/**
* This creates an empty <code>Document</code> object based on a specific parser implementation.
*
* @return <code>Document</code> - created DOM Document.
* @throws JDOMException when errors occur.
*/
public Document createDocument() throws JDOMException {
try {
return (Document) Class.forName("org.apache.xerces.dom.DocumentImpl").newInstance();
} catch (Exception e) {
throw new JDOMException(
e.getClass().getName() + ": " + e.getMessage() + " when creating document", e);
}
}
/**
* This creates a new <code>{@link Document}</code> from an existing <code>InputStream</code> by
* letting a DOM parser handle parsing using the supplied stream.
*
* @param in <code>InputStream</code> to parse.
* @param validate <code>boolean</code> to indicate if validation should occur.
* @return <code>Document</code> - instance ready for use.
* @throws IOException when I/O error occurs.
* @throws JDOMException when errors occur in parsing.
*/
public Document getDocument(InputStream in, boolean validate) throws IOException, JDOMException {
try {
// Load the parser class
Class parserClass = Class.forName("org.apache.xerces.parsers.DOMParser");
Object parser = parserClass.newInstance();
// Set validation
Method setFeature =
parserClass.getMethod("setFeature", new Class[] {java.lang.String.class, boolean.class});
setFeature.invoke(
parser, new Object[] {"http://xml.org/sax/features/validation", new Boolean(validate)});
// Set namespaces true
setFeature.invoke(
parser, new Object[] {"http://xml.org/sax/features/namespaces", new Boolean(true)});
// Set the error handler
if (validate) {
Method setErrorHandler =
parserClass.getMethod("setErrorHandler", new Class[] {ErrorHandler.class});
setErrorHandler.invoke(parser, new Object[] {new BuilderErrorHandler()});
}
// Parse the document
Method parse = parserClass.getMethod("parse", new Class[] {org.xml.sax.InputSource.class});
parse.invoke(parser, new Object[] {new InputSource(in)});
// Get the Document object
Method getDocument = parserClass.getMethod("getDocument", null);
Document doc = (Document) getDocument.invoke(parser, null);
return doc;
} catch (InvocationTargetException e) {
Throwable targetException = e.getTargetException();
if (targetException instanceof org.xml.sax.SAXParseException) {
SAXParseException parseException = (SAXParseException) targetException;
throw new JDOMException(
"Error on line "
+ parseException.getLineNumber()
+ " of XML document: "
+ parseException.getMessage(),
e);
} else if (targetException instanceof IOException) {
IOException ioException = (IOException) targetException;
throw ioException;
} else {
throw new JDOMException(targetException.getMessage(), e);
}
} catch (Exception e) {
throw new JDOMException(e.getClass().getName() + ": " + e.getMessage(), e);
}
}