Changeset 1495 for MDService2/trunk/MDService2/src/eu/clarin/cmdi/mdservice/action/MDTransformer.java
- Timestamp:
- 08/25/11 20:21:23 (13 years ago)
- File:
-
- 1 edited
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MDService2/trunk/MDService2/src/eu/clarin/cmdi/mdservice/action/MDTransformer.java
r1488 r1495 52 52 53 53 /** 54 * Helper class, encapsulating the xsl-transformations handling 55 * the contract is, that the requester passes a key, which can be resolved to a xsl-script (momentary mapped in properties: Admin.getConfig()) 56 * Bad things happen, if the key or the appropriate xsl-file do not exist 54 * Helper class, encapsulating the xsl-transformations handling. 55 * The contract is, that the requester passes a key, which can be resolved to a xsl-script (momentary mapped in properties: Admin.getConfig()) 56 * 57 * Bad things happen, if the key or the appropriate xsl-file do not exist - well the client gets a diagnostic message. 57 58 * 58 59 * … … 66 67 private HashMap<String,String> params; 67 68 68 private MDTransformer singleton; 69 // don't use singleton!! Bad things happen 70 // private MDTransformer singleton; 69 71 TransformerFactory tfactory ; 70 72 … … 73 75 } 74 76 75 /*76 public static MDTransformer getMDTransformer () {77 if (singleton == null) {78 singleton = new MDTransformer();79 }80 return singleton;81 }82 */83 77 84 78 public URL getSrcFile() { … … 90 84 } 91 85 86 /** 87 * This serves the caller (mainly GenericProxyAction.prepare()) 88 * to provide/fill the request parameters. 89 * They then get translated to stylesheet-parameters (in SetTransformerParameters()). 90 * @return 91 */ 92 92 public void setParams(HashMap<String,String> params){ 93 93 this.params = params; 94 94 } 95 95 96 96 97 public HashMap<String,String> getParams(){ 97 98 return this.params; 98 99 } 99 100 /** 100 * get the path to the transform-xsl file from properties, based on the key 101 * get the path to the transform-xsl file from properties, based on the key (aka format-parameter) 101 102 * @param key 102 103 * @return … … 116 117 } 117 118 119 /** 120 * Tries to load the stylesheet based on the key. 121 * This is done in two steps: 122 * 1. try to resolve the key to a path 123 * 2. get the xsl-file as a stream (and establish it as StreamSource) 124 * 125 * @param key The key identifying the stylesheet for the transformation as passed by GenericProxyAction. 126 * @return the stylesheet to be applied (as StreamSource) 127 * @throws NoStylesheetException If the stylesheet could not be located 128 */ 118 129 private StreamSource getXSLStreamSource (String key) throws NoStylesheetException{ 119 130 … … 126 137 StreamSource streamSource = new StreamSource(xslstream); 127 138 128 //Admin.notifyUser(this.getClass().getClassLoader().getResource(xslPath).toString());129 //Admin.notifyUser(this.getClass().getClassLoader().getResource(xslPath).getPath());130 131 132 139 streamSource.setSystemId(this.getClass().getClassLoader().getResource(xslPath).toString()); 133 return streamSource ; 134 135 } 136 137 public Object getCols() throws TransformerConfigurationException, TransformerFactoryConfigurationError{ 138 139 String xmlString = null; 140 // create new document 141 Document doc = null; 142 DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); 143 DocumentBuilder docBuilder; 144 try { 145 docBuilder = docFactory.newDocumentBuilder(); 146 doc = docBuilder.newDocument(); 147 // append root tag <col > 148 Element root = (Element) doc.createElement("root"); 149 doc.appendChild(root); 150 151 Element child1 = (Element) doc.createElement("col"); 152 child1.setTextContent("Id"); 153 root.appendChild(child1); 154 Element child = (Element) doc.createElement("col"); 155 child.setTextContent("Name"); 156 root.appendChild(child); 157 //Element child = doc.createElement("col"); 158 //child.setNodeValue("Id"); 159 160 161 Transformer transformer = TransformerFactory.newInstance().newTransformer(); 162 transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 163 164 //initialize StreamResult with File object to save to file 165 StreamResult result = new StreamResult(new StringWriter()); 166 DOMSource source = new DOMSource(doc); 167 try { 168 transformer.transform(source, result); 169 xmlString = result.getWriter().toString(); 170 171 Admin.notifyUser(xmlString); 172 } catch (TransformerException e) { 173 // TODO Auto-generated catch block 174 e.printStackTrace(); 175 } 176 177 178 179 } catch (ParserConfigurationException e) { 180 // TODO Auto-generated catch block 181 e.printStackTrace(); 182 } 183 //return xmlString; 184 //return doc.getElementsByTagName("col").item(0); 185 return doc.getDocumentElement(); 140 return streamSource ; 141 186 142 } 187 143 … … 189 145 return params.get("format"); 190 146 } 191 147 148 /** 149 * Makes the request-parameters available in the stylesheets 150 * by translating them to stylesheet-parameters 151 * @param transformer 152 */ 192 153 public void SetTransformerParameters(Transformer transformer){ 193 154 … … 231 192 me.setWriter(w); 232 193 ((net.sf.saxon.Controller)transformer).setMessageEmitter(me);//new net.sf.saxon.event.MessageWarner()); 194 233 195 234 /* transformer.setParameter("q", q);235 transformer.setParameter("lang", lang);236 transformer.setParameter("format", transkey);237 transformer.setParameter("cols", cols);238 if ((startRecord != null) && (maximumRecords != null)) {239 240 transformer.setParameter("startRecord", startRecord);241 transformer.setParameter("maximumRecords", maximumRecords);242 }243 if (repositoryURI != null) {244 245 transformer.setParameter("repository_uri", repositoryURI);246 }247 */248 /* transformer.setParameter("cols", "<col label='id'>Id</col>" +249 "<col label='id'>idno</col>" +250 "<col label='name'>Name</col>" +251 "<col label='title'>Title</col>" +252 "<col label='title'>title</col>"); */253 254 196 if (srcFile!=null) { 255 197 … … 288 230 writeXslMessages(w); 289 231 ///Admin.notifyUser(w.getBuffer().toString()); 290 } 291 232 } 233 234 235 /** 236 * just a wrapper for the main method translating the output-stream into a input-stream (expected by the Controller-Actions to return as response) 237 * @param xmlStream the source xml stream 238 * @param transkey 239 * @return result-stream (converted to InputStream) 240 * @throws IOException 241 * @throws InterruptedException 242 * @throws TransformerException 243 * @throws NoStylesheetException 244 */ 245 public InputStream transformXML ( InputStream xmlStream) throws IOException, InterruptedException, TransformerException, NoStylesheetException { 246 //public InputStream transformXML ( InputStream xmlStream, String transkey, String cols, String startRecord, String maximumRecords, String lang, String q, String repositoryURI) throws IOException, InterruptedException, TransformerException { 247 248 ByteArrayOutputStream out = new ByteArrayOutputStream(); 249 transformXML(xmlStream, out); 250 InputStream transformedStream = new ByteArrayInputStream(out.toByteArray()); 251 return transformedStream; 252 } 253 254 /** 255 * another wrapper for the main method allowing to directly pass a URL to the source-xml 256 * @param xmlFile URL of the source-file 257 * @param transkey 258 * @return the result-stream (already converted to an InputStream) 259 * @throws TransformerException 260 * @throws IOException 261 * @throws NoStylesheetException 262 */ 263 public InputStream transformXML (URL xmlFile ) throws IOException, InterruptedException, TransformerException, NoStylesheetException { 264 //public InputStream transformXML (URL xmlFile, String transkey ) throws IOException, InterruptedException, TransformerException { 265 srcFile= xmlFile; 266 InputStream xmlStream = 267 new BufferedInputStream(new FileInputStream(xmlFile.getPath())); 268 269 return transformXML ( xmlStream); 270 } 271 272 273 /** 274 * this is for xml-data present as string (primarily the query string present as XCQL). 275 * if xml in a file or a stream, use the other methods 276 * @param xml xml-data as string 277 * @param transkey 278 * @return 279 * @throws NoStylesheetException 280 * @throws IOException 281 */ 282 public String transformXML (String xml) throws NoStylesheetException { 283 //public String transformXML (String xml, String transkey ) { 284 String result=""; 285 try { 286 // Create a transform factory instance. 287 System.setProperty("javax.xml.transform.TransformerFactory", "net.sf.saxon.TransformerFactoryImpl"); 288 //System.setProperty("javax.xml.transform.TransformerFactory", "com.icl.saxon.TransformerFactoryImpl"); 289 TransformerFactory tfactory = TransformerFactory.newInstance(); 290 OutputStream os = new ByteArrayOutputStream(); 291 StreamResult stream = new StreamResult(os); 292 // Create a transformer for the stylesheet. 293 Transformer transformer = tfactory.newTransformer( 294 getXSLStreamSource(getTranskey())); 295 296 MessageEmitter me = new net.sf.saxon.event.MessageEmitter(); 297 StringWriter w = new StringWriter(); 298 me.setWriter(w); 299 ((net.sf.saxon.Controller)transformer).setMessageEmitter(me);//new net.sf.saxon.event.MessageWarner()); 300 301 // Transform the source XML to System.out. 302 StreamSource src =new StreamSource(); 303 Reader reader = new StringReader(xml); 304 src.setReader(reader); 305 306 transformer.transform(src, stream ); 307 // new StreamResult(new File("Simple2.out"))); 308 // Write <xsl:message> 309 writeXslMessages(w); 310 311 result = os.toString(); 312 313 } catch (TransformerException e) { 314 e.printStackTrace(); 315 } 316 317 return result; 318 } 319 292 320 private void writeXslMessages(StringWriter w){ 293 321 … … 304 332 e.printStackTrace(); 305 333 } 306 307 } 308 /** 309 * just a wrapper for the main method translating the output-stream into a input-stream (expected by the Controller-Actions to return as response) 310 * @param xmlStream the source xml stream 311 * @param transkey 312 * @return result-stream (converted to InputStream) 313 * @throws IOException 314 * @throws InterruptedException 315 * @throws TransformerException 316 * @throws NoStylesheetException 317 */ 318 public InputStream transformXML ( InputStream xmlStream) throws IOException, InterruptedException, TransformerException, NoStylesheetException { 319 //public InputStream transformXML ( InputStream xmlStream, String transkey, String cols, String startRecord, String maximumRecords, String lang, String q, String repositoryURI) throws IOException, InterruptedException, TransformerException { 320 321 ByteArrayOutputStream out = new ByteArrayOutputStream(); 322 transformXML(xmlStream, out); 323 //transformXML(xmlStream, transkey, cols, startRecord, maximumRecords, lang, q, repositoryURI, out); 324 InputStream transformedStream = new ByteArrayInputStream(out.toByteArray()); 325 //Admin.notifyUser("transformedStream:" + transformedStream.toString()); 326 return transformedStream; 327 } 328 329 /** 330 * just a wrapper for the main method translating the output-stream into a input-stream (expected by the Controller-Actions to return as response) 331 * @param xmlStream the source xml stream 332 * @param transkey 333 * @return result-stream (converted to InputStream) 334 * @throws IOException 335 * @throws InterruptedException 336 * @throws TransformerException 337 */ 338 /* 339 public InputStream transformXML ( InputStream xmlStream, String transkey) throws IOException, InterruptedException, TransformerException { 340 341 ByteArrayOutputStream out = new ByteArrayOutputStream(); 342 transformXML(xmlStream, transkey, "", "", "","","", "", out); 343 InputStream transformedStream = new ByteArrayInputStream(out.toByteArray()); 344 //Admin.notifyUser("transformedStream:" + transformedStream.toString()); 345 return transformedStream; 346 } 347 */ 348 /** 349 * another wrapper for the main method allowing to directly pass a URL to the source-xml 350 * @param xmlFile URL of the source-file 351 * @param transkey 352 * @return the result-stream (already converted to an InputStream) 353 * @throws TransformerException 354 * @throws IOException 355 * @throws NoStylesheetException 356 */ 357 public InputStream transformXML (URL xmlFile ) throws IOException, InterruptedException, TransformerException, NoStylesheetException { 358 //public InputStream transformXML (URL xmlFile, String transkey ) throws IOException, InterruptedException, TransformerException { 359 srcFile= xmlFile; 360 InputStream xmlStream = 361 new BufferedInputStream(new FileInputStream(xmlFile.getPath())); 362 363 return transformXML ( xmlStream); 364 } 365 366 367 /** 368 * this is for xml present as string. 369 * if xml in a file or a stream, use the other methods 370 * @param xml xml as string 371 * @param transkey 372 * @return 373 * @throws NoStylesheetException 374 * @throws IOException 375 */ 376 public String transformXML (String xml) throws NoStylesheetException { 377 //public String transformXML (String xml, String transkey ) { 378 String result=""; 379 try { 380 // Create a transform factory instance. 381 System.setProperty("javax.xml.transform.TransformerFactory", "net.sf.saxon.TransformerFactoryImpl"); 382 //System.setProperty("javax.xml.transform.TransformerFactory", "com.icl.saxon.TransformerFactoryImpl"); 383 TransformerFactory tfactory = TransformerFactory.newInstance(); 384 OutputStream os = new ByteArrayOutputStream(); 385 StreamResult stream = new StreamResult(os); 386 // Create a transformer for the stylesheet. 387 Transformer transformer = tfactory.newTransformer( 388 getXSLStreamSource(getTranskey())); 389 /* instead of: 390 InputStream xslIS = 391 new BufferedInputStream(new FileInputStream(getXSLPath(transkey))); 392 393 Transformer transformer = 394 tfactory.newTransformer(new StreamSource(xslIS)); 395 */ 396 //////////////////// 397 MessageEmitter me = new net.sf.saxon.event.MessageEmitter(); 398 StringWriter w = new StringWriter(); 399 me.setWriter(w); 400 ((net.sf.saxon.Controller)transformer).setMessageEmitter(me);//new net.sf.saxon.event.MessageWarner()); 401 402 // Transform the source XML to System.out. 403 StreamSource src =new StreamSource(); 404 Reader reader = new StringReader(xml); 405 src.setReader(reader); 406 407 transformer.transform(src, stream ); 408 // new StreamResult(new File("Simple2.out"))); 409 // Write <xsl:message> 410 writeXslMessages(w); 411 412 result = os.toString(); 413 414 } catch (TransformerException e) { 415 e.printStackTrace(); 416 } 417 418 return result; 419 } 420 334 } 421 335 422 336 public static HashMap<String,String> createParamsMap(String transkey){
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