Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 162:4ac91485b4e0
Implemented the deleteCollection() interface method in the artifact database.
artifacts/trunk@1387 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 03 Mar 2011 13:56:27 +0000 |
parents | 9a64e0c1c737 |
children | c03d3a872cd2 |
rev | line source |
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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 |
103
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9 package de.intevation.artifacts.common.utils; |
102
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10 |
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11 import java.io.ByteArrayInputStream; |
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12 import java.io.FileInputStream; |
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13 import java.io.BufferedInputStream; |
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14 import java.io.ByteArrayOutputStream; |
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15 import java.io.File; |
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16 import java.io.IOException; |
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17 import java.io.InputStream; |
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18 import java.io.OutputStream; |
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19 |
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20 import javax.xml.namespace.NamespaceContext; |
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21 import javax.xml.namespace.QName; |
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22 |
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23 import javax.xml.parsers.DocumentBuilderFactory; |
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24 import javax.xml.parsers.ParserConfigurationException; |
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25 |
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26 import javax.xml.transform.Transformer; |
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27 import javax.xml.transform.TransformerConfigurationException; |
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28 import javax.xml.transform.TransformerException; |
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29 import javax.xml.transform.TransformerFactory; |
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30 import javax.xml.transform.TransformerFactoryConfigurationError; |
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31 |
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32 import javax.xml.transform.dom.DOMSource; |
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33 |
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34 import javax.xml.transform.stream.StreamResult; |
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35 |
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36 import javax.xml.xpath.XPath; |
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37 import javax.xml.xpath.XPathConstants; |
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38 import javax.xml.xpath.XPathExpressionException; |
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39 import javax.xml.xpath.XPathFactory; |
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40 |
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41 import org.apache.log4j.Logger; |
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42 |
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43 import org.w3c.dom.Attr; |
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44 import org.w3c.dom.Document; |
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45 import org.w3c.dom.Element; |
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46 |
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47 import org.xml.sax.SAXException; |
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48 |
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49 /** |
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50 * Some helper functions to ease work with XML concering namespaces, XPATH |
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51 * and so on. |
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52 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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53 */ |
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54 public final class XMLUtils |
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55 { |
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56 /** |
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57 * W3C URL of XForms |
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58 */ |
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59 public static final String XFORM_URL = "http://www.w3.org/2002/xforms"; |
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60 /** |
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61 * W3C prefix of XForms |
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62 */ |
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63 public static final String XFORM_PREFIX = "xform"; |
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64 |
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65 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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66 |
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67 private XMLUtils() { |
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68 } |
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69 |
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70 /** |
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71 * Helper class to generate elements and attributes with |
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72 * namespaces. |
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73 */ |
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74 public static class ElementCreator |
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75 { |
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76 /** |
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77 * owner document of the elements to be created |
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78 */ |
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79 protected Document document; |
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80 /** |
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81 * namespace to be used |
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82 */ |
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83 protected String ns; |
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84 /** |
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85 * prefix to be used |
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86 */ |
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87 protected String prefix; |
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88 |
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89 /** |
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90 * Constructor to create an element/attribute creator |
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91 * with a given namespace and namespace prefix using a |
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92 * given owner document. |
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93 * @param document The owning document |
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94 * @param ns The namespace |
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95 * @param prefix The namespace prefix |
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96 */ |
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97 public ElementCreator(Document document, String ns, String prefix) { |
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98 this.document = document; |
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99 this.ns = ns; |
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100 this.prefix = prefix; |
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101 } |
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102 |
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103 /** |
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104 * Creates a new element using the owning document with |
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105 * the this creators namespace and namespace prefix. |
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106 * @param name The name of the element |
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107 * @return The new element |
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108 */ |
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109 public Element create(String name) { |
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110 Element element = document.createElementNS(ns, name); |
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111 element.setPrefix(prefix); |
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112 return element; |
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113 } |
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114 |
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115 /** |
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116 * Adds a new attribute and its value to a given element. |
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117 * It does not set the namespace prefix. |
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118 * @param element The element to add the attribute to |
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119 * @param name The name of the attribute |
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120 * @param value The value of the attribute |
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121 */ |
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122 public void addAttr(Element element, String name, String value) { |
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123 addAttr(element, name, value, false); |
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124 } |
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125 |
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126 /** |
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127 * Adds a new attribute and its value to a given element. |
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128 * If the namespace prefix is used is decided by the 'addPrefix' flag. |
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129 * @param element The element to add the attribute to |
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130 * @param name The name of the attribute |
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131 * @param value The value of the attribute |
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132 * @param addPrefix If true the creators namespace prefix is |
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133 * set on the attribute. |
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134 */ |
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135 public void addAttr( |
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136 Element element, |
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137 String name, |
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138 String value, |
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139 boolean addPrefix |
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140 ) { |
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141 Attr attr = document.createAttributeNS(ns, name); |
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142 attr.setValue(value); |
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143 |
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144 if (addPrefix) |
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145 attr.setPrefix(prefix); |
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146 |
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147 element.setAttributeNode(attr); |
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148 } |
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149 } // class ElementCreator |
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150 |
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151 /** |
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152 * Creates a new XML document |
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153 * @return the new XML document ot null if something went wrong during |
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154 * creation. |
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155 */ |
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156 public static final Document newDocument() { |
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157 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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158 factory.setNamespaceAware(true); |
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159 |
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160 try { |
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161 return factory.newDocumentBuilder().newDocument(); |
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162 } |
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163 catch (ParserConfigurationException pce) { |
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164 logger.error(pce.getLocalizedMessage(), pce); |
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165 } |
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166 return null; |
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167 } |
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168 |
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169 /** |
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170 * Loads a XML document namespace aware from a file |
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171 * @param file The file to load. |
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172 * @return the XML document or null if something went wrong |
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173 * during loading. |
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174 */ |
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175 public static final Document parseDocument(File file) { |
147
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176 InputStream inputStream = null; |
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177 try { |
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178 inputStream = new BufferedInputStream(new FileInputStream(file)); |
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179 return parseDocument(inputStream); |
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180 } |
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181 catch (IOException ioe) { |
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182 logger.error(ioe.getLocalizedMessage(), ioe); |
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183 } |
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184 finally { |
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185 if (inputStream != null) { |
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186 try { inputStream.close(); } |
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187 catch (IOException ioe) {} |
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188 } |
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189 } |
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190 return null; |
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191 } |
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192 |
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193 public static final Document parseDocument(InputStream inputStream) { |
102
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194 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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195 factory.setNamespaceAware(true); |
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196 |
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197 try { |
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198 return factory.newDocumentBuilder().parse(inputStream); |
102
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199 } |
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200 catch (ParserConfigurationException pce) { |
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201 logger.error(pce.getLocalizedMessage(), pce); |
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202 } |
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203 catch (SAXException se) { |
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204 logger.error(se.getLocalizedMessage(), se); |
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205 } |
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206 catch (IOException ioe) { |
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207 logger.error(ioe.getLocalizedMessage(), ioe); |
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208 } |
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209 return null; |
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210 } |
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211 |
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212 /** |
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213 * Creates a new XPath without a namespace context. |
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214 * @return the new XPath. |
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215 */ |
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216 public static final XPath newXPath() { |
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217 return newXPath(null); |
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218 } |
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219 |
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220 /** |
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221 * Creates a new XPath with a given namespace context. |
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222 * @param namespaceContext The namespace context to be used or null |
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223 * if none should be used. |
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224 * @return The new XPath |
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225 */ |
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226 public static final XPath newXPath(NamespaceContext namespaceContext) { |
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227 XPathFactory factory = XPathFactory.newInstance(); |
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228 XPath xpath = factory.newXPath(); |
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229 if (namespaceContext != null) { |
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230 xpath.setNamespaceContext(namespaceContext); |
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231 } |
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232 return xpath; |
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233 } |
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234 |
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235 /** |
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236 * Evaluates an XPath query on a given object and returns the result |
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237 * as a given type. No namespace context is used. |
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238 * @param root The object which is used as the root of the tree to |
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239 * be searched in. |
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240 * @param query The XPath query |
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241 * @param returnTyp The type of the result. |
