Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/XMLUtils.java @ 91:730ff077a58c

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More javadoc, some code formatting. artifacts/trunk@847 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 28 Mar 2010 10:01:03 +0000
parents 48d1a9a082c2
children 73d0ebae81d7
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import java.io.File;
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4 import java.io.IOException;
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5 import java.io.OutputStream;
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6
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7 import javax.xml.namespace.NamespaceContext;
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8 import javax.xml.namespace.QName;
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9
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10 import javax.xml.parsers.DocumentBuilderFactory;
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11 import javax.xml.parsers.ParserConfigurationException;
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12
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13 import javax.xml.transform.Transformer;
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14 import javax.xml.transform.TransformerConfigurationException;
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15 import javax.xml.transform.TransformerException;
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16 import javax.xml.transform.TransformerFactory;
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17 import javax.xml.transform.TransformerFactoryConfigurationError;
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18
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19 import javax.xml.transform.dom.DOMSource;
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21 import javax.xml.transform.stream.StreamResult;
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22
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23 import javax.xml.xpath.XPath;
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24 import javax.xml.xpath.XPathConstants;
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25 import javax.xml.xpath.XPathExpressionException;
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26 import javax.xml.xpath.XPathFactory;
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28 import org.apache.log4j.Logger;
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29
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30 import org.w3c.dom.Attr;
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31 import org.w3c.dom.Document;
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32 import org.w3c.dom.Element;
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33
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34 import org.xml.sax.SAXException;
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35
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36 /**
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37 * Some helper functions to ease work with XML concering namespaces, XPATH
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38 * and so on.
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39 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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40 */
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41 public final class XMLUtils
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42 {
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43 /**
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44 * W3C URL of XForms
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45 */
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46 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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47 /**
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48 * W3C prefix of XForms
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49 */
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50 public static final String XFORM_PREFIX = "xform";
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52 private static Logger logger = Logger.getLogger(XMLUtils.class);
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53
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54 private XMLUtils() {
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55 }
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57 /**
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58 * Helper class to generate elements and attributes with
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59 * namespaces.
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60 */
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61 public static class ElementCreator
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62 {
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63 /**
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64 * owner document of the elements to be created
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65 */
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66 protected Document document;
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67 /**
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68 * namespace to be used
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69 */
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70 protected String ns;
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71 /**
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72 * prefix to be used
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73 */
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74 protected String prefix;
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75
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76 /**
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77 * Constructor to create an element/attribute creator
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78 * with a given namespace and namespace prefix using a
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79 * given owner document.
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80 * @param document The owning document
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81 * @param ns The namespace
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82 * @param prefix The namespace prefix
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83 */
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84 public ElementCreator(Document document, String ns, String prefix) {
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85 this.document = document;
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86 this.ns = ns;
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87 this.prefix = prefix;
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88 }
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89
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90 /**
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91 * Creates a new element using the owning document with
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92 * the this creators namespace and namespace prefix.
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93 * @param name The name of the element
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94 * @return The new element
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95 */
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96 public Element create(String name) {
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97 Element element = document.createElementNS(ns, name);
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98 element.setPrefix(prefix);
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99 return element;
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100 }
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101
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102 /**
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103 * Adds a new attribute and its value to a given element.
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104 * It does not set the namespace prefix.
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105 * @param element The element to add the attribute to
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106 * @param name The name of the attribute
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107 * @param value The value of the attribute
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108 */
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109 public void addAttr(Element element, String name, String value) {
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110 addAttr(element, name, value, false);
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111 }
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112
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113 /**
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114 * Adds a new attribute and its value to a given element.
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115 * If the namespace prefix is used is decided by the 'addPrefix' flag.
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116 * @param element The element to add the attribute to
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117 * @param name The name of the attribute
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118 * @param value The value of the attribute
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119 * @param addPrefix If true the creators namespace prefix is
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120 * set on the attribute.
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121 */
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122 public void addAttr(
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123 Element element,
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124 String name,
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125 String value,
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126 boolean addPrefix
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127 ) {
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128 Attr attr = document.createAttributeNS(ns, name);
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129 attr.setValue(value);
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130
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131 if (addPrefix)
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132 attr.setPrefix(prefix);
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133
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134 element.setAttributeNode(attr);
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135 }
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136 } // class ElementCreator
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137
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138 /**
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139 * Creates a new XML document
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140 * @return the new XML document ot null if something went wrong during
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141 * creation.
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142 */
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143 public static final Document newDocument() {
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144 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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145 factory.setNamespaceAware(true);
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146
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147 try {
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148 return factory.newDocumentBuilder().newDocument();
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149 }
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150 catch (ParserConfigurationException pce) {
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151 logger.error(pce.getLocalizedMessage(), pce);
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152 }
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153 return null;
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154 }
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155
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156 /**
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157 * Loads a XML document namespace aware from a file
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158 * @param file The file to load.
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159 * @return the XML document or null if something went wrong
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160 * during loading.
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161 */
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162 public static final Document parseDocument(File file) {
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163 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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164 factory.setNamespaceAware(true);
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165
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166 try {
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167 return factory.newDocumentBuilder().parse(file);
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168 }
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169 catch (ParserConfigurationException pce) {
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170 logger.error(pce.getLocalizedMessage(), pce);
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171 }
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172 catch (SAXException se) {
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173 logger.error(se.getLocalizedMessage(), se);
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174 }
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175 catch (IOException ioe) {
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176 logger.error(ioe.getLocalizedMessage(), ioe);
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177 }
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178 return null;
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179 }
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180
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181 /**
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182 * Creates a new XPath without a namespace context.
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183 * @return the new XPath.
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184 */
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185 public static final XPath newXPath() {
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186 return newXPath(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 with a given namespace context.
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191 * @param namespaceContext The namespace context to be used or null
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192 * if none should be used.
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193 * @return The new XPath
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194 */
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195 public static final XPath newXPath(NamespaceContext namespaceContext) {
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196 XPathFactory factory = XPathFactory.newInstance();
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197 XPath xpath = factory.newXPath();
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198 if (namespaceContext != null) {
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199 xpath.setNamespaceContext(namespaceContext);
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200 }
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201 return xpath;
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202 }
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203
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204 /**
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205 * Evaluates an XPath query on a given object and returns the result
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206 * as a given type. No namespace context is used.
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207 * @param root The object which is used as the root of the tree to
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208 * be searched in.
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209 * @param query The XPath query
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210 * @param returnTyp The type of the result.
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211 * @return The result of type 'returnTyp' or null if something
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212 * went wrong during XPath evaluation.
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213 */
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214 public static final Object xpath(Object root, String query, QName returnTyp) {
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215 return xpath(root, query, returnTyp, null);
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216 }
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217
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218 /**
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219 * Evaluates an XPath query on a given objectr and returns the result
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220 * as a string. A given namespace context is used.
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221 * @param root The object which is used as the root of the tree to
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222 * be searched in.
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223 * @param query The XPath query
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224 * @param namespaceContext The namespace context to be used or null
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225 * if none should be used.
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226 * @return The result of the query or null if something went wrong
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227 * during XPath evaluation.
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228 */
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229 public static final String xpathString(
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230 Object root, String query, NamespaceContext namespaceContext
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231 ) {
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232 return (String)xpath(
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233 root, query, XPathConstants.STRING, namespaceContext);
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234 }
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235
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236 /**
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237 * Evaluates an XPath query on a given object and returns the result
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238 * as a given type. Optionally a namespace context is used.
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239 * @param root The object which is used as the root of the tree to
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240 * be searched in.
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241 * @param query The XPath query
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242 * @param returnType The type of the result.
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243 * @param namespaceContext The namespace context to be used or null
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244 * if none should be used.
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245 * @return The result of type 'returnTyp' or null if something
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246 * went wrong during XPath evaluation.
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247 */
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248 public static final Object xpath(
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249 Object root,
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250 String query,
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251 QName returnType,
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252 NamespaceContext namespaceContext
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253 ) {
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254 if (root == null) {
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255 return null;
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256 }
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257
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258 try {
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259 XPath xpath = newXPath(namespaceContext);
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260 if (xpath != null) {
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261 return xpath.evaluate(query, root, returnType);
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262 }
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263 }
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264 catch (XPathExpressionException xpee) {
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265 logger.error(xpee.getLocalizedMessage(), xpee);
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266 }
25
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267
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268 return null;
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269 }
67
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270
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271 /**
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272 * Streams out an XML document to a given output stream.
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273 * @param document The document to be streamed out.
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274 * @param out The output stream to be used.
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275 * @return true if operation succeeded else false.
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276 */
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277 public static boolean toStream(Document document, OutputStream out) {
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278 try {
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279 Transformer transformer =
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280 TransformerFactory.newInstance().newTransformer();
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281 DOMSource source = new DOMSource(document);
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282 StreamResult result = new StreamResult(out);
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283 transformer.transform(source, result);
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284 return true;
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285 }
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286 catch (TransformerConfigurationException tce) {
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287 logger.error(tce.getLocalizedMessage(), tce);
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288 }
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289 catch (TransformerFactoryConfigurationError tfce) {
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290 logger.error(tfce.getLocalizedMessage(), tfce);
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291 }
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292 catch (TransformerException te) {
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293 logger.error(te.getLocalizedMessage(), te);
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294 }
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295
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296 return false;
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297 }
20
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298 }
91
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299 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org