Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 323:1d3607ceb9fa
Improved the XMLUtils to support xpath expressions that contain variables.
artifacts/trunk@2540 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 24 Aug 2011 07:44:11 +0000 |
parents | 715bdf990739 |
children | e7d3f74854fb |
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 |
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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.Map; |
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12 import java.util.zip.GZIPInputStream; |
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13 import java.util.zip.GZIPOutputStream; |
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14 |
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15 import java.io.ByteArrayInputStream; |
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16 import java.io.FileInputStream; |
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17 import java.io.BufferedInputStream; |
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18 import java.io.ByteArrayOutputStream; |
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19 import java.io.File; |
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20 import java.io.IOException; |
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21 import java.io.InputStream; |
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22 import java.io.OutputStream; |
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23 import java.io.StringWriter; |
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24 |
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25 import javax.xml.namespace.NamespaceContext; |
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26 import javax.xml.namespace.QName; |
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27 |
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28 import javax.xml.parsers.DocumentBuilderFactory; |
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29 import javax.xml.parsers.ParserConfigurationException; |
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30 |
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31 import javax.xml.transform.Transformer; |
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32 import javax.xml.transform.TransformerConfigurationException; |
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33 import javax.xml.transform.TransformerException; |
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34 import javax.xml.transform.TransformerFactory; |
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35 import javax.xml.transform.TransformerFactoryConfigurationError; |
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36 |
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37 import javax.xml.transform.dom.DOMSource; |
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38 |
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39 import javax.xml.transform.stream.StreamResult; |
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40 |
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41 import javax.xml.xpath.XPath; |
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42 import javax.xml.xpath.XPathConstants; |
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43 import javax.xml.xpath.XPathExpressionException; |
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44 import javax.xml.xpath.XPathFactory; |
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45 import javax.xml.xpath.XPathVariableResolver; |
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46 |
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47 import org.apache.log4j.Logger; |
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48 |
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49 import org.w3c.dom.Attr; |
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50 import org.w3c.dom.Document; |
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51 import org.w3c.dom.Element; |
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52 |
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53 import org.xml.sax.SAXException; |
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54 |
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55 /** |
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56 * Some helper functions to ease work with XML concering namespaces, XPATH |
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57 * and so on. |
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58 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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59 */ |
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60 public final class XMLUtils |
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61 { |
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62 /** |
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63 * W3C URL of XForms |
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64 */ |
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65 public static final String XFORM_URL = "http://www.w3.org/2002/xforms"; |
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66 /** |
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67 * W3C prefix of XForms |
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68 */ |
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69 public static final String XFORM_PREFIX = "xform"; |
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70 |
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71 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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72 |
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73 private XMLUtils() { |
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74 } |
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75 |
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76 /** |
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77 * Helper class to generate elements and attributes with |
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78 * namespaces. |
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79 */ |
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80 public static class ElementCreator |
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81 { |
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82 /** |
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83 * owner document of the elements to be created |
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84 */ |
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85 protected Document document; |
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86 /** |
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87 * namespace to be used |
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88 */ |
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89 protected String ns; |
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90 /** |
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91 * prefix to be used |
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92 */ |
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93 protected String prefix; |
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94 |
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95 /** |
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96 * Constructor to create an element/attribute creator |
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97 * with a given namespace and namespace prefix using a |
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98 * given owner document. |
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99 * @param document The owning document |
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100 * @param ns The namespace |
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101 * @param prefix The namespace prefix |
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102 */ |
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103 public ElementCreator(Document document, String ns, String prefix) { |
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104 this.document = document; |
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105 this.ns = ns; |
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106 this.prefix = prefix; |
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107 } |
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108 |
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109 /** |
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110 * Creates a new element using the owning document with |
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111 * the this creators namespace and namespace prefix. |
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112 * @param name The name of the element |
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113 * @return The new element |
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114 */ |
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115 public Element create(String name) { |
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116 Element element = document.createElementNS(ns, name); |
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117 element.setPrefix(prefix); |
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118 return element; |
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119 } |
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120 |
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121 /** |
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122 * Adds a new attribute and its value to a given element. |
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123 * It does not set the namespace prefix. |
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124 * @param element The element to add the attribute to |
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125 * @param name The name of the attribute |
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126 * @param value The value of the attribute |
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127 */ |
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128 public void addAttr(Element element, String name, String value) { |
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129 addAttr(element, name, value, false); |
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130 } |
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131 |
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132 /** |
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133 * Adds a new attribute and its value to a given element. |
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134 * If the namespace prefix is used is decided by the 'addPrefix' flag. |
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135 * @param element The element to add the attribute to |
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136 * @param name The name of the attribute |
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137 * @param value The value of the attribute |
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138 * @param addPrefix If true the creators namespace prefix is |
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139 * set on the attribute. |
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140 */ |
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141 public void addAttr( |
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142 Element element, |
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143 String name, |
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144 String value, |
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145 boolean addPrefix |
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146 ) { |
202
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147 if (addPrefix) { |
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148 Attr attr = document.createAttributeNS(ns, name); |
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149 attr.setValue(value); |
102
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150 attr.setPrefix(prefix); |
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151 |
202
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152 element.setAttributeNode(attr); |
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153 } |
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154 else { |
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155 element.setAttribute(name, value); |
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156 } |
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157 |
102
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158 } |
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159 } // class ElementCreator |
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160 |
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161 /** |
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162 * Creates a new XML document |
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163 * @return the new XML document ot null if something went wrong during |
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164 * creation. |
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165 */ |
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166 public static final Document newDocument() { |
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167 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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168 factory.setNamespaceAware(true); |
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169 |
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170 try { |
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171 return factory.newDocumentBuilder().newDocument(); |
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172 } |
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173 catch (ParserConfigurationException pce) { |
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174 logger.error(pce.getLocalizedMessage(), pce); |
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175 } |
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176 return null; |
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177 } |
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178 |
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179 /** |
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180 * Loads a XML document namespace aware from a file |
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181 * @param file The file to load. |
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182 * @return the XML document or null if something went wrong |
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183 * during loading. |
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184 */ |
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185 public static final Document parseDocument(File file) { |
147
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186 InputStream inputStream = null; |
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187 try { |
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188 inputStream = new BufferedInputStream(new FileInputStream(file)); |
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189 return parseDocument(inputStream); |
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190 } |
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191 catch (IOException ioe) { |
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192 logger.error(ioe.getLocalizedMessage(), ioe); |
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193 } |
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194 finally { |
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195 if (inputStream != null) { |
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196 try { inputStream.close(); } |
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197 catch (IOException ioe) {} |
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198 } |
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199 } |
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200 return null; |
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201 } |
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202 |
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203 public static final Document parseDocument(InputStream inputStream) { |
102
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204 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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205 factory.setNamespaceAware(true); |
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206 |
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207 try { |
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208 return factory.newDocumentBuilder().parse(inputStream); |
102
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209 } |
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210 catch (ParserConfigurationException pce) { |
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211 logger.error(pce.getLocalizedMessage(), pce); |
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212 } |
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213 catch (SAXException se) { |
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214 logger.error(se.getLocalizedMessage(), se); |
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215 } |
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216 catch (IOException ioe) { |
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217 logger.error(ioe.getLocalizedMessage(), ioe); |
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218 } |
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219 return null; |
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220 } |
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221 |
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222 /** |
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223 * Creates a new XPath without a namespace context. |
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224 * @return the new XPath. |
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225 */ |
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226 public static final XPath newXPath() { |
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227 return newXPath(null, null); |
102
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228 } |
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229 |
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230 /** |
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231 * Creates a new XPath with a given namespace context. |
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232 * @param namespaceContext The namespace context to be used or null |
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233 * if none should be used. |
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234 * @return The new XPath |
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235 */ |
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236 public static final XPath newXPath( |
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237 NamespaceContext namespaceContext, |
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238 XPathVariableResolver resolver) |
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239 { |
102
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240 XPathFactory factory = XPathFactory.newInstance(); |
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241 XPath xpath = factory.newXPath(); |
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242 if (namespaceContext != null) { |
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243 xpath.setNamespaceContext(namespaceContext); |
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244 } |
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245 |
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246 if (resolver != null) { |
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247 xpath.setXPathVariableResolver(resolver); |
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248 } |
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249 return xpath; |
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250 } |
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251 |
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252 /** |
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253 * Evaluates an XPath query on a given object and returns the result |
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254 * as a given type. No namespace context is used. |
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255 * @param root The object which is used as the root of the tree to |
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256 * be searched in. |
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257 * @param query The XPath query |
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258 * @param returnTyp The type of the result. |
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259 * @return The result of type 'returnTyp' or null if something |
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260 * went wrong during XPath evaluation. |
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261 */ |
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262 public static final Object xpath( |
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263 Object root, |
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264 String query, |
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265 QName returnTyp |
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266 ) { |
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267 return xpath(root, query, returnTyp, null); |
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268 } |
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269 |
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270 /** |
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271 * Evaluates an XPath query on a given object and returns the result |
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272 * as a string. A given namespace context is used. |
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273 * @param root The object which is used as the root of the tree to |
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274 * be searched in. |
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275 * @param query The XPath query |
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276 * @param namespaceContext The namespace context to be used or null |
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277 * if none should be used. |
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278 * @return The result of the query or null if something went wrong |
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279 * during XPath evaluation. |
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280 */ |
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281 public static final String xpathString( |
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282 Object root, String query, NamespaceContext namespaceContext |
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283 ) { |
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284 return (String)xpath( |
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285 root, query, XPathConstants.STRING, namespaceContext); |
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286 } |
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287 |
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288 /** |
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289 * Evaluates an XPath query on a given object and returns the result |
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290 * as a given type. Optionally a namespace context is used. |
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291 * @param root The object which is used as the root of the tree to |
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292 * be searched in. |
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293 * @param query The XPath query |
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294 * @param returnType The type of the result. |
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295 * @param namespaceContext The namespace context to be used or null |
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296 * if none should be used. |
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297 * @return The result of type 'returnTyp' or null if something |
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298 * went wrong during XPath evaluation. |
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299 */ |
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300 public static final Object xpath( |
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301 Object root, |
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302 String query, |
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303 QName returnType, |
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304 NamespaceContext namespaceContext |
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305 ) { |
323
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306 return xpath(root, query, returnType, namespaceContext, null); |
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307 } |
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308 |
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309 public static final Object xpath( |
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310 Object root, |
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311 String query, |
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312 QName returnType, |
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313 NamespaceContext namespaceContext, |
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314 Map<String, String> variables) |
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315 { |
102
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316 if (root == null) { |
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317 return null; |
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318 } |
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319 |
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320 XPathVariableResolver resolver = variables != null |
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321 ? new MapXPathVariableResolver(variables) |
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322 : null; |
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323 |
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324 try { |
323
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325 XPath xpath = newXPath(namespaceContext, resolver); |
102
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326 if (xpath != null) { |
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327 return xpath.evaluate(query, root, returnType); |
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328 } |
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329 } |
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330 catch (XPathExpressionException xpee) { |
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331 logger.error(xpee.getLocalizedMessage(), xpee); |
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332 } |
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333 |
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334 return null; |
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335 } |
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336 |
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337 /** |
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338 * Streams out an XML document to a given output stream. |
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339 * @param document The document to be streamed out. |
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340 * @param out The output stream to be used. |
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341 * @return true if operation succeeded else false. |
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342 */ |
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343 public static boolean toStream(Document document, OutputStream out) { |
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344 try { |
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345 Transformer transformer = |
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346 TransformerFactory.newInstance().newTransformer(); |
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347 DOMSource source = new DOMSource(document); |
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348 StreamResult result = new StreamResult(out); |
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349 transformer.transform(source, result); |
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350 return true; |
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351 } |
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352 catch (TransformerConfigurationException tce) { |
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353 logger.error(tce.getLocalizedMessage(), tce); |
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354 } |
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355 catch (TransformerFactoryConfigurationError tfce) { |
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356 logger.error(tfce.getLocalizedMessage(), tfce); |
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357 } |
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358 catch (TransformerException te) { |
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359 logger.error(te.getLocalizedMessage(), te); |
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360 } |
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361 |
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362 return false; |
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363 } |
135
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364 |
286
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365 public static String toString(Document document) { |
276
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366 try { |
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367 Transformer transformer = |
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368 TransformerFactory.newInstance().newTransformer(); |
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369 DOMSource source = new DOMSource(document); |
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370 StringWriter out = new StringWriter(); |
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371 StreamResult result = new StreamResult(out); |
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372 transformer.transform(source, result); |
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373 out.flush(); |
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374 return out.toString(); |
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375 } |
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376 catch (TransformerConfigurationException tce) { |
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377 logger.error(tce.getLocalizedMessage(), tce); |
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378 } |
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379 catch (TransformerFactoryConfigurationError tfce) { |
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380 logger.error(tfce.getLocalizedMessage(), tfce); |
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381 } |
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382 catch (TransformerException te) { |
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383 logger.error(te.getLocalizedMessage(), te); |
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384 } |
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385 |
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386 return null; |
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387 } |
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388 |
234
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389 public static byte [] toByteArray(Document document) { |
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390 return toByteArray(document, false); |
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391 } |
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392 |
135
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393 /** |
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394 * Transforms an XML document into a byte array. |
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395 * @param document The document to be streamed out. |
234
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396 * @param compress The document should be compressed, too. |
135
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397 * @return the byte array or null if operation failed or |
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398 * document is null. |
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399 */ |
234
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400 public static byte [] toByteArray(Document document, boolean compress) { |
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Added a boolean flag to XML byte serialisation to compress/decompress, too.
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401 if (document != null) { |
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Added a boolean flag to XML byte serialisation to compress/decompress, too.
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402 try { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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403 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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Added a boolean flag to XML byte serialisation to compress/decompress, too.
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404 OutputStream out = compress |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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405 ? new GZIPOutputStream(baos) |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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406 : baos; |
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Added a boolean flag to XML byte serialisation to compress/decompress, too.
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407 boolean success = toStream(document, out); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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408 out.flush(); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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409 out.close(); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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410 return success |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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411 ? baos.toByteArray() |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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412 : null; |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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413 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
414 catch (IOException ioe) { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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415 logger.error(ioe); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
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|
416 } |
135
a48882c9e096
Added a convinience method to transform an document into a byte array.
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diff
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|
417 } |
234
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
418 return null; |
135
a48882c9e096
Added a convinience method to transform an document into a byte array.
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|
419 } |
147
9a64e0c1c737
Added code to load user from database.
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135
diff
changeset
|
420 |
9a64e0c1c737
Added code to load user from database.
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135
diff
changeset
|
421 public static Document fromByteArray(byte [] data) { |
234
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
422 return fromByteArray(data, false); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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423 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
424 |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
425 public static Document fromByteArray(byte [] data, boolean decompress) { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
426 if (data != null) { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
427 InputStream in = new ByteArrayInputStream(data); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
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|
428 try { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
429 if (decompress) { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
430 in = new GZIPInputStream(in); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
431 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
432 return parseDocument(in); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
433 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
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|
434 catch (IOException ioe) { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
435 logger.error(ioe); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
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|
436 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
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|
437 finally { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
changeset
|
438 try { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
439 in.close(); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
440 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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diff
changeset
|
441 catch (IOException ioe) { |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
442 logger.error(ioe); |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
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|
443 } |
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
202
diff
changeset
|
444 } |
147
9a64e0c1c737
Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
135
diff
changeset
|
445 } |
234
23d642319a0b
Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
202
diff
changeset
|
446 return null; |
147
9a64e0c1c737
Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
135
diff
changeset
|
447 } |
102
4122dbc9711b
Added a new package artifacts-common for classes and utilities used in several packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff
changeset
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448 } |
4122dbc9711b
Added a new package artifacts-common for classes and utilities used in several packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff
changeset
|
449 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |