Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/utils/XML.java @ 4092:b3fc044f75ba

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Added code to store W/Q values into FLYS database. flys-aft/trunk@3602 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 05 Jan 2012 17:06:29 +0000
parents 44dc38ca8492
children da9df3641578
rev   line source
4070
d09adfa90942 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.FileInputStream;
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4 import java.io.BufferedInputStream;
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5 import java.io.File;
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6 import java.io.IOException;
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7 import java.io.InputStream;
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8
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9 import org.w3c.dom.Document;
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10
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11 import javax.xml.parsers.DocumentBuilderFactory;
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12 import javax.xml.parsers.ParserConfigurationException;
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13
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14 import org.xml.sax.SAXException;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import java.util.HashMap;
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19 import java.util.Map;
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20
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21 import javax.xml.namespace.NamespaceContext;
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22 import javax.xml.namespace.QName;
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23
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24 import javax.xml.xpath.XPath;
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25 import javax.xml.xpath.XPathExpressionException;
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26 import javax.xml.xpath.XPathFactory;
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27 import javax.xml.xpath.XPathVariableResolver;
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28
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29 import javax.xml.transform.Transformer;
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30 import javax.xml.transform.TransformerFactory;
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31 import javax.xml.transform.TransformerConfigurationException;
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32 import javax.xml.transform.TransformerException;
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33
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34 import javax.xml.transform.stream.StreamSource;
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35
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36 import javax.xml.transform.dom.DOMSource;
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37 import javax.xml.transform.dom.DOMResult;
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38
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39 public final class XML
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40 {
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41 /** Logger for this class. */
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42 private static Logger log = Logger.getLogger(XML.class);
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43
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44 public static class MapXPathVariableResolver
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45 implements XPathVariableResolver
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46 {
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47 protected Map<String, String> variables;
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48
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49
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50 public MapXPathVariableResolver() {
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51 this.variables = new HashMap<String, String>();
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52 }
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53
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54
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55 public MapXPathVariableResolver(Map<String, String> variables) {
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56 this.variables = variables;
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57 }
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58
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59
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60 public void addVariable(String name, String value) {
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61 variables.put(name, value);
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62 }
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63
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64
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65 @Override
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66 public Object resolveVariable(QName variableName) {
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67 String key = variableName.getLocalPart();
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68 return variables.get(key);
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69 }
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70 } // class MapXPathVariableResolver
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71
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72 private XML() {
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73 }
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74
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75 /**
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76 * Loads a XML document namespace aware from a file
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77 * @param file The file to load.
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78 * @return the XML document or null if something went wrong
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79 * during loading.
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80 */
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81 public static final Document parseDocument(File file) {
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82 return parseDocument(file, Boolean.TRUE);
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83 }
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84
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85 public static final Document parseDocument(File file, Boolean namespaceAware) {
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86 InputStream inputStream = null;
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87 try {
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88 inputStream = new BufferedInputStream(new FileInputStream(file));
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89 return parseDocument(inputStream, namespaceAware);
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90 }
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91 catch (IOException ioe) {
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92 log.error(ioe.getLocalizedMessage(), ioe);
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93 }
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94 finally {
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95 if (inputStream != null) {
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96 try { inputStream.close(); }
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97 catch (IOException ioe) {}
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98 }
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99 }
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100 return null;
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101 }
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102
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103
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104 public static final Document parseDocument(InputStream inputStream) {
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105 return parseDocument(inputStream, Boolean.TRUE);
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106 }
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107
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108 public static final Document parseDocument(
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109 InputStream inputStream,
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110 Boolean namespaceAware
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111 ) {
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112 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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113
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114 if (namespaceAware != null) {
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115 factory.setNamespaceAware(namespaceAware.booleanValue());
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116 }
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117
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118 try {
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119 return factory.newDocumentBuilder().parse(inputStream);
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120 }
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121 catch (ParserConfigurationException pce) {
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122 log.error(pce.getLocalizedMessage(), pce);
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123 }
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124 catch (SAXException se) {
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125 log.error(se.getLocalizedMessage(), se);
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126 }
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127 catch (IOException ioe) {
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128 log.error(ioe.getLocalizedMessage(), ioe);
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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 /**
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135 * Creates a new XPath without a namespace context.
