1 | package eu.clarin.cmdi.mdservice.action; |
---|
2 | |
---|
3 | import java.io.*; |
---|
4 | import java.net.MalformedURLException; |
---|
5 | import java.net.URL; |
---|
6 | /*import java.io.BufferedWriter; |
---|
7 | import java.io.File; |
---|
8 | import java.io.FileInputStream; |
---|
9 | import java.io.FileNotFoundException; |
---|
10 | import java.io.FileReader; |
---|
11 | import java.io.FileWriter; |
---|
12 | import java.io.IOException; |
---|
13 | import java.io.InputStream; |
---|
14 | import java.io.Writer; |
---|
15 | */ |
---|
16 | import java.util.Date; |
---|
17 | import java.text.DateFormat; |
---|
18 | import java.text.SimpleDateFormat; |
---|
19 | import java.util.Calendar; |
---|
20 | |
---|
21 | import javax.xml.*; |
---|
22 | import javax.xml.parsers.*; |
---|
23 | import javax.xml.transform.*; |
---|
24 | import javax.xml.transform.sax.*; |
---|
25 | import javax.xml.transform.stream.*;import javax.xml.transform.dom.*; |
---|
26 | import javax.xml.xpath.*; |
---|
27 | |
---|
28 | import org.w3c.dom.*; |
---|
29 | import org.xml.sax.SAXException; |
---|
30 | import org.xml.sax.InputSource; |
---|
31 | import org.apache.commons.lang.StringEscapeUtils; |
---|
32 | |
---|
33 | |
---|
34 | import eu.clarin.cmdi.mdservice.action.Admin; |
---|
35 | import eu.clarin.cmdi.mdservice.model.Query; |
---|
36 | |
---|
37 | /** |
---|
38 | * This is a rudimentary caching mechanism. |
---|
39 | * serializes the inputstream to a file (identifier => filename) |
---|
40 | * and returns the inpustream based on the identifier |
---|
41 | * @author master |
---|
42 | * |
---|
43 | */ |
---|
44 | /* TODO: necessary to maintain own index |
---|
45 | * for resolution of IDs to filenames |
---|
46 | */ |
---|
47 | |
---|
48 | |
---|
49 | public class Cache { |
---|
50 | public static String PREFIX = "xc_"; |
---|
51 | |
---|
52 | public static String USE = "use"; |
---|
53 | public static String REFRESH = "refresh"; |
---|
54 | public static String SKIP= "skip"; |
---|
55 | |
---|
56 | private static Cache singleton; |
---|
57 | private String cachepath; |
---|
58 | private String cacheindex_path; |
---|
59 | private static Integer cachecounter; |
---|
60 | private static final Integer start_cache = 1; |
---|
61 | |
---|
62 | private static Document cacheindex_doc; |
---|
63 | |
---|
64 | |
---|
65 | public Cache () { |
---|
66 | cachepath = Admin.getConfig().getProperty("cache.path"); |
---|
67 | cacheindex_path = cachepath + Admin.getConfig().getProperty("cacheindex.file"); |
---|
68 | cachecounter = initCachecounter(); |
---|
69 | } |
---|
70 | |
---|
71 | public static Cache getCache() { |
---|
72 | if (singleton == null) { |
---|
73 | singleton = new Cache(); |
---|
74 | } |
---|
75 | return singleton; |
---|
76 | } |
---|
77 | |
---|
78 | protected void finalize() throws Throwable { |
---|
79 | try { |
---|
80 | updateCachecounter(); |
---|
81 | } catch(Exception e) { |
---|
82 | } |
---|
83 | finally { |
---|
84 | super.finalize(); |
---|
85 | //more code can be written here as per need of application |
---|
86 | } |
---|
87 | } |
---|
88 | |
---|
89 | /** |
---|
90 | * here the external key for the data gets cache-internal counter-id assigned |
---|
91 | * which is also returned back |
---|
92 | * can be used (as shorthand instead of the (long) external key) from outside to retrieve the data. |
---|
93 | * This is primarily meant to be able to reuse the recordset-data, when reading one record. |
---|
94 | * @param id |
---|
95 | * @param instream |
---|
96 | * @return |
---|
97 | */ |
---|
98 | public String putInCache(String key_info, InputStream instream) { |
---|
99 | |
---|
100 | Admin.notifyUser("CACHE.putInCache:"+key_info); |
---|
101 | Integer c = getCounter(); |
---|
102 | String xc; |
---|
103 | |
---|
104 | |
---|
105 | //update xml_structure |
---|
106 | Element e = cacheindex_doc.createElement("f"); |
---|
107 | //Attr attr = cacheindex_doc.createAttribute("id"); |
---|
108 | //attr.setValue(c.toString()); |
---|
109 | //e.setNamedItem(attr); |
---|
110 | e.setAttribute("id", c.toString()); |
---|
111 | String[] key_array = key_info.split("//-"); |
---|
112 | |
---|
113 | e.setAttribute("type", key_array[0]); |
---|
114 | if (key_array.length > 1){ |
---|
115 | String query_str; |
---|
116 | if (key_array[0].equals("recordset")){ |
---|
117 | query_str = transformQuery(key_array[1]); |
---|
118 | } else { |
---|
119 | query_str = key_array[1]; |
---|
120 | } |
---|
121 | e.setAttribute("query", query_str); |
---|
122 | }else{ |
---|
123 | e.setAttribute("query", ""); |
---|
124 | } |
---|
125 | if (key_array.length > 2){ |
---|
126 | e.setAttribute("collection", key_array[2]); |
---|
127 | }else{ |
---|
128 | e.setAttribute("collection", ""); |
---|
129 | } |
---|
130 | if (key_array.length > 3){ |
---|
131 | e.setAttribute("squery", key_array[3]); |
---|
132 | }else{ |
---|
133 | e.setAttribute("squery", ""); |
---|
134 | } |
---|
135 | if (key_array.length > 4){ |
---|
136 | e.setAttribute("startRecord", key_array[4]); |
---|
137 | }else{ |
---|
138 | e.setAttribute("startRecord", ""); |
---|
139 | } |
---|
140 | if (key_array.length > 5){ |
---|
141 | e.setAttribute("maximumRecords", key_array[5]); |
---|
142 | }else{ |
---|
143 | e.setAttribute("maximumRecords", ""); |
---|
144 | } |
---|
145 | |
---|
146 | if (key_array.length > 6){ |
---|
147 | e.setAttribute("repository", key_array[6]); |
---|
148 | }else{ |
---|
149 | e.setAttribute("repository", ""); |
---|
150 | } |
---|
151 | if (key_array.length > 7){ |
---|
152 | e.setAttribute("maxDepth", key_array[7]); |
---|
153 | }else{ |
---|
154 | e.setAttribute("maxDepth", ""); |
---|
155 | } |
---|
156 | if (key_array.length > 8){ |
---|
157 | e.setAttribute("lang", key_array[8]); |
---|
158 | }else{ |
---|
159 | e.setAttribute("lang", ""); |
---|
160 | } |
---|
161 | |
---|
162 | DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd:hh-mm-ss"); |
---|
163 | e.setAttribute("date", dateFormat.format(new Date()).toString()); |
---|
164 | cacheindex_doc.getFirstChild().appendChild(e); |
---|
165 | |
---|
166 | // update XML-counter |
---|
167 | //Admin.writeToFile(formPath(id + xc),instream); |
---|
168 | |
---|
169 | updateCachecounter(); |
---|
170 | |
---|
171 | xc = PREFIX + key_array[0] + "_" + c.toString(); |
---|
172 | Admin.notifyUser("CACHE.putInCache.filename:" + xc + ".xml"); |
---|
173 | Admin.writeToFile(cachepath + xc + ".xml",instream); |
---|
174 | |
---|
175 | return xc; |
---|
176 | } |
---|
177 | |
---|
178 | |
---|
179 | public InputStream getFromCache(String key_info) { |
---|
180 | |
---|
181 | |
---|
182 | File f = new File (formPath(key_info)); |
---|
183 | Admin.notifyUser("CACHE.getFromCache:"+key_info); |
---|
184 | |
---|
185 | |
---|
186 | if (f.exists()) { // read from file to InputStream; |
---|
187 | Admin.notifyUser("CACHE.getFromCache.fromfile:"+f.getName()); |
---|
188 | InputStream instream; |
---|
189 | try { |
---|
190 | instream = new FileInputStream(f); |
---|
191 | |
---|
192 | return instream; |
---|
193 | } catch (FileNotFoundException e) { |
---|
194 | // TODO Auto-generated catch block |
---|
195 | e.printStackTrace(); |
---|
196 | return null; |
---|
197 | } |
---|
198 | |
---|
199 | } else { //not cached, my dear |
---|
200 | Admin.notifyUser("CACHE.getFromCache: NOT CACHED"); |
---|
201 | return null; |
---|
202 | } |
---|
203 | } |
---|
204 | |
---|
205 | private String transformQuery (String str) { |
---|
206 | String transformed; |
---|
207 | Query query; |
---|
208 | |
---|
209 | if (str == null) return ""; |
---|
210 | if (str.trim().length() == 0) return ""; |
---|
211 | |
---|
212 | // provisional hack, setting simple string to "" |
---|
213 | query = new Query("", str,"recordset",""); |
---|
214 | if (query.isStatus(Query.PARSEERROR)) { |
---|
215 | Admin.notifyUser("Cache.transformQuery.PARSEERROR:" + query.getMsg()); |
---|
216 | // pass this bad news to the client |
---|
217 | //setUserMsg(query.getMsg()); |
---|
218 | transformed = ""; |
---|
219 | } else { |
---|
220 | transformed = Query.getSimpleQueryString(str); |
---|
221 | transformed = StringEscapeUtils.escapeXml(transformed); |
---|
222 | //Admin.notifyUser("CACHE.transformQuery:"+transformed); |
---|
223 | } |
---|
224 | return transformed; |
---|
225 | } |
---|
226 | |
---|
227 | //TODO: sanitize-key |
---|
228 | public String formPath (String key_info) { |
---|
229 | String id=""; |
---|
230 | String path=""; |
---|
231 | String xpath_expr=""; |
---|
232 | |
---|
233 | String[] key_array = key_info.split("//-"); |
---|
234 | String query_str; |
---|
235 | |
---|
236 | if(key_array.length > 1){ |
---|
237 | Admin.notifyUser("formPATH- querystring:" + key_array[1]); |
---|
238 | if (key_array[0].equals("recordset")){ |
---|
239 | query_str = this.transformQuery(key_array[1]); |
---|
240 | Admin.notifyUser("formPATH- querystring-transformed:" + query_str); |
---|
241 | } |
---|
242 | else { |
---|
243 | query_str = key_array[1]; |
---|
244 | } |
---|
245 | } else { |
---|
246 | query_str = ""; |
---|
247 | } |
---|
248 | xpath_expr = "//index/f[@type='" + key_array[0] + "'"; |
---|
249 | xpath_expr = xpath_expr + " and @query='"+query_str+"'"; |
---|
250 | |
---|
251 | if (key_array.length > 2){ |
---|
252 | xpath_expr = xpath_expr + "and @collection='"+key_array[2]+"'"; |
---|
253 | }else{ |
---|
254 | xpath_expr = xpath_expr + " and @collection=''"; |
---|
255 | } |
---|
256 | if (key_array.length > 3){ |
---|
257 | xpath_expr = xpath_expr + "and @squery='"+key_array[3]+"'"; |
---|
258 | }else{ |
---|
259 | xpath_expr = xpath_expr + " and @squery=''"; |
---|
260 | } |
---|
261 | if (key_array.length > 4){ |
---|
262 | xpath_expr = xpath_expr + "and @startRecord='"+key_array[4]+"'"; |
---|
263 | }else{ |
---|
264 | xpath_expr = xpath_expr + " and @startRecord=''"; |
---|
265 | } |
---|
266 | if (key_array.length > 5){ |
---|
267 | xpath_expr = xpath_expr + "and @maximumRecords='"+key_array[5]+"'"; |
---|
268 | }else{ |
---|
269 | xpath_expr = xpath_expr + " and @maximumRecords=''"; |
---|
270 | } |
---|
271 | |
---|
272 | if (key_array.length > 6){ |
---|
273 | xpath_expr = xpath_expr + "and @repository='"+key_array[6]+"'"; |
---|
274 | }else{ |
---|
275 | xpath_expr = xpath_expr + " and @repository=''"; |
---|
276 | } |
---|
277 | if (key_array.length > 7){ |
---|
278 | xpath_expr = xpath_expr + "and @maxDepth='"+key_array[7]+"'"; |
---|
279 | }else{ |
---|
280 | xpath_expr = xpath_expr + " and @maxDepth=''"; |
---|
281 | } |
---|
282 | if (key_array.length > 8){ |
---|
283 | xpath_expr = xpath_expr + "and @lang='"+key_array[8]+"']"; |
---|
284 | }else{ |
---|
285 | xpath_expr = xpath_expr + " and @lang='']"; |
---|
286 | } |
---|
287 | |
---|
288 | //Admin.notifyUser("formPath:xpath:"+xpath_expr); |
---|
289 | //creating an XPathFactory: |
---|
290 | XPathFactory factory = XPathFactory.newInstance(); |
---|
291 | //using this factory to create an XPath object: |
---|
292 | XPath xpath = factory.newXPath(); |
---|
293 | //XPath object created compiles the XPath expression: |
---|
294 | XPathExpression expr; |
---|
295 | try { |
---|
296 | expr = xpath.compile(xpath_expr); |
---|
297 | //expression is evaluated with respect to a certain context node which is doc. |
---|
298 | Object result = expr.evaluate(cacheindex_doc, XPathConstants.NODESET); |
---|
299 | NodeList list = (NodeList) result; |
---|
300 | if (list.getLength() > 0) { |
---|
301 | id = list.item(0).getAttributes().getNamedItem("id").getNodeValue(); |
---|
302 | path = cachepath + PREFIX + key_array[0] + "_"+id + ".xml"; |
---|
303 | } else if (list.getLength() > 1){ |
---|
304 | Admin.notifyUser("formPath ERROR:!!!:multiple paths:"+key_info); |
---|
305 | |
---|
306 | } |
---|
307 | |
---|
308 | } catch (XPathExpressionException e) { |
---|
309 | // TODO Auto-generated catch block |
---|
310 | e.printStackTrace(); |
---|
311 | } |
---|
312 | |
---|
313 | return path; |
---|
314 | } |
---|
315 | |
---|
316 | public Integer getCounter () { |
---|
317 | cachecounter = cachecounter +1 ; |
---|
318 | return cachecounter; |
---|
319 | } |
---|
320 | |
---|
321 | /** |
---|
322 | * read counter-integer from file in cache |
---|
323 | * or start that file |
---|
324 | * @return |
---|
325 | */ |
---|
326 | public Integer initCachecounter() { |
---|
327 | |
---|
328 | Integer counter = start_cache; |
---|
329 | boolean init=false; |
---|
330 | String fname = cacheindex_path; |
---|
331 | File f = new File (fname); |
---|
332 | |
---|
333 | //Admin.notifyUser("initCacheCounter"); |
---|
334 | if (!f.exists()) { |
---|
335 | // create new counter document |
---|
336 | DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); |
---|
337 | DocumentBuilder docBuilder; |
---|
338 | try { |
---|
339 | docBuilder = docFactory.newDocumentBuilder(); |
---|
340 | cacheindex_doc = docBuilder.newDocument(); |
---|
341 | // append root tag <index > |
---|
342 | Element root = (Element) cacheindex_doc.createElement("index"); |
---|
343 | root.setAttribute("idcounter", "1"); |
---|
344 | cacheindex_doc.appendChild(root); |
---|
345 | writeCachecounter(counter); |
---|
346 | |
---|
347 | //Admin.notifyUser("new document"); |
---|
348 | } catch (ParserConfigurationException e) { |
---|
349 | // TODO Auto-generated catch block |
---|
350 | e.printStackTrace(); |
---|
351 | } |
---|
352 | |
---|
353 | //} catch (IOException e2) { |
---|
354 | // Admin.notifyUser("ERROR creating cache counter"); |
---|
355 | // e2.printStackTrace(); |
---|
356 | //} |
---|
357 | } |
---|
358 | else { |
---|
359 | try { |
---|
360 | |
---|
361 | DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); |
---|
362 | DocumentBuilder docBuilder; |
---|
363 | try { |
---|
364 | docBuilder = docFactory.newDocumentBuilder(); |
---|
365 | try { |
---|
366 | cacheindex_doc = docBuilder.parse(fname); |
---|
367 | } catch (SAXException e) { |
---|
368 | // TODO Auto-generated catch block |
---|
369 | |
---|
370 | e.printStackTrace(); |
---|
371 | } |
---|
372 | } catch (ParserConfigurationException e) { |
---|
373 | // TODO Auto-generated catch block |
---|
374 | e.printStackTrace(); |
---|
375 | } |
---|
376 | |
---|
377 | //read counter |
---|
378 | counter = new Integer(cacheindex_doc.getFirstChild().getAttributes().getNamedItem("idcounter").getNodeValue()); |
---|
379 | init = true; |
---|
380 | } catch (IOException ex){ |
---|
381 | //Admin.notifyUser("initCacheCounter:" + ex.toString()); |
---|
382 | ex.printStackTrace(); |
---|
383 | } |
---|
384 | } |
---|
385 | |
---|
386 | return counter; |
---|
387 | /* |
---|
388 | //use buffering, reading one line at a time |
---|
389 | //FileReader always assumes default encoding is OK! |
---|
390 | BufferedReader input = new BufferedReader(new FileReader(f)); |
---|
391 | try { |
---|
392 | String line = null; //not declared within while loop |
---|
393 | /* |
---|
394 | * readLine is a bit quirky : |
---|
395 | * it returns the content of a line MINUS the newline. |
---|
396 | * it returns null only for the END of the stream. |
---|
397 | * it returns an empty String if two newlines appear in a row. |
---|
398 | * |
---|
399 | try { |
---|
400 | if (( line = input.readLine()) != null){ |
---|
401 | try { |
---|
402 | counter = new Integer(line); |
---|
403 | } catch (NumberFormatException e) { |
---|
404 | // if not a number, write a number |
---|
405 | init=true; |
---|
406 | } |
---|
407 | } else { |
---|
408 | init=true; |
---|
409 | } |
---|
410 | } catch (IOException e) { |
---|
411 | init=true; |
---|
412 | } |
---|
413 | |
---|
414 | if (init) { |
---|
415 | writeCachecounter( start_cache); |
---|
416 | } |
---|
417 | |
---|
418 | } finally { |
---|
419 | input.close(); |
---|
420 | } |
---|
421 | */ |
---|
422 | } |
---|
423 | |
---|
424 | public void updateCachecounter () { |
---|
425 | //Admin.notifyUser("CACHEcounter:" + cachecounter); |
---|
426 | writeCachecounter( cachecounter); |
---|
427 | } |
---|
428 | public void writeCachecounter (Integer i) { |
---|
429 | |
---|
430 | // first update <index idcounter> |
---|
431 | cacheindex_doc.getFirstChild().getAttributes().getNamedItem("idcounter").setNodeValue(i.toString()); |
---|
432 | |
---|
433 | //Admin.notifyUser("writeCacheCounter:" + i.toString()); |
---|
434 | // write xml |
---|
435 | Transformer transformer; |
---|
436 | try { |
---|
437 | transformer = TransformerFactory.newInstance().newTransformer(); |
---|
438 | transformer.setOutputProperty(OutputKeys.INDENT, "yes"); |
---|
439 | |
---|
440 | //initialize StreamResult with File object to save to file |
---|
441 | StreamResult result = new StreamResult(new StringWriter()); |
---|
442 | DOMSource source = new DOMSource(cacheindex_doc); |
---|
443 | try { |
---|
444 | transformer.transform(source, result); |
---|
445 | } catch (TransformerException e1) { |
---|
446 | // TODO Auto-generated catch block |
---|
447 | e1.printStackTrace(); |
---|
448 | } |
---|
449 | |
---|
450 | String xmlString = result.getWriter().toString(); |
---|
451 | //Admin.notifyUser("writeCacheCounter:" + xmlString); |
---|
452 | //Admin.writeToFile("", result); |
---|
453 | |
---|
454 | |
---|
455 | File f = new File (cacheindex_path); |
---|
456 | FileWriter fw; |
---|
457 | try { |
---|
458 | fw = new FileWriter(f); |
---|
459 | try { |
---|
460 | fw.write(xmlString); |
---|
461 | fw.close(); |
---|
462 | } catch (IOException e) { |
---|
463 | // TODO Auto-generated catch block |
---|
464 | e.printStackTrace(); |
---|
465 | } |
---|
466 | } catch (IOException e) { |
---|
467 | // TODO Auto-generated catch block |
---|
468 | e.printStackTrace(); |
---|
469 | } |
---|
470 | } catch (TransformerConfigurationException e2) { |
---|
471 | // TODO Auto-generated catch block |
---|
472 | e2.printStackTrace(); |
---|
473 | } catch (TransformerFactoryConfigurationError e2) { |
---|
474 | // TODO Auto-generated catch block |
---|
475 | e2.printStackTrace(); |
---|
476 | } |
---|
477 | |
---|
478 | |
---|
479 | |
---|
480 | /* |
---|
481 | File f = new File (Admin.getConfig().getProperty("cache.path") + "counter.txt"); |
---|
482 | |
---|
483 | try { |
---|
484 | Writer output = new BufferedWriter(new FileWriter(f)); |
---|
485 | //FileWriter always assumes default encoding is OK! |
---|
486 | try { |
---|
487 | output.write( i); |
---|
488 | } finally { |
---|
489 | output.close(); |
---|
490 | } |
---|
491 | } catch (IOException e) { |
---|
492 | // TODO Auto-generated catch block |
---|
493 | e.printStackTrace(); |
---|
494 | } |
---|
495 | */ |
---|
496 | } |
---|
497 | } |
---|