/**
* Get the first topic id.
*
* @param path file path
* @param dir file dir
* @param useCatalog whether use catalog file for validation
* @return topic id
*/
public static String getFirstTopicId(final URI path, final File dir, final boolean useCatalog) {
if (path == null && dir == null) {
return null;
}
final DITAOTLogger logger = new DITAOTJavaLogger();
final StringBuilder firstTopicId = new StringBuilder();
final TopicIdParser parser = new TopicIdParser(firstTopicId);
try {
final XMLReader reader = XMLUtils.getXMLReader();
reader.setContentHandler(parser);
if (useCatalog) {
reader.setEntityResolver(CatalogUtils.getCatalogResolver());
}
reader.parse(dir.toURI().resolve(path).toString());
} catch (final Exception e) {
logger.error(e.getMessage(), e);
}
return firstTopicId.toString();
}