public synchronized void returnParser(SAXParser parser) {
try {
if (!resetChecked) {
try {
parser.getClass().getDeclaredMethod("reset", (Class[]) null);
resetAvailable = true;
} catch (NoSuchMethodException e) {
resetAvailable = false;
}
resetChecked = true;
}
if (resetAvailable) {
parser.reset();
parsers.push(parser);
} else if (USE_INTERNAL_PARSER_IMPL) {
((XmlRpcSaxParser) parser).reset();
parsers.push(parser);
}
} catch (Exception e) {
e.printStackTrace(); // TODO log properly
}
}
private final Document parseTemplateUsingPool(
final Configuration configuration,
final String documentName,
final Reader reader,
final ResourcePool<SAXParser> poolToBeUsed) {
final SAXParser saxParser = poolToBeUsed.allocate();
final TemplatePreprocessingReader templateReader =
(reader instanceof TemplatePreprocessingReader
? (TemplatePreprocessingReader) reader
: new TemplatePreprocessingReader(reader, 8192));
try {
/*
* Parse the document
*/
final Document document = doParse(configuration, documentName, templateReader, saxParser);
if (this.canResetParsers) {
try {
/*
* Reset the parser so that it can be used again.
*/
saxParser.reset();
} catch (final UnsupportedOperationException e) {
if (this.logger.isWarnEnabled()) {
this.logger.warn(
"[THYMELEAF] The SAX Parser implementation being used (\"{}\") does not implement "
+ "the \"reset\" operation. This will force Thymeleaf to re-create parser instances "
+ "each time they are needed for parsing templates, which is more costly. Enabling template "
+ "cache is recommended, and also using a parser library which implements \"reset\" such as "
+ "xerces version 2.9.1 or newer.",
saxParser.getClass().getName());
}
this.canResetParsers = false;
}
}
return document;
} catch (final IOException e) {
throw new TemplateInputException("Exception parsing document", e);
} catch (final TemplateProcessingException e) {
throw e;
} catch (final SAXParseException e) {
final String message =
String.format(
"Exception parsing document: template=\"%s\", line %d - column %d",
documentName,
Integer.valueOf(e.getLineNumber()),
Integer.valueOf(e.getColumnNumber()));
throw new TemplateInputException(message, e);
} catch (final SAXException e) {
throw new TemplateInputException("Exception parsing document", e);
} finally {
if (this.canResetParsers) {
poolToBeUsed.release(saxParser);
} else {
poolToBeUsed.discardAndReplace(saxParser);
}
}
}