annotate src/java/de/intevation/mxd/utils/XMLUtils.java @ 337:ee77a3ae0201

* src/java/de/intevation/mxd/reader/UniqueValueRendererReader.java: Log as UniqueValueRendererReader, add support for default class, Fix splitting of values.
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 06 Nov 2012 12:05:26 +0100
parents df4e0946ef02
children
rev   line source
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1 /*
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2 * Copyright (c) 2011 by Intevation GmbH, Germany <info@intevation.de>
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3 *
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4 * This file is part of MXD2map.
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5 *
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6 * This program is free software under the LGPL (>=v2.1)
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7 * Read the file LICENCE.txt coming with the software for details
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8 * or visit http://www.gnu.org/licenses/ if it does not exist.
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9 *
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10 * MXD2map has been developed on behalf of the
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11 * Bundesamt fuer Seeschifffahrt und Hydrographie (BSH) in Hamburg
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12 * by Intevation GmbH.
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13 *
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14 * Authors:
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15 * Raimund Renkert <raimund.renkert@intevation.de>
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16 * Bjoern Schilberg <bjoern.schilberg@intevation.de>
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17 * Stephan Holl <stephan.holl@intevation.de>
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18 */
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19
33
c51376f8e24c Separated converter components into packages.
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20 package de.intevation.mxd.utils;
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21
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22 import java.io.ByteArrayInputStream;
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23 import java.io.FileInputStream;
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24 import java.io.BufferedInputStream;
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25 import java.io.ByteArrayOutputStream;
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26 import java.io.File;
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27 import java.io.IOException;
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28 import java.io.InputStream;
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29 import java.io.OutputStream;
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30
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31 import javax.xml.namespace.NamespaceContext;
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32 import javax.xml.namespace.QName;
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33
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34 import javax.xml.parsers.DocumentBuilderFactory;
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35 import javax.xml.parsers.ParserConfigurationException;
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36
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37 import javax.xml.transform.Transformer;
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38 import javax.xml.transform.TransformerConfigurationException;
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39 import javax.xml.transform.TransformerException;
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40 import javax.xml.transform.TransformerFactory;
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41 import javax.xml.transform.TransformerFactoryConfigurationError;
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42
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43 import javax.xml.transform.dom.DOMSource;
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44
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45 import javax.xml.transform.stream.StreamResult;
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46
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47 import javax.xml.xpath.XPath;
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48 import javax.xml.xpath.XPathConstants;
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49 import javax.xml.xpath.XPathExpressionException;
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50 import javax.xml.xpath.XPathFactory;
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51
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52 import org.apache.log4j.Logger;
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53
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54 import org.w3c.dom.Attr;
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55 import org.w3c.dom.Document;
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56 import org.w3c.dom.Element;
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57
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58 import org.xml.sax.SAXException;
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59
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60 /**
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61 * Some helper functions to ease work with XML concering namespaces, XPATH
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62 * and so on.
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63 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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64 */
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65 public final class XMLUtils
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66 {
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67 /**
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68 * W3C URL of XForms
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69 */
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70 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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71 /**
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72 * W3C prefix of XForms
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73 */
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74 public static final String XFORM_PREFIX = "xform";
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75
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76 private static Logger logger = Logger.getLogger(XMLUtils.class);
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77
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78 private XMLUtils() {
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79 }
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80
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81 /**
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82 * Helper class to generate elements and attributes with
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83 * namespaces.
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84 */
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85 public static class ElementCreator
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86 {
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87 /**
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88 * owner document of the elements to be created
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89 */
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90 protected Document document;
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91 /**
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92 * namespace to be used
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93 */
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94 protected String ns;
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95 /**
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96 * prefix to be used
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97 */
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98 protected String prefix;
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99
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100 /**
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101 * Constructor to create an element/attribute creator
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102 * with a given namespace and namespace prefix using a
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103 * given owner document.
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104 * @param document The owning document
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105 * @param ns The namespace
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106 * @param prefix The namespace prefix
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107 */
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108 public ElementCreator(Document document, String ns, String prefix) {
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109 this.document = document;
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110 this.ns = ns;
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111 this.prefix = prefix;
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112 }
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113
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114 /**
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115 * Creates a new element using the owning document with
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116 * the this creators namespace and namespace prefix.
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117 * @param name The name of the element
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118 * @return The new element
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119 */
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120 public Element create(String name) {
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121 Element element = document.createElementNS(ns, name);
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122 element.setPrefix(prefix);
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123 return element;
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124 }
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125
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126 /**
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127 * Adds a new attribute and its value to a given element.
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128 * It does not set the namespace prefix.
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129 * @param element The element to add the attribute to
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130 * @param name The name of the attribute
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131 * @param value The value of the attribute
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132 */
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133 public void addAttr(Element element, String name, String value) {
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134 addAttr(element, name, value, false);
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135 }
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136
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137 /**
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138 * Adds a new attribute and its value to a given element.
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139 * If the namespace prefix is used is decided by the 'addPrefix' flag.
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140 * @param element The element to add the attribute to
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141 * @param name The name of the attribute
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142 * @param value The value of the attribute
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143 * @param addPrefix If true the creators namespace prefix is
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144 * set on the attribute.
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145 */
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146 public void addAttr(
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147 Element element,
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148 String name,
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149 String value,
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150 boolean addPrefix
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151 ) {
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152 if (addPrefix) {
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153 Attr attr = document.createAttributeNS(ns, name);
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154 attr.setValue(value);
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155 attr.setPrefix(prefix);
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156
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157 element.setAttributeNode(attr);
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158 }
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159 else {
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160 element.setAttribute(name, value);
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161 }
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162
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163 }
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164 } // class ElementCreator
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165
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166 /**
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167 * Creates a new XML document
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168 * @return the new XML document ot null if something went wrong during
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169 * creation.
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170 */
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171 public static final Document newDocument() {
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172 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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173 factory.setNamespaceAware(true);
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174
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175 try {
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176 return factory.newDocumentBuilder().newDocument();
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177 }
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178 catch (ParserConfigurationException pce) {
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179 logger.error(pce.getLocalizedMessage(), pce);
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180 }
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181 return null;
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182 }
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183
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184 /**
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185 * Loads a XML document namespace aware from a file
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186 * @param file The file to load.
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187 * @return the XML document or null if something went wrong
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188 * during loading.
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189 */
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190 public static final Document parseDocument(File file) {
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191 InputStream inputStream = null;
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192 try {
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193 inputStream = new BufferedInputStream(new FileInputStream(file));
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194 return parseDocument(inputStream);
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195 }
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196 catch (IOException ioe) {
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197 logger.error(ioe.getLocalizedMessage(), ioe);
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198 }
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199 finally {
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200 if (inputStream != null) {
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201 try { inputStream.close(); }
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202 catch (IOException ioe) {}
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203 }
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204 }
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205 return null;
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206 }
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207
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208 public static final Document parseDocument(InputStream inputStream) {
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209 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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210 factory.setNamespaceAware(true);
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211
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212 try {
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213 return factory.newDocumentBuilder().parse(inputStream);
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214 }
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215 catch (ParserConfigurationException pce) {
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216 logger.error(pce.getLocalizedMessage(), pce);
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217 }
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218 catch (SAXException se) {
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219 logger.error(se.getLocalizedMessage(), se);
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220 }
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221 catch (IOException ioe) {
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222 logger.error(ioe.getLocalizedMessage(), ioe);
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223 }
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224 return 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 without a namespace context.
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229 * @return the new XPath.
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230 */
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231 public static final XPath newXPath() {
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232 return newXPath(null);
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233 }
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234
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235 /**
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236 * Creates a new XPath with a given namespace context.
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237 * @param namespaceContext The namespace context to be used or null
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238 * if none should be used.
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239 * @return The new XPath
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240 */
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241 public static final XPath newXPath(NamespaceContext namespaceContext) {
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242 XPathFactory factory = XPathFactory.newInstance();
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243 XPath xpath = factory.newXPath();
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244 if (namespaceContext != null) {
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245 xpath.setNamespaceContext(namespaceContext);
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246 }
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247 return xpath;
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248 }
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249
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250 /**
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251 * Evaluates an XPath query on a given object and returns the result
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252 * as a given type. No namespace context is used.
