Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 276:8b58259d3dd3
Added static toString(Document) method which transform XML documents to Strings.
artifacts/trunk@2093 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Thu, 09 Jun 2011 09:33:29 +0000 |
parents | 23d642319a0b |
children | 715bdf990739 |
rev | line source |
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102
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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; |
135
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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 import java.io.StringWriter; |
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23 |
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24 import javax.xml.namespace.NamespaceContext; |
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25 import javax.xml.namespace.QName; |
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26 |
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27 import javax.xml.parsers.DocumentBuilderFactory; |
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28 import javax.xml.parsers.ParserConfigurationException; |
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29 |
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30 import javax.xml.transform.Transformer; |
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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 import javax.xml.transform.TransformerFactory; |
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34 import javax.xml.transform.TransformerFactoryConfigurationError; |
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35 |
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36 import javax.xml.transform.dom.DOMSource; |
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37 |
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38 import javax.xml.transform.stream.StreamResult; |
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39 |
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40 import javax.xml.xpath.XPath; |
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41 import javax.xml.xpath.XPathConstants; |
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42 import javax.xml.xpath.XPathExpressionException; |
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43 import javax.xml.xpath.XPathFactory; |
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44 |
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45 import org.apache.log4j.Logger; |
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46 |
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47 import org.w3c.dom.Attr; |
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48 import org.w3c.dom.Document; |
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49 import org.w3c.dom.Element; |
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50 |
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51 import org.xml.sax.SAXException; |
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52 |
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53 /** |
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54 * Some helper functions to ease work with XML concering namespaces, XPATH |
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55 * and so on. |
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56 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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57 */ |
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58 public final class XMLUtils |
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59 { |
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60 /** |
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61 * W3C URL of XForms |
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62 */ |
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63 public static final String XFORM_URL = "http://www.w3.org/2002/xforms"; |
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64 /** |
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65 * W3C prefix of XForms |
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66 */ |
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67 public static final String XFORM_PREFIX = "xform"; |
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68 |
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69 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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70 |
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71 private XMLUtils() { |
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72 } |
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73 |
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74 /** |
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75 * Helper class to generate elements and attributes with |
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76 * namespaces. |
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77 */ |
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78 public static class ElementCreator |
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79 { |
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80 /** |
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81 * owner document of the elements to be created |
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82 */ |
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83 protected Document document; |
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84 /** |
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85 * namespace to be used |
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86 */ |
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87 protected String ns; |
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88 /** |
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89 * prefix to be used |
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90 */ |
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91 protected String prefix; |
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92 |
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93 /** |
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94 * Constructor to create an element/attribute creator |
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95 * with a given namespace and namespace prefix using a |
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96 * given owner document. |
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97 * @param document The owning document |
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98 * @param ns The namespace |
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99 * @param prefix The namespace prefix |
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100 */ |
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101 public ElementCreator(Document document, String ns, String prefix) { |
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102 this.document = document; |
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103 this.ns = ns; |
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104 this.prefix = prefix; |
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105 } |
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106 |
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107 /** |
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108 * Creates a new element using the owning document with |
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109 * the this creators namespace and namespace prefix. |
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110 * @param name The name of the element |
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111 * @return The new element |
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112 */ |
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113 public Element create(String name) { |
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114 Element element = document.createElementNS(ns, name); |
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115 element.setPrefix(prefix); |
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116 return element; |
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117 } |
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118 |
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119 /** |
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120 * Adds a new attribute and its value to a given element. |
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121 * It does not set the namespace prefix. |
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122 * @param element The element to add the attribute to |
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123 * @param name The name of the attribute |
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124 * @param value The value of the attribute |
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125 */ |
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126 public void addAttr(Element element, String name, String value) { |
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127 addAttr(element, name, value, false); |
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128 } |
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129 |
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130 /** |
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131 * Adds a new attribute and its value to a given element. |
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132 * If the namespace prefix is used is decided by the 'addPrefix' flag. |
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133 * @param element The element to add the attribute to |
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134 * @param name The name of the attribute |
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135 * @param value The value of the attribute |
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136 * @param addPrefix If true the creators namespace prefix is |
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137 * set on the attribute. |
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138 */ |
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139 public void addAttr( |
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140 Element element, |
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141 String name, |
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142 String value, |
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143 boolean addPrefix |
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144 ) { |
202
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145 if (addPrefix) { |
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146 Attr attr = document.createAttributeNS(ns, name); |
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147 attr.setValue(value); |
102
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148 attr.setPrefix(prefix); |
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149 |
202
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150 element.setAttributeNode(attr); |
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151 } |
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152 else { |
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153 element.setAttribute(name, value); |
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154 } |
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155 |
102
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156 } |
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157 } // class ElementCreator |
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158 |
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159 /** |
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160 * Creates a new XML document |
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161 * @return the new XML document ot null if something went wrong during |
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162 * creation. |
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163 */ |
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164 public static final Document newDocument() { |
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165 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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166 factory.setNamespaceAware(true); |
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167 |
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168 try { |
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169 return factory.newDocumentBuilder().newDocument(); |
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170 } |
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171 catch (ParserConfigurationException pce) { |
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172 logger.error(pce.getLocalizedMessage(), pce); |
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173 } |
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174 return null; |
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175 } |
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176 |
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177 /** |
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178 * Loads a XML document namespace aware from a file |
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179 * @param file The file to load. |
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180 * @return the XML document or null if something went wrong |
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181 * during loading. |
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182 */ |
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183 public static final Document parseDocument(File file) { |
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184 InputStream inputStream = null; |
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185 try { |
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186 inputStream = new BufferedInputStream(new FileInputStream(file)); |
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187 return parseDocument(inputStream); |
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188 } |
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189 catch (IOException ioe) { |
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190 logger.error(ioe.getLocalizedMessage(), ioe); |
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191 } |
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192 finally { |
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193 if (inputStream != null) { |
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194 try { inputStream.close(); } |
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195 catch (IOException ioe) {} |
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196 } |
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197 } |
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198 return null; |
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199 } |
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200 |
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201 public static final Document parseDocument(InputStream inputStream) { |
102
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202 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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203 factory.setNamespaceAware(true); |
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204 |
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205 try { |
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206 return factory.newDocumentBuilder().parse(inputStream); |
102
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207 } |
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208 catch (ParserConfigurationException pce) { |
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209 logger.error(pce.getLocalizedMessage(), pce); |
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210 } |
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211 catch (SAXException se) { |
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212 logger.error(se.getLocalizedMessage(), se); |
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213 } |
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214 catch (IOException ioe) { |
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215 logger.error(ioe.getLocalizedMessage(), ioe); |
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216 } |
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217 return 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 without a namespace context. |
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222 * @return the new XPath. |
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223 */ |
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224 public static final XPath newXPath() { |
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225 return newXPath(null); |
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226 } |
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227 |
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228 /** |
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229 * Creates a new XPath with a given namespace context. |
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230 * @param namespaceContext The namespace context to be used or null |
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231 * if none should be used. |
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232 * @return The new XPath |
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233 */ |
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234 public static final XPath newXPath(NamespaceContext namespaceContext) { |
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235 XPathFactory factory = XPathFactory.newInstance(); |
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236 XPath xpath = factory.newXPath(); |
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237 if (namespaceContext != null) { |
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238 xpath.setNamespaceContext(namespaceContext); |
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239 } |
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240 return xpath; |
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241 } |
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242 |
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243 /** |
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244 * Evaluates an XPath query on a given object and returns the result |
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245 * as a given type. No namespace context is used. |
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246 * @param root The object which is used as the root of the tree to |
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247 * be searched in. |
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248 * @param query The XPath query |
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249 * @param returnTyp The type of the result. |
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250 * @return The result of type 'returnTyp' or null if something |
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251 * went wrong during XPath evaluation. |
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252 */ |
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253 public static final Object xpath( |
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254 Object root, |
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255 String query, |
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256 QName returnTyp |
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257 ) { |
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258 return xpath(root, query, returnTyp, null); |
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259 } |
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260 |
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261 /** |
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262 * Evaluates an XPath query on a given object and returns the result |
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263 * as a string. A given namespace context is used. |
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264 * @param root The object which is used as the root of the tree to |
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265 * be searched in. |
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266 * @param query The XPath query |
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267 * @param namespaceContext The namespace context to be used or null |
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268 * if none should be used. |
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269 * @return The result of the query or null if something went wrong |
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270 * during XPath evaluation. |
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271 */ |
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272 public static final String xpathString( |
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273 Object root, String query, NamespaceContext namespaceContext |
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274 ) { |
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275 return (String)xpath( |
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276 root, query, XPathConstants.STRING, namespaceContext); |
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277 } |
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278 |
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279 /** |
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280 * Evaluates an XPath query on a given object and returns the result |
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281 * as a given type. Optionally a namespace context is used. |
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282 * @param root The object which is used as the root of the tree to |
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283 * be searched in. |
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284 * @param query The XPath query |
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285 * @param returnType The type of the result. |
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286 * @param namespaceContext The namespace context to be used or null |
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287 * if none should be used. |
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288 * @return The result of type 'returnTyp' or null if something |
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289 * went wrong during XPath evaluation. |
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290 */ |
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291 public static final Object xpath( |
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292 Object root, |
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293 String query, |
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294 QName returnType, |
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295 NamespaceContext namespaceContext |
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296 ) { |
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297 if (root == null) { |
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298 return null; |
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299 } |
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300 |
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301 try { |
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302 XPath xpath = newXPath(namespaceContext); |
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303 if (xpath != null) { |
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304 return xpath.evaluate(query, root, returnType); |
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305 } |
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306 } |
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307 catch (XPathExpressionException xpee) { |
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308 logger.error(xpee.getLocalizedMessage(), xpee); |
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309 } |
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310 |
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311 return null; |
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312 } |
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313 |
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314 /** |
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315 * Streams out an XML document to a given output stream. |
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316 * @param document The document to be streamed out. |
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317 * @param out The output stream to be used. |
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318 * @return true if operation succeeded else false. |
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319 */ |
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320 public static boolean toStream(Document document, OutputStream out) { |
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321 try { |
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322 Transformer transformer = |
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323 TransformerFactory.newInstance().newTransformer(); |
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324 DOMSource source = new DOMSource(document); |
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325 StreamResult result = new StreamResult(out); |
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326 transformer.transform(source, result); |
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327 return true; |
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328 } |
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329 catch (TransformerConfigurationException tce) { |
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330 logger.error(tce.getLocalizedMessage(), tce); |
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331 } |
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332 catch (TransformerFactoryConfigurationError tfce) { |
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333 logger.error(tfce.getLocalizedMessage(), tfce); |
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334 } |
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335 catch (TransformerException te) { |
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336 logger.error(te.getLocalizedMessage(), te); |
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337 } |
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338 |
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339 return false; |
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340 } |
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341 |
276
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342 public String toString(Document document) { |
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343 try { |
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344 Transformer transformer = |
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345 TransformerFactory.newInstance().newTransformer(); |
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346 DOMSource source = new DOMSource(document); |
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347 StringWriter out = new StringWriter(); |
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348 StreamResult result = new StreamResult(out); |
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349 transformer.transform(source, result); |
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350 out.flush(); |
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351 return out.toString(); |
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352 } |
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353 catch (TransformerConfigurationException tce) { |
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354 logger.error(tce.getLocalizedMessage(), tce); |
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355 } |
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356 catch (TransformerFactoryConfigurationError tfce) { |
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357 logger.error(tfce.getLocalizedMessage(), tfce); |
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358 } |
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359 catch (TransformerException te) { |
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360 logger.error(te.getLocalizedMessage(), te); |
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361 } |
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362 |
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363 return null; |
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364 } |
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365 |
234
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366 public static byte [] toByteArray(Document document) { |
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367 return toByteArray(document, false); |
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368 } |
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369 |
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370 /** |
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371 * Transforms an XML document into a byte array. |
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372 * @param document The document to be streamed out. |
234
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373 * @param compress The document should be compressed, too. |
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374 * @return the byte array or null if operation failed or |
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375 * document is null. |
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376 */ |
234
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377 public static byte [] toByteArray(Document document, boolean compress) { |
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378 if (document != null) { |
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379 try { |
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380 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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381 OutputStream out = compress |
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382 ? new GZIPOutputStream(baos) |
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383 : baos; |
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384 boolean success = toStream(document, out); |
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385 out.flush(); |
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386 out.close(); |
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387 return success |
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388 ? baos.toByteArray() |
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389 : null; |
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390 } |
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391 catch (IOException ioe) { |
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392 logger.error(ioe); |
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393 } |
135
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394 } |
234
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395 return null; |
135
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396 } |
147
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397 |
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398 public static Document fromByteArray(byte [] data) { |
234
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399 return fromByteArray(data, false); |
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400 } |
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401 |
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402 public static Document fromByteArray(byte [] data, boolean decompress) { |
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403 if (data != null) { |
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404 InputStream in = new ByteArrayInputStream(data); |
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405 try { |
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406 if (decompress) { |
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407 in = new GZIPInputStream(in); |
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408 } |
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409 return parseDocument(in); |
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410 } |
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411 catch (IOException ioe) { |
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412 logger.error(ioe); |
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413 } |
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414 finally { |
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415 try { |
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416 in.close(); |
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417 } |
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418 catch (IOException ioe) { |
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419 logger.error(ioe); |
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420 } |
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421 } |
147
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422 } |
234
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423 return null; |
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424 } |
102
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Added a new package artifacts-common for classes and utilities used in several packages.
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425 } |
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Added a new package artifacts-common for classes and utilities used in several packages.
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426 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |