/**
* Return whether the given string contains well-formed XML.
*
* @param xmlString string to check
* @return true iif the given string contains well-formed XML
*/
public static boolean isWellFormedXML(String xmlString) {
// Empty string is never well-formed XML
if (xmlString.trim().length() == 0) return false;
try {
final XMLReader xmlReader = newSAXParser(XMLUtils.ParserConfiguration.PLAIN).getXMLReader();
xmlReader.setContentHandler(NULL_CONTENT_HANDLER);
xmlReader.setEntityResolver(ENTITY_RESOLVER);
xmlReader.setErrorHandler(
new org.xml.sax.ErrorHandler() {
public void error(SAXParseException exception) throws SAXException {
throw exception;
}
public void fatalError(SAXParseException exception) throws SAXException {
throw exception;
}
public void warning(SAXParseException exception) throws SAXException {}
});
xmlReader.parse(new InputSource(new StringReader(xmlString)));
return true;
} catch (Exception e) {
// Ideally we would like the parser to not throw as this is time-consuming, but not sure how
// to achieve that
return false;
}
}
public static XMLReader newXMLReader(XMLUtils.ParserConfiguration parserConfiguration) {
final SAXParser saxParser = XMLUtils.newSAXParser(parserConfiguration);
try {
final XMLReader xmlReader = saxParser.getXMLReader();
xmlReader.setEntityResolver(XMLUtils.ENTITY_RESOLVER);
xmlReader.setErrorHandler(XMLUtils.ERROR_HANDLER);
return xmlReader;
} catch (Exception e) {
throw new OXFException(e);
}
}
/**
* This will create a SAX XMLReader capable of parsing a DTD and configure it so that the DTD
* parsing events are routed to the handlers registered onto this SAXOutputter.
*
* @return <code>XMLReader</code> a SAX2 parser.
* @throws JDOMException if no parser can be created.
*/
private XMLReader createDTDParser() throws JDOMException {
XMLReader parser = null;
// Get a parser instance
try {
parser = createParser();
} catch (Exception ex1) {
throw new JDOMException("Error in SAX parser allocation", ex1);
}
// Register handlers
if (this.getDTDHandler() != null) {
parser.setDTDHandler(this.getDTDHandler());
}
if (this.getEntityResolver() != null) {
parser.setEntityResolver(this.getEntityResolver());
}
if (this.getLexicalHandler() != null) {
try {
parser.setProperty(SAX_PROPERTY_LEXICAL_HANDLER, this.getLexicalHandler());
} catch (SAXException ex1) {
try {
parser.setProperty(SAX_PROPERTY_LEXICAL_HANDLER_ALT, this.getLexicalHandler());
} catch (SAXException ex2) {
// Forget it!
}
}
}
if (this.getDeclHandler() != null) {
try {
parser.setProperty(SAX_PROPERTY_DECLARATION_HANDLER, this.getDeclHandler());
} catch (SAXException ex1) {
try {
parser.setProperty(SAX_PROPERTY_DECLARATION_HANDLER_ALT, this.getDeclHandler());
} catch (SAXException ex2) {
// Forget it!
}
}
}
// Absorb errors as much as possible, per Laurent
parser.setErrorHandler(new DefaultHandler());
return parser;
}
private static void inputSourceToSAX(
InputSource inputSource,
XMLReceiver xmlReceiver,
XMLUtils.ParserConfiguration parserConfiguration,
boolean handleLexical) {
// Insert XInclude processor if needed
final TransformerURIResolver resolver;
if (parserConfiguration.handleXInclude) {
parserConfiguration =
new XMLUtils.ParserConfiguration(
parserConfiguration.validating,
false,
parserConfiguration.externalEntities,
parserConfiguration.uriReferences);
resolver = new TransformerURIResolver(XMLUtils.ParserConfiguration.PLAIN);
xmlReceiver =
new XIncludeReceiver(null, xmlReceiver, parserConfiguration.uriReferences, resolver);
} else {
resolver = null;
}
try {
final XMLReader xmlReader = newSAXParser(parserConfiguration).getXMLReader();
xmlReader.setContentHandler(xmlReceiver);
if (handleLexical) xmlReader.setProperty(XMLConstants.SAX_LEXICAL_HANDLER, xmlReceiver);
xmlReader.setEntityResolver(ENTITY_RESOLVER);
xmlReader.setErrorHandler(ERROR_HANDLER);
xmlReader.parse(inputSource);
} catch (SAXParseException e) {
throw new ValidationException(e.getMessage(), new LocationData(e));
} catch (Exception e) {
throw new OXFException(e);
} finally {
if (resolver != null) resolver.destroy();
}
}
