Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 239:ab196a861796
Enhanced the ClientProtocolUtils with a method that creates an XML document used for the Collection's out() operation.
artifacts/trunk@1653 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 07 Apr 2011 11:25:00 +0000 |
parents | 23d642319a0b |
children | 8b58259d3dd3 |
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.util.zip.GZIPInputStream; |
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12 import java.util.zip.GZIPOutputStream; |
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13 |
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14 import java.io.ByteArrayInputStream; |
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15 import java.io.FileInputStream; |
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16 import java.io.BufferedInputStream; |
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17 import java.io.ByteArrayOutputStream; |
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18 import java.io.File; |
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19 import java.io.IOException; |
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20 import java.io.InputStream; |
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21 import java.io.OutputStream; |
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22 |
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23 import javax.xml.namespace.NamespaceContext; |
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24 import javax.xml.namespace.QName; |
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25 |
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26 import javax.xml.parsers.DocumentBuilderFactory; |
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27 import javax.xml.parsers.ParserConfigurationException; |
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28 |
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29 import javax.xml.transform.Transformer; |
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30 import javax.xml.transform.TransformerConfigurationException; |
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31 import javax.xml.transform.TransformerException; |
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32 import javax.xml.transform.TransformerFactory; |
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33 import javax.xml.transform.TransformerFactoryConfigurationError; |
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34 |
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35 import javax.xml.transform.dom.DOMSource; |
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36 |
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37 import javax.xml.transform.stream.StreamResult; |
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38 |
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39 import javax.xml.xpath.XPath; |
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40 import javax.xml.xpath.XPathConstants; |
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41 import javax.xml.xpath.XPathExpressionException; |
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42 import javax.xml.xpath.XPathFactory; |
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43 |
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44 import org.apache.log4j.Logger; |
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45 |
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46 import org.w3c.dom.Attr; |
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47 import org.w3c.dom.Document; |
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48 import org.w3c.dom.Element; |
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49 |
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50 import org.xml.sax.SAXException; |
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51 |
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52 /** |
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53 * Some helper functions to ease work with XML concering namespaces, XPATH |
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54 * and so on. |
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55 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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56 */ |
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57 public final class XMLUtils |
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58 { |
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59 /** |
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60 * W3C URL of XForms |
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61 */ |
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62 public static final String XFORM_URL = "http://www.w3.org/2002/xforms"; |
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63 /** |
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64 * W3C prefix of XForms |
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65 */ |
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66 public static final String XFORM_PREFIX = "xform"; |
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67 |
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68 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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69 |
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70 private XMLUtils() { |
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71 } |
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72 |
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73 /** |
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74 * Helper class to generate elements and attributes with |
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75 * namespaces. |
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76 */ |
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77 public static class ElementCreator |
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78 { |
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79 /** |
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80 * owner document of the elements to be created |
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81 */ |
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82 protected Document document; |
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83 /** |
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84 * namespace to be used |
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85 */ |
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86 protected String ns; |
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87 /** |
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88 * prefix to be used |
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89 */ |
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90 protected String prefix; |
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91 |
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92 /** |
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93 * Constructor to create an element/attribute creator |
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94 * with a given namespace and namespace prefix using a |
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95 * given owner document. |
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96 * @param document The owning document |
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97 * @param ns The namespace |
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98 * @param prefix The namespace prefix |
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99 */ |
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100 public ElementCreator(Document document, String ns, String prefix) { |
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101 this.document = document; |
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102 this.ns = ns; |
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103 this.prefix = prefix; |
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104 } |
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105 |
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106 /** |
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107 * Creates a new element using the owning document with |
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108 * the this creators namespace and namespace prefix. |
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109 * @param name The name of the element |
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110 * @return The new element |
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111 */ |
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112 public Element create(String name) { |
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113 Element element = document.createElementNS(ns, name); |
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114 element.setPrefix(prefix); |
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115 return element; |
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116 } |
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117 |
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118 /** |
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119 * Adds a new attribute and its value to a given element. |
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120 * It does not set the namespace prefix. |
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121 * @param element The element to add the attribute to |
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122 * @param name The name of the attribute |
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123 * @param value The value of the attribute |
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124 */ |
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125 public void addAttr(Element element, String name, String value) { |
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126 addAttr(element, name, value, false); |
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127 } |
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128 |
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129 /** |
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130 * Adds a new attribute and its value to a given element. |
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131 * If the namespace prefix is used is decided by the 'addPrefix' flag. |
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132 * @param element The element to add the attribute to |
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133 * @param name The name of the attribute |
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134 * @param value The value of the attribute |
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135 * @param addPrefix If true the creators namespace prefix is |
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136 * set on the attribute. |
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137 */ |
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138 public void addAttr( |
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139 Element element, |
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140 String name, |
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141 String value, |
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142 boolean addPrefix |
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143 ) { |
202
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144 if (addPrefix) { |
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145 Attr attr = document.createAttributeNS(ns, name); |
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146 attr.setValue(value); |
102
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147 attr.setPrefix(prefix); |
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148 |
202
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149 element.setAttributeNode(attr); |
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150 } |
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151 else { |
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152 element.setAttribute(name, value); |
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153 } |
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154 |
102
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155 } |
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156 } // class ElementCreator |
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157 |
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158 /** |
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159 * Creates a new XML document |
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160 * @return the new XML document ot null if something went wrong during |
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161 * creation. |
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162 */ |
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163 public static final Document newDocument() { |
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164 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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165 factory.setNamespaceAware(true); |
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166 |
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167 try { |
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168 return factory.newDocumentBuilder().newDocument(); |
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169 } |
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170 catch (ParserConfigurationException pce) { |
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171 logger.error(pce.getLocalizedMessage(), pce); |
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172 } |
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173 return null; |
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174 } |
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175 |
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176 /** |
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177 * Loads a XML document namespace aware from a file |
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178 * @param file The file to load. |
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179 * @return the XML document or null if something went wrong |
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180 * during loading. |
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181 */ |
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182 public static final Document parseDocument(File file) { |
147
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183 InputStream inputStream = null; |
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184 try { |
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185 inputStream = new BufferedInputStream(new FileInputStream(file)); |
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186 return parseDocument(inputStream); |
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187 } |
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188 catch (IOException ioe) { |
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189 logger.error(ioe.getLocalizedMessage(), ioe); |
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190 } |
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191 finally { |
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192 if (inputStream != null) { |
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193 try { inputStream.close(); } |
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194 catch (IOException ioe) {} |
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195 } |
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196 } |
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197 return null; |
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198 } |
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199 |
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200 public static final Document parseDocument(InputStream inputStream) { |
102
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201 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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202 factory.setNamespaceAware(true); |
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203 |
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204 try { |
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205 return factory.newDocumentBuilder().parse(inputStream); |
102
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206 } |
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207 catch (ParserConfigurationException pce) { |
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208 logger.error(pce.getLocalizedMessage(), pce); |
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209 } |
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210 catch (SAXException se) { |
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211 logger.error(se.getLocalizedMessage(), se); |
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212 } |
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213 catch (IOException ioe) { |
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214 logger.error(ioe.getLocalizedMessage(), ioe); |
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215 } |
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216 return null; |
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217 } |
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218 |
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219 /** |
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220 * Creates a new XPath without a namespace context. |
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221 * @return the new XPath. |
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222 */ |
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223 public static final XPath newXPath() { |
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224 return newXPath(null); |
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225 } |
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226 |
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227 /** |
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228 * Creates a new XPath with a given namespace context. |
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229 * @param namespaceContext The namespace context to be used or null |
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230 * if none should be used. |
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231 * @return The new XPath |
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232 */ |
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233 public static final XPath newXPath(NamespaceContext namespaceContext) { |
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234 XPathFactory factory = XPathFactory.newInstance(); |
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235 XPath xpath = factory.newXPath(); |
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236 if (namespaceContext != null) { |
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237 xpath.setNamespaceContext(namespaceContext); |
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238 } |
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239 return xpath; |
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240 } |
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241 |
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242 /** |
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243 * Evaluates an XPath query on a given object and returns the result |
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244 * as a given type. No namespace context is used. |
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245 * @param root The object which is used as the root of the tree to |
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246 * be searched in. |
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247 * @param query The XPath query |
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248 * @param returnTyp The type of the result. |
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249 * @return The result of type 'returnTyp' or null if something |
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250 * went wrong during XPath evaluation. |
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251 */ |
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252 public static final Object xpath( |
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253 Object root, |
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254 String query, |
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255 QName returnTyp |
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256 ) { |
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257 return xpath(root, query, returnTyp, null); |
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258 } |
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259 |
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260 /** |
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261 * Evaluates an XPath query on a given object and returns the result |
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262 * as a string. A given namespace context is used. |
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263 * @param root The object which is used as the root of the tree to |
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264 * be searched in. |
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265 * @param query The XPath query |
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266 * @param namespaceContext The namespace context to be used or null |
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267 * if none should be used. |
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268 * @return The result of the query or null if something went wrong |
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269 * during XPath evaluation. |
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270 */ |
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271 public static final String xpathString( |
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272 Object root, String query, NamespaceContext namespaceContext |
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273 ) { |
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274 return (String)xpath( |
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275 root, query, XPathConstants.STRING, namespaceContext); |
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276 } |
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277 |
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278 /** |
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279 * Evaluates an XPath query on a given object and returns the result |
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280 * as a given type. Optionally a namespace context is used. |
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281 * @param root The object which is used as the root of the tree to |
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282 * be searched in. |
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283 * @param query The XPath query |
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284 * @param returnType The type of the result. |
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285 * @param namespaceContext The namespace context to be used or null |
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286 * if none should be used. |
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287 * @return The result of type 'returnTyp' or null if something |
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288 * went wrong during XPath evaluation. |
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289 */ |
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290 public static final Object xpath( |
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291 Object root, |
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292 String query, |
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293 QName returnType, |
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294 NamespaceContext namespaceContext |
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295 ) { |
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296 if (root == null) { |
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297 return null; |
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298 } |
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299 |
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300 try { |
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301 XPath xpath = newXPath(namespaceContext); |
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302 if (xpath != null) { |
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303 return xpath.evaluate(query, root, returnType); |
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304 } |
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305 } |
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306 catch (XPathExpressionException xpee) { |
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307 logger.error(xpee.getLocalizedMessage(), xpee); |
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308 } |
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309 |
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310 return null; |
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311 } |
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312 |
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313 /** |
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314 * Streams out an XML document to a given output stream. |
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315 * @param document The document to be streamed out. |
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316 * @param out The output stream to be used. |
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317 * @return true if operation succeeded else false. |
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318 */ |
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319 public static boolean toStream(Document document, OutputStream out) { |
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320 try { |
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321 Transformer transformer = |
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322 TransformerFactory.newInstance().newTransformer(); |
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323 DOMSource source = new DOMSource(document); |
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324 StreamResult result = new StreamResult(out); |
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325 transformer.transform(source, result); |
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326 return true; |
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327 } |
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328 catch (TransformerConfigurationException tce) { |
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329 logger.error(tce.getLocalizedMessage(), tce); |
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330 } |
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331 catch (TransformerFactoryConfigurationError tfce) { |
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332 logger.error(tfce.getLocalizedMessage(), tfce); |
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333 } |
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334 catch (TransformerException te) { |
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335 logger.error(te.getLocalizedMessage(), te); |
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336 } |
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337 |
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338 return false; |
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339 } |
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340 |
234
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341 public static byte [] toByteArray(Document document) { |
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342 return toByteArray(document, false); |
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343 } |
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344 |
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345 /** |
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346 * Transforms an XML document into a byte array. |
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347 * @param document The document to be streamed out. |
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348 * @param compress The document should be compressed, too. |
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349 * @return the byte array or null if operation failed or |
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350 * document is null. |
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351 */ |
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352 public static byte [] toByteArray(Document document, boolean compress) { |
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353 if (document != null) { |
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354 try { |
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355 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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356 OutputStream out = compress |
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357 ? new GZIPOutputStream(baos) |
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358 : baos; |
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359 boolean success = toStream(document, out); |
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360 out.flush(); |
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361 out.close(); |
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362 return success |
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363 ? baos.toByteArray() |
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364 : null; |
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365 } |
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366 catch (IOException ioe) { |
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367 logger.error(ioe); |
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368 } |
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369 } |
234
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370 return null; |
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371 } |
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372 |
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373 public static Document fromByteArray(byte [] data) { |
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374 return fromByteArray(data, false); |
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375 } |
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376 |
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377 public static Document fromByteArray(byte [] data, boolean decompress) { |
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378 if (data != null) { |
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379 InputStream in = new ByteArrayInputStream(data); |
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380 try { |
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381 if (decompress) { |
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382 in = new GZIPInputStream(in); |
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383 } |
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384 return parseDocument(in); |
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385 } |
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386 catch (IOException ioe) { |
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387 logger.error(ioe); |
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388 } |
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389 finally { |
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390 try { |
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391 in.close(); |
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392 } |
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393 catch (IOException ioe) { |
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394 logger.error(ioe); |
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395 } |
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396 } |
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397 } |
234
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398 return null; |
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399 } |
102
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400 } |
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401 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |