |
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257 try { |
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258 Transformer transformer = |
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259 TransformerFactory |
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260 .newInstance() |
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261 .newTransformer( |
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262 new StreamSource(xformFile)); |
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263 |
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264 DOMResult result = new DOMResult(); |
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265 |
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266 transformer.transform(new DOMSource(document), result); |
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267 |
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268 return (Document)result.getNode(); |
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269 } |
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270 catch (TransformerConfigurationException tce) { |
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271 log.error(tce, tce); |
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272 } |
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273 catch (TransformerException te) { |
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274 log.error(te, te); |
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275 } |
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276 |
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277 return null; |
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278 } |
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279 |
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280 /** |
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281 * Streams out an XML document to a given output stream. |
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282 * @param document The document to be streamed out. |
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283 * @param out The output stream to be used. |
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284 * @return true if operation succeeded else false. |
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285 */ |
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286 public static boolean toStream(Document document, OutputStream out) { |
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287 try { |
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288 Transformer transformer = |
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289 TransformerFactory.newInstance().newTransformer(); |
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290 DOMSource source = new DOMSource(document); |
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291 StreamResult result = new StreamResult(out); |
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292 transformer.transform(source, result); |
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293 return true; |
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294 } |
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295 catch (TransformerConfigurationException tce) { |
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296 log.error(tce.getLocalizedMessage(), tce); |
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297 } |
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298 catch (TransformerFactoryConfigurationError tfce) { |
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299 log.error(tfce.getLocalizedMessage(), tfce); |
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300 } |
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301 catch (TransformerException te) { |
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302 log.error(te.getLocalizedMessage(), te); |
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303 } |
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304 |
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305 return false; |
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306 } |
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307 |
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308 public static String toString(Document document) { |
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309 try { |
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310 Transformer transformer = |
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311 TransformerFactory.newInstance().newTransformer(); |
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312 DOMSource source = new DOMSource(document); |
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313 StringWriter out = new StringWriter(); |
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314 StreamResult result = new StreamResult(out); |
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315 transformer.transform(source, result); |
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316 out.flush(); |
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317 return out.toString(); |
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318 } |
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319 catch (TransformerConfigurationException tce) { |
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320 log.error(tce.getLocalizedMessage(), tce); |
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321 } |
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322 catch (TransformerFactoryConfigurationError tfce) { |
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323 log.error(tfce.getLocalizedMessage(), tfce); |
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324 } |
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325 catch (TransformerException te) { |
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326 log.error(te.getLocalizedMessage(), te); |
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327 } |
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328 |
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329 return null; |
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330 } |
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331 } |
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332 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |