Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/utils/XML.java @ 4350:4ac69bb4b39d

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flys-client: Show NaviOutput-Tab also for extreme_wq_curve.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 01 Nov 2012 12:29:24 +0100
parents da9df3641578
children b195fede1c3b
rev   line source
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diff changeset
1 package de.intevation.utils;
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2
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3 import java.io.FileInputStream;
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4 import java.io.BufferedInputStream;
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5 import java.io.File;
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6 import java.io.IOException;
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7 import java.io.InputStream;
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8 import java.io.OutputStream;
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9 import java.io.StringWriter;
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10
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11 import org.w3c.dom.Document;
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12
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13 import javax.xml.parsers.DocumentBuilderFactory;
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14 import javax.xml.parsers.ParserConfigurationException;
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15
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16 import org.xml.sax.SAXException;
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17
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18 import org.apache.log4j.Logger;
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19
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20 import java.util.HashMap;
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21 import java.util.Map;
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22
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23 import javax.xml.namespace.NamespaceContext;
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24 import javax.xml.namespace.QName;
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25
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26 import javax.xml.xpath.XPath;
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27 import javax.xml.xpath.XPathExpressionException;
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28 import javax.xml.xpath.XPathFactory;
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29 import javax.xml.xpath.XPathVariableResolver;
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30
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31 import javax.xml.transform.Transformer;
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32 import javax.xml.transform.TransformerFactory;
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33 import javax.xml.transform.TransformerConfigurationException;
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34 import javax.xml.transform.TransformerException;
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35 import javax.xml.transform.TransformerFactoryConfigurationError;
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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.transform.dom.DOMSource;
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41 import javax.xml.transform.dom.DOMResult;
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42
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43 public final class XML
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44 {
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45 /** Logger for this class. */
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46 private static Logger log = Logger.getLogger(XML.class);
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47
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48 public static class MapXPathVariableResolver
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49 implements XPathVariableResolver
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50 {
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51 protected Map<String, String> variables;
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52
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53
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54 public MapXPathVariableResolver() {
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55 this.variables = new HashMap<String, String>();
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56 }
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57
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58
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59 public MapXPathVariableResolver(Map<String, String> variables) {
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60 this.variables = variables;
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61 }
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62
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63
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64 public void addVariable(String name, String value) {
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65 variables.put(name, value);
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66 }
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67
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68
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69 @Override
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70 public Object resolveVariable(QName variableName) {
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71 String key = variableName.getLocalPart();
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72 return variables.get(key);
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73 }
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74 } // class MapXPathVariableResolver
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75
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76 private XML() {
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77 }
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78
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79 /**
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80 * Creates a new XML document
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81 * @return the new XML document ot null if something went wrong during
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82 * creation.
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83 */
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84 public static final Document newDocument() {
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85 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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86 factory.setNamespaceAware(true);
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87
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88 try {
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89 return factory.newDocumentBuilder().newDocument();
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90 }
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91 catch (ParserConfigurationException pce) {
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92 log.error(pce.getLocalizedMessage(), pce);
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93 }
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94 return null;
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95 }
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96
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97 /**
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98 * Loads a XML document namespace aware from a file
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99 * @param file The file to load.
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100 * @return the XML document or null if something went wrong
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101 * during loading.
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102 */
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103 public static final Document parseDocument(File file) {
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104 return parseDocument(file, Boolean.TRUE);
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105 }
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106
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107 public static final Document parseDocument(File file, Boolean namespaceAware) {
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108 InputStream inputStream = null;
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109 try {
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110 inputStream = new BufferedInputStream(new FileInputStream(file));
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111 return parseDocument(inputStream, namespaceAware);
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112 }
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113 catch (IOException ioe) {
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114 log.error(ioe.getLocalizedMessage(), ioe);
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115 }
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116 finally {
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117 if (inputStream != null) {
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118 try { inputStream.close(); }
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119 catch (IOException ioe) {}
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120 }
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121 }
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122 return null;
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123 }
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124
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125
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126 public static final Document parseDocument(InputStream inputStream) {
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127 return parseDocument(inputStream, Boolean.TRUE);
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128 }
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129
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130 public static final Document parseDocument(
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131 InputStream inputStream,
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132 Boolean namespaceAware
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133 ) {
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134 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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135
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136 if (namespaceAware != null) {
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137 factory.setNamespaceAware(namespaceAware.booleanValue());
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138 }
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139
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140 try {
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141 return factory.newDocumentBuilder().parse(inputStream);
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142 }
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143 catch (ParserConfigurationException pce) {
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144 log.error(pce.getLocalizedMessage(), pce);
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145 }
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146 catch (SAXException se) {
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147 log.error(se.getLocalizedMessage(), se);
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148 }
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149 catch (IOException ioe) {
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150 log.error(ioe.getLocalizedMessage(), ioe);
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151 }
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152 return null;
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153 }
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154
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155
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156 /**
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157 * Creates a new XPath without a namespace context.
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158 * @return the new XPath.
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159 */
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160 public static final XPath newXPath() {
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161 return newXPath(null, null);
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162 }
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163
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164 /**
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165 * Creates a new XPath with a given namespace context.
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166 * @param namespaceContext The namespace context to be used or null
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167 * if none should be used.
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168 * @return The new XPath
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169 */
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170 public static final XPath newXPath(
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171 NamespaceContext namespaceContext,
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172 XPathVariableResolver resolver)
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173 {
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174 XPathFactory factory = XPathFactory.newInstance();
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175 XPath xpath = factory.newXPath();
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176 if (namespaceContext != null) {
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177 xpath.setNamespaceContext(namespaceContext);
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178 }
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179
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180 if (resolver != null) {
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181 xpath.setXPathVariableResolver(resolver);
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182 }
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183 return xpath;
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184 }
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185
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186 /**
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187 * Evaluates an XPath query on a given object and returns the result
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188 * as a given type. No namespace context is used.
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189 * @param root The object which is used as the root of the tree to
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190 * be searched in.
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191 * @param query The XPath query
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192 * @param returnTyp The type of the result.
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193 * @return The result of type 'returnTyp' or null if something
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194 * went wrong during XPath evaluation.
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195 */
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196 public static final Object xpath(
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197 Object root,
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198 String query,
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199 QName returnTyp
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200 ) {
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201 return xpath(root, query, returnTyp, null);
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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. Optionally a 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 returnType The type of the result.
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211 * @param namespaceContext The namespace context to be used or null
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212 * if none should be used.
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213 * @return The result of type 'returnTyp' or null if something
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214 * went wrong during XPath evaluation.
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215 */
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216 public static final Object xpath(
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217 Object root,
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218 String query,
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219 QName returnType,
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220 NamespaceContext namespaceContext
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221 ) {
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222 return xpath(root, query, returnType, namespaceContext, null);
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223 }
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224
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225 public static final Object xpath(
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226 Object root,
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227 String query,
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228 QName returnType,
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229 NamespaceContext namespaceContext,
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230 Map<String, String> variables)
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231 {
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232 if (root == null) {
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233 return null;
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234 }
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235
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236 XPathVariableResolver resolver = variables != null
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237 ? new MapXPathVariableResolver(variables)
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238 : null;
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parents:
diff changeset
239
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diff changeset
240 try {
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diff changeset
241 XPath xpath = newXPath(namespaceContext, resolver);
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diff changeset
242 if (xpath != null) {
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diff changeset
243 return xpath.evaluate(query, root, returnType);
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diff changeset
244 }
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parents:
diff changeset
245 }
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diff changeset
246 catch (XPathExpressionException xpee) {
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247 log.error(xpee.getLocalizedMessage(), xpee);
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248 }
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249
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250 return null;
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diff changeset
251 }
4083
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252
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253 public static Document transform(
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254 Document document,
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diff changeset
255 File xformFile
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256 ) {
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diff changeset
257 try {
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258 Transformer transformer =
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diff changeset
259 TransformerFactory
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diff changeset
260 .newInstance()
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diff changeset
261 .newTransformer(
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diff changeset
262 new StreamSource(xformFile));
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263
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diff changeset
264 DOMResult result = new DOMResult();
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diff changeset
265
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diff changeset
266 transformer.transform(new DOMSource(document), result);
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267
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268 return (Document)result.getNode();
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269 }
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diff changeset
270 catch (TransformerConfigurationException tce) {
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diff changeset
271 log.error(tce, tce);
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diff changeset
272 }
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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diff changeset
273 catch (TransformerException te) {
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parents: 4072
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274 log.error(te, te);
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275 }
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276
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277 return null;
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278 }
4095
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279
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280 /**
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281 * Streams out an XML document to a given output stream.
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282 * @param document The document to be streamed out.
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283 * @param out The output stream to be used.
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284 * @return true if operation succeeded else false.
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285 */
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286 public static boolean toStream(Document document, OutputStream out) {
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287 try {
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288 Transformer transformer =
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289 TransformerFactory.newInstance().newTransformer();
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290 DOMSource source = new DOMSource(document);
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291 StreamResult result = new StreamResult(out);
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292 transformer.transform(source, result);
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293 return true;
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294 }
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295 catch (TransformerConfigurationException tce) {
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296 log.error(tce.getLocalizedMessage(), tce);
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297 }
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298 catch (TransformerFactoryConfigurationError tfce) {
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299 log.error(tfce.getLocalizedMessage(), tfce);
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300 }
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301 catch (TransformerException te) {
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302 log.error(te.getLocalizedMessage(), te);
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303 }
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304
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305 return false;
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306 }
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307
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308 public static String toString(Document document) {
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309 try {
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310 Transformer transformer =
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311 TransformerFactory.newInstance().newTransformer();
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312 DOMSource source = new DOMSource(document);
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313 StringWriter out = new StringWriter();
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314 StreamResult result = new StreamResult(out);
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315 transformer.transform(source, result);
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316 out.flush();
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317 return out.toString();
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318 }
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319 catch (TransformerConfigurationException tce) {
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320 log.error(tce.getLocalizedMessage(), tce);
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321 }
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322 catch (TransformerFactoryConfigurationError tfce) {
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323 log.error(tfce.getLocalizedMessage(), tfce);
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324 }
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325 catch (TransformerException te) {
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326 log.error(te.getLocalizedMessage(), te);
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327 }
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328
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329 return null;
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330 }
4070
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331 }
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332 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org