| public synchronized org.xml.sax.XMLReader | getXMLReader()Retrieves a cached XMLReader for this thread, or creates a new
XMLReader, if the existing reader is in use. When the caller no
longer needs the reader, it must release it with a call to
{@link #releaseXMLReader}.
XMLReader reader;
boolean readerInUse;
if (m_readers == null) {
// When the m_readers.get() method is called for the first time
// on a thread, a new XMLReader will automatically be created.
m_readers = new ThreadLocal();
}
if (m_inUse == null) {
m_inUse = new Hashtable();
}
// If the cached reader for this thread is in use, construct a new
// one; otherwise, return the cached reader unless it isn't an
// instance of the class set in the 'org.xml.sax.driver' property
reader = (XMLReader) m_readers.get();
boolean threadHasReader = (reader != null);
String factory = SecuritySupport.getInstance().getSystemProperty("org.xml.sax.driver");
if (!threadHasReader || m_inUse.get(reader) == Boolean.TRUE ||
!reader.getClass().getName().equals(factory)) {
try {
try {
// According to JAXP 1.2 specification, if a SAXSource
// is created using a SAX InputSource the Transformer or
// TransformerFactory creates a reader via the
// XMLReaderFactory if setXMLReader is not used
reader = XMLReaderFactory.createXMLReader();
} catch (Exception e) {
try {
// If unable to create an instance, let's try to use
// the XMLReader from JAXP
if (m_parserFactory == null) {
m_parserFactory = SAXParserFactory.newInstance();
m_parserFactory.setNamespaceAware(true);
}
reader = m_parserFactory.newSAXParser().getXMLReader();
} catch (ParserConfigurationException pce) {
throw pce; // pass along pce
}
}
try {
reader.setFeature(NAMESPACES_FEATURE, true);
reader.setFeature(NAMESPACE_PREFIXES_FEATURE, false);
} catch (SAXException se) {
// Try to carry on if we've got a parser that
// doesn't know about namespace prefixes.
}
} catch (ParserConfigurationException ex) {
throw new SAXException(ex);
} catch (FactoryConfigurationError ex1) {
throw new SAXException(ex1.toString());
} catch (NoSuchMethodError ex2) {
} catch (AbstractMethodError ame) {
}
// Cache the XMLReader if this is the first time we've created
// a reader for this thread.
if (!threadHasReader) {
m_readers.set(reader);
m_inUse.put(reader, Boolean.TRUE);
}
} else {
m_inUse.put(reader, Boolean.TRUE);
}
return reader;
|
