Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/XMLUtils.java @ 104:26bfff409dd3

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Added interfaces and engines used in concrete artifact packages. artifacts/trunk@1289 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 03 Feb 2011 18:00:41 +0000
parents 933bbc9fc11f
children
rev   line source
100
933bbc9fc11f Added license file and license headers.
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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.artifactdatabase;
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10
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11 import java.io.File;
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12 import java.io.IOException;
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13 import java.io.OutputStream;
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14
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15 import javax.xml.namespace.NamespaceContext;
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16 import javax.xml.namespace.QName;
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17
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18 import javax.xml.parsers.DocumentBuilderFactory;
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19 import javax.xml.parsers.ParserConfigurationException;
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20
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21 import javax.xml.transform.Transformer;
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22 import javax.xml.transform.TransformerConfigurationException;
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23 import javax.xml.transform.TransformerException;
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24 import javax.xml.transform.TransformerFactory;
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25 import javax.xml.transform.TransformerFactoryConfigurationError;
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26
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27 import javax.xml.transform.dom.DOMSource;
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28
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29 import javax.xml.transform.stream.StreamResult;
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30
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31 import javax.xml.xpath.XPath;
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32 import javax.xml.xpath.XPathConstants;
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33 import javax.xml.xpath.XPathExpressionException;
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34 import javax.xml.xpath.XPathFactory;
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35
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36 import org.apache.log4j.Logger;
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37
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38 import org.w3c.dom.Attr;
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39 import org.w3c.dom.Document;
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40 import org.w3c.dom.Element;
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41
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42 import org.xml.sax.SAXException;
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43
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44 /**
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45 * Some helper functions to ease work with XML concering namespaces, XPATH
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46 * and so on.
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47 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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48 */
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49 public final class XMLUtils
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50 {
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51 /**
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52 * W3C URL of XForms
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53 */
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54 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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55 /**
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56 * W3C prefix of XForms
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57 */
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58 public static final String XFORM_PREFIX = "xform";
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60 private static Logger logger = Logger.getLogger(XMLUtils.class);
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61
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62 private XMLUtils() {
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63 }
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65 /**
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66 * Helper class to generate elements and attributes with
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67 * namespaces.
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68 */
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69 public static class ElementCreator
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70 {
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71 /**
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72 * owner document of the elements to be created
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73 */
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74 protected Document document;
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75 /**
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76 * namespace to be used
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77 */
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78 protected String ns;
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79 /**
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80 * prefix to be used
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81 */
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82 protected String prefix;
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83
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84 /**
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85 * Constructor to create an element/attribute creator
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86 * with a given namespace and namespace prefix using a
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87 * given owner document.
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88 * @param document The owning document
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89 * @param ns The namespace
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90 * @param prefix The namespace prefix
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91 */
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92 public ElementCreator(Document document, String ns, String prefix) {
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93 this.document = document;
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94 this.ns = ns;
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95 this.prefix = prefix;
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96 }
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98 /**
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99 * Creates a new element using the owning document with
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100 * the this creators namespace and namespace prefix.
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101 * @param name The name of the element
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102 * @return The new element
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103 */
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104 public Element create(String name) {
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105 Element element = document.createElementNS(ns, name);
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106 element.setPrefix(prefix);
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107 return element;
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108 }
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109
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110 /**
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111 * Adds a new attribute and its value to a given element.
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112 * It does not set the namespace prefix.
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113 * @param element The element to add the attribute to
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114 * @param name The name of the attribute
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115 * @param value The value of the attribute
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116 */
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117 public void addAttr(Element element, String name, String value) {
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118 addAttr(element, name, value, false);
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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 * If the namespace prefix is used is decided by the 'addPrefix' flag.
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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 * @param addPrefix If true the creators namespace prefix is
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128 * set on the attribute.
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129 */
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130 public void addAttr(
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131 Element element,
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132 String name,
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133 String value,
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134 boolean addPrefix
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135 ) {
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136 Attr attr = document.createAttributeNS(ns, name);
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137 attr.setValue(value);
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138
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139 if (addPrefix)
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140 attr.setPrefix(prefix);
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141
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142 element.setAttributeNode(attr);
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143 }
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144 } // class ElementCreator
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145
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146 /**
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147 * Creates a new XML document
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148 * @return the new XML document ot null if something went wrong during
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149 * creation.
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150 */
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151 public static final Document newDocument() {
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152 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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153 factory.setNamespaceAware(true);
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154
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155 try {
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156 return factory.newDocumentBuilder().newDocument();
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157 }
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158 catch (ParserConfigurationException pce) {
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159 logger.error(pce.getLocalizedMessage(), pce);
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160 }
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161 return null;
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162 }
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163
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164 /**
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165 * Loads a XML document namespace aware from a file
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166 * @param file The file to load.
