Mercurial > dive4elements > framework
annotate artifact-database/src/main/java/de/intevation/artifactdatabase/XMLUtils.java @ 203:b5e1949bc255
Implemented a new method in the ClientProtocolUtils that creates the document for a FEED operation.
artifacts/trunk@1448 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 10 Mar 2011 08:26:08 +0000 |
parents | 933bbc9fc11f |
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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.artifactdatabase; |
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10 |
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11 import java.io.File; |
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12 import java.io.IOException; |
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13 import java.io.OutputStream; |
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14 |
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15 import javax.xml.namespace.NamespaceContext; |
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16 import javax.xml.namespace.QName; |
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17 |
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18 import javax.xml.parsers.DocumentBuilderFactory; |
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19 import javax.xml.parsers.ParserConfigurationException; |
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20 |
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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 |
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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 |
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31 import javax.xml.xpath.XPath; |
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32 import javax.xml.xpath.XPathConstants; |
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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 |
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36 import org.apache.log4j.Logger; |
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37 |
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38 import org.w3c.dom.Attr; |
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39 import org.w3c.dom.Document; |
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40 import org.w3c.dom.Element; |
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41 |
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42 import org.xml.sax.SAXException; |
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43 |
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44 /** |
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45 * Some helper functions to ease work with XML concering namespaces, XPATH |
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46 * and so on. |
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47 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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48 */ |
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49 public final class XMLUtils |
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50 { |
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51 /** |
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52 * W3C URL of XForms |
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53 */ |
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54 public static final String XFORM_URL = "http://www.w3.org/2002/xforms"; |
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55 /** |
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56 * W3C prefix of XForms |
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57 */ |
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58 public static final String XFORM_PREFIX = "xform"; |
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59 |
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60 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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61 |
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62 private XMLUtils() { |
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63 } |
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64 |
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65 /** |
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66 * Helper class to generate elements and attributes with |
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67 * namespaces. |
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68 */ |
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69 public static class ElementCreator |
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70 { |
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71 /** |
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72 * owner document of the elements to be created |
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73 */ |
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74 protected Document document; |
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75 /** |
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76 * namespace to be used |
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77 */ |
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78 protected String ns; |
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79 /** |
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80 * prefix to be used |
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81 */ |
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82 protected String prefix; |
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83 |
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84 /** |
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85 * Constructor to create an element/attribute creator |
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86 * with a given namespace and namespace prefix using a |
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87 * given owner document. |
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88 * @param document The owning document |
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89 * @param ns The namespace |
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90 * @param prefix The namespace prefix |
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91 */ |
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92 public ElementCreator(Document document, String ns, String prefix) { |
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93 this.document = document; |
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94 this.ns = ns; |
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95 this.prefix = prefix; |
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96 } |
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97 |
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98 /** |
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99 * Creates a new element using the owning document with |
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100 * the this creators namespace and namespace prefix. |
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101 * @param name The name of the element |
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102 * @return The new element |
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103 */ |
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104 public Element create(String name) { |
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105 Element element = document.createElementNS(ns, name); |
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106 element.setPrefix(prefix); |
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107 return element; |
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108 } |
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109 |
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110 /** |
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111 * Adds a new attribute and its value to a given element. |
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112 * It does not set the namespace prefix. |
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113 * @param element The element to add the attribute to |
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114 * @param name The name of the attribute |
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115 * @param value The value of the attribute |
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116 */ |
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117 public void addAttr(Element element, String name, String value) { |
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118 addAttr(element, name, value, false); |
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119 } |
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120 |
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121 /** |
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122 * Adds a new attribute and its value to a given element. |
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123 * If the namespace prefix is used is decided by the 'addPrefix' flag. |
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124 * @param element The element to add the attribute to |
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125 * @param name The name of the attribute |
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126 * @param value The value of the attribute |
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127 * @param addPrefix If true the creators namespace prefix is |
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128 * set on the attribute. |
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129 */ |
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130 public void addAttr( |
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131 Element element, |
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132 String name, |
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133 String value, |
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134 boolean addPrefix |
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135 ) { |
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136 Attr attr = document.createAttributeNS(ns, name); |
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137 attr.setValue(value); |
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138 |
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139 if (addPrefix) |
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140 attr.setPrefix(prefix); |
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141 |
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142 element.setAttributeNode(attr); |
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143 } |
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144 } // class ElementCreator |
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145 |
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146 /** |
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147 * Creates a new XML document |
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148 * @return the new XML document ot null if something went wrong during |
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149 * creation. |
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150 */ |
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151 public static final Document newDocument() { |
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152 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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153 factory.setNamespaceAware(true); |
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154 |
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155 try { |
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156 return factory.newDocumentBuilder().newDocument(); |
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157 } |
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158 catch (ParserConfigurationException pce) { |
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159 logger.error(pce.getLocalizedMessage(), pce); |
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160 } |
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161 return null; |
