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comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/Builder.java @ 4737:718adea968e2

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Add <dc:variable name="variable" expr="xpath"/> construct to datacage language. Each time during traversal of the template this element is found a variable called 'variable' is set to the result of the the evaluation of the XPpath 'xpath'. Example: <dc:variable name="x" expr="$x + 1"/> <!-- Assign x+1 to x -->
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 14:05:21 +0100
parents 3a077fc360c2
children fb135e1dfa35
comparison
equal deleted inserted replaced
4736:b195fede1c3b 4737:718adea968e2
344 if (test.length() == 0) { 344 if (test.length() == 0) {
345 log.warn("missing 'test' attribute in 'if'"); 345 log.warn("missing 'test' attribute in 'if'");
346 return; 346 return;
347 } 347 }
348 348
349 Boolean result = evaluateXPath(test); 349 Boolean result = evaluateXPathToBoolean(test);
350 350
351 if (result != null && result.booleanValue()) { 351 if (result != null && result.booleanValue()) {
352 NodeList subs = current.getChildNodes(); 352 NodeList subs = current.getChildNodes();
353 for (int i = 0, N = subs.getLength(); i < N; ++i) { 353 for (int i = 0, N = subs.getLength(); i < N; ++i) {
354 build(parent, subs.item(i)); 354 build(parent, subs.item(i));
378 if (test.length() == 0) { 378 if (test.length() == 0) {
379 log.warn("no 'test' attribute found for when"); 379 log.warn("no 'test' attribute found for when");
380 continue; 380 continue;
381 } 381 }
382 382
383 Boolean result = evaluateXPath(test); 383 Boolean result = evaluateXPathToBoolean(test);
384 if (result != null && result.booleanValue()) { 384 if (result != null && result.booleanValue()) {
385 branch = child; 385 branch = child;
386 break; 386 break;
387 } 387 }
388 388
400 build(parent, subs.item(i)); 400 build(parent, subs.item(i));
401 } 401 }
402 } 402 }
403 } 403 }
404 404
405 protected Boolean evaluateXPath(String expr) { 405 protected Object evaluateXPath(String expr) {
406 406
407 if (log.isDebugEnabled()) { 407 if (log.isDebugEnabled()) {
408 log.debug("evaluate: '" + expr + "'"); 408 log.debug("evaluate: '" + expr + "'");
409 } 409 }
410 410
411 try { 411 try {
412 XPath xpath = XPATH_FACTORY.newXPath(); 412 XPath xpath = XPATH_FACTORY.newXPath();
413 xpath.setXPathVariableResolver(frames); 413 xpath.setXPathVariableResolver(frames);
414 xpath.setXPathFunctionResolver(FunctionResolver.FUNCTIONS); 414 xpath.setXPathFunctionResolver(FunctionResolver.FUNCTIONS);
415 Object result = xpath.evaluate( 415 return xpath.evaluate(expr, EVAL_DOCUMENT, XPathConstants.BOOLEAN);
416 expr, EVAL_DOCUMENT, XPathConstants.BOOLEAN);
417
418 return result instanceof Boolean
419 ? (Boolean)result
420 : null;
421 } 416 }
422 catch (XPathExpressionException xfce) { 417 catch (XPathExpressionException xfce) {
423 log.error("expression: " + expr, xfce); 418 log.error("expression: " + expr, xfce);
424 } 419 }
425 return null; 420 return null;
426 } 421 }
427 422
428 protected void convert(Node parent, Element current) { 423 protected Boolean evaluateXPathToBoolean(String expr) {
424
425 Object result = evaluateXPath(expr);
426
427 return result instanceof Boolean
428 ? (Boolean)result
429 : null;
430 }
431
432 protected void convert(Element current) {
429 433
430 String variable = expand(current.getAttribute("var")); 434 String variable = expand(current.getAttribute("var"));
431 String type = expand(current.getAttribute("type")); 435 String type = expand(current.getAttribute("type"));
432 436
433 Object [] result = new Object[1]; 437 Object [] result = new Object[1];
434 438
435 if (frames.getStore(variable, result)) { 439 if (frames.getStore(variable, result)) {
436 Object object = TypeConverter.convert(result[0], type); 440 Object object = TypeConverter.convert(result[0], type);
437 frames.put(variable.toUpperCase(), object); 441 frames.put(variable.toUpperCase(), object);
442 }
443 }
444
445 protected void variable(Element current) {
446
447 String varName = expand(current.getAttribute("name"));
448 String expr = current.getAttribute("expr");
449
450 if (varName.length() == 0 || expr.length() == 0) {
451 log.error("dc:variable 'name' or 'expr' empty.");
452 }
453 else {
454 frames.put(varName.toUpperCase(), evaluateXPath(expr));
438 } 455 }
439 } 456 }
440 457
441 protected String expand(String s) { 458 protected String expand(String s) {
442 Matcher m = CompiledStatement.VAR.matcher(s); 459 Matcher m = CompiledStatement.VAR.matcher(s);
494 elements(parent, (Element)current); 511 elements(parent, (Element)current);
495 } 512 }
496 else if ("text".equals(localName)) { 513 else if ("text".equals(localName)) {
497 text(parent, (Element)current); 514 text(parent, (Element)current);
498 } 515 }
516 else if ("variable".equals(localName)) {
517 variable((Element)current);
518 }
499 else if ("comment".equals(localName) 519 else if ("comment".equals(localName)
500 || "statement".equals(localName)) { 520 || "statement".equals(localName)) {
501 // ignore comments and statements in output 521 // ignore comments and statements in output
502 } 522 }
503 else if ("convert".equals(localName)) { 523 else if ("convert".equals(localName)) {
504 convert(parent, (Element)current); 524 convert((Element)current);
505 } 525 }
506 else { 526 else {
507 log.warn("unknown '" + localName + "' -> ignore"); 527 log.warn("unknown '" + localName + "' -> ignore");
508 } 528 }
509 } 529 }
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