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242 * @return The result of type 'returnTyp' or null if something |
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243 * went wrong during XPath evaluation. |
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244 */ |
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245 public static final Object xpath( |
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246 Object root, |
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247 String query, |
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248 QName returnTyp |
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249 ) { |
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250 return xpath(root, query, returnTyp, null); |
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251 } |
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252 |
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253 /** |
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254 * Evaluates an XPath query on a given object and returns the result |
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255 * as a string. A given namespace context is used. |
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256 * @param root The object which is used as the root of the tree to |
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257 * be searched in. |
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258 * @param query The XPath query |
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259 * @param namespaceContext The namespace context to be used or null |
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260 * if none should be used. |
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261 * @return The result of the query or null if something went wrong |
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262 * during XPath evaluation. |
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263 */ |
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264 public static final String xpathString( |
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265 Object root, String query, NamespaceContext namespaceContext |
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266 ) { |
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267 return (String)xpath( |
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268 root, query, XPathConstants.STRING, namespaceContext); |
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269 } |
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270 |
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271 /** |
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272 * Evaluates an XPath query on a given object and returns the result |
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273 * as a given type. Optionally a namespace context is used. |
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274 * @param root The object which is used as the root of the tree to |
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275 * be searched in. |
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276 * @param query The XPath query |
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277 * @param returnType The type of the result. |
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278 * @param namespaceContext The namespace context to be used or null |
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279 * if none should be used. |
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280 * @return The result of type 'returnTyp' or null if something |
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281 * went wrong during XPath evaluation. |
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282 */ |
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283 public static final Object xpath( |
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284 Object root, |
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285 String query, |
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286 QName returnType, |
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287 NamespaceContext namespaceContext |
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288 ) { |
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289 if (root == null) { |
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290 return null; |
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291 } |
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292 |
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293 try { |
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294 XPath xpath = newXPath(namespaceContext); |
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295 if (xpath != null) { |
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296 return xpath.evaluate(query, root, returnType); |
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297 } |
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298 } |
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299 catch (XPathExpressionException xpee) { |
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300 logger.error(xpee.getLocalizedMessage(), xpee); |
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301 } |
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302 |
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303 return null; |
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304 } |
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305 |
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306 /** |
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307 * Streams out an XML document to a given output stream. |
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308 * @param document The document to be streamed out. |
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309 * @param out The output stream to be used. |
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310 * @return true if operation succeeded else false. |
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311 */ |
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312 public static boolean toStream(Document document, OutputStream out) { |
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313 try { |
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314 Transformer transformer = |
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315 TransformerFactory.newInstance().newTransformer(); |
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316 DOMSource source = new DOMSource(document); |
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317 StreamResult result = new StreamResult(out); |
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318 transformer.transform(source, result); |
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319 return true; |
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320 } |
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321 catch (TransformerConfigurationException tce) { |
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322 logger.error(tce.getLocalizedMessage(), tce); |
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323 } |
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324 catch (TransformerFactoryConfigurationError tfce) { |
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325 logger.error(tfce.getLocalizedMessage(), tfce); |
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326 } |
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327 catch (TransformerException te) { |
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328 logger.error(te.getLocalizedMessage(), te); |
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329 } |
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330 |
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331 return false; |
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332 } |
135
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333 |
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334 /** |
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335 * Transforms an XML document into a byte array. |
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336 * @param document The document to be streamed out. |
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337 * @return the byte array or null if operation failed or |
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338 * document is null. |
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339 */ |
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340 public static byte [] toByteArray(Document document) { |
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341 if (document == null) { |
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342 return null; |
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343 } |
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344 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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345 return toStream(document, baos) |
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346 ? baos.toByteArray() |
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347 : null; |
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348 } |
147
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349 |
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350 public static Document fromByteArray(byte [] data) { |
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351 if (data == null) { |
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352 return null; |
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353 } |
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354 return parseDocument(new ByteArrayInputStream(data)); |
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355 } |
102
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356 } |
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357 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |