@Override
public synchronized boolean updateIfChanged(String identifier)
throws IOException, RegistryException {
// identify installed vocabulary by identifier
Vocabulary installed = get(identifier);
if (installed != null) {
// match vocabulary by identifier and issued date
Vocabulary matched = null;
for (Vocabulary v : registryManager.getVocabularies()) {
if (v.getUriString() != null
&& v.getUriString().equalsIgnoreCase(identifier)
&& installed.getIssued() != null
&& v.getIssued() != null
&& installed.getIssued().compareTo(v.getIssued()) == 0) {
matched = v;
break;
}
}
// verify the version was updated
if (matched != null && matched.getUriResolvable() != null) {
File vocabFile = getVocabFile(matched.getUriResolvable());
return downloader.downloadIfChanged(matched.getUriResolvable().toURL(), vocabFile);
}
}
return false;
}
