/**
* List the {@link Dataset} URIs in the repository identified by the URI.
*
* <p>URI formats are defined by {@code Dataset} implementations. The repository URIs you pass to
* this method must begin with {@code repo:}. For example, to list the {@code Dataset} URIs for
* the Hive repository, provide the URI {@code repo:hive}.
*
* @param uri a {@code DatasetRepository} URI
* @return the URIs present in the {@code DatasetRepository}
* @throws NullPointerException if {@code uri} is null
* @throws IllegalArgumentException if {@code uri} is not a repository URI
*/
public static Collection<URI> list(URI uri) {
boolean isRepo = URIBuilder.REPO_SCHEME.equals(uri.getScheme());
Preconditions.checkArgument(isRepo, "Not a repository URI: " + uri);
DatasetRepository repo = Registration.open(URI.create(uri.getRawSchemeSpecificPart()));
// build a URI for each dataset name
URI repoUri = repo.getUri();
List<URI> datasets = Lists.newArrayList();
for (String namespace : repo.namespaces()) {
for (String dataset : repo.datasets(namespace)) {
datasets.add(new URIBuilder(repoUri, namespace, dataset).build());
}
}
return datasets;
}