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167 * @return the XML document or null if something went wrong
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168 * during loading.
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169 */
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170 public static final Document parseDocument(File file) {
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171 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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172 factory.setNamespaceAware(true);
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173
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174 try {
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175 return factory.newDocumentBuilder().parse(file);
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176 }
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177 catch (ParserConfigurationException pce) {
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178 logger.error(pce.getLocalizedMessage(), pce);
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179 }
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180 catch (SAXException se) {
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181 logger.error(se.getLocalizedMessage(), se);
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182 }
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183 catch (IOException ioe) {
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184 logger.error(ioe.getLocalizedMessage(), ioe);
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185 }
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186 return null;
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187 }
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188
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189 /**
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190 * Creates a new XPath without a namespace context.
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191 * @return the new XPath.
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192 */
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193 public static final XPath newXPath() {
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194 return newXPath(null);
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195 }
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196
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197 /**
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198 * Creates a new XPath with a given namespace context.
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199 * @param namespaceContext The namespace context to be used or null
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200 * if none should be used.
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201 * @return The new XPath
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202 */
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203 public static final XPath newXPath(NamespaceContext namespaceContext) {
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204 XPathFactory factory = XPathFactory.newInstance();
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205 XPath xpath = factory.newXPath();
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206 if (namespaceContext != null) {
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207 xpath.setNamespaceContext(namespaceContext);
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208 }
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209 return xpath;
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210 }
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211
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212 /**
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213 * Evaluates an XPath query on a given object and returns the result
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214 * as a given type. No namespace context is used.
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215 * @param root The object which is used as the root of the tree to
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216 * be searched in.
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217 * @param query The XPath query
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218 * @param returnTyp The type of the result.
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219 * @return The result of type 'returnTyp' or null if something
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220 * went wrong during XPath evaluation.
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221 */
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222 public static final Object xpath(
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223 Object root,
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224 String query,
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225 QName returnTyp
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226 ) {
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227 return xpath(root, query, returnTyp, null);
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228 }
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229
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230 /**
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231 * Evaluates an XPath query on a given object and returns the result
91
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232 * as a string. A given namespace context is used.
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233 * @param root The object which is used as the root of the tree to
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234 * be searched in.
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235 * @param query The XPath query
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236 * @param namespaceContext The namespace context to be used or null
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237 * if none should be used.
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238 * @return The result of the query or null if something went wrong
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239 * during XPath evaluation.
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240 */
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241 public static final String xpathString(
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242 Object root, String query, NamespaceContext namespaceContext
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243 ) {
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244 return (String)xpath(
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245 root, query, XPathConstants.STRING, namespaceContext);
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246 }
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247
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248 /**
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249 * Evaluates an XPath query on a given object and returns the result
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250 * as a given type. Optionally a namespace context is used.
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251 * @param root The object which is used as the root of the tree to
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252 * be searched in.
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253 * @param query The XPath query
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254 * @param returnType The type of the result.
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255 * @param namespaceContext The namespace context to be used or null
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256 * if none should be used.
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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 */
25
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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 returnType,
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264 NamespaceContext namespaceContext
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265 ) {
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266 if (root == null) {
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267 return null;
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268 }
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269
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270 try {
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271 XPath xpath = newXPath(namespaceContext);
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272 if (xpath != null) {
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273 return xpath.evaluate(query, root, returnType);
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274 }
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275 }
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276 catch (XPathExpressionException xpee) {
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277 logger.error(xpee.getLocalizedMessage(), xpee);
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278 }
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279
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280 return null;
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281 }
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282
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283 /**
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284 * Streams out an XML document to a given output stream.
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285 * @param document The document to be streamed out.
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286 * @param out The output stream to be used.
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287 * @return true if operation succeeded else false.
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288 */
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289 public static boolean toStream(Document document, OutputStream out) {
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290 try {
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291 Transformer transformer =
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292 TransformerFactory.newInstance().newTransformer();
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293 DOMSource source = new DOMSource(document);
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294 StreamResult result = new StreamResult(out);
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295 transformer.transform(source, result);
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296 return true;
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297 }
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298 catch (TransformerConfigurationException tce) {
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299 logger.error(tce.getLocalizedMessage(), tce);
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300 }
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301 catch (TransformerFactoryConfigurationError tfce) {
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302 logger.error(tfce.getLocalizedMessage(), tfce);
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303 }
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304 catch (TransformerException te) {
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305 logger.error(te.getLocalizedMessage(), te);
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306 }
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307
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308 return false;
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309 }
20
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310 }
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311 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org