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253 * @param root The object which is used as the root of the tree to
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254 * be searched in.
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255 * @param query The XPath query
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256 * @param returnTyp The type of the result.
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257 * @return The result of type 'returnTyp' or null if something
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258 * went wrong during XPath evaluation.
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259 */
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260 public static final Object xpath(
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261 Object root,
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262 String query,
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263 QName returnTyp
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264 ) {
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265 return xpath(root, query, returnTyp, null);
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266 }
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267
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268 /**
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269 * Evaluates an XPath query on a given object and returns the result
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270 * as a string. A given namespace context is used.
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271 * @param root The object which is used as the root of the tree to
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272 * be searched in.
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273 * @param query The XPath query
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274 * @param namespaceContext The namespace context to be used or null
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275 * if none should be used.
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276 * @return The result of the query or null if something went wrong
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277 * during XPath evaluation.
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278 */
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279 public static final String xpathString(
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280 Object root, String query, NamespaceContext namespaceContext
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281 ) {
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282 return (String)xpath(
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283 root, query, XPathConstants.STRING, namespaceContext);
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284 }
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285
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286 /**
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287 * Evaluates an XPath query on a given object and returns the result
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288 * as a given type. Optionally a namespace context is used.
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289 * @param root The object which is used as the root of the tree to
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290 * be searched in.
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291 * @param query The XPath query
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292 * @param returnType The type of the result.
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293 * @param namespaceContext The namespace context to be used or null
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294 * if none should be used.
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295 * @return The result of type 'returnTyp' or null if something
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296 * went wrong during XPath evaluation.
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297 */
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298 public static final Object xpath(
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299 Object root,
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300 String query,
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301 QName returnType,
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302 NamespaceContext namespaceContext
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303 ) {
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304 if (root == null) {
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305 return null;
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306 }
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307
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308 try {
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309 XPath xpath = newXPath(namespaceContext);
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310 if (xpath != null) {
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311 return xpath.evaluate(query, root, returnType);
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312 }
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313 }
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314 catch (XPathExpressionException xpee) {
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315 logger.error(xpee.getLocalizedMessage(), xpee);
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316 }
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317
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318 return null;
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319 }
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320
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321 /**
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322 * Streams out an XML document to a given output stream.
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323 * @param document The document to be streamed out.
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324 * @param out The output stream to be used.
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325 * @return true if operation succeeded else false.
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326 */
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327 public static boolean toStream(Document document, OutputStream out) {
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328 try {
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329 Transformer transformer =
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330 TransformerFactory.newInstance().newTransformer();
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331 DOMSource source = new DOMSource(document);
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332 StreamResult result = new StreamResult(out);
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333 transformer.transform(source, result);
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334 return true;
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335 }
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336 catch (TransformerConfigurationException tce) {
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337 logger.error(tce.getLocalizedMessage(), tce);
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338 }
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339 catch (TransformerFactoryConfigurationError tfce) {
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340 logger.error(tfce.getLocalizedMessage(), tfce);
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341 }
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342 catch (TransformerException te) {
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343 logger.error(te.getLocalizedMessage(), te);
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344 }
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345
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346 return false;
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347 }
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348
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349 /**
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350 * Transforms an XML document into a byte array.
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351 * @param document The document to be streamed out.
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352 * @return the byte array or null if operation failed or
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353 * document is null.
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354 */
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355 public static byte [] toByteArray(Document document) {
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356 if (document == null) {
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357 return null;
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358 }
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359 ByteArrayOutputStream baos = new ByteArrayOutputStream();
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360 return toStream(document, baos)
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361 ? baos.toByteArray()
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362 : null;
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363 }
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364
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365 public static Document fromByteArray(byte [] data) {
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366 if (data == null) {
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367 return null;
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368 }
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369 return parseDocument(new ByteArrayInputStream(data));
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370 }
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371 }
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372 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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