/**
* Returns the URI mapping in the catalog for the given URI reference or <code>null</code> if no
* mapping exists. URI comparison is case sensitive. If the URI reference is an URN in the <code>
* publicid</code> namespace it is converted into a public identifier by URN "unwrapping" as
* specified in the XML Catalogs specification and then resolution is performed following the
* semantics of external identifier resolution.
*
* @param uri the URI to locate in the catalog
* @return the mapped URI or <code>null</code> if no mapping was found in the catalog
* @throws IOException if an i/o error occurred while reading the catalog
*/
public final synchronized String resolveURI(String uri) throws IOException {
if (fCatalogsChanged) {
parseCatalogs();
fCatalogsChanged = false;
}
return (fCatalog != null) ? fCatalog.resolveURI(uri) : null;
}
/**
* Returns the URI mapping in the catalog for the given external identifier or <code>null</code>
* if no mapping exists. If the system identifier is an URN in the <code>publicid</code> namespace
* it is converted into a public identifier by URN "unwrapping" as specified in the XML Catalogs
* specification.
*
* @param systemId the system identifier to locate in the catalog
* @return the mapped URI or <code>null</code> if no mapping was found in the catalog
* @throws IOException if an i/o error occurred while reading the catalog
*/
public final synchronized String resolveSystem(String systemId) throws IOException {
if (fCatalogsChanged) {
parseCatalogs();
fCatalogsChanged = false;
}
return (fCatalog != null) ? fCatalog.resolveSystem(systemId) : null;
}
/** Attaches the reader to the catalog. */
private void attachReaderToCatalog(Catalog catalog) {
SAXParserFactory spf = new SAXParserFactoryImpl();
spf.setNamespaceAware(true);
spf.setValidating(false);
SAXCatalogReader saxReader = new SAXCatalogReader(spf);
saxReader.setCatalogParser(
OASISXMLCatalogReader.namespaceName,
"catalog",
"com.sun.org.apache.xml.internal.resolver.readers.OASISXMLCatalogReader");
catalog.addReader("application/xml", saxReader);
}
/**
* Instruct the <code>Catalog</code> to parse each of the catalogs in the list. Only the first
* catalog will actually be parsed immediately. The others will be queued and read if they are
* needed later.
*/
private void parseCatalogs() throws IOException {
if (fCatalogsList != null) {
fCatalog = new Catalog(fResolverCatalogManager);
attachReaderToCatalog(fCatalog);
for (int i = 0; i < fCatalogsList.length; ++i) {
String catalog = fCatalogsList[i];
if (catalog != null && catalog.length() > 0) {
fCatalog.parseCatalog(catalog);
}
}
} else {
fCatalog = null;
}
}
/**
* Read a catalog from an input stream.
*
* <p>This class reads a catalog from an input stream:
*
* <ul>
* <li>Based on the QName of the root element, it determines which parser to instantiate for
* this catalog.
* <li>It constructs a DOM Document from the catalog and
* <li>For each child of the root node, it calls the parser's parseCatalogEntry method. This
* method is expected to make appropriate calls back into the catalog to add entries for the
* entries in the catalog. It is free to do this in whatever manner is appropriate (perhaps
* using just the node passed in, perhaps wandering arbitrarily throughout the tree).
* </ul>
*
* @param catalog The catalog for which this reader is called.
* @param is The input stream that is to be read.
* @throws IOException if the URL cannot be read.
* @throws UnknownCatalogFormatException if the catalog format is not recognized.
* @throws UnparseableCatalogException if the catalog cannot be parsed. (For example, if it is
* supposed to be XML and isn't well-formed or if the parser class cannot be instantiated.)
*/
public void readCatalog(Catalog catalog, InputStream is) throws IOException, CatalogException {
DocumentBuilderFactory factory = null;
DocumentBuilder builder = null;
factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(false);
factory.setValidating(false);
try {
builder = factory.newDocumentBuilder();
} catch (ParserConfigurationException pce) {
throw new CatalogException(CatalogException.UNPARSEABLE);
}
Document doc = null;
try {
doc = builder.parse(is);
} catch (SAXException se) {
throw new CatalogException(CatalogException.UNKNOWN_FORMAT);
}
Element root = doc.getDocumentElement();
String namespaceURI = Namespaces.getNamespaceURI(root);
String localName = Namespaces.getLocalName(root);
String domParserClass = getCatalogParser(namespaceURI, localName);
if (domParserClass == null) {
if (namespaceURI == null) {
catalog.getCatalogManager().debug.message(1, "No Catalog parser for " + localName);
} else {
catalog
.getCatalogManager()
.debug
.message(1, "No Catalog parser for " + "{" + namespaceURI + "}" + localName);
}
return;
}
DOMCatalogParser domParser = null;
try {
domParser = (DOMCatalogParser) Class.forName(domParserClass).newInstance();
} catch (ClassNotFoundException cnfe) {
catalog
.getCatalogManager()
.debug
.message(1, "Cannot load XML Catalog Parser class", domParserClass);
throw new CatalogException(CatalogException.UNPARSEABLE);
} catch (InstantiationException ie) {
catalog
.getCatalogManager()
.debug
.message(1, "Cannot instantiate XML Catalog Parser class", domParserClass);
throw new CatalogException(CatalogException.UNPARSEABLE);
} catch (IllegalAccessException iae) {
catalog
.getCatalogManager()
.debug
.message(1, "Cannot access XML Catalog Parser class", domParserClass);
throw new CatalogException(CatalogException.UNPARSEABLE);
} catch (ClassCastException cce) {
catalog
.getCatalogManager()
.debug
.message(1, "Cannot cast XML Catalog Parser class", domParserClass);
throw new CatalogException(CatalogException.UNPARSEABLE);
}
Node node = root.getFirstChild();
while (node != null) {
domParser.parseCatalogEntry(catalog, node);
node = node.getNextSibling();
}
}