annotate src/java/de/intevation/mxd/utils/XMLUtils.java @ 175:f11d13940626

Handle symbol set and font set paths.
author raimund renkert <raimund.renkert@intevation.de>
date Thu, 07 Jul 2011 13:03:56 +0200
parents c51376f8e24c
children df4e0946ef02
rev   line source
27
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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
33
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9 package de.intevation.mxd.utils;
27
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10
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11 import java.io.ByteArrayInputStream;
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12 import java.io.FileInputStream;
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13 import java.io.BufferedInputStream;
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14 import java.io.ByteArrayOutputStream;
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15 import java.io.File;
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16 import java.io.IOException;
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17 import java.io.InputStream;
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18 import java.io.OutputStream;
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19
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20 import javax.xml.namespace.NamespaceContext;
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21 import javax.xml.namespace.QName;
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22
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23 import javax.xml.parsers.DocumentBuilderFactory;
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24 import javax.xml.parsers.ParserConfigurationException;
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25
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26 import javax.xml.transform.Transformer;
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27 import javax.xml.transform.TransformerConfigurationException;
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28 import javax.xml.transform.TransformerException;
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29 import javax.xml.transform.TransformerFactory;
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30 import javax.xml.transform.TransformerFactoryConfigurationError;
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31
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32 import javax.xml.transform.dom.DOMSource;
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33
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34 import javax.xml.transform.stream.StreamResult;
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35
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36 import javax.xml.xpath.XPath;
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37 import javax.xml.xpath.XPathConstants;
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38 import javax.xml.xpath.XPathExpressionException;
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39 import javax.xml.xpath.XPathFactory;
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40
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41 import org.apache.log4j.Logger;
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42
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43 import org.w3c.dom.Attr;
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44 import org.w3c.dom.Document;
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45 import org.w3c.dom.Element;
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46
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47 import org.xml.sax.SAXException;
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48
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49 /**
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50 * Some helper functions to ease work with XML concering namespaces, XPATH
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51 * and so on.
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52 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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53 */
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54 public final class XMLUtils
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55 {
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56 /**
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57 * W3C URL of XForms
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58 */
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59 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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60 /**
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61 * W3C prefix of XForms
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62 */
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63 public static final String XFORM_PREFIX = "xform";
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64
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65 private static Logger logger = Logger.getLogger(XMLUtils.class);
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66
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67 private XMLUtils() {
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68 }
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69
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70 /**
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71 * Helper class to generate elements and attributes with
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72 * namespaces.
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73 */
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74 public static class ElementCreator
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75 {
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76 /**
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77 * owner document of the elements to be created
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78 */
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79 protected Document document;
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80 /**
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81 * namespace to be used
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82 */
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83 protected String ns;
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84 /**
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85 * prefix to be used
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86 */
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87 protected String prefix;
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88
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89 /**
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90 * Constructor to create an element/attribute creator
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91 * with a given namespace and namespace prefix using a
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92 * given owner document.
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93 * @param document The owning document
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94 * @param ns The namespace
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95 * @param prefix The namespace prefix
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96 */
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97 public ElementCreator(Document document, String ns, String prefix) {
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98 this.document = document;
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99 this.ns = ns;
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100 this.prefix = prefix;
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101 }
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102
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103 /**
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104 * Creates a new element using the owning document with
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105 * the this creators namespace and namespace prefix.
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106 * @param name The name of the element
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107 * @return The new element
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108 */
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109 public Element create(String name) {
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110 Element element = document.createElementNS(ns, name);
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111 element.setPrefix(prefix);
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112 return element;
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113 }
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114
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115 /**
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116 * Adds a new attribute and its value to a given element.
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117 * It does not set the namespace prefix.
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118 * @param element The element to add the attribute to
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119 * @param name The name of the attribute
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120 * @param value The value of the attribute
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121 */
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122 public void addAttr(Element element, String name, String value) {
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123 addAttr(element, name, value, false);
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124 }
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125
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126 /**
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127 * Adds a new attribute and its value to a given element.
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128 * If the namespace prefix is used is decided by the 'addPrefix' flag.
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129 * @param element The element to add the attribute to
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130 * @param name The name of the attribute
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131 * @param value The value of the attribute
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132 * @param addPrefix If true the creators namespace prefix is
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133 * set on the attribute.
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134 */
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135 public void addAttr(
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136 Element element,
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137 String name,
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138 String value,
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139 boolean addPrefix
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140 ) {
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141 if (addPrefix) {
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142 Attr attr = document.createAttributeNS(ns, name);
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143 attr.setValue(value);
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144 attr.setPrefix(prefix);
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145
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146 element.setAttributeNode(attr);
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147 }
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148 else {
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149 element.setAttribute(name, value);
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150 }
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151
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152 }
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153 } // class ElementCreator
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154
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155 /**
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156 * Creates a new XML document
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157 * @return the new XML document ot null if something went wrong during
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158 * creation.
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159 */
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160 public static final Document newDocument() {
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161 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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162 factory.setNamespaceAware(true);
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163
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164 try {
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165 return factory.newDocumentBuilder().newDocument();
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166 }
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167 catch (ParserConfigurationException pce) {
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168 logger.error(pce.getLocalizedMessage(), pce);
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169 }
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170 return null;
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171 }
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172
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173 /**
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174 * Loads a XML document namespace aware from a file
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175 * @param file The file to load.
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176 * @return the XML document or null if something went wrong
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177 * during loading.