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136 * @return the new XPath.
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137 */
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138 public static final XPath newXPath() {
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139 return newXPath(null, null);
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140 }
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141
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142 /**
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143 * Creates a new XPath with a given namespace context.
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144 * @param namespaceContext The namespace context to be used or null
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145 * if none should be used.
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146 * @return The new XPath
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147 */
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148 public static final XPath newXPath(
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149 NamespaceContext namespaceContext,
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150 XPathVariableResolver resolver)
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151 {
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152 XPathFactory factory = XPathFactory.newInstance();
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153 XPath xpath = factory.newXPath();
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154 if (namespaceContext != null) {
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155 xpath.setNamespaceContext(namespaceContext);
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156 }
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157
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158 if (resolver != null) {
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159 xpath.setXPathVariableResolver(resolver);
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160 }
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161 return xpath;
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162 }
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163
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164 /**
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165 * Evaluates an XPath query on a given object and returns the result
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166 * as a given type. No namespace context is used.
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167 * @param root The object which is used as the root of the tree to
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168 * be searched in.
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169 * @param query The XPath query
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170 * @param returnTyp The type of the result.
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171 * @return The result of type 'returnTyp' or null if something
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172 * went wrong during XPath evaluation.
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173 */
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174 public static final Object xpath(
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175 Object root,
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176 String query,
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177 QName returnTyp
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178 ) {
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179 return xpath(root, query, returnTyp, null);
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180 }
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181
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182 /**
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183 * Evaluates an XPath query on a given object and returns the result
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184 * as a given type. Optionally a namespace context is used.
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185 * @param root The object which is used as the root of the tree to
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186 * be searched in.
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187 * @param query The XPath query
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188 * @param returnType The type of the result.
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189 * @param namespaceContext The namespace context to be used or null
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190 * if none should be used.
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191 * @return The result of type 'returnTyp' or null if something
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192 * went wrong during XPath evaluation.
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193 */
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194 public static final Object xpath(
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195 Object root,
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196 String query,
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197 QName returnType,
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198 NamespaceContext namespaceContext
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199 ) {
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200 return xpath(root, query, returnType, namespaceContext, null);
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201 }
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202
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203 public static final Object xpath(
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204 Object root,
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205 String query,
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206 QName returnType,
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207 NamespaceContext namespaceContext,
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208 Map<String, String> variables)
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209 {
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210 if (root == null) {
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211 return null;
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212 }
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213
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214 XPathVariableResolver resolver = variables != null
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215 ? new MapXPathVariableResolver(variables)
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216 : null;
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217
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218 try {
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219 XPath xpath = newXPath(namespaceContext, resolver);
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220 if (xpath != null) {
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221 return xpath.evaluate(query, root, returnType);
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222 }
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223 }
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224 catch (XPathExpressionException xpee) {
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225 log.error(xpee.getLocalizedMessage(), xpee);
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226 }
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227
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228 return null;
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229 }
4083
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230
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231 public static Document transform(
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232 Document document,
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233 File xformFile
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234 ) {
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235 try {
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236 Transformer transformer =
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237 TransformerFactory
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238 .newInstance()
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239 .newTransformer(
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240 new StreamSource(xformFile));
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241
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242 DOMResult result = new DOMResult();
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243
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244 transformer.transform(new DOMSource(document), result);
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245
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246 return (Document)result.getNode();
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247 }
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248 catch (TransformerConfigurationException tce) {
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249 log.error(tce, tce);
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250 }
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251 catch (TransformerException te) {
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252 log.error(te, te);
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253 }
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254
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255 return null;
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256 }
4070
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257 }
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258 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org