private Sequence processQuery(String select) throws SAXException {
XQueryContext context = null;
try {
context = new XQueryContext(broker.getBrokerPool(), accessCtx);
context.setStaticallyKnownDocuments(documentSet);
Map.Entry<String, String> namespaceEntry;
for (final Iterator<Map.Entry<String, String>> i = namespaces.entrySet().iterator();
i.hasNext(); ) {
namespaceEntry = (Map.Entry<String, String>) i.next();
context.declareNamespace(namespaceEntry.getKey(), namespaceEntry.getValue());
}
Map.Entry<String, Object> entry;
for (final Iterator<Map.Entry<String, Object>> i = variables.entrySet().iterator();
i.hasNext(); ) {
entry = (Map.Entry<String, Object>) i.next();
context.declareVariable(entry.getKey().toString(), entry.getValue());
}
// TODO(pkaminsk2): why replicate XQuery.compile here?
final XQueryLexer lexer = new XQueryLexer(context, new StringReader(select));
final XQueryParser parser = new XQueryParser(lexer);
final XQueryTreeParser treeParser = new XQueryTreeParser(context);
parser.xpath();
if (parser.foundErrors()) {
throw new SAXException(parser.getErrorMessage());
}
final AST ast = parser.getAST();
if (LOG.isDebugEnabled()) {
LOG.debug("generated AST: " + ast.toStringTree());
}
final PathExpr expr = new PathExpr(context);
treeParser.xpath(ast, expr);
if (treeParser.foundErrors()) {
throw new SAXException(treeParser.getErrorMessage());
}
expr.analyze(new AnalyzeContextInfo());
final Sequence seq = expr.eval(null, null);
return seq;
} catch (final RecognitionException e) {
LOG.warn("error while creating variable", e);
throw new SAXException(e);
} catch (final TokenStreamException e) {
LOG.warn("error while creating variable", e);
throw new SAXException(e);
} catch (final XPathException e) {
throw new SAXException(e);
} finally {
if (context != null) {
context.reset(false);
}
}
}
public static void parse(XQueryContext context, String pattern, XSLPathExpr content)
throws XPathException {
boolean xpointer = false;
// TODO: rewrite RootNode?
if (pattern.equals("//")) {
content.add(new LocationStep(context, Constants.SELF_AXIS, new AnyNodeTest()));
return;
}
if (pattern.equals("/")) {
content.add(new LocationStep(context, Constants.SELF_AXIS, new AnyNodeTest()));
return;
}
Source source = new StringSource(pattern);
Reader reader;
try {
reader = source.getReader();
} catch (IOException e1) {
return; // TODO: report error???
}
long start = System.currentTimeMillis();
XQueryLexer lexer = new XQueryLexer(context, reader);
XQueryParser parser = new XQueryParser(lexer);
XQueryTreeParser treeParser = new XQueryTreeParser(context);
try {
if (xpointer) parser.xpointer();
else parser.xpath();
if (parser.foundErrors()) {
LOG.debug(parser.getErrorMessage());
throw new StaticXQueryException(parser.getErrorMessage());
}
AST ast = parser.getAST();
if (ast == null)
throw new XPathException(
"Unknown XQuery parser error: the parser returned an empty syntax tree.");
PathExpr expr = new PathExpr(context);
if (xpointer) treeParser.xpointer(ast, expr);
else treeParser.xpath(ast, expr);
if (treeParser.foundErrors()) {
throw new StaticXQueryException(
treeParser.getErrorMessage(), treeParser.getLastException());
}
expr.analyze(new AnalyzeContextInfo(context));
// if (context.optimizationsEnabled()) {
// Optimizer optimizer = new Optimizer(context);
// expr.accept(optimizer);
// if (optimizer.hasOptimized()) {
// context.reset(true);
// expr.resetState(true);
// expr.analyze(new AnalyzeContextInfo());
// }
// }
// Log the query if it is not too large, but avoid
// dumping huge queries to the log
if (context.getExpressionCount() < 150) {
LOG.debug("Query diagnostics:\n" + ExpressionDumper.dump(expr));
} else {
LOG.debug("Query diagnostics:\n" + "[skipped: more than 150 expressions]");
}
if (LOG.isDebugEnabled()) {
NumberFormat nf = NumberFormat.getNumberInstance();
LOG.debug("Compilation took " + nf.format(System.currentTimeMillis() - start) + " ms");
}
// return
content.add(expr);
} catch (RecognitionException e) {
LOG.debug("Error compiling query: " + e.getMessage(), e);
String msg = e.getMessage();
if (msg.endsWith(", found 'null'"))
msg = msg.substring(0, msg.length() - ", found 'null'".length());
throw new StaticXQueryException(e.getLine(), e.getColumn(), msg);
} catch (TokenStreamException e) {
LOG.debug("Error compiling query: " + e.getMessage(), e);
throw new StaticXQueryException(e.getMessage(), e);
}
}
