annotate flys-aft/src/main/java/de/intevation/utils/XML.java @ 4324:4980659b2f22

Add gauge name to the measurement station xml response The reference gauge should be displayed in the measurement station info panel. Therefore the artifact service must return the name of the gauge.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 30 Oct 2012 12:49:17 +0100
parents da9df3641578
children b195fede1c3b
rev   line source
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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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parents:
diff changeset
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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diff changeset
215 */
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diff changeset
216 public static final Object xpath(
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diff changeset
217 Object root,
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parents:
diff changeset
218 String query,
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parents:
diff changeset
219 QName returnType,
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diff changeset
220 NamespaceContext namespaceContext
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221 ) {
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diff changeset
222 return xpath(root, query, returnType, namespaceContext, null);
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223 }
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parents:
diff changeset
224
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diff changeset
225 public static final Object xpath(
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parents:
diff changeset
226 Object root,
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parents:
diff changeset
227 String query,
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parents:
diff changeset
228 QName returnType,
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parents:
diff changeset
229 NamespaceContext namespaceContext,
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parents:
diff changeset
230 Map<String, String> variables)
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parents:
diff changeset
231 {
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parents:
diff changeset
232 if (root == null) {
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parents:
diff changeset
233 return null;
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parents:
diff changeset
234 }
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parents:
diff changeset
235
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parents:
diff changeset
236 XPathVariableResolver resolver = variables != null
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
237 ? new MapXPathVariableResolver(variables)
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parents:
diff changeset
238 : null;
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parents:
diff changeset
239
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parents:
diff changeset
240 try {
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parents:
diff changeset
241 XPath xpath = newXPath(namespaceContext, resolver);
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parents:
diff changeset
242 if (xpath != null) {
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parents:
diff changeset
243 return xpath.evaluate(query, root, returnType);
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parents:
diff changeset
244 }
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parents:
diff changeset
245 }
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parents:
diff changeset
246 catch (XPathExpressionException xpee) {
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parents:
diff changeset
247 log.error(xpee.getLocalizedMessage(), xpee);
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parents:
diff changeset
248 }
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diff changeset
249
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diff changeset
250 return null;
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parents:
diff changeset
251 }
4083
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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diff changeset
252
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parents: 4072
diff changeset
253 public static Document transform(
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diff changeset
254 Document document,
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parents: 4072
diff changeset
255 File xformFile
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parents: 4072
diff changeset
256 ) {
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parents: 4072
diff changeset
257 try {
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parents: 4072
diff changeset
258 Transformer transformer =
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parents: 4072
diff changeset
259 TransformerFactory
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parents: 4072
diff changeset
260 .newInstance()
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parents: 4072
diff changeset
261 .newTransformer(
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
262 new StreamSource(xformFile));
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diff changeset
263
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
264 DOMResult result = new DOMResult();
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
265
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
266 transformer.transform(new DOMSource(document), result);
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diff changeset
267
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
268 return (Document)result.getNode();
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parents: 4072
diff changeset
269 }
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parents: 4072
diff changeset
270 catch (TransformerConfigurationException tce) {
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
271 log.error(tce, tce);
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parents: 4072
diff changeset
272 }
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
273 catch (TransformerException te) {
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
diff changeset
274 log.error(te, te);
44dc38ca8492 Added an optional XSL transformation to fix the raw DIPS files.
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parents: 4072
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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 }
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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