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178 */
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179 public static final Document parseDocument(File file) {
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180 InputStream inputStream = null;
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181 try {
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182 inputStream = new BufferedInputStream(new FileInputStream(file));
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183 return parseDocument(inputStream);
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184 }
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185 catch (IOException ioe) {
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186 logger.error(ioe.getLocalizedMessage(), ioe);
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187 }
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188 finally {
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189 if (inputStream != null) {
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190 try { inputStream.close(); }
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191 catch (IOException ioe) {}
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192 }
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193 }
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194 return null;
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195 }
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196
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197 public static final Document parseDocument(InputStream inputStream) {
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198 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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199 factory.setNamespaceAware(true);
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200
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201 try {
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202 return factory.newDocumentBuilder().parse(inputStream);
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203 }
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204 catch (ParserConfigurationException pce) {
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205 logger.error(pce.getLocalizedMessage(), pce);
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206 }
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207 catch (SAXException se) {
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208 logger.error(se.getLocalizedMessage(), se);
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209 }
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210 catch (IOException ioe) {
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211 logger.error(ioe.getLocalizedMessage(), ioe);
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212 }
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213 return null;
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214 }
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215
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216 /**
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217 * Creates a new XPath without a namespace context.
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218 * @return the new XPath.
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219 */
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220 public static final XPath newXPath() {
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221 return newXPath(null);
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222 }
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223
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224 /**
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225 * Creates a new XPath with a given namespace context.
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226 * @param namespaceContext The namespace context to be used or null
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227 * if none should be used.
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228 * @return The new XPath
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229 */
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230 public static final XPath newXPath(NamespaceContext namespaceContext) {
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231 XPathFactory factory = XPathFactory.newInstance();
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232 XPath xpath = factory.newXPath();
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233 if (namespaceContext != null) {
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234 xpath.setNamespaceContext(namespaceContext);
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235 }
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236 return xpath;
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237 }
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238
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239 /**
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240 * Evaluates an XPath query on a given object and returns the result
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241 * as a given type. No namespace context is used.
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242 * @param root The object which is used as the root of the tree to
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243 * be searched in.
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244 * @param query The XPath query
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245 * @param returnTyp The type of the result.
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246 * @return The result of type 'returnTyp' or null if something
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247 * went wrong during XPath evaluation.
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248 */
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249 public static final Object xpath(
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250 Object root,
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251 String query,
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252 QName returnTyp
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253 ) {
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254 return xpath(root, query, returnTyp, null);
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255 }
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256
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257 /**
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258 * Evaluates an XPath query on a given object and returns the result
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259 * as a string. A given namespace context is used.
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260 * @param root The object which is used as the root of the tree to
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261 * be searched in.
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262 * @param query The XPath query
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263 * @param namespaceContext The namespace context to be used or null
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264 * if none should be used.
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265 * @return The result of the query or null if something went wrong
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266 * during XPath evaluation.
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267 */
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268 public static final String xpathString(
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269 Object root, String query, NamespaceContext namespaceContext
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270 ) {
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271 return (String)xpath(
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272 root, query, XPathConstants.STRING, namespaceContext);
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273 }
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274
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275 /**
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276 * Evaluates an XPath query on a given object and returns the result
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277 * as a given type. Optionally a namespace context is used.
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278 * @param root The object which is used as the root of the tree to
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279 * be searched in.
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280 * @param query The XPath query
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281 * @param returnType The type of the result.
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282 * @param namespaceContext The namespace context to be used or null
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283 * if none should be used.
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284 * @return The result of type 'returnTyp' or null if something
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285 * went wrong during XPath evaluation.
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286 */
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287 public static final Object xpath(
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288 Object root,
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289 String query,
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290 QName returnType,
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291 NamespaceContext namespaceContext
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292 ) {
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293 if (root == null) {
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294 return null;
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295 }
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296
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297 try {
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298 XPath xpath = newXPath(namespaceContext);
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299 if (xpath != null) {
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300 return xpath.evaluate(query, root, returnType);
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301 }
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302 }
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303 catch (XPathExpressionException xpee) {
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304 logger.error(xpee.getLocalizedMessage(), xpee);
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305 }
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306
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307 return null;
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308 }
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309
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310 /**
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311 * Streams out an XML document to a given output stream.
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312 * @param document The document to be streamed out.
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313 * @param out The output stream to be used.
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314 * @return true if operation succeeded else false.
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315 */
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316 public static boolean toStream(Document document, OutputStream out) {
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317 try {
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318 Transformer transformer =
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319 TransformerFactory.newInstance().newTransformer();
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320 DOMSource source = new DOMSource(document);
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321 StreamResult result = new StreamResult(out);
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322 transformer.transform(source, result);
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323 return true;
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324 }
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325 catch (TransformerConfigurationException tce) {
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326 logger.error(tce.getLocalizedMessage(), tce);
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327 }
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328 catch (TransformerFactoryConfigurationError tfce) {
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329 logger.error(tfce.getLocalizedMessage(), tfce);
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330 }
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331 catch (TransformerException te) {
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332 logger.error(te.getLocalizedMessage(), te);
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333 }
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334
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335 return false;
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336 }
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337
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338 /**
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339 * Transforms an XML document into a byte array.
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340 * @param document The document to be streamed out.
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341 * @return the byte array or null if operation failed or
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342 * document is null.
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343 */
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344 public static byte [] toByteArray(Document document) {
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345 if (document == null) {
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346 return null;
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347 }
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348 ByteArrayOutputStream baos = new ByteArrayOutputStream();
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349 return toStream(document, baos)
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350 ? baos.toByteArray()
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351 : null;
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352 }
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353
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354 public static Document fromByteArray(byte [] data) {
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355 if (data == null) {
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356 return null;
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357 }
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358 return parseDocument(new ByteArrayInputStream(data));
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359 }
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360 }
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361 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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