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162 } |
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163 |
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164 /** |
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165 * Loads a XML document namespace aware from a file |
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166 * @param file The file to load. |
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167 * @return the XML document or null if something went wrong |
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168 * during loading. |
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169 */ |
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170 public static final Document parseDocument(File file) { |
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171 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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172 factory.setNamespaceAware(true); |
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173 |
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174 try { |
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175 return factory.newDocumentBuilder().parse(file); |
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176 } |
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177 catch (ParserConfigurationException pce) { |
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178 logger.error(pce.getLocalizedMessage(), pce); |
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179 } |
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180 catch (SAXException se) { |
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181 logger.error(se.getLocalizedMessage(), se); |
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182 } |
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183 catch (IOException ioe) { |
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184 logger.error(ioe.getLocalizedMessage(), ioe); |
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185 } |
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186 return null; |
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187 } |
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188 |
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189 /** |
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190 * Creates a new XPath without a namespace context. |
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191 * @return the new XPath. |
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192 */ |
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193 public static final XPath newXPath() { |
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194 return newXPath(null); |
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195 } |
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196 |
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197 /** |
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198 * Creates a new XPath with a given namespace context. |
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199 * @param namespaceContext The namespace context to be used or null |
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200 * if none should be used. |
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201 * @return The new XPath |
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202 */ |
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203 public static final XPath newXPath(NamespaceContext namespaceContext) { |
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204 XPathFactory factory = XPathFactory.newInstance(); |
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205 XPath xpath = factory.newXPath(); |
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206 if (namespaceContext != null) { |
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207 xpath.setNamespaceContext(namespaceContext); |
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208 } |
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209 return xpath; |
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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. No 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 returnTyp The type of the result. |
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219 * @return The result of type 'returnTyp' or null if something |
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220 * went wrong during XPath evaluation. |
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221 */ |
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222 public static final Object xpath( |
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223 Object root, |
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224 String query, |
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225 QName returnTyp |
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226 ) { |
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227 return xpath(root, query, returnTyp, null); |
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228 } |
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229 |
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230 /** |
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231 * Evaluates an XPath query on a given object and returns the result |
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232 * as a string. A given namespace context is used. |
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233 * @param root The object which is used as the root of the tree to |
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234 * be searched in. |
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235 * @param query The XPath query |
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236 * @param namespaceContext The namespace context to be used or null |
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237 * if none should be used. |
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238 * @return The result of the query or null if something went wrong |
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239 * during XPath evaluation. |
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240 */ |
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241 public static final String xpathString( |
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242 Object root, String query, NamespaceContext namespaceContext |
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243 ) { |
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244 return (String)xpath( |
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245 root, query, XPathConstants.STRING, namespaceContext); |
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246 } |
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247 |
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248 /** |
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249 * Evaluates an XPath query on a given object and returns the result |
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250 * as a given type. Optionally a namespace context is used. |
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251 * @param root The object which is used as the root of the tree to |
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252 * be searched in. |
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253 * @param query The XPath query |
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254 * @param returnType The type of the result. |
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255 * @param namespaceContext The namespace context to be used or null |
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256 * if none should be used. |
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257 * @return The result of type 'returnTyp' or null if something |
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258 * went wrong during XPath evaluation. |
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259 */ |
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260 public static final Object xpath( |
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261 Object root, |
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262 String query, |
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263 QName returnType, |
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264 NamespaceContext namespaceContext |
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265 ) { |
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266 if (root == null) { |
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267 return null; |
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268 } |
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269 |
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270 try { |
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271 XPath xpath = newXPath(namespaceContext); |
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272 if (xpath != null) { |
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273 return xpath.evaluate(query, root, returnType); |
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274 } |
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275 } |
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276 catch (XPathExpressionException xpee) { |
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277 logger.error(xpee.getLocalizedMessage(), xpee); |
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278 } |
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279 |
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280 return null; |
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281 } |
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282 |
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283 /** |
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284 * Streams out an XML document to a given output stream. |
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285 * @param document The document to be streamed out. |
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286 * @param out The output stream to be used. |
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287 * @return true if operation succeeded else false. |
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288 */ |
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289 public static boolean toStream(Document document, OutputStream out) { |
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290 try { |
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291 Transformer transformer = |
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292 TransformerFactory.newInstance().newTransformer(); |
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293 DOMSource source = new DOMSource(document); |
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294 StreamResult result = new StreamResult(out); |
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295 transformer.transform(source, result); |
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296 return true; |
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297 } |
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298 catch (TransformerConfigurationException tce) { |
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299 logger.error(tce.getLocalizedMessage(), tce); |
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300 } |
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301 catch (TransformerFactoryConfigurationError tfce) { |
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302 logger.error(tfce.getLocalizedMessage(), tfce); |
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303 } |
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304 catch (TransformerException te) { |
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305 logger.error(te.getLocalizedMessage(), te); |
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306 } |
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307 |
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308 return false; |
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309 } |
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310 } |
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311 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |