/**
* SAX ContentHandler API.
*
* <p>Detect and use the oasis-xml-catalog PI if it occurs.
*/
public void processingInstruction(String target, String pidata) throws SAXException {
if (target.equals("oasis-xml-catalog")) {
URL catalog = null;
String data = pidata;
int pos = data.indexOf("catalog=");
if (pos >= 0) {
data = data.substring(pos + 8);
if (data.length() > 1) {
String quote = data.substring(0, 1);
data = data.substring(1);
pos = data.indexOf(quote);
if (pos >= 0) {
data = data.substring(0, pos);
try {
if (baseURL != null) {
catalog = new URL(baseURL, data);
} else {
catalog = new URL(data);
}
} catch (MalformedURLException mue) {
// nevermind
}
}
}
}
if (allowXMLCatalogPI) {
if (catalogManager.getAllowOasisXMLCatalogPI()) {
catalogManager.debug.message(4, "oasis-xml-catalog PI", pidata);
if (catalog != null) {
try {
catalogManager.debug.message(4, "oasis-xml-catalog", catalog.toString());
oasisXMLCatalogPI = true;
if (piCatalogResolver == null) {
piCatalogResolver = new CatalogResolver(true);
}
piCatalogResolver.getCatalog().parseCatalog(catalog.toString());
} catch (Exception e) {
catalogManager.debug.message(
3, "Exception parsing oasis-xml-catalog: " + catalog.toString());
}
} else {
catalogManager.debug.message(3, "PI oasis-xml-catalog unparseable: " + pidata);
}
} else {
catalogManager.debug.message(4, "PI oasis-xml-catalog ignored: " + pidata);
}
} else {
catalogManager.debug.message(
3, "PI oasis-xml-catalog occurred in an invalid place: " + pidata);
}
} else {
super.processingInstruction(target, pidata);
}
}
/**
* Implements the <code>resolveEntity</code> method for the SAX interface, using an underlying
* CatalogResolver to do the real work.
*/
public InputSource resolveEntity(String publicId, String systemId) {
allowXMLCatalogPI = false;
String resolved = catalogResolver.getResolvedEntity(publicId, systemId);
if (resolved == null && piCatalogResolver != null) {
resolved = piCatalogResolver.getResolvedEntity(publicId, systemId);
}
if (resolved != null) {
try {
InputSource iSource = new InputSource(resolved);
iSource.setPublicId(publicId);
// Ideally this method would not attempt to open the
// InputStream, but there is a bug (in Xerces, at least)
// that causes the parser to mistakenly open the wrong
// system identifier if the returned InputSource does
// not have a byteStream.
//
// It could be argued that we still shouldn't do this here,
// but since the purpose of calling the entityResolver is
// almost certainly to open the input stream, it seems to
// do little harm.
//
URL url = new URL(resolved);
InputStream iStream = url.openStream();
iSource.setByteStream(iStream);
return iSource;
} catch (Exception e) {
catalogManager.debug.message(1, "Failed to create InputSource", resolved);
return null;
}
} else {
return null;
}
}
/** Provide accessto the underlying Catalog. */
public Catalog getCatalog() {
return catalogResolver.getCatalog();
}