Mercurial > dive4elements > river

annotate etl/src/main/java/org/dive4elements/river/etl/utils/XML.java @ 7146:414794d0a50d

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Add label for bed difference axis
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 25 Sep 2013 15:08:18 +0200
parents 6f80d5f375fd
children 0a5239a1e46e
rev   line source
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.etl.utils;
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10
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11 import java.io.BufferedInputStream;
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12 import java.io.File;
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13 import java.io.FileInputStream;
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14 import java.io.IOException;
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15 import java.io.InputStream;
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16 import java.io.OutputStream;
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17 import java.io.StringWriter;
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18
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19 import java.util.HashMap;
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20 import java.util.Map;
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21
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22 import javax.xml.namespace.NamespaceContext;
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23 import javax.xml.namespace.QName;
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24
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25 import javax.xml.parsers.DocumentBuilderFactory;
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26 import javax.xml.parsers.ParserConfigurationException;
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27
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28 import javax.xml.transform.Transformer;
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29 import javax.xml.transform.TransformerConfigurationException;
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30 import javax.xml.transform.TransformerException;
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31 import javax.xml.transform.TransformerFactory;
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32 import javax.xml.transform.TransformerFactoryConfigurationError;
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33
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34 import javax.xml.transform.dom.DOMResult;
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35 import javax.xml.transform.dom.DOMSource;
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36
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37 import javax.xml.transform.stream.StreamResult;
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38 import javax.xml.transform.stream.StreamSource;
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39
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40 import javax.xml.xpath.XPath;
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41 import javax.xml.xpath.XPathExpressionException;
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42 import javax.xml.xpath.XPathFactory;
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43 import javax.xml.xpath.XPathVariableResolver;
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44
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45 import org.apache.log4j.Logger;
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46
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47 import org.w3c.dom.Document;
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48
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49 import org.xml.sax.SAXException;
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50
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51 public final class XML
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52 {
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53 /** Logger for this class. */
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54 private static Logger log = Logger.getLogger(XML.class);
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55
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56 public static class MapXPathVariableResolver
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57 implements XPathVariableResolver
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58 {
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59 protected Map<String, String> variables;
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60
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61
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62 public MapXPathVariableResolver() {
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63 this.variables = new HashMap<String, String>();
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64 }
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65
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66
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67 public MapXPathVariableResolver(Map<String, String> variables) {
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68 this.variables = variables;
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69 }
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70
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71
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72 public void addVariable(String name, String value) {
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73 variables.put(name, value);
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74 }
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75
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76
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77 @Override
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78 public Object resolveVariable(QName variableName) {
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79 String key = variableName.getLocalPart();
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80 return variables.get(key);
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81 }
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82 } // class MapXPathVariableResolver
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83
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84 private XML() {
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85 }
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86
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87 /**
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88 * Creates a new XML document
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89 * @return the new XML document ot null if something went wrong during
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90 * creation.
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91 */
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92 public static final Document newDocument() {
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93 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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94 factory.setNamespaceAware(true);
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95
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96 try {
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97 return factory.newDocumentBuilder().newDocument();
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98 }
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99 catch (ParserConfigurationException pce) {
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100 log.error(pce.getLocalizedMessage(), pce);
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101 }
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102 return null;
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103 }
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104
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105 /**
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106 * Loads a XML document namespace aware from a file
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107 * @param file The file to load.
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108 * @return the XML document or null if something went wrong
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109 * during loading.
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110 */
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111 public static final Document parseDocument(File file) {
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112 return parseDocument(file, Boolean.TRUE);
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113 }
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114
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115 public static final Document parseDocument(File file, Boolean namespaceAware) {
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116 InputStream inputStream = null;
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117 try {
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118 inputStream = new BufferedInputStream(new FileInputStream(file));
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119 return parseDocument(inputStream, namespaceAware);
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120 }
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121 catch (IOException ioe) {
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122 log.error(ioe.getLocalizedMessage(), ioe);
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123 }
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124 finally {
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125 if (inputStream != null) {
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126 try { inputStream.close(); }
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127 catch (IOException ioe) {}
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128 }
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129 }
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130 return null;
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131 }
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132
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133
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134 public static final Document parseDocument(InputStream inputStream) {
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135 return parseDocument(inputStream, Boolean.TRUE);
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136 }
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137
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138 public static final Document parseDocument(
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139 InputStream inputStream,
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140 Boolean namespaceAware
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141 ) {
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142 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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143
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144 if (namespaceAware != null) {
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145 factory.setNamespaceAware(namespaceAware.booleanValue());
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146 }
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147
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148 try {
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149 return factory.newDocumentBuilder().parse(inputStream);
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150 }
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151 catch (ParserConfigurationException pce) {
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152 log.error(pce.getLocalizedMessage(), pce);
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153 }
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154 catch (SAXException se) {
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155 log.error(se.getLocalizedMessage(), se);
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156 }
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157 catch (IOException ioe) {
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158 log.error(ioe.getLocalizedMessage(), ioe);
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159 }
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160 return null;
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161 }
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162
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163
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164 /**
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165 * Creates a new XPath without a namespace context.
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166 * @return the new XPath.
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167 */
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168 public static final XPath newXPath() {
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169 return newXPath(null, null);
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170 }
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171
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172 /**
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173 * Creates a new XPath with a given namespace context.
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174 * @param namespaceContext The namespace context to be used or null
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175 * if none should be used.
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176 * @return The new XPath
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177 */
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178 public static final XPath newXPath(
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179 NamespaceContext namespaceContext,
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180 XPathVariableResolver resolver)
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181 {
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182 XPathFactory factory = XPathFactory.newInstance();
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183 XPath xpath = factory.newXPath();
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184 if (namespaceContext != null) {
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185 xpath.setNamespaceContext(namespaceContext);
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186 }
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187
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188 if (resolver != null) {
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189 xpath.setXPathVariableResolver(resolver);
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190 }
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191 return xpath;
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192 }
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193
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194 /**
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195 * Evaluates an XPath query on a given object and returns the result
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196 * as a given type. No namespace context is used.
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197 * @param root The object which is used as the root of the tree to
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198 * be searched in.
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199 * @param query The XPath query
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200 * @param returnTyp The type of the result.
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201 * @return The result of type 'returnTyp' or null if something
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202 * went wrong during XPath evaluation.
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203 */
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204 public static final Object xpath(
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205 Object root,
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parents:
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206 String query,
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diff changeset
207 QName returnTyp
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208 ) {
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209 return xpath(root, query, returnTyp, null);
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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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diff changeset
214 * as a given type. Optionally a 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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parents:
diff changeset
216 * be searched in.
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217 * @param query The XPath query
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218 * @param returnType The type of the result.
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219 * @param namespaceContext The namespace context to be used or null
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220 * if none should be used.
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parents:
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221 * @return The result of type 'returnTyp' or null if something
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222 * went wrong during XPath evaluation.
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diff changeset
223 */
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diff changeset
224 public static final Object xpath(
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diff changeset
225 Object root,
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parents:
diff changeset
226 String query,
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parents:
diff changeset
227 QName returnType,
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parents:
diff changeset
228 NamespaceContext namespaceContext
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229 ) {
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230 return xpath(root, query, returnType, namespaceContext, null);
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parents:
diff changeset
231 }
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parents:
diff changeset
232
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diff changeset
233 public static final Object xpath(
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parents:
diff changeset
234 Object root,
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parents:
diff changeset
235 String query,
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parents:
diff changeset
236 QName returnType,
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parents:
diff changeset
237 NamespaceContext namespaceContext,
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parents:
diff changeset
238 Map<String, String> variables)
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parents:
diff changeset
239 {
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parents:
diff changeset
240 if (root == null) {
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parents:
diff changeset
241 return null;
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parents:
diff changeset
242 }
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parents:
diff changeset
243
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parents:
diff changeset
244 XPathVariableResolver resolver = variables != null
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
245 ? new MapXPathVariableResolver(variables)
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parents:
diff changeset
246 : null;
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parents:
diff changeset
247
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diff changeset
248 try {
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diff changeset
249 XPath xpath = newXPath(namespaceContext, resolver);
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parents:
diff changeset
250 if (xpath != null) {
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parents:
diff changeset
251 return xpath.evaluate(query, root, returnType);
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parents:
diff changeset
252 }
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parents:
diff changeset
253 }
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parents:
diff changeset
254 catch (XPathExpressionException xpee) {
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parents:
diff changeset
255 log.error(xpee.getLocalizedMessage(), xpee);
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parents:
diff changeset
256 }
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parents:
diff changeset
257
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diff changeset
258 return null;
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parents:
diff changeset
259 }
4083
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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diff changeset
260
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
261 public static Document transform(
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parents: 4072
diff changeset
262 Document document,
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parents: 4072
diff changeset
263 File xformFile
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parents: 4072
diff changeset
264 ) {
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4072
diff changeset
265 try {
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parents: 4072
diff changeset
266 Transformer transformer =
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4072
diff changeset
267 TransformerFactory
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parents: 4072
diff changeset
268 .newInstance()
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
269 .newTransformer(
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
270 new StreamSource(xformFile));
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diff changeset
271
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
272 DOMResult result = new DOMResult();
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
273
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
274 transformer.transform(new DOMSource(document), result);
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parents: 4072
diff changeset
275
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
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276 return (Document)result.getNode();
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277 }
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278 catch (TransformerConfigurationException tce) {
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279 log.error(tce, tce);
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280 }
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281 catch (TransformerException te) {
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282 log.error(te, te);
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283 }
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284
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285 return null;
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286 }
4095
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287
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288 /**
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289 * Streams out an XML document to a given output stream.
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290 * @param document The document to be streamed out.
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291 * @param out The output stream to be used.
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292 * @return true if operation succeeded else false.
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293 */
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294 public static boolean toStream(Document document, OutputStream out) {
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295 try {
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296 Transformer transformer =
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297 TransformerFactory.newInstance().newTransformer();
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298 DOMSource source = new DOMSource(document);
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299 StreamResult result = new StreamResult(out);
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300 transformer.transform(source, result);
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301 return true;
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302 }
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303 catch (TransformerConfigurationException tce) {
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304 log.error(tce.getLocalizedMessage(), tce);
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305 }
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306 catch (TransformerFactoryConfigurationError tfce) {
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307 log.error(tfce.getLocalizedMessage(), tfce);
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308 }
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309 catch (TransformerException te) {
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310 log.error(te.getLocalizedMessage(), te);
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311 }
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312
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313 return false;
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314 }
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315
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316 public static String toString(Document document) {
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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 StringWriter out = new StringWriter();
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322 StreamResult result = new StreamResult(out);
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323 transformer.transform(source, result);
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324 out.flush();
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325 return out.toString();
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326 }
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327 catch (TransformerConfigurationException tce) {
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328 log.error(tce.getLocalizedMessage(), tce);
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329 }
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330 catch (TransformerFactoryConfigurationError tfce) {
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331 log.error(tfce.getLocalizedMessage(), tfce);
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332 }
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333 catch (TransformerException te) {
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334 log.error(te.getLocalizedMessage(), te);
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335 }
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336
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337 return null;
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338 }
4070
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339 }
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340 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org